MVC模式的学生信息增删改查

准备：建一个名为 userdb的数据库。建一个student表,有stuid,stuname,gender三个字段。其中stuid为主键。j加入相应的驱动包，相应的JSTL标签

先看目录结构

代码：

DDUtil.java

package util;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

/**

 * @author sawyer 2014下午1:20:16

 *

 */

public class DBUtil {

	private Connection conn = null;

	private PreparedStatement stmt = null;

	private ResultSet rs = null;

	private static String driver = "com.mysql.jdbc.Driver";

	private String url = "jdbc:mysql://localhost:3306/userdb";

	private String user = "root";

	private String password = "orcl";

	/**

	 * Get the driver

	 */

	static {

	}

	/**

	 * Connect the database

	 */

	public Connection getCon() {

		try {

			Class.forName(driver);

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

		try {

			conn = (Connection) DriverManager

					.getConnection(url, user, password);

		} catch (SQLException e) {

			e.printStackTrace();

		}

		return conn;

	}

	/**

	 * @param sql

	 * @param obj

	 *            Update

	 *//*

	public int update(String sql, Object... obj) {

		int count = 0;

		conn = getCon();

		try {

			stmt = conn.prepareStatement(sql);

			if (obj != null) {

				for (int i = 0; i < obj.length; i++) {

					stmt.setObject(i + 1, obj[i]);

				}

			}

			count = stmt.executeUpdate();

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			close();

		}

		return count;

	}

	*//**

	 * @param sql

	 * @param obj

	 *            Query

	 *//*

	public ResultSet Query(String sql, Object... obj) {

		conn = getCon();

		try {

			stmt = conn.prepareStatement(sql);

			while (obj != null) {

				for (int i = 0; i < obj.length; i++) {

					stmt.setObject(i + 1, obj[i]);

				}

			}

			rs = stmt.executeQuery();

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			close();

		}

		return rs;

	}*/

	/**

	 * CLose the resource

	 */

	public void close() {

		try {

			if (rs != null) {

				rs.close();

			}

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			try {

				if (stmt != null) {

					stmt.close();

				}

			} catch (SQLException e) {

				e.printStackTrace();

			} finally {

				if (conn != null) {

					try {

						conn.close();

					} catch (SQLException e) {

						e.printStackTrace();

					}

				}

			}

		}

	}

}

Student.java

package entity;

public class Student {

	private int stuid;

	private String stuname;

	private String gender;

	public int getStuid() {

		return stuid;

	}

	public void setStuid(int stuid) {

		this.stuid = stuid;

	}

	public String getStuname() {

		return stuname;

	}

	public void setStuname(String stuname) {

		this.stuname = stuname;

	}

	public String getGender() {

		return gender;

	}

	public void setGender(String gender) {

		this.gender = gender;

	}

	public Student()

	{

	}

	public Student(int stuid, String stuname, String gender) {

		super();

		stuid = this.stuid;

		stuname = this.stuname;

		gender = this.gender;

	}

}

Model.java

package model;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import java.util.ArrayList;

import java.util.List;

import entity.Student;

import util.DBUtil;

public class Model {

	private Statement sta;

	private ResultSet rs;

	PreparedStatement ps;

	DBUtil u=new DBUtil();

	public  int Insert(int stuid,String stuname,String gender) throws SQLException{

		Connection conn=u.getCon();

		String sql="insert student values(?,?,?)";

		ps=conn.prepareStatement(sql);

		ps.setInt(1,stuid);

		ps.setString(2,stuname);

		ps.setString(3,gender);

		int a=ps.executeUpdate();

		return a;

	}

	public  int delete(int stuid) throws SQLException{

		Connection conn=u.getCon();

		String sql="delete from student where stuid=?";

		ps=conn.prepareStatement(sql);

		ps.setInt(1,stuid);

		int a=ps.executeUpdate();

		return a;

	}

	public  int update(int stuid,String stuname,String gender) throws SQLException{

		Connection conn=u.getCon();

		String sql="update student set stuname=?,gender=? where stuid=?";

		ps=conn.prepareStatement(sql);

		ps.setInt(3,stuid);

		ps.setString(1,stuname);

		ps.setString(2,gender);

		int a=ps.executeUpdate();

		return a;

	}

	public List<Student> queryAll() throws SQLException{

		List<Student> students=new ArrayList<Student>();

		Connection conn=u.getCon();

		String  sql="select * from student";

		sta=conn.createStatement();

		rs=sta.executeQuery(sql);

		while(rs.next()){

			Student student=new Student();

			student.setStuid(rs.getInt("stuid"));

			student.setStuname(rs.getString("stuname"));

			student.setGender(rs.getString("gender"));

			students.add(student);

		}

		return students;

	}

	public Student queryById(int stuid) throws SQLException{

		Student student=new Student();

		Connection conn=u.getCon();

		String sql="select * from student where stuid=?";

		ps=conn.prepareStatement(sql);

		ps.setInt(1,stuid);

		rs=ps.executeQuery();

		if(rs.next()){

			student.setStuid(rs.getInt("stuid"));

			student.setStuname(rs.getString("stuname"));

			student.setGender(rs.getString("gender"));

		}

		return student;

	}

}

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="3.0"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

  <display-name></display-name>

  <filter>

  <filter-name>EncodingFilter</filter-name>

  <filter-class>servlet.EncodingFilter</filter-class>

  <init-param>

  <param-name>encoding</param-name>

  <param-value>UTF-8</param-value>

  </init-param>

  </filter>

  <filter-mapping>

  <filter-name>EncodingFilter</filter-name>

  <url-pattern>/*</url-pattern>

  </filter-mapping>

  <servlet>

  <servlet-name>QueryAll</servlet-name>

  <servlet-class>servlet.QueryAll</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>QueryAll</servlet-name>

  <url-pattern>/QueryAll.do</url-pattern>

  </servlet-mapping>

   <servlet>

  <servlet-name>Insert</servlet-name>

  <servlet-class>servlet.Insert</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>Insert</servlet-name>

  <url-pattern>/Insert.do</url-pattern>

  </servlet-mapping>

  <servlet>

  <servlet-name>SelectUpdate</servlet-name>

  <servlet-class>servlet.SelectUpdate</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>SelectUpdate</servlet-name>

  <url-pattern>/SelectUpdate.do</url-pattern>

  </servlet-mapping>

   <servlet>

  <servlet-name>Update</servlet-name>

  <servlet-class>servlet.Update</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>Update</servlet-name>

  <url-pattern>/Update.do</url-pattern>

  </servlet-mapping>

   <servlet>

  <servlet-name>Delete</servlet-name>

  <servlet-class>servlet.Delete</servlet-class>

  </servlet>

  <servlet-mapping>

  <servlet-name>Delete</servlet-name>

  <url-pattern>/Delete.do</url-pattern>

  </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

</web-app>

QueryAll.java

package servlet;

import java.io.IOException;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import entity.Student;

import model.Model;

@SuppressWarnings("serial")

public class QueryAll extends HttpServlet{

	public QueryAll(){

		super();

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{

		Model model=new Model();

		try{

	    List<Student> list=model.queryAll();

	    request.getSession().setAttribute("list", list);

		}catch(Exception e){

			e.printStackTrace();

		}

	    response.sendRedirect("index.jsp");

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{

		this.doGet(request, response);

	}

}

Insert.java

package servlet;

import java.io.IOException;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import model.Model;

@SuppressWarnings("serial")

public class Insert extends HttpServlet{

	public Insert(){

		super();

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{

		Model model = new Model();

		int stuid = Integer.parseInt(request.getParameter("stuid"));

		String stuname = request.getParameter("stuname");

		String gender = request.getParameter("gender");

		try {

			model.Insert(stuid, stuname, gender);

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		response.sendRedirect("QueryAll.do");

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{

		this.doGet(request, response);

	}

}

Delete.java

package servlet;

import java.io.IOException;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import model.Model;

@SuppressWarnings("serial")

public class Delete extends HttpServlet{

	public Delete(){

		super();

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{

		Model model=new Model();

		int stuid=Integer.parseInt(request.getParameter("stuid"));

		/*String stuname=request.getParameter("stuname");

		String gender=request.getParameter("gender");*/

		try {

			model.delete(stuid);

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		response.sendRedirect("QueryAll.do");

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{

		this.doGet(request, response);

	}

}

SelectUpdate.java

package servlet;

import java.io.IOException;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import entity.Student;

import model.Model;

@SuppressWarnings("serial")

public class SelectUpdate extends HttpServlet{

	public SelectUpdate(){

		super();

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{

		int stuid=Integer.parseInt(request.getParameter("stuid"));

		Model model=new Model();

		try {

			Student student=model.queryById(stuid);

			request.setAttribute("student", student);

			int id=Integer.parseInt(request.getParameter("id"));

			if(id==1){

			request.getRequestDispatcher("update.jsp").forward(request, response);

			}else if(id==2){

				request.getRequestDispatcher("delete.jsp").forward(request, response);

			}

			} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (ServletException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{

		this.doGet(request, response);

	}

}

Update.java

package servlet;

import java.io.IOException;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import model.Model;

@SuppressWarnings("serial")

public class Update extends HttpServlet{

	public Update(){

		super();

	}

	public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{

		Model model=new Model();

		int stuid=Integer.parseInt(request.getParameter("stuid"));

		String stuname=request.getParameter("stuname");

		String gender=request.getParameter("gender");

		try {

			model.update(stuid, stuname, gender);

		} catch (SQLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		response.sendRedirect("QueryAll.do");

	}

	public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{

		this.doGet(request, response);

	}

}

EncodingFilter.java

package servlet;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

public class EncodingFilter implements Filter {

	private String encoding = null;

	public void init(FilterConfig config) throws ServletException {

		this.encoding = config.getInitParameter("encoding");

	}

	public void doFilter(ServletRequest request, ServletResponse response,

			FilterChain chain) throws IOException, ServletException {

		request.setCharacterEncoding(this.encoding);

		response.setCharacterEncoding(this.encoding);

		chain.doFilter(request, response);

	}

	public void destroy() {

		this.encoding = null;

	}

}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page language="java" import="model.*,entity.*,servlet.*"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"  %>

<%@ taglib uri="http://jsptags.com/tags/navigation/pager" prefix="pg" %>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>

    <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="styles.css">

    -->

  </head>

  <body>

  <h1>学生信息列表</h1>

  <a href="insert.jsp">新增</a><br><hr>

  <pg:pager maxPageItems="10" url="index.jsp">

    <table border="1">

    <tr><td>学号</td><td>姓名</td><td>性别</td><td>修改</td><td>删除</td></tr>

    <c:forEach items="${sessionScope.list}" var="student">

    <pg:item>

    <tr>

    <td>${student.stuid}</td>

    <td>${student.stuname}</td>

    <td>${student.gender}</td>

    <td><a href="SelectUpdate.do?id=1&stuid=${student.stuid}">修改</a></td>

    <td><a href="SelectUpdate.do?id=2&stuid=${student.stuid}">删除</a></td>

    </tr>

    </pg:item>

    </c:forEach>

    <tr>

    <td>

    <pg:index>

    <pg:first><a href="${pageUrl}">第一页</a></pg:first>

    <pg:prev><a href="${pageUrl}">上一页</a></pg:prev>

    <pg:pages><a href="${pageUrl}">${pageNumber}</a></pg:pages>

    <pg:next><a href="${pageUrl}">下一页</a></pg:next>

    <pg:last><a href="${pageUrl}">最后一页</a></pg:last>

    </pg:index>

    </td>

    </tr>

   </table>

   </pg:pager>

  </body>

</html>

delete.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'delete.jsp' starting page</title>

	<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="styles.css">

	-->

  </head>

  <body>

    <h1>删除数据</h1>

	<form action="Delete.do" method="post">

		<table>

			<tr>

				<td>请输入数据：</td>

				<td>学号：<input type="text" name="stuid" id="stuid" value="${student.stuid}">

				</td>

				<td>姓名：<input type="text" name="stuname" id="stuname" value="${student.stuname}">

				</td>

				<td>性别：<input type="text" name="gender" id="gender" value="${student.gender}">

				</td>

			</tr>

			<tr><td><input type="submit" value="删除"></td>

		</table>

	</form>

  </body>

</html>

insert.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'insert.jsp' starting page</title>

	<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="styles.css">

	-->

  </head>

  <body>

    <h1>增加数据</h1>

	<form action="Insert.do" method="post">

		<table>

			<tr>

				<td>请插入数据：</td>

				<td>学号：<input type="text" name="stuid" id="stuid">

				</td>

				<td>姓名：<input type="text" name="stuname" id="stuname">

				</td>

				<td>性别：<input type="text" name="gender" id="gender">

				</td>

				<td><input type="submit" value="插入" id="submit">

				</td>

			</tr>

		</table>

	</form>

  </body>

</html>

update.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'update.jsp' starting page</title>

	<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="styles.css">

	-->

  </head>

  <body>

    <h1>更新数据</h1>

	<form action="Update.do" method="post">

		<table>

			<tr>

				<td>请输入数据：</td>

				<td>学号：<input type="text" name="stuid" id="stuid" value="${student.stuid}">

				</td>

				<td>姓名：<input type="text" name="stuname" id="stuname" value="${student.stuname}">

				</td>

				<td>性别：<input type="text" name="gender" id="gender" value="${student.gender}">

				</td>

			</tr>

			<tr><td><input type="submit" value="修改"></td>

			<td><input type="reset" value="重置"></td></tr>

		</table>

	</form>

  </body>

</html>

代码完美运行！！！

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