（一）MVC项目
一.整体架构：
注：取自其他文章，最后的NewFile.html纯用于测试错误，完全不用。
二.具体代码：
1.User.java
package common;
public class User {
private Integer id;
private String name;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
2.UserDao.java
package dao; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List; import common.User;
import helper.DbHelper; public class UserDao {
/**
* 查询所有用户信息
* @return
*/
public List<User> getAllUser(){
List<User> list = new ArrayList<User>();
Connection conn = DbHelper.getConnection();//连接数据库
String sql = "select * from user";
try {
PreparedStatement pst = conn.prepareStatement(sql);
ResultSet rst = pst.executeQuery();
while (rst.next()) {
User user = new User();
user.setId(rst.getInt("id"));
user.setName(rst.getString("name"));
user.setAge(rst.getInt("age"));
list.add(user);
}
rst.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
return list;
} /**
* 添加用户
* @param user
* @return
*/
public boolean addUser(User user){
String sql = "INSERT INTO `user`(`name`,`age`) VALUES (?,?)";
Connection conn = DbHelper.getConnection();
try {
PreparedStatement pst = conn.prepareStatement(sql);
pst.setString(1, user.getName());
pst.setInt(2, user.getAge());
int count = pst.executeUpdate();
pst.close();
return count>0?true:false;
} catch (SQLException e) {
e.printStackTrace();
}
return false;
} /**
* 修改用户信息
* @param user
* @return
*/
public boolean updateUser(User user){
String sql = "UPDATE `user` SET `name`=?,`age`=? WHERE `id` = ?";
Connection conn = DbHelper.getConnection();
try {
PreparedStatement pst = conn.prepareStatement(sql);
pst.setString(1, user.getName());
pst.setInt(2, user.getAge());
pst.setInt(3, user.getId());
int count = pst.executeUpdate();
pst.close();
return count>0?true:false;
} catch (SQLException e) {
e.printStackTrace();
}
return false;
} /**
* 删除用户
* @param id
* @return
*/
public boolean deleteUser(int id){
String sql = "delete from user where id = ?";
Connection conn = DbHelper.getConnection();
try {
PreparedStatement pst = conn.prepareStatement(sql);
pst.setInt(1, id);
int count = pst.executeUpdate();
pst.close();
return count>0?true:false;
} catch (SQLException e) {
e.printStackTrace();
}
return false;
} /**
* 根据ID进行查询用户
* @param id
* @return
*/
public User selectUserById(int id){
Connection conn = DbHelper.getConnection();
String sql = "select * from user where id = "+id;
User user = null;
try {
PreparedStatement pst = conn.prepareStatement(sql);
ResultSet rst = pst.executeQuery();
while (rst.next()) {
user = new User();
user.setId(rst.getInt("id"));
user.setName(rst.getString("name"));
user.setAge(rst.getInt("age"));
}
rst.close();
pst.close();
} catch (SQLException e) {
e.printStackTrace();
}
return user;
}
}
3.DbHelper
package helper; import java.sql.Connection;
import java.sql.DriverManager; public class DbHelper {
private static String url = "jdbc:mysql://localhost:3306/my-db"; //数据库地址
private static String userName = "root"; //数据库用户名
private static String passWord = "Pa33w0rd"; //数据库密码
private static Connection conn = null; private DbHelper(){ } public static Connection getConnection(){
if(null == conn){
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, userName, passWord);
} catch (Exception e) {
e.printStackTrace();
}
}
return conn;
} public static void main(String[] args) { //测试数据库是否连通
System.out.println(getConnection());
}
}
4.Servlet
package servlet; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import common.User;
import dao.UserDao; public class AddServlet extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws
ServletException, IOException { this.doPost(req, resp); } protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String name = req.getParameter("name");
Integer age = Integer.valueOf(req.getParameter("age"));
User user = new User();//创建user对象
user.setName(name);
user.setAge(age);
UserDao dao = new UserDao();
dao.addUser(user);//添加到数据库中
req.getRequestDispatcher("list").forward(req, resp);
} // @Override
// protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// String name = req.getParameter("name");
// Integer age = Integer.valueOf(req.getParameter("age"));
// System.out.println("name:"+name+" 111111111 age:"+age);
// User user = new User();//创建user对象
// user.setName(name);
// user.setAge(age);
// UserDao dao = new UserDao();
// dao.addUser(user);//添加到数据库中
// req.getRequestDispatcher("list").forward(req, resp);
// }
}
package servlet; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import dao.UserDao; public class DeleteServlet extends HttpServlet{
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doPost(req, resp);
} protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String idStr = req.getParameter("id"); // 删除数据的ID，根据ID删除
if (idStr != null && !idStr.equals("")) {
int id = Integer.valueOf(idStr);
UserDao dao = new UserDao();
dao.deleteUser(id);
}
req.getRequestDispatcher("list").forward(req, resp);
}
}
package servlet; import java.io.IOException;
import java.util.List; 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 common.User;
import dao.UserDao; @WebServlet("/list")
public class ListServlet extends HttpServlet { protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
UserDao dao = new UserDao();
List<User> list = dao.getAllUser();
System.out.println("dao:"+dao+" 111111111 list:"+list);
req.setAttribute("userInfoList", list);
req.getRequestDispatcher("list.jsp").forward(req, resp); } protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req, resp);
} }
package servlet; import java.io.IOException; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import common.User;
import dao.UserDao; public class UpdateServlet extends HttpServlet {
/**
* 查询到选中ID的值所对应的数据
*/
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String idStr = req.getParameter("id");
if (idStr != null && !idStr.equals("")) {
int id = Integer.valueOf(idStr);
UserDao dao = new UserDao();
User user = dao.selectUserById(id);
req.setAttribute("user", user);
}
req.getRequestDispatcher("update.jsp").forward(req, resp);
} /**
* 根据此ID对数据的值进行修改
*/
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String idStr = req.getParameter("id");
if (idStr != null && !idStr.equals("")) {
int id = Integer.valueOf(idStr);
String name = req.getParameter("name");
Integer age = Integer.valueOf(req.getParameter("age"));
User user = new User();
user.setId(id);
user.setName(name);
user.setAge(age);
UserDao dao = new UserDao();
dao.updateUser(user);
}
req.getRequestDispatcher("list").forward(req, resp);
}
}
5.web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>MyServlet</display-name>
<!-- <servlet>
servlet的注册名称，自定义。每个servlet的name不一样
<servlet-name>listServ</servlet-name>
servlet的完整类名： 包名+类名；如果ctrl+鼠标左击能 点开，说明成功
<servlet-class>servlet.ListServlet</servlet-class>
</servlet> -->
<!-- servlet的映射配置 -->
<!-- <servlet-mapping>
servlet的注册名称，一定要和上面的内部名称保持一致！！
<servlet-name>listServ</servlet-name>
servlet的对外访问路径（访问servlet的名称）
<url-pattern>/list</url-pattern>
</servlet-mapping>
ps:同一个servlet可以配置多个servlet-mapping，举个栗子
<servlet-mapping>
还是上面的那个servlet
<servlet-name>listServ</servlet-name>
除了/ListServlet,又配置了一个list2,通过这两个路径都可访问listServ这个servlet
<url-pattern>/list2</url-pattern>
</servlet-mapping> --> <servlet>
<servlet-name>addServ</servlet-name>
<servlet-class>servlet.AddServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>addServ</servlet-name>
<url-pattern>/add</url-pattern>
</servlet-mapping> <servlet>
<servlet-name>updateServ</servlet-name>
<servlet-class>servlet.UpdateServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>updateServ</servlet-name>
<url-pattern>/update</url-pattern>
</servlet-mapping> <servlet>
<servlet-name>delServ</servlet-name>
<servlet-class>servlet.DeleteServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>delServ</servlet-name>
<url-pattern>/delete</url-pattern>
</servlet-mapping>
</web-app>
6.前端代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>新增用户</title>
<script type="text/javascript">
function check(form) {
with (form) {
if (name.value == "") {
alert("用户名不能为空");
return false;
}
}
}
</script>
</head>
<body>
<form action="add" method="post" onsubmit="check(this)">
<table align="center" width="450">
<tr>
<td align="center" colspan="2">
<h2>添加用户信息</h2>
<hr>
</td>
</tr>
<tr>
<td align="right">用户名：</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td align="right">年龄：</td>
<td><input type="text" name="age"></td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="submit" value="添 加">
</td>
</tr>
</table>
</form>
</body>
</html>
<%@ 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">
<%@page import="java.util.List"%>
<%@page import="common.User"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>所有用户</title>
<style type="text/css">
td {
font-size: 12px;
}
h2 {
margin: 0px
}
</style>
<script type="text/javascript"> </script>
</head>
<body>
<h2 align="center">
<a href="add.jsp">添加新用户</a>
</h2>
<br>
<table align="center" width="450" border="1" height="180"
bordercolor="white" bgcolor="black" cellpadding="1" cellspacing="1">
<tr bgcolor="white">
<td align="center" colspan="7">
<h2>所有用户信息</h2>
</td>
</tr>
<tr align="center" bgcolor="#e1ffc1">
<td><b>ID</b></td>
<td><b>姓名</b></td>
<td><b>年龄</b></td>
<td colspan="2"><b>操作</b></td>
</tr>
<%
// 获取用户信息集合
List<User> list = (List<User>)(request.getAttribute("userInfoList"));
// 判断是否有数据
if (list == null || list.size() < 1) {
%>
<tr bgcolor="white"><td colspan="5" ><h4 align="center">没有数据</h4></td></tr>
<%
} else {
// 遍历用户集合中的数据
for (User user : list) {
%>
<tr align="center" bgcolor="white">
<td><%=user.getId()%></td>
<td><%=user.getName()%></td>
<td><%=user.getAge()%></td>
<td >
<a href="update?id=<%=user.getId()%>">修改</a> </td>
<td>
<a href="delete?id=<%=user.getId()%>">删除</a>
</td>
</tr>
<%
}
}
%>
</table>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@page import="common.User"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>修改用户信息页面</title>
</head>
<body>
<div>
<table>
<thead><tr><td><h1>修改用户信息</h1></td></tr></thead>
<tbody>
<form action="update" method="post">
<tr>
<td>ID：</td>
<td><input type="text" name="id" value="${user.id}"
readonly="readonly" /></td>
</tr>
<tr>
<td>name：</td>
<td><input type="text" name="name" value="${user.name}" /></td>
</tr>
<tr>
<td>age：</td>
<td><input type="text" name="age" value="${user.age}" /></td>
</tr>
<tr>
<td><input class="btn" type="submit" value="提交" /> <input
class="btn" type="reset" value="重置" /></td>
</tr>
</tbody>
</form>
</table>
</div>
</body>
</html>
三.jar包：mysql-connector-java-5.1.43-bin.jar（用于数据库连接）
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