package com.cqust;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
//模拟用户登录,验证成功还是失败
public class JDBCTest05 {
public static void main(String[] args) throws Exception {
//初始化界面,返回用户输入的信息,使用map集合存储
Map
}
/**
* 用户登录界面
* @return 返回用户的信息,存在集合中
*/
public static Map<string,string> initLogin(){
Map<string,string> userInfo = new HashMap<>();
System.out.print("请输入你的用户名:");
Scanner scanner = new Scanner(System.in);
String username = scanner.next();
System.out.print("请输入你的密码:");
String userpwd = scanner.next();
userInfo.put("username",username);
userInfo.put("userpwd",userpwd);
return userInfo;
}
/**
* 使用jdbc技术完成登录检测
* @param map 用户的信息存储在集合map中
* @return 最后返回登录成功还是失败
* @throws Exception 这里为了省点劲直接throws
*/
public static boolean login(Map<string,string> map) throws Exception{
String username = map.get("username");
String userpwd = map.get("userpwd");
boolean loginInfo = false;
//1.注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2.获取连接
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/cqust_db",
"root","hch1");
//3.获取数据库操作对象
Statement statement = connection.createStatement();
//4.写sql,执行sql
String sql = "select username,userpwd from t_user_login where username = '"+username+"' and userpwd = '"+userpwd+"'";
ResultSet resultSet = statement.executeQuery(sql);
//5.这里只需要看是否有数据,如果查询到数据,则登录成功,直接loginInfo = true;
if (resultSet.next()){
loginInfo = true;
}
//6.关闭资源
if (resultSet!=null){
resultSet.close();
}
if (statement!=null){
statement.close();
}
if (connection!=null){
connection.close();
}
return loginInfo;
}
</string,string></string,string></string,string>
}
Original: https://www.cnblogs.com/journeyhch/p/15573926.html
Author: journeyhch
Title: jdbc-实现用户登录业务(存在sql注入)
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