MVC学生管理系统-阶段I（显示学生列表）

项目源码 ：https://download.csdn.net/download/weixin_44718300/11091042

目录

MVC设计模式

前期准备：

NO01：新建一个index.jsp页面

NO02：在servlet包下创建一个Servlet

NO03：在util包下创建JDBCUtil

NO04：在been包下创建一个Student类

NO05：在dao包下创建一个StudentDao的接口

NO06：在dao.impl包下实现接口

NO07：在service包下创建一个接口

NO08：在service.impl包下实现接口

NO09：编辑StudentListServlet

NO10：新建list.jsp

---

MVC设计模式

JSP的开发模式

三层架构&MVC练习

前期准备：

• 1.jar包：

• 2.c3p0-config.xml配置：

放在src目录下

• 3.建包

• 4.准备数据库

1. CREATE DATABASE stus;
2. USE stus;
3. CREATE TABLE stu ( sid INT PRIMARY KEY AUTO_INCREMENT, sname VARCHAR (20), gender VARCHAR (5), phone VARCHAR (20), birthday DATE, hobby VARCHAR(50), info VARCHAR(200) );

NO01：新建一个index.jsp页面

<h3><a href="StudentListServlet">显示所有学生列表</a><h3>

NO02：在servlet包下创建一个Servlet

名字为StudentListServlet，接收请求， 去调用 Service , 由service去调用dao

负查询所有所有学生信息，呈现到list.jsp页面上

我们创建完先不要管他，因为我们先获取数据库中的信息

NO03：在util包下创建JDBCUtil

package com.rick.util;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JDBCUtil {

	static ComboPooledDataSource dataSource = null;
	static{
		dataSource = new ComboPooledDataSource();
	}

	public static DataSource getDataSouce() {
		return dataSource;
	}
	/**
	 * 获取连接对象
	 * @return
	 * @throws SQLException
	 */
	public static Connection getConn() throws SQLException{
		return dataSource.getConnection();
	}

	/**
	 * 释放资源
	 * @param conn
	 * @param st
	 * @param rs
	 */
	public static void release(Connection conn , Statement st , ResultSet rs){
		closeRs(rs);
		closeSt(st);
		closeConn(conn);
	}
	public static void release(Connection conn , Statement st){
		closeSt(st);
		closeConn(conn);
	}

	private static void closeRs(ResultSet rs){
		try {
			if(rs != null){
				rs.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			rs = null;
		}
	}

	private static void closeSt(Statement st){
		try {
			if(st != null){
				st.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			st = null;
		}
	}

	private static void closeConn(Connection conn){
		try {
			if(conn != null){
				conn.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}finally{
			conn = null;
		}
	}
}

NO04：在been包下创建一个Student类

package com.rick.been;

import java.util.Date;

public class Student {
	private int sid;
	private String sname;
	private String gender;
	private String phone;
	private Date birthday;
	private String hobby;
	private String info;
	public int getSid() {
		return sid;
	}
	public void setSid(int sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getGender() {
		return gender;
	}
	public void setGender(String gender) {
		this.gender = gender;
	}
	public String getPhone() {
		return phone;
	}
	public void setPhone(String phone) {
		this.phone = phone;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public String getHobby() {
		return hobby;
	}
	public void setHobby(String hobby) {
		this.hobby = hobby;
	}
	public String getInfo() {
		return info;
	}
	public void setInfo(String info) {
		this.info = info;
	}

}

NO05：在dao包下创建一个StudentDao的接口

package com.rick.dao;

import java.sql.SQLException;
import java.util.List;

import com.rick.been.Student;

/*
 * 这是针对学生表的数据访问
 */
public interface StudentDao{

	//查询多有学生
	List<Student> findAll() throws SQLException;
}

NO06：在dao.impl包下实现接口

package com.rick.dao.impl;

import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.rick.been.Student;
import com.rick.dao.StudentDao;
import com.rick.util.JDBCUtil;

public class StudentDaoImpl implements StudentDao{

	/*
	 * 抛异常的时候父类没有抛子类不能直接抛，所以去父类先抛一下
	 */
	@Override
	public List<Student> findAll() throws SQLException {
		QueryRunner runner = new QueryRunner(JDBCUtil.getDataSouce());
		String sql = "select * from stu";
		List<Student> list = runner.query(sql, new BeanListHandler<Student>(Student.class));
		return list;
	}
}

NO07：在service包下创建一个接口

package com.rick.sercive;

import java.sql.SQLException;
import java.util.List;

import com.rick.been.Student;

/*
 * 这是学生的业务处理规范
 */
public interface StudentService {

	// 查询多有学生
	List<Student> findAll() throws SQLException;

}

NO08：在service.impl包下实现接口

package com.rick.sercive.impl;

import java.sql.SQLException;
import java.util.List;

import com.rick.been.Student;
import com.rick.dao.StudentDao;
import com.rick.dao.impl.StudentDaoImpl;
import com.rick.sercive.StudentService;

/*
 * 这是学生的业务实现
 */
public class StudentServiceImpl implements StudentService{

	public List<Student> findAll() throws SQLException {
		StudentDao dao = new StudentDaoImpl();
		return dao.findAll();
	}

}

NO09：编辑StudentListServlet

package com.rick.servlet;

import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

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

import com.rick.been.Student;
import com.rick.sercive.StudentService;
import com.rick.sercive.impl.StudentServiceImpl;
/*
 * 负查询所有所有学生信息，呈现到list.jsp页面上
 */
public class StudentListServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		    StudentService service = null;
			List<Student> list = null;
			try {
				//1查出所有学生
				service = new StudentServiceImpl();
				list = service.findAll();
                //2.把数据传到作用于中
				request.setAttribute("list", list);
				//3跳转
				request.getRequestDispatcher("list.jsp").forward(request, response);

			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
	}

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

}

NO10：新建list.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>学生列表界面</title>
</head>
<body>
	<table>
		<tr>
			<td>编号</td>
			<td>姓名</td>
			<td>性别</td>
			<td>电话</td>
			<td>生日</td>
			<td>爱好</td>
			<td>简介</td>
			<td>操作</td>
		</tr>
		<c:forEach items = "${list}" var = "stu">
			<tr>
				<td>${stu.sid}</td>
				<td>${stu.sname}</td>
				<td>${stu.gender}</td>
				<td>${stu.phone}</td>
				<td>${stu.birthday}</td>
				<td>${stu.hobby}</td>
				<td>${stu.info}</td>
				<td><a href="#">更新</a> <a href="#">删除</a></td>
			</tr>
		</c:forEach>
	</table>

</body>
</html>