网络技能大赛A卷测试

  这个测试对我来言有些难度，短时间内做不了太多。首先是思路的理清，登录后的界面有好几种，而且公文的状态也有好几种。理清思路就花了一些时间

然后大致的框架做了做，然后将用户的增删改查还有公文的增删改查写了写。登录界面也完成了，不过不同角色登陆后的界面还没来得及做。主要就是功能太多，运用不熟练

数据库

 

 

 bean层的基本信息

package com.bean;
public class User {
    private int id;
    private String username;
    private String password;
    private int permissionId;
    private int status;
    public int getStatus() {
        return status;
    }
    public void setStatus(int status) {
        this.status = status;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    private String job;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    public int getPermissionId() {
        return permissionId;
    }
    public void setPermissionId(int permissionId) {
        this.permissionId = permissionId;
    }
    public String getJob() {
        return job;
    }
    public void setJob(String job) {
        this.job = job;
    }
    
}

package com.bean;

public class Permission {
    private int id;
    private int permission;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getPermission() {
        return permission;
    }
    public void setPermission(int permission) {
        this.permission = permission;
    }
}

package com.bean;

public class Doc {


    private int id;
    private String tipplace;
    private String ftipplace;
    private int deletestatus;
    private int callback;
    public int getCallback() {
        return callback;
    }
    public void setCallback(int callback) {
        this.callback = callback;
    }
    public int getDeletestatus() {
        return deletestatus;
    }
    public void setDeletestatus(int deletestatus) {
        this.deletestatus = deletestatus;
    }
    public String getFtipplace() {
        return ftipplace;
    }
    public void setFtipplace(String ftipplace) {
        this.ftipplace = ftipplace;
    }
    public String getTipplace() {
        return tipplace;
    }
    public void setTipplace(String tipplace) {
        this.tipplace = tipplace;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    private String title;
    private String owner;
    private String time;
    private String receiver;
    private int status;
    private int result;
    private String place;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getOwner() {
        return owner;
    }
    public void setOwner(String owner) {
        this.owner = owner;
    }
    public String getTime() {
        return time;
    }
    public void setTime(String time) {
        this.time = time;
    }
    public String getReceiver() {
        return receiver;
    }
    public void setReceiver(String receiver) {
        this.receiver = receiver;
    }
    public int getStatus() {
        return status;
    }
    public void setStatus(int status) {
        this.status = status;
    }
    public int getResult() {
        return result;
    }
    public void setResult(int result) {
        this.result = result;
    }
    public String getPlace() {
        return place;
    }
    public void setPlace(String place) {
        this.place = place;
    }
}

然后是连接数据库

package com.dao;

import java.sql.*;

public class DBDao {  
    private static String USER = "root";  
    private static String PASSWORD = "123456";  
    private static String DB_URL = "jdbc:mysql://localhost:3306/mytest?serverTimezone=UTC";  
    private static String DB_DRIVER = "com.mysql.jdbc.Driver";  
    private static Connection connection = null;  
  
    //连接数据库
    public static Connection getConnection(){  
  
        try {  
            Class.forName(DB_DRIVER);  
            connection = DriverManager.getConnection(DB_URL, USER, PASSWORD);  
        } catch (Exception e) {  
            System.out.println("数据库连接异常");  
            e.printStackTrace();  
        }  
        return connection;  
    }  
    public static void closeConnection(Connection connection){  
  
                    if(connection != null){  
                        try {  
                            connection.close(); // 关闭数据库连接
                        } catch (SQLException e) {  
                            e.printStackTrace();  
                        }  
                    }  
                }  
      
public static void closeAll(Connection connection,PreparedStatement statement,ResultSet rSet)
{
    try {
        if(connection!=null)
            connection.close();
    } catch (SQLException e) {
        // TODO 自动生成的 catch 块
        e.printStackTrace();
    }

    try {
        if(statement!=null)
            statement.close();
    } catch (SQLException e) {
        // TODO 自动生成的 catch 块
        e.printStackTrace();
    }

    try {
        if(rSet!=null)
            rSet.close();
    } catch (SQLException e) {
        // TODO 自动生成的 catch 块
        e.printStackTrace();
    }
}
    
//关闭connection和preparedstatement
public static void closePart(Connection connection,PreparedStatement statement)
{
    try {
        if(connection!=null)
            connection.close();
    } catch (SQLException e) {
        // TODO 自动生成的 catch 块
        e.printStackTrace();
    }

    try {
        if(statement!=null)
            statement.close();
    } catch (SQLException e) {
        // TODO 自动生成的 catch 块
        e.printStackTrace();
    }
}
}

DocDao层：

package com.dao;
import com.bean.*;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.bean.*;
import com.dao.DBDao;
public class DocDao {

    public static boolean add_doc(Doc doc)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        ResultSet rs=null;
        try {
            con=DBDao.getConnection();
            String sql="insert into doc_list(title,owner,receiver,time,status,result,place,deletestatus,callback) values(?,?,?,?,?,?,?,?,?)";
            pstmt=con.prepareStatement(sql);
            pstmt.setString(1, doc.getTitle());
            pstmt.setString(2, doc.getOwner());
            pstmt.setString(3, doc.getReceiver());
            pstmt.setString(4, doc.getTime());
            pstmt.setInt(5, doc.getStatus());
            pstmt.setInt(6, doc.getResult());
            pstmt.setString(7, doc.getPlace());
            pstmt.setInt(8, 0);
            pstmt.setInt(9, 0);
            pstmt.executeUpdate();
            return true;
        }
        catch (SQLException e) {
            System.out.println("注册失败");
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(con, pstmt, rs);
        }
        return false;
    }
        
    //删除数据
    @SuppressWarnings("resource")
    public static boolean sendDoc(int id)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        ResultSet rSet=null;
        int status=-1;
        int newstatus=-1;
        String receiver="";
        try {
            con=DBDao.getConnection();
            String sql_query="select * from doc_list where id="+id;
            pstmt=con.prepareStatement(sql_query);
            rSet=pstmt.executeQuery();
            if(rSet.next())
            {
                status=rSet.getInt("status");
            }
            switch (status) {
            case 0:
                newstatus=1;
                receiver="副厂长";
                break;
            case 2:
                newstatus=5;
                receiver="厂长";
                break;
            case 3:
                newstatus=4;
                receiver="部门";
                break;
            case 6:
                newstatus=8;
                receiver="部门和副厂长";
                break;
            case 7:
                newstatus=9;
                receiver="部门和副厂长";
                break;
            case 8:
                newstatus=10;
                receiver="部门";
                break;
            default:
                System.out.println("公文状态有误！");
                break;
            }
            String sql_update="update doc_list set status = ? where id = ?";
            pstmt=con.prepareStatement(sql_update);
            pstmt.setInt(1, newstatus);
            pstmt.setInt(2, id);
            pstmt.executeUpdate();
            return true;
        }
        catch (SQLException e) {
            System.out.println("数据库信息更新失败");
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static ArrayList<Doc> getDocesByCase(String type,String value)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="";
            System.out.println(type);
            if(type.equals("title"))
            {
                sql="select * from doc_list where title='"+value+"'";
            }
            else if(type.equals("owner"))
            {
                sql="select * from doc_list where owner='"+value+"'";
            }
            else if(type.equals("receiver"))
            {
                sql="select * from doc_list where receiver='"+value+"'";
            }
            else if(type.equals("result"))
            {
                sql="select * from doc_list where result='"+value+"'";
            }
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rSet.next())
            {
                Doc doc=new Doc();
                doc.setId(rSet.getInt("id"));
                doc.setTitle(rSet.getString("title"));
                doc.setOwner(rSet.getString("owner"));
                doc.setTime(rSet.getString("time"));
                doc.setReceiver(rSet.getString("receiver"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                doc.setPlace(rSet.getString("place"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    public static ArrayList<Doc> getCheckedorNot(String type)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="";
            System.out.println(type);
            if(type.equals("notchecked"))
            {
                sql="select * from doc_list where status=1";
            }
            else
            {
                sql="select * from doc_list where status!=1 and status!=0 and status!=-1";
            }
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rSet.next())
            {
                Doc doc=new Doc();
                doc.setId(rSet.getInt("id"));
                doc.setTitle(rSet.getString("title"));
                doc.setOwner(rSet.getString("owner"));
                doc.setTime(rSet.getString("time"));
                doc.setReceiver(rSet.getString("receiver"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                doc.setPlace(rSet.getString("place"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    public static ArrayList<Doc> getFcheckedorNot(String type)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="";
            if(type.equals("checked"))
            {
                sql="select * from doc_list where status=6 or status=7";
            }
            else
            {
                sql="select * from doc_list where status=5";
            }
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rSet.next())
            {
                Doc doc=new Doc();
                doc.setId(rSet.getInt("id"));
                doc.setTitle(rSet.getString("title"));
                doc.setOwner(rSet.getString("owner"));
                doc.setTime(rSet.getString("time"));
                doc.setReceiver(rSet.getString("receiver"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                doc.setPlace(rSet.getString("place"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    
    public static ArrayList<Doc> getReceivedByUser(String type,User user)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="";
            if(type.equals("received"))
            {
                sql="select * from doc_list where owner=? and status=10";
            }
            else
            {
                sql="select * from doc_list where owner=? and status!=10";
            }
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());
            rSet=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rSet.next())
            {
                Doc doc=new Doc();
                doc.setId(rSet.getInt("id"));
                doc.setTitle(rSet.getString("title"));
                doc.setTime(rSet.getString("time"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    public static Doc getDocById(Doc doc)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="select * from doc_list where id="+doc.getId();
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            if(rSet.next())
            {
                doc.setTitle(rSet.getString("title"));
                doc.setOwner(rSet.getString("owner"));
                doc.setTime(rSet.getString("time"));
                doc.setReceiver(rSet.getString("receiver"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                doc.setPlace(rSet.getString("place"));
                doc.setTipplace(rSet.getString("tipplace"));
                doc.setFtipplace(rSet.getString("tipfplace"));
                return doc;
            }
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    public static boolean checked_change(Doc doc)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        String sql_update="update doc_list set status = ?,result = ?,receiver = ?,tipplace = ? where id = ?";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql_update);
            preparedStatement.setInt(1, doc.getStatus());
            preparedStatement.setInt(2, doc.getResult());
            preparedStatement.setString(3, doc.getReceiver());
            preparedStatement.setString(4, doc.getTipplace());
            preparedStatement.setInt(5, doc.getId());
            preparedStatement.executeUpdate();
            return true;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return false;
    }
    
    public static boolean fchecked_change(Doc doc)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        String sql_update="update doc_list set status = ?,result = ?,receiver = ?,tipfplace = ? where id = ?";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql_update);
            preparedStatement.setInt(1, doc.getStatus());
            preparedStatement.setInt(2, doc.getResult());
            preparedStatement.setString(3, doc.getReceiver());
            preparedStatement.setString(4, doc.getFtipplace());
            preparedStatement.setInt(5, doc.getId());
            preparedStatement.executeUpdate();
            return true;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return false;
    }
    
    public static boolean formatDoc(Doc doc)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        String sql_update="update doc_list set status = ? where id = ?";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql_update);
            preparedStatement.setInt(1, doc.getStatus());
            preparedStatement.setInt(2, doc.getId());
            preparedStatement.executeUpdate();
            return true;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return false;
    }
    
    public static boolean ReceiveDoc(Doc doc)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        String sql_update="update doc_list set status = ?,callback = 1 where id = ?";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql_update);
            preparedStatement.setInt(1, 10);
            preparedStatement.setInt(2, doc.getId());
            preparedStatement.executeUpdate();
            return true;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return false;
    }
    
    public static ArrayList<Doc> getDocByTime(Doc doc1,Doc doc2)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from doc_list where time between ? and ?";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setString(1,doc1.getTime());
            preparedStatement.setString(2, doc2.getTime());
            rs=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rs.next())
            {
                Doc doc=new Doc();
                doc.setId(rs.getInt("id"));
                doc.setTitle(rs.getString("title"));
                doc.setTime(rs.getString("time"));
                doc.setOwner(rs.getString("owner"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }
    
    public static ArrayList<Doc> getAllDoc()
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from doc_list";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rs.next())
            {
                Doc doc=new Doc();
                doc.setId(rs.getInt("id"));
                doc.setTitle(rs.getString("title"));
                doc.setTime(rs.getString("time"));
                doc.setOwner(rs.getString("owner"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }
    

    
    public static ArrayList<Permission> getPermission(Permission permission)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from permission where id="+permission.getId();
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            ArrayList<Permission> list=new ArrayList<>();
            while(rs.next())
            {
                Permission permission1=new Permission();
                permission1.setId(rs.getInt("id"));
                permission1.setPermission(rs.getInt("permission"));
                list.add(permission1);
            }
            return list;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }
    
    public static boolean deletePermission(Permission permission)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="delete from permission where id="+permission.getId();
            System.out.println(sql);
            pstmt=con.prepareStatement(sql);
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static boolean updatePermission(Permission permission1,Permission permission2)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update permission set permission = ? where id = ? and permission = ?";
            pstmt=con.prepareStatement(sql);
            pstmt.setInt(1, permission2.getPermission());
            pstmt.setInt(2, permission1.getId());
            pstmt.setInt(3, permission1.getPermission());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    

    
    public static boolean deleteDoc(Doc doc)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update doc_list set deletestatus = ? where id = ?";
            pstmt=con.prepareStatement(sql);
            pstmt.setInt(1, doc.getDeletestatus());
            pstmt.setInt(2, doc.getId());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static ArrayList<Doc> getCall()
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=DBDao.getConnection();
            String sql="select * from doc_list where callback=1";
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<Doc> list=new ArrayList<>();
            while(rSet.next())
            {
                Doc doc=new Doc();
                doc.setId(rSet.getInt("id"));
                doc.setTitle(rSet.getString("title"));
                doc.setOwner(rSet.getString("owner"));
                doc.setTime(rSet.getString("time"));
                doc.setReceiver(rSet.getString("receiver"));
                doc.setStatus(rSet.getInt("status"));
                doc.setResult(rSet.getInt("result"));
                doc.setPlace(rSet.getString("place"));
                doc.setDeletestatus(rSet.getInt("deletestatus"));
                doc.setCallback(rSet.getInt("callback"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            DBDao.closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    
    public static boolean setCallOver(Doc doc)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update doc_list set callback = ? where id = ?";
            pstmt=con.prepareStatement(sql);
            pstmt.setInt(1, 0);
            pstmt.setInt(2, doc.getId());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }

}

package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import com.bean.User;

public class UserDao {
    User user = null;
    private String SQL = "";

    public User login(String username, String password,int permissionID) {
        SQL = "select * from user where username = ? and password = ? and permissionID = ?";
        Connection connection = null;
        PreparedStatement pstmt = null;
        try {
            connection = DBDao.getConnection();
            pstmt = (PreparedStatement) connection.prepareStatement(SQL);
            // 这里的意思将用户名和密码填到SQL语句的问号处
            pstmt.setString(1, username);
            pstmt.setString(2, password);
            pstmt.setInt(3, permissionID);
            ResultSet rSet = (ResultSet) pstmt.executeQuery();//得到数据库的查询结果,一个数据集
            // 判断结果集是否有效
            if (rSet.next()) {
                user = new User();
                user.setUsername(rSet.getString("username"));
                user.setPassword(rSet.getString("password"));
                user.setPermissionId(rSet.getInt("permissionID"));
            }   
            pstmt.close();
            connection.close();
            
        } catch (Exception e) {

            e.printStackTrace();
        } finally {
            DBDao.closeConnection(connection);
        }
        return user;
    }
    public static boolean delete_user(User user)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="delete from user where id="+user.getId();
            System.out.println(sql);
            pstmt=con.prepareStatement(sql);
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static boolean update_userstatus(User user)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update users set statu = ? where id = ?";
            pstmt=con.prepareStatement(sql);
            pstmt.setInt(1, user.getStatus());
            pstmt.setInt(2, user.getId());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static boolean update_user(User user)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update user set username=?,password=?,job=? where id = "+user.getId();
            pstmt=con.prepareStatement(sql);
            pstmt.setString(1, user.getUsername());
            pstmt.setString(2, user.getPassword());
            pstmt.setString(3, user.getJob());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    public static ArrayList<User> getAllUser()
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from user";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            ArrayList<User> list=new ArrayList<>();
            while(rs.next())
            {
                User user=new User();
                user.setId(rs.getInt("id"));
                user.setUsername(rs.getString("username"));
                user.setPassword(rs.getString("password"));
                user.setPermissionId(rs.getInt("permissionId"));
                user.setJob(rs.getString("job"));
                user.setStatus(rs.getInt("status"));
                list.add(user);
            }
            return list;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }
    
    public static User getUserById(User user)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from user where id="+user.getId();
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            User user1=new User();
            if(rs.next())
            {
                user1.setId(rs.getInt("id"));
                user1.setUsername(rs.getString("username"));
                user1.setPassword(rs.getString("password"));
                user1.setPermissionId(rs.getInt("permissionId"));
                user1.setStatus(rs.getInt("status"));
                user1.setJob(rs.getString("job"));
            }
            return user1;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }
    public static boolean updatePwd(User user)
    {
        Connection con=null;
        PreparedStatement pstmt=null;
        try {
            con=DBDao.getConnection();
            String sql="update user set password = ? where username = ?";
            pstmt=con.prepareStatement(sql);
            pstmt.setString(1, user.getPassword());
            pstmt.setString(2, user.getUsername());
            pstmt.executeUpdate();
            return true;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(con, pstmt);
        }
        return false;
    }
    
    public static User getUserByUsername(User user)
    {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rs=null;
        String sql="select * from user where username='"+user.getUsername()+"'";
        try {
            connection=DBDao.getConnection();
            preparedStatement=connection.prepareStatement(sql);
            rs=preparedStatement.executeQuery();
            User user1=new User();
            if(rs.next())
            {
                user1.setId(rs.getInt("id"));
                user1.setPermissionId(rs.getInt("permissionId"));
                System.out.println(user1.getPermissionId());
            }
            return user1;
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        finally {
            DBDao.closePart(connection, preparedStatement);
        }
        return null;
    }

}

前面是 UserDao层

登录的servlet

package com.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.*;
import com.bean.User;

public class LoginServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setCharacterEncoding("utf-8");

        // 获取用户名和密码
        String username = request.getParameter("username");

        String password = request.getParameter("password");
        
        int permissionID =Integer.parseInt(request.getParameter("permissionID"));
        // 获取UserDao实例
        UserDao userDao = new UserDao();
        User user= userDao.login(username, password, permissionID);
        if(permissionID==1){
            request.getRequestDispatcher("changzhang.jsp").forward(request, response);
            }
        else if(permissionID==2) {
            request.getRequestDispatcher("fuchangzhang.jsp").forward(request, response);
            }
        else if(permissionID==3) {
            request.getRequestDispatcher("bangongshi.jsp").forward(request, response);
            }
        else if(permissionID==4) {
            request.getRequestDispatcher("zhuchangqu.jsp").forward(request, response);
            }
        else if(permissionID==5) {
            request.getRequestDispatcher("yifenqu.jsp").forward(request, response);
            }
        else if(permissionID==6) {
            request.getRequestDispatcher("erfenqu.jsp").forward(request, response);
            }
        else if(permissionID==7) {
            request.getRequestDispatcher("sanfenqu.jsp").forward(request, response);
            }
        else if(permissionID==8) {
            request.getRequestDispatcher("xiaoshoubumen.jsp").forward(request, response);
            }
        else if(permissionID==9) {
            request.getRequestDispatcher("caiwubumen.jsp").forward(request, response);
            }
        else  {
            request.getRequestDispatcher("guanliyuan.jsp").forward(request, response);
            }


    }

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

}

公文拟制的servlet

package com.servlet;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.Doc;
import com.dao.DocDao;

/**
 * Servlet implementation class writedoc
 */
@WebServlet("/writedoc")
public class Writedoc extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Writedoc() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String text=request.getParameter("text");
        String user=request.getParameter("user");
        String title=request.getParameter("title");
        System.out.println(text);
        Date date = new Date();
        SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String time=dateFormat.format(date).toString();
        String path="D:\5\text4\WebContent\text\"+title+"_"+user+"_"+time.split(":| ")[0]+time.split(":| ")[1]+time.split(":| ")[2]+time.split(":| ")[3]+".txt";
        System.out.println(path);
        File file = new File(path);
        FileOutputStream fileOutputStream;
        
        Doc doc=new Doc();
        doc.setTitle(title);
        doc.setOwner(user);
        doc.setReceiver("办公室");
        doc.setTime(time);
        doc.setStatus(-1);
        doc.setResult(0);
        doc.setPlace(path);
        if(DocDao.add_doc(doc))
        {
            try {
                fileOutputStream = new FileOutputStream(file);
                 try {
                    fileOutputStream.write((text).getBytes());
                    fileOutputStream.close();
                    response.getWriter().write("yes");
                    
                } catch (IOException e) {
                    // TODO 自动生成的 catch 块
                    response.getWriter().write("no");
                    e.printStackTrace();
                }
                
            } catch (FileNotFoundException e) {
                // TODO 自动生成的 catch 块
                response.getWriter().write("no");
                e.printStackTrace();
            }
        }
        else
        {
            response.getWriter().write("no");
        }
    }

}

签收公文：

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.Doc;
import com.dao.DocDao;

/**
 * Servlet implementation class Signdoc
 */
@WebServlet("/Signdoc")
public class Signdoc extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Signdoc() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        int id=Integer.parseInt(request.getParameter("id"));
        System.out.println(id);
        Doc doc=new Doc();
        doc.setId(id);
        if(DocDao.ReceiveDoc(doc))
            response.getWriter().write("yes");
        else
            response.getWriter().write("no");
    }

}

发送

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dao.DocDao;

/**
 * Servlet implementation class Senddoc
 */
@WebServlet("/Senddoc")
public class Senddoc extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Senddoc() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        int id=Integer.parseInt(request.getParameter("id"));
        if(DocDao.sendDoc(id))
        {
            response.getWriter().write("yes");
        }
        else
        {
            response.getWriter().write("no");
        }
    }

}

删除：

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.Doc;
import com.dao.DocDao;

/**
 * Servlet implementation class Deletedoc
 */
@WebServlet("/Deletedoc")
public class Deletedoc extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Deletedoc() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        int id=Integer.parseInt(request.getParameter("id"));
        Doc doc=new Doc();
        doc.setId(id);
        doc.setDeletestatus(1);
        if(DocDao.deleteDoc(doc))
            response.getWriter().write("yes");
        else
            response.getWriter().write("no");
    }

}

修改：

package com.servlet;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.bean.Doc;
import com.dao.DocDao;

/**
 * Servlet implementation class Updatedoc
 */
@WebServlet("/Updatedoc")
public class Updatedoc extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Updatedoc() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        int id=Integer.parseInt(request.getParameter("id"));
        int result=Integer.parseInt(request.getParameter("result"));
        String tip=request.getParameter("tip");
        Date date = new Date();
        SimpleDateFormat dateFormat= new SimpleDateFormat("yyyy-MM-dd-hh-mm-ss");
        String time=dateFormat.format(date).toString();
        String path="E:\work_space\official-document\WebContent\tip\"+id+"_"+time+"_tip.txt";
        File file = new File(path);
        FileOutputStream fileOutputStream;
        
        int status;
        if(result==0)
            status=3;
        else
            status=2;
        Doc doc=new Doc();
        doc.setId(id);
        doc.setResult(result);
        doc.setStatus(status);
        doc.setReceiver("办公室");
        doc.setTipplace(path);
        if(DocDao.checked_change(doc))
        {
            try {
                fileOutputStream = new FileOutputStream(file);
                 try {
                    fileOutputStream.write((tip).getBytes());
                    fileOutputStream.close();
                    response.getWriter().write("yes");
                    
                } catch (IOException e) {
                    // TODO 自动生成的 catch 块
                    response.getWriter().write("no");
                    e.printStackTrace();
                }
                
            } catch (FileNotFoundException e) {
                // TODO 自动生成的 catch 块
                response.getWriter().write("no");
                e.printStackTrace();
            }
        }
        else
            response.getWriter().write("no");
        
    }

}

登录界面的jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
body {
    top: 20%;
    text-align: center
}

.div {
    top: 50%;
    margin: auto;
}
</style>

<title>Insert title here</title>

<!--判断是否为空-->
<script type="text/javascript">
    function login(form) {
        if (form.username.value == "") {
            alert("用户不能为空！");
            return false;
        }
        if (form.password.value == "") {
            alert("密码不能为空！");
            return false;
        }
    }
</script>

</head>
<body>
    <h1>登录</h1>
    <hr>
    <br>
    <br>
    <br>
    <div class="div">
        <form method="post" action="LoginServlet"
            onSubmit="return login(this);">
            <center>
                <table>
                    <tr>
                        <td>用户名:</td>
                        <td><input type="text" name="username"></td>
                    </tr>
                    <tr>
                        <td>密码:</td>
                        <td><input type="password" name="password"></td>
                    </tr>
                </table>
            <select name="pamissionID">
                <option value=1>厂长</option>
                <option value=2>副厂长</option>
                <option value=3>办公室</option>
                <option value=4>主厂区</option>
                <option value=5>一分厂</option>
                <option value=6>二分厂</option>
                <option value=7>三分厂</option>
                <option value=8>销售部门</option>
                <option value=9>财务部门</option>
                <option value=10>系统管理员</option>
            </select>
            </center>
            <br> <br> <input type="submit" value="点击登录"
                style=" 120px; height: 33px; background: #ccc; color: black">
        </form>
    </div>

    <br>
    <br>
    <br>
    <br>

</body>
</html>