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Servlet+MySQL使用DBCP数据库连接池实现用户登录

發布時間：2025/3/20 数据库 24 豆豆
生活随笔 收集整理的這篇文章主要介紹了 Servlet+MySQL使用DBCP数据库连接池实现用户登录 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

首先準備數據庫數據和登錄頁面
創建user數據表并且插入幾條數據

DROP TABLE IF EXISTS `user`; CREATE TABLE `user` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(50) DEFAULT NULL,`password` varchar(16) DEFAULT NULL,`email` varchar(30) DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;INSERT INTO `user` VALUES ('1', 'zhangsan', '123456', '1111@qq.com'); INSERT INTO `user` VALUES ('2', 'lisi', '123321', '2222@qq.com'); INSERT INTO `user` VALUES ('3', 'wangwu', '111222', '3333@qq.com');

登錄頁面index.html

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>login</title> </head> <body><h1>歡迎登陸</h1><form action="login" method="post">用戶名<input type="text" placeholder="請輸入用戶名" name="user"><br />密碼<input type="password" placeholder="請輸入密碼" name="pwd"> <inputtype="submit" value="登陸"></form> </body> </html>

JCDB工具類
注意先導入必要的jar包
DBUtil.java

package com.wangc.utils;import java.sql.Connection; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import org.apache.tomcat.dbcp.dbcp2.BasicDataSource;public class DBUtil {public static final String DRIVERNAME = "com.mysql.jdbc.Driver";public static final String URL = "jdbc:mysql://localhost:3306/javadata";//注意數據庫名public static final String USERNAME = "root";//使用自己的用戶名和密碼public static final String PASSWORD = "****";//使用自己的用戶名和密碼public static BasicDataSource bSource = null;static{bSource = new BasicDataSource();bSource.setDriverClassName(DRIVERNAME);bSource.setUrl(URL);bSource.setUsername(USERNAME);bSource.setPassword(PASSWORD);}public static Connection getConn(){try {return bSource.getConnection();} catch (SQLException e) {e.printStackTrace();}return null;}public static void release(Connection conn, Statement stat, ResultSet rs){if (rs != null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}if (stat != null) {try {stat.close();} catch (SQLException e) {e.printStackTrace();}}if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}} }

LoginServlet.java

package com.wangc.control;import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; 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 com.wangc.utils.DBUtil;@WebServlet("/login") public class LoginServlet extends HttpServlet {private static final long serialVersionUID = 1L;protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {Connection conn = null;ResultSet rs = null;PreparedStatement ps = null;response.setContentType("text/html");response.setCharacterEncoding("utf-8");try {conn = DBUtil.getConn();String sql = "select * from user where name=? and password=?";ps = conn.prepareStatement(sql);ps.setString(1, request.getParameter("user"));ps.setString(2, request.getParameter("pwd"));rs = ps.executeQuery();if (rs.next()) {response.getWriter().write("登陸成功！");}else {response.getWriter().write("登陸失敗！");}} catch (SQLException e) {e.printStackTrace();}finally {DBUtil.release(conn, ps, rs);}}}

測試一下
輸入
zhangsan
123456
點擊登錄

輸入
zhangsan
1234

GitHub地址

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