SSM framework online exam website-online exam system (idea developed javaweb-javaee-j2ee-springboot) automatic handover-countdown

0. Effect display

1 Overview

 

 

2. Build the environment

 

This article aims to realize an online online examination website, and describes the whole process from environment construction to coding implementation.

We use javaweb and J2EE to build the online exam website, the environment uses the latest version of jdk and tomcat, and cooperates with the mysql database

The development tool uses idea (you can also use eclipse), and the database management tool uses Navicat Premium 

The development framework uses the JavaBean Servlet MVC structure;

We do not use SSH (Struts+Spring+Hibernate) or SSM (Spring+SpringMVC+MyBatis), these two frameworks will introduce the development process in other projects

 

In the project, My97DatePicker will be introduced as a front-end date and time selection tool, and fckeditor will be used as a rich media editor (you can also use Baidu's ueditor)

 

 

Use DWR (Direct Web Remoting) to improve the interaction between web pages and Java classes, and realize remote server-side AJAX reading of login data.

Use JSTL (Java server pages standardized tag library, that is, JSP standard tag library), this library is a standard specification formulated by JCP (Java community Proces), it mainly provides Java Web developers with a standard and general tag library, and is provided by JCP (Java community Proces). Apache's Jakarta team to maintain. Developers can use these tags to replace the Java code on the JSP page, thereby improving the readability of the program and reducing the difficulty of program maintenance.

 

3. Data table structure

 

Table 4.3 t_chengji score table

Field Name	auto grow	Field Type	illustrate
id	-	int	serial number
stu_id	-	int	student number
kecheng_id	-	int	Course No
chengji	-	double	score
seat	-	varchar	Whether to test
shijian	-	varchar	time
the	-	varchar	delete or not

Table 4.4 t_liuyan message form

name	Types of	illustrate
id	int(11)	serial number
title	text	title
content	text	content
shijian	text	time
name	text	message person name

4. Back-end code example

 

package com.action;

import java.io.IOException;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.dao.DB; 
import com.orm.Tstu;
import com.orm.Ttimu;
import com.orm.Ttimu;
import com.orm.Ttimustu;
import com.service.liuService;

public class timu_servlet extends HttpServlet
{
	public void service(HttpServletRequest req,HttpServletResponse res)throws ServletException, IOException 
	{
        String type=req.getParameter("type");
		
		
		if(type.endsWith("timuAdd1"))
		{
			timuAdd1(req, res);//单选
		}
		if(type.endsWith("timuAdd2"))
		{
			timuAdd2(req, res);//多选
		}
		if(type.endsWith("timuAdd3"))
		{
			timuAdd3(req, res);//判断
		}
		if(type.endsWith("timuCreate1"))
		{
			timuCreate1(req, res);
		}
		if(type.endsWith("timuCreate2"))
		{
			timuCreate2(req, res);
		}
		if(type.endsWith("timuCreate3"))
		{
			timuCreate3(req, res);
		}
		if(type.endsWith("timuDetail"))
		{
			timuDetail(req, res);
		}
		if(type.endsWith("timuMana1"))
		{
			timuMana1(req, res);
		}
		if(type.endsWith("timuMana2"))
		{
			timuMana2(req, res);
		}
		if(type.endsWith("timuMana3"))
		{
			timuMana3(req, res);
		}
		if(type.endsWith("timuDel1"))
		{
			timuDel1(req, res);
		}
		if(type.endsWith("timuDel2"))
		{
			timuDel2(req, res);
		}
		if(type.endsWith("timuDel3"))
		{
			timuDel3(req, res);
		}
		
		
		//在线考试
		if(type.endsWith("timuSuiji"))
		{
			timuSuiji(req, res);
		}
		
		//在线测试
		if(type.endsWith("timuSuijicheshi"))
		{
			timuSuijicheshi(req, res);
		}
		
		//得分计算,错题保存 成绩保存
		if(type.endsWith("timuSuiji_defen"))
		{
			timuSuiji_defen(req, res);
		}
		
		
		if(type.endsWith("timu_stu"))
		{
			timu_stu(req, res);
		}
		
		//题目收藏
		if(type.endsWith("timu_stuSave"))
		{
			timu_stuSave(req, res);
		}
		if(type.endsWith("timu_stuDel"))
		{
			timu_stuDel(req, res);
		}
		
		
		if(type.endsWith("timustuDetail"))
		{
			timustuDetail(req, res);
		}
		
		
	}
	
	
	public void timuAdd1(HttpServletRequest req,HttpServletResponse res)
	{
		String name=req.getParameter("name");
		String xuanxianga=req.getParameter("xuanxianga");
		String xuanxiangb=req.getParameter("xuanxiangb");
		String zhangjie_id=req.getParameter("zhangjie_id");
		String xuanxiangc=req.getParameter("xuanxiangc");
		String xuanxiangd=req.getParameter("xuanxiangd");
		String daan=req.getParameter("daan");
		//int fenshu=Integer.parseInt(req.getParameter("fenshu"));
		String del="no";
		
		String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
		Object[] params={null,name,xuanxianga,xuanxiangb,xuanxiangc,xuanxiangd,daan,"0.5",del,"1",zhangjie_id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana1");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	public void timuAdd2(HttpServletRequest req,HttpServletResponse res)
	{
		String name=req.getParameter("name");
		String xuanxianga=req.getParameter("xuanxianga");
		String xuanxiangb=req.getParameter("xuanxiangb");
		String zhangjie_id=req.getParameter("zhangjie_id");
		String xuanxiangc=req.getParameter("xuanxiangc");
		String xuanxiangd=req.getParameter("xuanxiangd");
		String[] daan1=req.getParameterValues("daan");
		String daan="";
		for (int i = 0; i < daan1.length; i++) {   
			daan += daan1[i] + ",";   
			}   
		daan=daan.replaceAll("(.*),","$1");   //清除掉右侧多余的空格
		//int fenshu=Integer.parseInt(req.getParameter("fenshu"));
		String del="no";
		
		String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
		Object[] params={null,name,xuanxianga,xuanxiangb,xuanxiangc,xuanxiangd,daan,"1",del,"2",zhangjie_id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana2");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	public void timuAdd3(HttpServletRequest req,HttpServletResponse res)
	{
		String name=req.getParameter("name");
		String daan=req.getParameter("daan");
		String zhangjie_id=req.getParameter("zhangjie_id");
	//int fenshu=Integer.parseInt(req.getParameter("fenshu"));
		String del="no";
		
		String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
		Object[] params={null,name,"","","","",daan,"1",del,"3",zhangjie_id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana3");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	//随机生成单选 试题数据保存入数据库
	public void timuCreate1(HttpServletRequest req,HttpServletResponse res)
	{
		
		for(int i=1;i<1001;i++)
		{
			
			int numb1000=new Random().nextInt(1000)+1;
			String name="单选题目 "+i;
			String xuanxianga="答案A "+numb1000;
			String xuanxiangb="答案B "+numb1000;
			int zhangjie_id=new Random().nextInt(10)+1;
			
			
			String xuanxiangc="答案C "+numb1000;
			String xuanxiangd="答案D "+numb1000;
			
			int numb1=new Random().nextInt(4)+1;
			String daan1="A";
			if(numb1==1) daan1="A";
            if(numb1==2) daan1="B";
            if(numb1==3) daan1="C";
            if(numb1==4) daan1="D";
			String daan=daan1;
			
			//分数
			String fenshu="0.5";
			String del="no";
			
			String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
			Object[] params={null,name,xuanxianga,xuanxiangb,xuanxiangc,xuanxiangd,daan,fenshu,del,"1",zhangjie_id};
			DB mydb=new DB();
			mydb.doPstm(sql, params);
			mydb.closed();
		}
		
		
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana1");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	
	//随机生成多选 试题数据保存入数据库
	public void timuCreate2(HttpServletRequest req,HttpServletResponse res)
	{
		
		for(int i=1;i<1001;i++)
		{
			
			int numb1000=new Random().nextInt(1000)+1;
			String name="多选题目 "+i;
			String xuanxianga="答案A "+numb1000;
			String xuanxiangb="答案B "+numb1000;
			int zhangjie_id=new Random().nextInt(10)+1;
			
			
			String xuanxiangc="答案C "+numb1000;
			String xuanxiangd="答案D "+numb1000;
			
			int numb1=new Random().nextInt(4)+1;
			String daan1="A";
			if(numb1==1) daan1="A,B";
            if(numb1==2) daan1="B,C";
            if(numb1==3) daan1="C,D";
            if(numb1==4) daan1="A,B,C,D";
			String daan=daan1;
			
			//分数
			int fenshu=1;
			String del="no";
			
			String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
			Object[] params={null,name,xuanxianga,xuanxiangb,xuanxiangc,xuanxiangd,daan,fenshu,del,"2",zhangjie_id};
			DB mydb=new DB();
			mydb.doPstm(sql, params);
			mydb.closed();
		}
		
		
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana2");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	
	//随机生成判断 试题数据保存入数据库
	public void timuCreate3(HttpServletRequest req,HttpServletResponse res)
	{
		
		for(int i=1;i<1001;i++)
		{
			
			int numb1000=new Random().nextInt(1000)+1;
			String name="判断题目 "+i;
			String xuanxianga="判断题内容 "+numb1000;
			String xuanxiangb=" ";
			int zhangjie_id=new Random().nextInt(10)+1;
			
			
			String xuanxiangc=" ";
			String xuanxiangd=" ";
			
			int numb1=new Random().nextInt(2)+1;
			String daan1="A";
			if(numb1==1) daan1="正确";
            if(numb1==2) daan1="错误";
			String daan=daan1;
			
			//分数
			int fenshu=1;
			String del="no";
			
			String sql="insert into t_timu values(?,?,?,?,?,?,?,?,?,?,?)";
			Object[] params={null,name,xuanxianga,xuanxiangb,xuanxiangc,xuanxiangd,daan,fenshu,del,"3",zhangjie_id};
			DB mydb=new DB();
			mydb.doPstm(sql, params);
			mydb.closed();
		}
		
		
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana3");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
        
	}
	
	
	public void timuDel1(HttpServletRequest req,HttpServletResponse res)
	{
		int id=Integer.parseInt(req.getParameter("id"));
		
		String sql="update t_timu set del='yes' where id=?";
		Object[] params={id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana1");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
	}
	

	public void timuDel2(HttpServletRequest req,HttpServletResponse res)
	{
		int id=Integer.parseInt(req.getParameter("id"));
		
		String sql="update t_timu set del='yes' where id=?";
		Object[] params={id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana2");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
	}
	

	public void timuDel3(HttpServletRequest req,HttpServletResponse res)
	{
		int id=Integer.parseInt(req.getParameter("id"));
		
		String sql="update t_timu set del='yes' where id=?";
		Object[] params={id};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timuMana3");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
	}
	

	public void timuMana1(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{

		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
        int stuid=stu.getId();//当前登录的用户的ID
	
		

		String page1=req.getParameter("page");
		if(page1==null){
			page1="1";
		}
		//分页设置
		int EVERYPAGENUM=20;//每页条数
		int page=Integer.parseInt(page1);   //传递过来的当前页
		int cou = 1;//得到信息总数	
		int pagecount=1;  //总页数
		String sql1="select count(*) as cou from t_timu where del='no' and type='1'" +
		" and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
		if(req.getParameter("name")!=null)sql1+=" and name like '%"+req.getParameter("name").trim()+"%'";
		Object[] params1={};
		DB mydb1=new DB();
		try
		{
			mydb1.doPstm(sql1, params1);
			ResultSet rs=mydb1.getRs();
			while(rs.next())
			{
			cou= rs.getInt("cou");
			}
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb1.closed();
		
		
		
		if (cou % EVERYPAGENUM == 0) {
			pagecount= cou / EVERYPAGENUM;
        } else {
        	pagecount=cou / EVERYPAGENUM + 1;
        }	
		
		
		
		
		
		
		req.setAttribute("EVERYPAGENUM", EVERYPAGENUM);	
		req.setAttribute("page", page);
		req.setAttribute("cou", cou);
		req.setAttribute("pagecount", pagecount);
		
		
		
		
		
		
		List timuList=new ArrayList();
		String sql="select * from t_timu where del='no'  and type='1' " +
				 " and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
		if(req.getParameter("name")!=null)sql+=" and name like '%"+req.getParameter("name").trim()+"%'";
		sql+=" order by id desc";
		Object[] params={};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			 for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
	                rs.next();
	            }
	            for (int t = 0; t < EVERYPAGENUM; t++) {
	                if (rs.next()) {
				Ttimu timu=new Ttimu();
				
				timu.setId(rs.getInt("id"));
				timu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timu.setName(rs.getString("name"));
				timu.setXuanxianga(rs.getString("xuanxianga"));
				timu.setXuanxiangb(rs.getString("xuanxiangb"));
				
				timu.setXuanxiangc(rs.getString("xuanxiangc"));
				timu.setXuanxiangd(rs.getString("xuanxiangd"));
				timu.setDaan(rs.getString("daan"));
				timu.setFenshu(rs.getInt("fenshu"));
				
				
				timuList.add(timu);
	                } else {
	                    break; //减少空循环的时间
	                }
	            }
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		req.setAttribute("timuList", timuList);
		req.getRequestDispatcher("tea/timu/timuMana1.jsp").forward(req, res);
	}
	public void timuMana2(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{

		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
        int stuid=stu.getId();//当前登录的用户的ID
	
	
		String page1=req.getParameter("page");
		if(page1==null){
			page1="1";
		}
		//分页设置
		int EVERYPAGENUM=20;//每页条数
		int page=Integer.parseInt(page1);   //传递过来的当前页
		int cou = 1;//得到信息总数	
		int pagecount=1;  //总页数
		String sql1="select count(*) as cou from t_timu where del='no' and type='2'" +
		 " and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
				if(req.getParameter("name")!=null)sql1+=" and name like '%"+req.getParameter("name").trim()+"%'";
		Object[] params1={};
		DB mydb1=new DB();
		try
		{
			mydb1.doPstm(sql1, params1);
			ResultSet rs=mydb1.getRs();
			while(rs.next())
			{
			cou= rs.getInt("cou");
			}
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb1.closed();
		
		
		
		if (cou % EVERYPAGENUM == 0) {
			pagecount= cou / EVERYPAGENUM;
        } else {
        	pagecount=cou / EVERYPAGENUM + 1;
        }	
		
		
		
		
		
		
		req.setAttribute("EVERYPAGENUM", EVERYPAGENUM);	
		req.setAttribute("page", page);
		req.setAttribute("cou", cou);
		req.setAttribute("pagecount", pagecount);
		
		
		
		
		
		
		List timuList=new ArrayList();
		String sql="select * from t_timu where del='no'  and type='2' " +
		 " and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
				if(req.getParameter("name")!=null)sql+=" and name like '%"+req.getParameter("name").trim()+"%'";
		sql+=" order by id desc";
		Object[] params={};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			 for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
	                rs.next();
	            }
	            for (int t = 0; t < EVERYPAGENUM; t++) {
	                if (rs.next()) {
				Ttimu timu=new Ttimu();
				
				timu.setId(rs.getInt("id"));
				timu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timu.setName(rs.getString("name"));
				timu.setXuanxianga(rs.getString("xuanxianga"));
				timu.setXuanxiangb(rs.getString("xuanxiangb"));
				
				timu.setXuanxiangc(rs.getString("xuanxiangc"));
				timu.setXuanxiangd(rs.getString("xuanxiangd"));
				timu.setDaan(rs.getString("daan"));
				timu.setFenshu(rs.getInt("fenshu"));
				
				
				timuList.add(timu);
	                } else {
	                    break; //减少空循环的时间
	                }
	            }
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		req.setAttribute("timuList", timuList);
		req.getRequestDispatcher("tea/timu/timuMana2.jsp").forward(req, res);
	}
	public void timuMana3(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{

		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
        int stuid=stu.getId();//当前登录的用户的ID
	
	
		String page1=req.getParameter("page");
		if(page1==null){
			page1="1";
		}
		//分页设置
		int EVERYPAGENUM=20;//每页条数
		int page=Integer.parseInt(page1);   //传递过来的当前页
		int cou = 1;//得到信息总数	
		int pagecount=1;  //总页数
		String sql1="select count(*) as cou from t_timu where del='no' and type='3'" +
		 " and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
				if(req.getParameter("name")!=null)sql1+=" and name like '%"+req.getParameter("name").trim()+"%'";
		Object[] params1={};
		DB mydb1=new DB();
		try
		{
			mydb1.doPstm(sql1, params1);
			ResultSet rs=mydb1.getRs();
			while(rs.next())
			{
			cou= rs.getInt("cou");
			}
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb1.closed();
		
		
		
		if (cou % EVERYPAGENUM == 0) {
			pagecount= cou / EVERYPAGENUM;
        } else {
        	pagecount=cou / EVERYPAGENUM + 1;
        }	
		
		
		
		
		
		
		req.setAttribute("EVERYPAGENUM", EVERYPAGENUM);	
		req.setAttribute("page", page);
		req.setAttribute("cou", cou);
		req.setAttribute("pagecount", pagecount);
		
		
		
		
		
		
		List timuList=new ArrayList();
		String sql="select * from t_timu where del='no'  and type='3' " +
		 " and   zhangjie_id in (select id from t_zhangjie where del='no' and kecheng_id in (select id from t_kecheng where del='no' and stu_id="+stuid+")) ";
	if(req.getParameter("name")!=null)sql+=" and name like '%"+req.getParameter("name").trim()+"%'";
		sql+=" order by id desc";
		Object[] params={};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			 for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
	                rs.next();
	            }
	            for (int t = 0; t < EVERYPAGENUM; t++) {
	                if (rs.next()) {
				Ttimu timu=new Ttimu();
				
				timu.setId(rs.getInt("id"));
				timu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timu.setName(rs.getString("name"));
				timu.setXuanxianga(rs.getString("xuanxianga"));
				timu.setXuanxiangb(rs.getString("xuanxiangb"));
				
				timu.setXuanxiangc(rs.getString("xuanxiangc"));
				timu.setXuanxiangd(rs.getString("xuanxiangd"));
				timu.setDaan(rs.getString("daan"));
				timu.setFenshu(rs.getInt("fenshu"));
				
				
				timuList.add(timu);
	                } else {
	                    break; //减少空循环的时间
	                }
	            }
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		req.setAttribute("timuList", timuList);
		req.getRequestDispatcher("tea/timu/timuMana3.jsp").forward(req, res);
	}
	



	//在线考试
	public void timuSuiji(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
		int kecheng_id= Integer.parseInt( req.getParameter("kecheng_id"));
		 List<Integer> timu_idList1=liuService.getAllTimuId(kecheng_id,1);  //所有单选题
		 List<Integer> timu_idList2=liuService.getAllTimuId(kecheng_id,2);  //所有多选题
		 List<Integer> timu_idList3=liuService.getAllTimuId(kecheng_id,3);  //所有判断选题
		
		int[] timu_id1=liuService.Random(timu_idList1, 90);//随机抽取不同的90个题目的id 单选题 
		List timuList1=new ArrayList();
		for(int i=0;i<timu_id1.length;i++)
		{
			timuList1.add(liuService.getTimuById(timu_id1[i]));
		}
		
		req.getSession().setAttribute("timuList1", timuList1);
		
		
		int[] timu_id2=liuService.Random(timu_idList2, 40);//随机抽取不同的4个题目的id 多选题 
		List timuList2=new ArrayList();
		for(int i=0;i<timu_id2.length;i++)
		{
			timuList2.add(liuService.getTimuById(timu_id2[i]));
		}
		req.getSession().setAttribute("timuList2", timuList2);
		
		
		int[] timu_id3=liuService.Random(timu_idList3, 15);//随机抽取不同的15个题目的id 判断题 
		List timuList3=new ArrayList();
		for(int i=0;i<timu_id3.length;i++)
		{
			timuList3.add(liuService.getTimuById(timu_id3[i]));
		}
		req.getSession().setAttribute("timuList3", timuList3);
		
		
		
		
		req.getSession().setAttribute("kecheng_id", kecheng_id);
		req.getRequestDispatcher("qiantai/timu/timuSuiji.jsp").forward(req, res);
	}
	
	//测试
	public void timuSuijicheshi(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
 		int kecheng_id=Integer.parseInt(req.getParameter("kecheng_id"));
		int isdaan=Integer.parseInt(req.getParameter("isdaan"));
		 List<Integer> timu_idList1=liuService.getAllTimuId(kecheng_id,1);  //所有单选题
		 List<Integer> timu_idList2=liuService.getAllTimuId(kecheng_id,2);  //所有多选题
		 List<Integer> timu_idList3=liuService.getAllTimuId(kecheng_id,3);  //所有判断选题
		
		int[] timu_id1=liuService.Random(timu_idList1, 90);//随机抽取不同的90个题目的id 单选题 
		List timuList1=new ArrayList();
		for(int i=0;i<timu_id1.length;i++)
		{
			timuList1.add(liuService.getTimuById(timu_id1[i]));
		}
		
		req.getSession().setAttribute("timuList1", timuList1);
		
		
		int[] timu_id2=liuService.Random(timu_idList2, 40);//随机抽取不同的4个题目的id 多选题 
		List timuList2=new ArrayList();
		for(int i=0;i<timu_id2.length;i++)
		{
			timuList2.add(liuService.getTimuById(timu_id2[i]));
		}
		req.getSession().setAttribute("timuList2", timuList2);
		
		
		int[] timu_id3=liuService.Random(timu_idList3, 15);//随机抽取不同的15个题目的id 判断题 
		List timuList3=new ArrayList();
		for(int i=0;i<timu_id3.length;i++)
		{
			timuList3.add(liuService.getTimuById(timu_id3[i]));
		}
		req.getSession().setAttribute("timuList3", timuList3);
		
		
		
		req.getSession().setAttribute("kecheng_id", kecheng_id);
		req.getSession().setAttribute("isdaan", isdaan);
		req.getRequestDispatcher("qiantai/timu/timuSuijicheshi.jsp").forward(req, res);
	}
	
	
	public void timuSuiji_defen(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
        int fenshu=0;
        int truenumb=0;
        int falsenumb=0;
		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
		int stuid=stu.getId();//当前登录的用户的ID
		String shijian=new Date().toLocaleString();
			
			
		//单选题判断	
		List timuList1=(List)req.getSession().getAttribute("timuList1");
		for(int i=0;i<timuList1.size();i++)
		{
			Ttimu timu=(Ttimu)timuList1.get(i);
			String timuDaan=timu.getDaan();
			String timuDaan_user=req.getParameter(String.valueOf(timu.getId()));
			if(timuDaan.equalsIgnoreCase(timuDaan_user))
			{
				fenshu+=timu.getFenshu();//正确得分累加
				truenumb++;
			}else
			{//将错存入 我的题目
				    falsenumb++;
					int timuid=timu.getId();
					String sql="select * from t_timu_stu where stu_id="+stuid+" and timu_id="+timuid;
					Object[] params={};
					DB mydb=new DB();
					try
					{
						mydb.doPstm(sql, params);
						ResultSet rs=mydb.getRs();
							if(rs.next())
						{//如果有此记录  则更新
							String sql1="update t_timu_stu set isfalse='错题',shijian='"+shijian+"' where stu_id='"+stuid+"' and timu_id="+timuid;
							Object[] params1={};
							DB mydb1=new DB();
							mydb1.doPstm(sql1, params1);
							mydb1.closed();
						}else
						{
							//无此记录则添加
							String sql2="insert into t_timu_stu values(?,?,?,?,?)";
							Object[] params2={null,stuid,timuid,"错题",shijian};
							DB mydb2=new DB();
							mydb2.doPstm(sql2, params2);
							mydb2.closed();
						}
						rs.close();
					}
					catch(Exception e)
					{
						e.printStackTrace();
					}
			}
		}
		
	
	
	
	
		//多选题判断	
		List timuList2=(List)req.getSession().getAttribute("timuList2");
		for(int i=0;i<timuList2.size();i++)
		{
			Ttimu timu=(Ttimu)timuList2.get(i);
			String timuDaan=timu.getDaan();
			String timuDaan_user=req.getParameter(String.valueOf(timu.getId()));
			if(timuDaan.equalsIgnoreCase(timuDaan_user))
			{
				fenshu+=timu.getFenshu();//正确得分累加
				truenumb++;
			}else
			{//将错存入 我的题目
				    falsenumb++;
					int timuid=timu.getId();
					String sql="select * from t_timu_stu where stu_id="+stuid+" and timu_id="+timuid;
					Object[] params={};
					DB mydb=new DB();
					try
					{
						mydb.doPstm(sql, params);
						ResultSet rs=mydb.getRs();
							if(rs.next())
						{//如果有此记录  则更新
							String sql1="update t_timu_stu set isfalse='错题',shijian='"+shijian+"' where stu_id='"+stuid+"' and timu_id="+timuid;
							Object[] params1={};
							DB mydb1=new DB();
							mydb1.doPstm(sql1, params1);
							mydb1.closed();
						}else
						{
							//无此记录则添加
							String sql2="insert into t_timu_stu values(?,?,?,?,?)";
							Object[] params2={null,stuid,timuid,"错题",shijian};
							DB mydb2=new DB();
							mydb2.doPstm(sql2, params2);
							mydb2.closed();
						}
						rs.close();
					}
					catch(Exception e)
					{
						e.printStackTrace();
					}
			}
		}
		
	
	
		//判断题判断	
		List timuList3=(List)req.getSession().getAttribute("timuList3");
		for(int i=0;i<timuList3.size();i++)
		{
			Ttimu timu=(Ttimu)timuList3.get(i);
			String timuDaan=timu.getDaan();
			String timuDaan_user=req.getParameter(String.valueOf(timu.getId()));
			if(timuDaan.equalsIgnoreCase(timuDaan_user))
			{
				fenshu+=timu.getFenshu();//正确得分累加
				truenumb++;
			}else
			{//将错存入 我的题目
				    falsenumb++;
					int timuid=timu.getId();
					String sql="select * from t_timu_stu where stu_id="+stuid+" and timu_id="+timuid;
					Object[] params={};
					DB mydb=new DB();
					try
					{
						mydb.doPstm(sql, params);
						ResultSet rs=mydb.getRs();
							if(rs.next())
						{//如果有此记录  则更新
							String sql1="update t_timu_stu set isfalse='错题',shijian='"+shijian+"' where stu_id='"+stuid+"' and timu_id="+timuid;
							Object[] params1={};
							DB mydb1=new DB();
							mydb1.doPstm(sql1, params1);
							mydb1.closed();
						}else
						{
							//无此记录则添加
							String sql2="insert into t_timu_stu values(?,?,?,?,?)";
							Object[] params2={null,stuid,timuid,"错题",shijian};
							DB mydb2=new DB();
							mydb2.doPstm(sql2, params2);
							mydb2.closed();
						}
						rs.close();
					}
					catch(Exception e)
					{
						e.printStackTrace();
					}
			}
		}
		
	
	
	
	
	
	
	
	
	
		
		//保存成绩
		String sql3="insert into t_chengji values(?,?,?,?,?,?,?)";
		Object[] params3={null,stuid,req.getParameter("kecheng_id"),fenshu,req.getParameter("istest"),shijian,"no"};
		DB mydb3=new DB();
		mydb3.doPstm(sql3, params3);
		mydb3.closed();
		
		
		
		req.setAttribute("message", "本次测试得分："+fenshu+" 正确:"+truenumb+" 错误:"+falsenumb+" 错误题目已经保存入'我的题目'");
		req.setAttribute("path", "qiantai/default.jsp");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
		
	}
	public void timuDetail(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
		String id=req.getParameter("id");
		
		Ttimu timu=new Ttimu();
		String sql="select * from t_timu where id=?";
		Object[] params={id};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			rs.next();
			timu.setId(rs.getInt("id"));
				timu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timu.setName(rs.getString("name"));
				timu.setXuanxianga(rs.getString("xuanxianga"));
				timu.setXuanxiangb(rs.getString("xuanxiangb"));
				
				timu.setXuanxiangc(rs.getString("xuanxiangc"));
				timu.setXuanxiangd(rs.getString("xuanxiangd"));
				timu.setDaan(rs.getString("daan"));
				timu.setFenshu(rs.getInt("fenshu"));
				
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		req.setAttribute("timu", timu);
		req.getRequestDispatcher("admin/timu/timuDetail.jsp").forward(req, res);
	}

	
	
	
	//前台用户查看题目详情
	public void timustuDetail(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
		String id=req.getParameter("id");
		int timutype=0;   //用于判断跳转页面,单选题和多选一样,判断题另一个页面
		Ttimu timu=new Ttimu();
		String sql="select * from t_timu where id=?";
		Object[] params={id};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			rs.next();
			timu.setId(rs.getInt("id"));
				timu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timu.setName(rs.getString("name"));
				timu.setXuanxianga(rs.getString("xuanxianga"));
				timu.setXuanxiangb(rs.getString("xuanxiangb"));
				
				timu.setXuanxiangc(rs.getString("xuanxiangc"));
				timu.setXuanxiangd(rs.getString("xuanxiangd"));
				timu.setDaan(rs.getString("daan"));
				timu.setFenshu(rs.getInt("fenshu"));
				timutype=rs.getInt("type");
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		String jumpurl="qiantai/timustu/timuDetail.jsp";
		if(timutype==3)jumpurl="qiantai/timustu/timuDetail3.jsp";
		req.setAttribute("timu", timu);
		req.getRequestDispatcher(jumpurl).forward(req, res);
	}







	//用户收藏题目删除
	public void timu_stuDel(HttpServletRequest req,HttpServletResponse res)
	{
		String sql="DELETE FROM `t_timu_stu` WHERE (`id`='"+Integer.parseInt(req.getParameter("id"))+"')";
		Object[] params={};
		DB mydb=new DB();
		mydb.doPstm(sql, params);
		mydb.closed();
		
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "timu?type=timu_stu");
		
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
	}
	
	
	
	
	
	
	//用户收藏题目保存
	public void timu_stuSave(HttpServletRequest req,HttpServletResponse res)
	{
		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
        int stuid=stu.getId();//当前登录的用户的ID
		String shijian=new Date().toLocaleString();
		String timuid=req.getParameter("timuid");
		
		
		List timustuList=new ArrayList();
		String sql="select * from t_timu_stu where stu_id="+stuid+" and timu_id="+timuid;
		Object[] params={};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
				if(rs.next())
				{//如果有此记录  则更新
					String sql1="update t_timu_stu set isfalse='收藏',shijian='"+shijian+"' where stu_id='"+stuid+"' and timu_id="+timuid;
					Object[] params1={};
					DB mydb1=new DB();
					mydb1.doPstm(sql1, params1);
					mydb1.closed();
				}else
				{
					
					//无此记录则添加
					String sql2="insert into t_timu_stu values(?,?,?,?,?)";
					Object[] params2={null,stuid,timuid,"收藏",shijian};
					DB mydb2=new DB();
					mydb2.doPstm(sql2, params2);
					mydb2.closed();
					
				}
			rs.close();
		}
		catch(Exception e)
		{
			
			
			
			
			
			e.printStackTrace();
		}
			
		req.setAttribute("message", "操作成功");
		req.setAttribute("path", "index");
        String targetURL = "/common/success.jsp";
		dispatch(targetURL, req, res);
		}

	

		//前台用户收藏题目
	public void timu_stu(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{

		HttpSession session=req.getSession();
		Tstu stu=(Tstu)session.getAttribute("stu");
        
		
/*		if(stu==null){
			 String targetURL = "/common/nologin.jsp";
			 req.getRequestDispatcher(targetURL).forward(req, res);
        	
        }
*/		int stuid=stu.getId();//当前登录的用户的ID
		
		String page1=req.getParameter("page");
		if(page1==null){
			page1="1";
		}
		//分页设置
		int EVERYPAGENUM=20;//每页条数
		int page=Integer.parseInt(page1);   //传递过来的当前页
		int cou = 1;//得到信息总数	
		int pagecount=1;  //总页数
		String sql1="select count(*) as cou from t_timu_stu where stu_id="+stuid+"";
		Object[] params1={};
		DB mydb1=new DB();
		try
		{
			mydb1.doPstm(sql1, params1);
			ResultSet rs=mydb1.getRs();
			while(rs.next())
			{
			cou= rs.getInt("cou");
			}
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb1.closed();
		
		
		
		if (cou % EVERYPAGENUM == 0) {
			pagecount= cou / EVERYPAGENUM;
        } else {
        	pagecount=cou / EVERYPAGENUM + 1;
        }	
		
		req.setAttribute("EVERYPAGENUM", EVERYPAGENUM);	
		req.setAttribute("page", page);
		req.setAttribute("cou", cou);
		req.setAttribute("pagecount", pagecount);
		









		
		List timustuList=new ArrayList();
		String sql="select t_timu_stu.*," +
				"t_stu.name1 as stu_name," +
				"t_timu.name timu_name," +
				"t_timu.zhangjie_id zhangjie_id from t_timu_stu " +
				" left join t_stu on t_stu.id=t_timu_stu.stu_id " +
				" left join t_timu on t_timu.id=t_timu_stu.timu_id " +
				" left join t_zhangjie on t_zhangjie.id=t_timu.zhangjie_id" +
				" left join t_kecheng on t_kecheng.id=t_zhangjie.kecheng_id " +
							"where t_timu_stu.stu_id=? " ;
		
		if(req.getParameter("kecheng_id")!=null&&!req.getParameter("kecheng_id").equals("0"))sql+=" and t_kecheng.id = '"+req.getParameter("kecheng_id").trim()+"'";
	     						
		sql+="order by id desc";
		Object[] params={stuid};
		DB mydb=new DB();
		try
		{
			mydb.doPstm(sql, params);
			ResultSet rs=mydb.getRs();
			 for (int i = 0; i < (page - 1) * EVERYPAGENUM; i++) {
	                rs.next();
	            }
	            for (int t = 0; t < EVERYPAGENUM; t++) {
	                if (rs.next()) {
				Ttimustu timustu=new Ttimustu();

				timustu.setId(rs.getInt("id"));
				timustu.setStu_id(rs.getInt("stu_id"));
				timustu.setStu_name(rs.getString("stu_name"));
				timustu.setZhangjie_id(rs.getInt("zhangjie_id"));
				timustu.setZhangjie_name(liuService.getZhangjieName(rs.getInt("zhangjie_id")));
				timustu.setTimu_id(rs.getInt("timu_id"));
				timustu.setTimu_name(rs.getString("timu_name"));
				timustu.setIsfalse(rs.getString("isfalse"));
				timustu.setShijian(rs.getString("shijian"));
				
					
				timustuList.add(timustu);
	                } else {
	                    break; //减少空循环的时间
	                }
				}
			rs.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		mydb.closed();
		
		req.setAttribute("timustuList", timustuList);
		req.getRequestDispatcher("qiantai/timustu/timustu.jsp").forward(req, res);
	}



















	public void dispatch(String targetURI,HttpServletRequest request,HttpServletResponse response) 
	{
		RequestDispatcher dispatch = getServletContext().getRequestDispatcher(targetURI);
		try 
		{
		    dispatch.forward(request, response);
		    return;
		} 
		catch (ServletException e) 
		{
                    e.printStackTrace();
		} 
		catch (IOException e) 
		{
			
		    e.printStackTrace();
		}
	}
	public void init(ServletConfig config) throws ServletException 
	{
		super.init(config);
	}
	
	public void destroy() 
	{
		
	}
}

5. Front-end code example

 

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ page isELIgnored="false" %> 
<%
String path = request.getContextPath();
%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<meta http-equiv="pragma" content="no-cache" />
		<meta http-equiv="cache-control" content="no-cache" />
		<meta http-equiv="expires" content="0" />
		<meta http-equiv="keywords" content="keyword1,keyword2,keyword3" />
		<meta http-equiv="description" content="This is my page" />

		<link rel="stylesheet" type="text/css" href="<%=path %>/css/base.css" />
		
        <script language="javascript">
           function chengjiDel(id)
           {
               if(confirm('您确定删除吗？'))
               {
                   window.location.href="<%=path %>/chengji?type=chengjiDel&id="+id;
               }
           }
           
           function p()
           {
              window.print();
           }
       </script>
	</head>

	<body leftmargin="2" topmargin="2" >
			<table width="98%" border="0" cellpadding="2" cellspacing="1" bgcolor="#D1DDAA" align="center" style="margin-top:8px">
				<tr bgcolor="#E7E7E7">
					<td height="14" colspan="9" background="<%=path %>/images/wbg.gif">&nbsp;考试成绩管理&nbsp;</td>
				</tr>
				<tr align="center" bgcolor="#FAFAF1" height="22">
					<td>用户名</td>
					<td>课程名称</td>
					<td>成绩</td>
					<td>测试/考试</td>
					<td >日期</td>
					<td>操作</td>
		        </tr>	
				<c:forEach items="${requestScope.chengjiList}" var="chengji">
				<tr align='center' bgcolor="#FFFFFF" onMouseMove="javascript:this.bgColor='red';" onMouseOut="javascript:this.bgColor='#FFFFFF';" height="22">
					<td bgcolor="#FFFFFF" align="center">
						${chengji.stu_name}
					</td>
					<td bgcolor="#FFFFFF" align="center">
						${chengji.kecheng_name}
					</td>
					<td bgcolor="#FFFFFF" align="center">
						${chengji.chengji}
					</td>
					<td bgcolor="#FFFFFF" align="center">
					    ${chengji.istest}
					</td>
					<td bgcolor="#FFFFFF" align="center">
					    ${chengji.shijian}
					</td>
					<td bgcolor="#FFFFFF" align="center">
						<a href="#" onclick="chengjiDel(${chengji.id})" class="pn-loperator">删除</a>
					</td>
				</tr>
				</c:forEach>
			</table>
			
	</body>
</html>