一、数据库
二、注册index页面
<%-- Created by IntelliJ IDEA. User: 113 Date: 2020/10/2 Time: 10:34 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>201819101036李佳</title> </head> <body> <form method="post" action="register.jsp"> 用户名:<input type="text" name="username"><br> 密码: <input type="text" name="password"><br> 性别: <input type="text" name="gender"><br> 年龄: <input type="text" name="age"><br> <button type="submit">注册</button> </form> </body> </html>
三、User Bean.java
package com.media.bean; public class UserBean { private String username; private String password; private int gender; private int age; private int status; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public int getGender() { return gender; } public void setGender(int gender) { this.gender = gender; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getStatus() { return status; } public void setStatus(int status) { this.status = status; } }四、删除-------register.jsp
<%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.media.bean.UserBean" %> <%-- Created by IntelliJ IDEA. User: 113 Date: 2020/10/2 Time: 10:40 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <% UserBean user = new UserBean(); user.setUsername(request.getParameter("username")); user.setPassword(request.getParameter("password")); Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection = DriverManager.getConnection(url); Statement stmt = connection.createStatement(); String sql = "delete from user where id = 3"; int count = stmt.executeUpdate(sql); //如果报此行有错误 数码上一行的sql语句是有问题的 请检查数据库 if(count == 0 ){ out.print("更新失败"); }else { out.print("更新成功"); } %>五、home.jsp
<%@ page import="java.sql.*" %> <%-- Created by IntelliJ IDEA. User: 113 Date: 2020/10/7 Time: 8:03 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>201819101036李佳</title> </head> <body> <% Class.forName("com.mysql.jdbc.Driver"); String url="jdbc:mysql://localhost:3306/book"; Connection connection = DriverManager.getConnection(url,"root","root"); String sql ="select * from user where username = ? and password=?"; PreparedStatement ps = connection.prepareStatement(sql); ps.setString(1,request.getParameter("username")); ps.setString(2,request.getParameter("password")); ResultSet rs=ps.executeQuery(sql); while (rs.next()){ out.print(rs.getString("username")+"-"+rs.getString(3)+"<br>"); } %> </body> </html>六、更改-----register.jsp
<%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.media.bean.UserBean" %> <%-- Created by IntelliJ IDEA. User: 113 Date: 2020/10/2 Time: 10:40 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <% UserBean user = new UserBean(); user.setUsername(request.getParameter("username")); user.setPassword(request.getParameter("password")); Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://localhost:3306/book"; Connection connection = DriverManager.getConnection(url,"root","root"); Statement stmt = connection.createStatement(); //String sql="insert into user(username,password,gender,age)values('"+user.getUsername()+"','"+user.getPassword()+"',1,22)"; String sql="update user set status=3 where id=10"; // String sql = "delete from user where id = 3"; int count = stmt.executeUpdate(sql); //如果报此行有错误 数码上一行的sql语句是有问题的 请检查数据库 if(count == 0 ){ out.print("更新失败"); }else { out.print("更新成功"); } %>七、增加-------register.jsp
<%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.media.bean.UserBean" %> <%-- Created by IntelliJ IDEA. User: 113 Date: 2020/10/2 Time: 10:40 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <% UserBean user = new UserBean(); user.setUsername(request.getParameter("username")); user.setPassword(request.getParameter("password")); Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://localhost:3306/book"; Connection connection = DriverManager.getConnection(url,"root","root"); Statement stmt = connection.createStatement(); String sql="insert into user(username,password,gender,age)values('"+user.getUsername()+"','"+user.getPassword()+"',1,22)"; //String sql="update user set status=3 where id=10"; // String sql = "delete from user where id = 3"; int count = stmt.executeUpdate(sql); //如果报此行有错误 数码上一行的sql语句是有问题的 请检查数据库 if(count == 0 ){ out.print("更新失败"); }else { out.print("更新成功"); } %>