课程信息管理系统

Posted 2021-01-25 liujinxin123

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本系统是基于javaBean+jsp+servelt+mysql制作而成，大致过程是在java类中实现数据库的连接与关闭，并写出数据库增删改查的函数，以备在Servlet中调用，之后是在jsp中制作页面以及实现页面的跳转和数据的输入，在Servlet中获取jsp中输入的值，并作出判断。在这个实验中，页面跳转通过的是链接，<a href=""> </a>,需要注意的地方是，在几个输入的界面，其中有<form name = "form1" action = "ClassServlet" method = "post">语句，每个输入界面的name="from"其中的名字应该是不一样的。在Servlet中，我运用了java中的对话框来对输入输出结果进行提醒，通过request.getParameter函数来获取页面输入的值。

（一）通过Navicat在数据库中建立一个表用来储存信息

（1）新建一个名为sqltestdb的数据库

技术分享图片

（2）在新建的数据库中新建一个名为shangke的表，表的属性为

技术分享图片

（二）java层

（1）连接数据库类，在com.util包中创建

DBUtil.java

package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBUtil {
    public static String db_url = "jdbc:mysql://localhost:3306/sqltestdb";
    public static String db_user = "root";
    public static String db_password = "751208";

    public static Connection getConn() {
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(db_url, db_user, db_password);
        } catch (Exception e) {
            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();
            }
        }
    }
}

其中db_user和db_password分别是数据库的账号和密码，不同的人可能设置的不一样

（2）javaBean类，在com.bean包中建立

ClassBean.java

package com.bean;

public class ClassBean {
    private String classname;
    private String teachname;
    private String site;
    public String getClassname() {
        return classname;
    }
    public void setClassname(String calssname) {
        this.classname = calssname;
    }
    public String getTeachname() {
        return teachname;
    }
    public void setTeachname(String teachname) {
        this.teachname = teachname;
    }
    public String getSite() {
        return site;
    }
    public void setSite(String site) {
        this.site = site;
    }
    public String toString()
    {
        return "classname="+classname+",teachname="+teachname+",site="+site;
    }
}

(3)数据库增删改查类，在com.dao中建立

ClassDao.java

package com.dao;
import com.util.DBUtil;
import com.bean.ClassBean;


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.tomcat.util.buf.StringUtils;



public class ClassDao {
    public static int testInsert(String classname,String teachname,String site) throws Exception//增加
    {
        int count = 0;
        Connection conn = DBUtil.getConn();
        try {
            String sql="insert into shangke values(?,?,?)";
            PreparedStatement preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, classname);
            preparedStatement.setString(2, teachname);
            preparedStatement.setString(3, site);
            count=preparedStatement.executeUpdate();
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    public static int testUpdate1(String xiugainame,String xiuname) throws Exception//修改
    {
        int count=0;
        Connection conn = DBUtil.getConn();
        try {
            String sql="update shangke set classname=? where classname=?";
            PreparedStatement preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, xiuname);
            preparedStatement.setString(2, xiugainame);
            count=preparedStatement.executeUpdate();
            System.out.println(count);
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    public static int testUpdate2(String xiugainame,String xiuteach) throws Exception//修改
    {
        int count=0;
        Connection conn = DBUtil.getConn();
        try {
            String sql="update shangke set teachname=? where classname=?";
            PreparedStatement preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, xiuteach);
            preparedStatement.setString(2, xiugainame);
            count=preparedStatement.executeUpdate();
            System.out.println(count);
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    public static int testUpdate3(String xiugainame,String xiusite) throws Exception//修改
    {
        int count=0;
        Connection conn = DBUtil.getConn();
        try {
            String sql="update shangke set site=? where classname=?";
            PreparedStatement preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, xiusite);
            preparedStatement.setString(2, xiugainame);
            count=preparedStatement.executeUpdate();
            System.out.println(count);
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    public int testDelete(String shanclass) throws Exception//删除
    {
        int count=0;
        Connection conn = DBUtil.getConn();
        try {
            String sql="delete from shangke where classname=?";
            PreparedStatement preparedStatement=conn.prepareStatement(sql);
            preparedStatement.setString(1, shanclass);
            count=preparedStatement.executeUpdate();
            System.out.println(count);
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        return count;
    }
    public static List<ClassBean> select(String name, String teacher, String place) {//查找
        List<ClassBean> beans = new ArrayList<ClassBean>();
        Connection conn = DBUtil.getConn();
        ClassBean adminBean=null;
        try {
            String sql="select * from shangke";
            Statement state = conn.createStatement();
            ResultSet rs = state.executeQuery(sql);
            while(rs.next()) {
                adminBean = new ClassBean();
                adminBean.setClassname(rs.getString("classname"));
                adminBean.setTeachname(rs.getString("teachname"));
                adminBean.setSite(rs.getString("site"));
                beans.add(adminBean);
            }
            
        
            conn.close();
        }catch (Exception e) {
            e.printStackTrace();
        }
        List<ClassBean> results = new ArrayList<ClassBean>();
        if(name!="")
        {
            Pattern pattern = Pattern.compile(name);
            for(int i=0;i<beans.size();i++)
            {
                Matcher matcher = pattern.matcher(((ClassBean)beans.get(i)).getClassname());
                if(matcher.find()){
                     results.add(beans.get(i));
                   }
            }
        }
        if(teacher!="")
        {
            Pattern pattern = Pattern.compile(teacher);
            for(int i=0;i<beans.size();i++)
            {
                Matcher matcher = pattern.matcher(((ClassBean)beans.get(i)).getTeachname());
                if(matcher.find()){
                     results.add(beans.get(i));
                   }
            }
        }
        if(place!="")
        {
            Pattern pattern = Pattern.compile(place);
            for(int i=0;i<beans.size();i++)
            {
                Matcher matcher = pattern.matcher(((ClassBean)beans.get(i)).getSite());
                if(matcher.find()){
                     results.add(beans.get(i));
                   }
            }
        }
        return results;
    }
}

(4)Servlet类，在com.servlet包中创建

ClassServlet.java,接受添加页面的信息

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 javax.swing.JOptionPane;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.bean.ClassBean;
import com.dao.ClassDao;
import com.util.DBUtil;
@WebServlet("/ClassServlet")
public class ClassServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    public ClassServlet() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String addclass=request.getParameter("addclass");
        String addteacher=request.getParameter("addteach");
        String addsite=request.getParameter("addsite");
        ClassBean admin=null;
        Connection conn = DBUtil.getConn();
        try {
                Statement state = conn.createStatement();
                String sql = "select * from shangke";
                ResultSet rs = state.executeQuery(sql);
                while(rs.next()) {
                    admin = new ClassBean();
                    admin.setClassname(rs.getString("classname"));
                    admin.setTeachname(rs.getString("teachname"));
                    admin.setSite(rs.getString("site"));
                    if(admin.getClassname().equals(addclass))
                    {
                        JOptionPane.showMessageDialog(null, "操作错误", "课程名称重复", JOptionPane.ERROR_MESSAGE);
                        request.getRequestDispatcher("add.jsp").forward(request, response);
                        return;
                    }
                }
                rs.close();
            conn.close();
    }catch (Exception e) {
        e.printStackTrace();
    }
        if(addteacher.equals("王建民")||addteacher.equals("刘立嘉")||addteacher.equals("刘丹")||addteacher.equals("王辉")||addteacher.equals("杨子光"))
        {
        }
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "没有这名教师", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("add.jsp").forward(request, response);
            return;
        }
        if(addsite.equals("一教")||addsite.equals("二教")||addsite.equals("三教")||addsite.equals("基教"))
        {}
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "上课地点错误", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("add.jsp").forward(request, response);
            return;
        }
        ClassDao admin1=new ClassDao();
        int n = 0;
        try {
            n = admin1.testInsert(addclass,addteacher,addsite);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(n!=0)
        {
             int res=JOptionPane.showConfirmDialog(null, "操作成功", "是否继续", JOptionPane.YES_NO_OPTION);
                             if(res==JOptionPane.YES_OPTION){ 
                                 request.getRequestDispatcher("jiemian.jsp").forward(request, response);   //点击“是”后执行这个代码块
                            }else{
                                  System.out.println("选择否后执行的代码");    //点击“否”后执行这个代码块
                                  return;
                              } 
        }
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "请重新操作", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("add.jsp").forward(request, response);
        }
    }

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

}

DeleteServlet.java,接受删除页面的信息

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 javax.swing.JOptionPane;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import com.bean.ClassBean;
import com.dao.ClassDao;
import com.util.DBUtil;
@WebServlet("/DeleteServlet")
public class DeleteServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public DeleteServlet() {
        super();
    }
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String DeleteClass=request.getParameter("Deleteclass");
        ClassBean admin1=null;
        ClassBean admin2=new ClassBean();
        ClassDao admin=new ClassDao();
        Connection conn = DBUtil.getConn();
        try {
                Statement state = conn.createStatement();
                String sql = "select * from shangke";
                ResultSet rs = state.executeQuery(sql);
                while(rs.next()) {
                    admin1 = new ClassBean();
                    admin1.setClassname(rs.getString("classname"));
                    admin1.setTeachname(rs.getString("teachname"));
                    admin1.setSite(rs.getString("site"));
                    if(admin1.getClassname().equals(DeleteClass))
                    {
                        admin2.setClassname(rs.getString("classname"));
                        admin2.setTeachname(rs.getString("teachname"));
                        admin2.setSite(rs.getString("site"));
                    }
                }
                rs.close();
            conn.close();
    }catch (Exception e) {
        e.printStackTrace();
    }
        int i=0;
        int res=JOptionPane.showConfirmDialog(null, "课程名称="+admin2.getClassname()+",任课教师="+admin2.getTeachname()+",上课地点="+admin2.getSite(), "是否删除", JOptionPane.YES_NO_OPTION);
        if(res==JOptionPane.YES_OPTION){ 
            try {
                i=admin.testDelete(DeleteClass);
            } catch (Exception e) {
                e.printStackTrace();
            }
            if(i!=0)
            {
                 int res1=JOptionPane.showConfirmDialog(null, "操作成功", "是否继续", JOptionPane.YES_NO_OPTION);
                                 if(res1==JOptionPane.YES_OPTION){ 
                                     request.getRequestDispatcher("jiemian.jsp").forward(request, response);   //点击“是”后执行这个代码块
                                }else{
                                    request.getRequestDispatcher("jieshu.jsp").forward(request, response);    //点击“否”后执行这个代码块
                                      return;
                                  } 
            }
            else
            {
                JOptionPane.showMessageDialog(null, "操作错误", "请重新操作", JOptionPane.ERROR_MESSAGE);
                request.getRequestDispatcher("Delete.jsp").forward(request, response);
            }
        }else{
            request.getRequestDispatcher("jiemian.jsp").forward(request, response);  //点击“否”后执行这个代码块
            return;
        }
        
        
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

AmendServlet.java,接受修改页面的信息

package com.servlet;

import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

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.swing.JOptionPane;

import com.bean.ClassBean;
import com.dao.ClassDao;
import com.util.DBUtil;


@WebServlet("/AmendServlet")
public class AmendServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    public AmendServlet() {
        super();
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String Amendclass=request.getParameter("Amendclass");
        String amendclass=request.getParameter("amendclass");
        String amendteacher=request.getParameter("amendteach");
        String amendsite=request.getParameter("amendsite");
        ClassBean admin=null;
        Connection conn = DBUtil.getConn();
        try {
                Statement state = conn.createStatement();
                String sql = "select * from shangke";
                ResultSet rs = state.executeQuery(sql);
                while(rs.next()) {
                    admin = new ClassBean();
                    admin.setClassname(rs.getString("classname"));
                    admin.setTeachname(rs.getString("teachname"));
                    admin.setSite(rs.getString("site"));
                    if(admin.getClassname().equals(amendclass)&&!amendclass.equals(Amendclass))
                    {
                        JOptionPane.showMessageDialog(null, "操作错误", "课程名称重复", JOptionPane.ERROR_MESSAGE);
                        request.getRequestDispatcher("Amend.jsp").forward(request, response);
                        return;
                    }
                }
                rs.close();
            conn.close();
    }catch (Exception e) {
        e.printStackTrace();
    }
        if(amendteacher.equals("王建民")||amendteacher.equals("刘立嘉")||amendteacher.equals("刘丹")||amendteacher.equals("王辉")||amendteacher.equals("杨子光"))
        {
        }
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "没有这名教师", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("Amend.jsp").forward(request, response);
            return;
        }
        if(amendsite.equals("一教")||amendsite.equals("二教")||amendsite.equals("三教")||amendsite.equals("基教"))
        {}
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "上课地点错误", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("Amend.jsp").forward(request, response);
            return;
        }
        ClassDao admin1=new ClassDao();
        int a1=0,a2=0,a3=0;
        try {
        a1=admin1.testUpdate1(Amendclass,amendclass);
        a2=admin1.testUpdate2(Amendclass,amendteacher);
        a3=admin1.testUpdate3(Amendclass,amendsite);
        }catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(a1!=0&&a2!=0&&a3!=0)
        {
            int res=JOptionPane.showConfirmDialog(null, "操作成功", "是否继续", JOptionPane.YES_NO_OPTION);
            if(res==JOptionPane.YES_OPTION){ 
                request.getRequestDispatcher("jiemian.jsp").forward(request, response);   //点击“是”后执行这个代码块
           }else{
                 System.out.println("选择否后执行的代码");    //点击“否”后执行这个代码块
                 return;
             } 
        }
        else
        {
            JOptionPane.showMessageDialog(null, "操作错误", "请重新操作", JOptionPane.ERROR_MESSAGE);
            request.getRequestDispatcher("Amend.jsp").forward(request, response);
        }
    }
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

（三）jsp层

jiemian.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form >
  <tr>
   <td>欢迎使用本系统</td>
  </tr>
  <tr>
   <td>请选择功能：</td>
  </tr>
  <tr>
   <td><a href="add.jsp">课程信息录入</a></td>
  </tr>
  <tr>
   <td><a href="Amend.jsp">课程信息修改</a></td>
  </tr>
  <tr>
  <td><a href="Delete.jsp">删除课程信息</a></td>
  </tr>
  <tr>
  <td><a href="Select.jsp">查询课程信息</a></td>
  </tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</body>
</html>

add.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form name = "form1"  action = "ClassServlet" method = "post">
<tr>
<td>课程名称:</td><td><input type="text" name="addclass" /></td>
</tr>
<tr>
<td>任课老师：</td><td><input type="text" name="addteach" /></td>
</tr>
<tr>
<td>上课地点：</td><td><input type="text" name="addsite" /></td>
</tr>
<tr>
<td><input name = "login" type = "submit" id = "login" value = "保存" class = "button"></td>
</tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</html>

Delete.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form name = "form3"  action = "DeleteServlet" method = "post">
<tr>
<td>要删除的课程的名称:</td><td><input type="text" name="Deleteclass" /></td>
</tr>
<tr>
<td><input name = "login" type = "submit" id = "login" value = "保存" class = "button"></td>
</tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</html>

Amend.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form name = "form2"  action = "AmendServlet" method = "post">
<tr>
<td>要修改课程的名称:</td><td><input type="text" name="Amendclass" /></td>
</tr>
<tr>
<td>改后课程名称:</td><td><input type="text" name="amendclass" /></td>
</tr>
<tr>
<td>任课老师：</td><td><input type="text" name="amendteach" /></td>
</tr>
<tr>
<td>上课地点：</td><td><input type="text" name="amendsite" /></td>
</tr>
<tr>
<td><input name = "login" type = "submit" id = "login" value = "保存" class = "button"></td>
</tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</html>

Select.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form name = "form4"  action = "jieshou.jsp" method = "post">
<tr>
<td>课程名称:</td><td><input type="text" name="Selectclass" /></td>
</tr>
<tr>
<td>任课老师：</td><td><input type="text" name="Selectteach" /></td>
</tr>
<tr>
<td>上课地点：</td><td><input type="text" name="Selectsite" /></td>
</tr>
<tr>
<td><input name = "login" type = "submit" id = "login" value = "提交" class = "button"></td>
</tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</html>

jieshou.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
      pageEncoding="UTF-8"%>
      <%@page import="java.util.List" %>
      <%@page import="com.bean.ClassBean" %>
      <%@page import="com.dao.ClassDao" %>
<!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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form >
  <tr>
   <td>欢迎使用本系统</td>
  </tr>
  <tr>
  <%
    request.setCharacterEncoding("UTF-8");
    String Selectclass=request.getParameter("Selectclass");
    String Selectteacher=request.getParameter("Selectteach");
    String Selectsite=request.getParameter("Selectsite");
    ClassBean c=null;
    List<ClassBean> beans = ClassDao.select(Selectclass, Selectteacher, Selectsite);
    for(int i=0;i<beans.size();i++)
    {
        c=beans.get(i);
        out.println("</br>");
        out.println("课程名称="+c.getClassname()+",任课老师="+c.getTeachname()+",上课地点="+c.getSite());
    }
  %>
  </tr>
  <tr>
  <td><a href="jiemian.jsp">返回</a></td>
  </tr>
  <tr>
  <td><a href="jieshu.jsp">结束</a></td>
  </tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</body>
</html>

jieshu.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">
<title>登录界面</title>
</head>
<body>
<table width = "400" border ="0" height = "300" align = "center" cellpading ="0" style = "font-size:12px;color:#FFFFF;front-weight:bold">
<Tr height = "50" ><td>&nbsp;</td></Tr>
<tr>
   <td height = "200"><table width = "98%" border ="0" align = "center" cellpading = "0">
   <form >
  <tr>
   <td>欢迎使用本系统</td>
  </tr>
  <tr>
   <td>欢迎再次使用</td>
  </tr>
 </form>
 </table>
 </td>
 </tr>
</table>
</body>
</html>

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