用JAVA+jdbc+Mysql简单实现登陆注册页面相互跳转
2020-06-30 11:27
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前言
这是一份作业
准备材料
IDEA
Mysql 5.1
jstl-1.2.jar
mysql-connector-java-5.1.47-bin.jar
注：敲代码过程中出现的几乎所有红线均可用alt+回车，选择第一项解决
导入Jar包
新建Directory文件，命名为lib，在lib下拖入两个Jar包
右键点击jstl-1.2.jar，选择 add as library，同理mysql-connector-java-5.1.47-bin.jar
File→Project Structure→Artifacts
选择Fix修复添加相关jar包
Mysql
在用JAVA+jdbc+Mysql简单实现登陆注册中建立的user数据库中添加age字段（右键，设计表）
JAVA
在JAVA0629下新建dao、modle、service、util文件
再分别New UserDao、User、UserService、DBUtil class
User实体类
定义字段
private int id; private String name; private String password; private String age;
快捷键Alt+Insert 或 在当前页面右键选择Generat
效果
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", password='" + password + '\'' +
", age='" + age + '\'' +
'}';
}
DBUtil实体类
package com.JAVA0629.util;
import java.sql.*;
public class DBUtil {
public static Connection getConnection() throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("连接数据库");
//创建连接
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/testtt?useSSL=false","root","123456");
return connection;
}
public static void closeAll(ResultSet rs,Statement stmt,Connection conn) throws SQLException {
if(rs != null){
rs.close();
}
if(stmt != null){
stmt.close();
}
if(conn != null){
conn.close();
}
}
}
UserDao实体类
package com.JAVA0629.dao;
import com.JAVA0629.modle.User;
import com.JAVA0629.util.DBUtil;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class UserDao {
public int add(User user){
Connection connection = null;
PreparedStatement pstmt = null;
int count = 0;
try{
connection = DBUtil.getConnection();
//获得执行sql的Statement对象
pstmt = (PreparedStatement) connection.prepareStatement("insert into user (name,password,age) values (?,?,?)");
pstmt.setString(1,user.getName());
pstmt.setString(2,user.getPassword());
pstmt.setString(3,user.getAge());
//执行sql，获得结果
count = pstmt.executeUpdate();
System.out.println("insert操作：" + count);
return count;
}catch (Exception e){
e.printStackTrace();
}finally {
try {
DBUtil.closeAll(null,pstmt,connection);
} catch (SQLException e) {
e.printStackTrace();
}
}
return count;
}
public int del(User user) {
Connection connection = null;
PreparedStatement pstmt = null;
int count = 0;
try{
connection = DBUtil.getConnection();
System.out.println("连接成功！");
pstmt = (PreparedStatement) connection.prepareStatement("delete into user (name,password,age) values (?,?,?)");
pstmt.setString(1,user.getName());
pstmt.setString(2,user.getPassword());
pstmt.setString(3,user.getAge());
count = pstmt.executeUpdate();
System.out.println("delete操作：" + count);
return count;
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
DBUtil.closeAll(null,pstmt,connection);
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
return count;
}
UserService实体类
package com.JAVA0629.service;
import com.JAVA0629.dao.UserDao;
import com.JAVA0629.modle.User;
import java.sql.SQLException;
public class UserService {
UserDao userDao = new UserDao();
public int add(User user) {
System.out.println("service中add方法被调用");
return userDao.add(user);
}
public int del(User user) {
System.out.println("service中del方法被调用");
return userDao.del(user);
}
}
add.jsp
右键web新建JSP/JSPX
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2020/6/30 Time: 10:21 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>注册</title> </head> <body> <form action="/add?method=save" method="post"> name:<input name="name" type="text"> password:<input name="password" type="password"> age:<input name="age" type="text"> <input type="submit" value="注册"> </form> </body> </html>
AddServlet实体类
在servlet下新建AddServlet实体类
package com.JAVA0629.servlet;
import com.JAVA0629.modle.User;
import com.JAVA0629.service.UserService;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
public class AddServlet extends HttpServlet {
UserService userService = new UserService();
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{
System.out.println("执行了doPost");
String method = req.getParameter("method");
if(method.equals("save")){
insert(req,resp);
}
}
public void insert(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{
User user = new User();
String name = req.getParameter("name");
String password = req.getParameter("password");
String age = req.getParameter("age");
user.setName(name);
user.setPassword(password);
user.setAge(age);
System.out.println(user);
int count = userService.add(user);
if(count>0){
resp.sendRedirect("/index.jsp");
}else {
resp.getWriter().write("<h2>failed</h2>");
}
}
public void delete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException{
User user = new User();
String name = req.getParameter("name");
String password = req.getParameter("password");
String age = req.getParameter("age");
user.setName(name);
user.setPassword(password);
user.setAge(age);
System.out.println(user);
int count = userService.del(user);
if(count>0){
resp.sendRedirect("/index.jsp");
}else {
resp.getWriter().write("<h2>failed<h2>");
}
}
}
修改index.jsp
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2020/6/29 Time: 10:19 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>登陆</title> </head> <body> <h1>登陆页面</h1> <form action="/login" method="post"> name:<input name="name" type="text"> password:<input name="password" type="password"> <input type="submit" value="login"> </form> <a href="add.jsp">跳转到注册页面</a> </body> </html>
delete.jsp
右键web新建JSP/JSPX
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2020/6/30 Time: 14:29 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>注销</title> </head> <body> <form action="/del?method=delete" method="post"> name:<input name="name" type="text"> password:<input name="password" type="password"> age:<input name="name" type="text"> <input type="submit" value="注销"> </form> </body> </html>
运行结果
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