持续更新选课系统，今天发表了servlet层代码和dao层代码，整个选课系统就完毕了
dao层
package dao; import java.sql.*; public class DBUtil { //eshop为数据库名称，db_user为数据库用户名db_password为数据库密码 public static String db_url = "jdbc:mysql://localhost:3306/schoolclass?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT"; public static String db_user = "root"; public static String db_password = "root1"; public static Connection getConn() { Connection conn = null; try { Class.forName("com.mysql.cj.jdbc.Driver"); conn = DriverManager.getConnection(db_url, db_user, db_password); System.out.println("连接成功"); } catch (Exception e) { System.out.println("连接失败"); e.printStackTrace(); } return conn; } public static void close(Statement state, Connection conn) { if(state!=null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if(conn!=null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } public static void close(ResultSet rs, Statement state, Connection conn) { if(rs!=null) { try { rs.close(); } catch (SQLException e) { e.printStackTrace(); } } if(state!=null) { try { state.close(); } catch (SQLException e) { e.printStackTrace(); } } if(conn!=null) { try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } } }
package dao; import java.sql.*; import java.util.*; import entity.School; public class SchoolDaoImpl implements SchoolDao{ Connection conn=(Connection)DBUtil.getConn(); public boolean Stuadd(School school) { boolean flag=false; PreparedStatement ps=null; try { //String sql="insert into school values('"+school.getclassname()+"','"+school.getclassteacher()+"','"+school.getclassplace()+"')"; ps=conn.prepareStatement("insert into student(stuID,stuname,stusex,stuclass,stumajor,stupassword)"+"values(?,?,?,?,?,?)"); ps.setString(1,school.getStuID()); ps.setString(2,school.getStuname()); ps.setString(3,school.getStusex()); ps.setString(4,school.getStuclass()); ps.setString(5,school.getStumajor()); ps.setString(6, school.getStupassword()); int i=ps.executeUpdate(); ps.close(); conn.close(); if(i>0) { flag = true;System.out.println("添加成功"); } }catch(SQLException e) { e.printStackTrace(); } return flag; } public boolean Teacheradd(School school) { boolean flag=false; PreparedStatement ps=null; try { //String sql="insert into school values('"+school.getclassname()+"','"+school.getclassteacher()+"','"+school.getclassplace()+"')"; ps=conn.prepareStatement("insert into teacher(teacherID,teachername,teachersex,teachercollege,teachercall,teacherpassword)"+"values (?,?,?,?,?,?)"); ps.setString(1,school.getTeacherID()); ps.setString(2,school.getTeachername()); ps.setString(3,school.getTeachersex()); ps.setString(4,school.getTeachercollege()); ps.setString(5,school.getTeachercall()); ps.setString(6, school.getTeacherpassword()); int i=ps.executeUpdate(); System.out.println("添加成功"); ps.close(); conn.close(); if(i>0) { flag = true; } }catch(SQLException e) { e.printStackTrace(); } return flag; } public boolean classadd(String teacherID,String teachername,String classID,String classname,String classnum) { boolean flag=false; PreparedStatement ps=null; try { //String sql="insert into school values('"+school.getclassname()+"','"+school.getclassteacher()+"','"+school.getclassplace()+"')"; ps=conn.prepareStatement("insert into class(teacherID,teachername,classID,classname,classnum)"+"values (?,?,?,?,?)"); ps.setString(1,teacherID); ps.setString(2,teachername); ps.setString(3,classID); ps.setString(4,classname); ps.setString(5,classnum); int i=ps.executeUpdate(); ps.close(); conn.close(); if(i>0) { flag = true;System.out.println("添加成功"); } }catch(SQLException e) { e.printStackTrace(); } return flag; } public List<School>showclass(){ List<School> list = new ArrayList<School>(); try { System.out.println(1); String sql="select * from class"; PreparedStatement pstmt = conn.prepareStatement(sql); ResultSet rs = pstmt.executeQuery(); System.out.println(2); while(rs.next()) { School school=new School(); school.setTeacherID(rs.getString("teacherID")); school.setClassID(rs.getString("classID")); school.setClassname(rs.getString("classname")); school.setClassnum(rs.getString("classnum")); school.setTeachername(rs.getString("teachername")); school.setClassnow(rs.getInt("classnow")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public List<School>showteacher(String teacherID){ List<School> list = new ArrayList<School>(); try { String sql="select * from teacher where teacherID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,teacherID); ResultSet rs = pstmt.executeQuery(); while(rs.next()) { School school=new School(); school.setTeacherID(rs.getString("teacherID")); System.out.println(teacherID); school.setTeacherpassword(rs.getString("teacherpassword")); school.setTeachername(rs.getString("teachername")); school.setTeachersex(rs.getString("teachersex")); school.setTeachercollege(rs.getString("teachercollege")); school.setTeachercall(rs.getString("teachercall")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public String showteachername(String teacherID){ String password=null; try { String sql="select * from teacher where teacherID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,teacherID); ResultSet rs = pstmt.executeQuery(); while(rs.next()) { School school=new School(); school.setTeacherpassword(rs.getString("teacherpassword")); password=school.getTeacherpassword(); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return password; } public String stushowname(String stuID){ String password=null; try { String sql="select * from student where stuID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,stuID); ResultSet rs = pstmt.executeQuery(); while(rs.next()) { School school=new School(); school.setStupassword(rs.getString("stupassword")); password=school.getStupassword(); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return password; } public boolean teacherupdate(String teacherID,String teachername,String teachersex,String teachercollege,String teachercall) { boolean flag=false; try { String sql="update teacher set teachername=?,teachersex=?,teachercollege=?,teachercall=?where teacherID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(5, teacherID); pstmt.setString(1,teachername); pstmt.setString(2,teachersex); pstmt.setString(3,teachercollege); pstmt.setString(4,teachercall); int i = pstmt.executeUpdate(); pstmt.close(); conn.close(); if(i>0) {flag = true;System.out.println("修改成功！！！");} }catch(SQLException e) { e.printStackTrace(); } return flag; } public List<School>stushow(String stuID){ List<School> list = new ArrayList<School>(); try { String sql="select * from student where stuID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,stuID); ResultSet rs = pstmt.executeQuery(); while(rs.next()) { School school=new School(); school.setStuID(rs.getString("stuID")); System.out.println(stuID); school.setStupassword(rs.getString("stupassword")); school.setStuname(rs.getString("stuname")); school.setStusex(rs.getString("stusex")); school.setStuclass(rs.getString("stuclass")); school.setStumajor(rs.getString("stumajor")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public boolean stuupdate(String stuID,String stuname,String stusex,String stuclass,String stumajor) { boolean flag=false; try { String sql="update student set stuname=?,stusex=?,stuclass=?,stumajor=?where stuID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(5, stuID); pstmt.setString(1,stuname); System.out.println(stuname+'2'); pstmt.setString(2,stusex); pstmt.setString(3,stuclass); pstmt.setString(4,stumajor); int i = pstmt.executeUpdate(); pstmt.close(); conn.close(); if(i>0) {flag = true;System.out.println("修改成功！！！");} }catch(SQLException e) { e.printStackTrace(); } return flag; } public List<School> classshow() { // TODO 自动生成的方法存根 List<School> list = new ArrayList<School>(); try { System.out.println(1); String sql="select * from class"; PreparedStatement pstmt = conn.prepareStatement(sql); ResultSet rs = pstmt.executeQuery(); System.out.println(2); while(rs.next()) { School school=new School(); school.setClassnow(rs.getInt("classnow")); school.setClassnum(rs.getString("classnum")); int now=school.getClassnow(); int num= Integer.parseInt(school.getClassnum()); if(now<num) { school.setTeacherID(rs.getString("teacherID")); school.setClassID(rs.getString("classID")); school.setClassname(rs.getString("classname")); school.setClassnum(rs.getString("classnum")); school.setTeachername(rs.getString("teachername")); school.setClassnow(rs.getInt("classnow")); list.add(school);} } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public List<School> selectshow(String classID) { // TODO 自动生成的方法存根 List<School> list = new ArrayList<School>(); try { System.out.println(1); String sql="select * from class where classID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,classID); ResultSet rs = pstmt.executeQuery(); System.out.println(2); while(rs.next()) { School school=new School(); school.setTeacherID(rs.getString("teacherID")); school.setClassID(rs.getString("classID")); school.setClassname(rs.getString("classname")); school.setClassnum(rs.getString("classnum")); school.setTeachername(rs.getString("teachername")); school.setClassnow(rs.getInt("classnow")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public boolean selectclass(School school) { // TODO 自动生成的方法存根 boolean flag=false; PreparedStatement ps=null; try { //String sql="insert into school values('"+school.getclassname()+"','"+school.getclassteacher()+"','"+school.getclassplace()+"')"; ps=conn.prepareStatement("insert into selectclass(stuID,stuname,stusex,stuclass,stumajor,teachername,classID,classname,classnow,classnum)"+"values(?,?,?,?,?,?,?,?,?,?)"); ps.setString(1,school.getStuID()); ps.setString(2,school.getStuname()); ps.setString(3,school.getStusex()); ps.setString(4,school.getStuclass()); ps.setString(5,school.getStumajor()); ps.setString(6, school.getTeachername()); ps.setString(7, school.getClassID()); ps.setString(8, school.getClassname()); ps.setInt(9, school.getClassnow()); ps.setString(10, school.getClassnum()); int i=ps.executeUpdate(); ps.close(); conn.close(); if(i>0) { flag = true;System.out.println("添加成功"); } }catch(SQLException e) { e.printStackTrace(); } return flag; } public boolean updatenow(int classnow,String classID) { // TODO 自动生成的方法存根 boolean flag=false; try { String sql="update class set classnow=? where classID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setInt(1,classnow); pstmt.setString(2, classID); System.out.println(classnow); int i = pstmt.executeUpdate(); pstmt.close(); conn.close(); if(i>0) {flag = true;System.out.println("修改成功！！！");} }catch(SQLException e) { e.printStackTrace(); } return flag; } public List<School> stushowclass(String teacherID) { // TODO 自动生成的方法存根 List<School> list = new ArrayList<School>(); try { System.out.println(1); String sql="select * from class where teacherID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,teacherID); ResultSet rs = pstmt.executeQuery(); System.out.println(2); while(rs.next()) { School school=new School(); school.setTeacherID(rs.getString("teacherID")); school.setClassID(rs.getString("classID")); school.setClassname(rs.getString("classname")); school.setClassnum(rs.getString("classnum")); school.setTeachername(rs.getString("teachername")); school.setClassnow(rs.getInt("classnow")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } public List<School> showstudent(String classID) { // TODO 自动生成的方法存根 List<School> list = new ArrayList<School>(); try { System.out.println(1); String sql="select * from selectclass where classID=?"; PreparedStatement pstmt = conn.prepareStatement(sql); pstmt.setString(1,classID); ResultSet rs = pstmt.executeQuery(); System.out.println(2); while(rs.next()) { School school=new School(); school.setStuID(rs.getString("stuID")); school.setStusex(rs.getString("stusex")); school.setStuname(rs.getString("stuname")); school.setStuclass(rs.getString("stuclass")); school.setStumajor(rs.getString("stumajor")); school.setClassname(rs.getString("classname")); list.add(school); } rs.close(); pstmt.close(); conn.close(); }catch(SQLException e) { e.printStackTrace(); } return list; } }
servelt层代码
package SchoolServlet; 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 dao.SchoolDaoImpl; import entity.School; /** * Servlet implementation class SchoolAddServlet */ @WebServlet("/SchoolAddServlet") public class SchoolAddServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public SchoolAddServlet() { 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 request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); //response.getWriter().append("Served at: ").append(request.getContextPath()); String method=request.getParameter("method"); String stuID=request.getParameter("stuID"); String stuname=request.getParameter("stuname"); String stusex=request.getParameter("stusex"); String stumajor=request.getParameter("stumajor"); String stuclass=request.getParameter("stuclass"); String stupassword=request.getParameter("stupassword"); String teacherID=request.getParameter("teacherID"); String teachername=request.getParameter("teachername"); String teachersex=request.getParameter("teachersex"); String teachercollege=request.getParameter("teachercollege"); String teachercall=request.getParameter("teachercall"); String teacherpassword=request.getParameter("teacherpassword"); School school=new School(); school.setStuclass(stuclass); school.setStuID(stuID); school.setStumajor(stumajor); school.setStuname(stuname); school.setStusex(stusex); school.setStupassword(stupassword); school.setTeachercall(teachercall); school.setTeachercollege(teachercollege); school.setTeacherID(teacherID); school.setTeachername(teachername); school.setTeachersex(teachersex); school.setTeacherpassword(teacherpassword); SchoolDaoImpl dao=new SchoolDaoImpl(); if("stu".equals(method)) { try{ System.out.println(1); dao.Stuadd(school); request.getRequestDispatcher("manage.jsp").forward(request, response); }catch(Exception e){ System.out.println("添加失败"); e.printStackTrace(); } } if("teacher".equals(method)) { try{ //System.out.println(1); dao.Teacheradd(school); request.getRequestDispatcher("manage.jsp").forward(request, response); }catch(Exception e){ System.out.println("添加失败"); e.printStackTrace(); } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
package SchoolServlet; 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 javax.servlet.http.HttpSession; import javax.websocket.Session; import dao.SchoolDaoImpl; import entity.School; /** * Servlet implementation class SchoolServlet */ @WebServlet("/SchoolServlet") public class SchoolServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public SchoolServlet() { 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()); request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); String ID=request.getParameter("username"); HttpSession session=request.getSession(); session.setAttribute("ID", ID);//存储数据 request.setAttribute("ID", ID); String password=request.getParameter("password"); String method=request.getParameter("profession"); SchoolDaoImpl sd=new SchoolDaoImpl(); if("1".equals(method)) { try{ System.out.println(1); if("123456".equals(ID)&&"654321".equals(password)) { response.getWriter().println("<script type='text/javascript'> alert('登录成功')</script>"); request.getRequestDispatcher("manage.jsp").forward(request, response);} else { response.getWriter().println("<script type='text/javascript'> alert('密码或账号错误')</script>"); request.getRequestDispatcher("school.jsp").forward(request, response);} }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("2".equals(method)) { try{ System.out.println(1); String teacherpass=sd.showteachername(ID); if(password.equals(teacherpass)) { response.getWriter().println("<script type='text/javascript'> alert('登录成功')</script>"); request.getRequestDispatcher("teacher.jsp").forward(request, response);} else { response.getWriter().println("<script type='text/javascript'> alert('账号或密码错误')</script>"); request.getRequestDispatcher("school.jsp").forward(request, response);} }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("3".equals(method)) { try{ System.out.println(1); String stupass=sd.stushowname(ID); if(password.equals(stupass)) { SchoolDaoImpl sd1=new SchoolDaoImpl(); java.util.List<School> list=sd1.stushow(ID); request.setAttribute("list", list); response.getWriter().println("<script type='text/javascript'> alert('登录成功')</script>"); request.getRequestDispatcher("student.jsp").forward(request, response);} else { response.getWriter().println("<script type='text/javascript'> alert('账号或密码错误')</script>"); request.getRequestDispatcher("school.jsp").forward(request, response);} }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
package SchoolServlet; 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 dao.SchoolDaoImpl; import entity.School; /** * Servlet implementation class Studentservlet */ @WebServlet("/Studentservlet") public class Studentservlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public Studentservlet() { 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()); request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); String method=request.getParameter("method"); String stuID=(String) request.getSession().getAttribute("stuID"); String stuname=(String) request.getSession().getAttribute("stuname"); System.out.println(stuname+'0'); String stusex=(String) request.getSession().getAttribute("stusex"); String stuclass=(String) request.getSession().getAttribute("stuclass"); String stumajor=(String) request.getSession().getAttribute("stumajor"); SchoolDaoImpl sd=new SchoolDaoImpl(); if("show".equals(method)) { try{ java.util.List<School> list=sd.stushow(stuID); request.setAttribute("list", list); System.out.println("listshow"); request.getRequestDispatcher("studentupdate.jsp").forward(request, response); }catch(Exception e){ System.out.println("未能正确显示出个人信息"); e.printStackTrace(); } } if("showclass".equals(method)) { try{ java.util.List<School> list=sd.showclass(); request.setAttribute("list", list); System.out.println("listshow"); request.getRequestDispatcher("classshow.jsp").forward(request, response); }catch(Exception e){ System.out.println("未能读出数据！"); e.printStackTrace(); } } if("update".equals(method)) { try{ String stuID1=request.getParameter("stuID"); String stuname1=request.getParameter("stuname"); String stusex1=request.getParameter("stusex"); String stuclass1=request.getParameter("stuclass"); String stumajor1=request.getParameter("stumajor"); System.out.println(1); System.out.println(stuname+'1'); sd.stuupdate(stuID1,stuname1,stusex1,stuclass1,stumajor1); request.getRequestDispatcher("student.jsp").forward(request, response); }catch(Exception e){ System.out.println("修改失败"); e.printStackTrace(); } } if("classshow".equals(method)) { try{ System.out.println(1); System.out.println(stuname+'1'); java.util.List<School> list=sd.classshow(); request.setAttribute("list", list); request.getRequestDispatcher("selectshow.jsp").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("selectshow".equals(method)) { try{ System.out.println(1); System.out.println(stuname+'1'); String classID=request.getParameter("classID"); java.util.List<School> list=sd.selectshow(classID); request.setAttribute("list", list); request.getRequestDispatcher("selectclass.jsp").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("selectclass".equals(method)) { try{ School school=new School(); String teachername=(String) request.getSession().getAttribute("teachername"); String classID=(String) request.getSession().getAttribute("classID"); String classname=(String) request.getSession().getAttribute("classname"); String classnum=(String) request.getSession().getAttribute("classnum"); int classnow=(int) request.getSession().getAttribute("classnow"); System.out.println(classnow); school.setStuID(stuID); school.setStuname(stuname); school.setStusex(stusex); school.setStuclass(stuclass); school.setStumajor(stumajor); school.setClassID(classID); school.setClassname(classname); school.setTeachername(teachername); school.setClassnow(classnow); school.setClassnum(classnum); System.out.println(1); System.out.println(stuname+'1'); sd.selectclass(school); int now=school.getClassnow(); ++now; SchoolDaoImpl sd1=new SchoolDaoImpl(); sd1.updatenow(now,classID); request.getRequestDispatcher("Studentservlet?method=classshow").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
package SchoolServlet; import java.awt.List; 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 dao.SchoolDaoImpl; import entity.School; /** * Servlet implementation class Teacherservlet */ @WebServlet("/Teacherservlet") public class Teacherservlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public Teacherservlet() { 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 request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); //response.getWriter().append("Served at: ").append(request.getContextPath()); String method=request.getParameter("method"); String teacherID=(String) request.getSession().getAttribute("teacherID"); String teachername=request.getParameter("teachername"); String teachersex=request.getParameter("teachersex"); String teachercollege=request.getParameter("teachercollege"); String teachercall=request.getParameter("teachercall"); String classID=request.getParameter("classID"); String classname=request.getParameter("classname"); String classnum=request.getParameter("classnum"); SchoolDaoImpl sd=new SchoolDaoImpl(); System.out.println(method+teacherID); if("show".equals(method)) { try{ System.out.println("showteacher0"); java.util.List<School> list=sd.showteacher(teacherID); System.out.println("showteacher1"); request.setAttribute("list", list); System.out.println("listshow"); request.getRequestDispatcher("teacherupdate.jsp").forward(request, response); }catch(Exception e){ System.out.println("未能正确显示出个人信息"); e.printStackTrace(); } } if("showteacher".equals(method)) { try{ System.out.println("showteacher0"); String teacherID1=request.getParameter("teacherID"); java.util.List<School> list=sd.showteacher(teacherID1); System.out.println("showteacher1"); request.setAttribute("list", list); System.out.println("listshow"); request.getRequestDispatcher("teachershow.jsp").forward(request, response); }catch(Exception e){ System.out.println("未能正确显示出个人信息"); e.printStackTrace(); } } if("showname".equals(method)) { try{ System.out.println("showteacher0"); java.util.List<School> list=sd.showteacher(teacherID); System.out.println("showteacher1"); request.setAttribute("list", list); System.out.println("listshow"); request.getRequestDispatcher("classadd.jsp").forward(request, response); }catch(Exception e){ System.out.println("未能正确显示出个人信息"); e.printStackTrace(); } } if("update".equals(method)) { try{ System.out.println(1); sd.teacherupdate(teacherID,teachername,teachersex,teachercollege,teachercall); request.getRequestDispatcher("teacher.jsp").forward(request, response); }catch(Exception e){ System.out.println("修改失败"); e.printStackTrace(); } } if("classadd".equals(method)) { try{ System.out.println(1); String teachername1=(String) request.getSession().getAttribute("teachername"); sd.classadd(teacherID,teachername1,classID,classname,classnum); request.getRequestDispatcher("teacher.jsp").forward(request, response); }catch(Exception e){ System.out.println("添加失败"); e.printStackTrace(); } } if("name".equals(method)) { try{ //System.out.println(1); java.util.List<School> list=sd.showteacher(teacherID); request.setAttribute("list", list); request.getRequestDispatcher("teacher.jsp").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("showclass".equals(method)) { try{ //System.out.println(1); java.util.List<School> list=sd.stushowclass(teacherID); request.setAttribute("list", list); request.getRequestDispatcher("stushowclass.jsp").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } if("showstudent".equals(method)) { try{ //System.out.println(1); java.util.List<School> list=sd.showstudent(classID); request.setAttribute("list", list); request.getRequestDispatcher("stushow.jsp").forward(request, response); }catch(Exception e){ System.out.println("失败"); e.printStackTrace(); } } } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }