需要网站系统开发需要掌握的技术：
实施Java的WEB项目需要掌握的技术如：
面向对象分析设计思想，设计模式和框架结构,
XML语言,网页脚本语言,数据库,应用服务器,集成开发环境
Java语言是完全面向对象的语言，
所以在项目设计时会有很大的帮助，在设计时应尽量舍弃以往的面向过程的设计方式。
在分析项目业务关系的时候，应用一些UML(Unified Modeling Language)图,例如常用的用例图，类图，时序图等等,会有很大的帮助，
在服务器和设计模式结构中会应用到自定义文件，而且在应用高级设计时也会定义自用的标签，现在流行的是用XML去定义配置，所以XML语言应该有一定掌握
为了提高WEB项目的整体性能，提高人机交互的友好界面，网页的脚本语言是很有用处的，有的时候可以解决很大的难题或提高程序的性能和应用性
JavaScript是一种基于对象和事件驱动并具有安全性能的脚本语言。
使用它的目的是与HTML超文本标记语言、Java 脚本语言（Java小程序）一起实现在一个Web页面中链接多个对象，与Web客户交互作用。从而可以开发客户端的应用程序等。
源程序：登陆界面及其功能的设计
package com.jaovo.msg.dao;
import java.util.List;
import com.jaovo.msg.model.User;
public interface IUserDao {
public void add(User user);
public void delete(int id);
public void update(User user);
public User load(int id);
public User load(String username);
public List<User> load();
}
package com.jaovo.msg.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.jaovo.msg.Util.DBUtil;
import com.jaovo.msg.Util.UserException;
import com.jaovo.msg.model.User;
import sun.net.www.content.text.plain;
public class UserDaoImpl implements IUserDao {
@Override
public void add(User user) {
//获得链接对象
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select count(*) from t_user where username = ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getUsername());
//接收结果集
resultSet = preparedStatement.executeQuery();
//遍历结果集
while(resultSet.next()) {
if (resultSet.getInt(1) > 0) {
throw new UserException("用户已存在") ;
}
}
sql = "insert into t_user(username,password,nickname) value (?,?,?)";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getUsername());
preparedStatement.setString(2, user.getPassword());
preparedStatement.setString(3, user.getNickname());
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
//关闭资源
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public void delete(int id) {
Connection connection = DBUtil.getConnection();
String sql = "delete from t_user where id = ?";
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public void update(User user) {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "update t_user set password = ? , nickname=? where id = ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, user.getPassword());
preparedStatement.setString(2, user.getNickname());
preparedStatement.setInt(3, user.getId());
preparedStatement.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}
@Override
public User load(int id) {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from t_user where id = ?";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
User user = null;
try {
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(id);
user.setUsername(resultSet.getString("username"));
user.setPassword(resultSet.getString("password"));
user.setNickname(resultSet.getString("nickname"));
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return user;
}
@Override
public User load(String username) {
// TODO Auto-generated method stub
return null;
}
@Override
public List<User> load() {
Connection connection = DBUtil.getConnection();
//准备sql语句
String sql = "select * from t_user ";
//创建语句传输对象
PreparedStatement preparedStatement = null;
ResultSet resultSet = null;
//集合中只能放入user对象
List<User> users = new ArrayList<User>();
User user = null;
try {
preparedStatement = connection.prepareStatement(sql);
resultSet = preparedStatement.executeQuery();
while(resultSet.next()) {
user = new User();
user.setId(resultSet.getInt("id"));
user.setUsername(resultSet.getString("username"));
user.setPassword(resultSet.getString("password"));
user.setNickname(resultSet.getString("nickname"));
users.add(user);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(resultSet);
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
return users;
}
}
package com.jaovo.msg.model;
public class User {
private int id;
private String username;
private String nickname;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package com.jaovo.msg.Util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBUtil {
public static Connection getConnection() {
try {
//1 加载驱动
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String user = "root";
String password = "root";
String url = "jdbc:mysql://localhost:3306/jaovo_msg";
Connection connection = null;
try {
//2 创建链接对象connection
connection = DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return connection;
}
//关闭资源的方法
public static void close(Connection connection ) {
try {
if (connection != null) {
connection.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(PreparedStatement preparedStatement ) {
try {
if (preparedStatement != null) {
preparedStatement.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void close(ResultSet resultSet ) {
try {
if (resultSet != null) {
resultSet.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
package com.jaovo.msg.Util;
public class UserException extends RuntimeException{
public UserException() {
super();
// TODO Auto-generated constructor stub
}
public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public UserException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public UserException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public UserException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
<%@ 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>
<title>用户添加页面</title>
</head>
<body>
<%=request.getAttribute("error") %>
<form action="add.jsp" method="get">
<table align="center" border="2" width="500">
<tr>
<td>用户账号 : </td>
<td>
<input type="text" name="username" />
</td>
</tr>
<tr>
<td>用户密码:</td>
<td>
<input type="password" name="password" />
</td>
</tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="提交" />
<input type="reset" value="重置" />
</td>
</tr>
</table>
</form>
</body>
</html>
程序运行截图：
对这门课的希望和自己的目标，并具体列出你计划每周花多少时间在这门课上：
对于这门课，我想的是好好学其中的知识，独立自主完成 数据库的增删改查，独立自主完成一个小型的MIS系统，每周的话，是周一到周五每天有两个多小时在其中学习，周日 希望是能借着百度，独立学习数据库，完成一个一个的小点。