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Eclipse MySql之登录

發布時間：2025/3/12 编程问答 28 豆豆

生活随笔收集整理的這篇文章主要介紹了 Eclipse MySql之登录小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

用Eclipse連接MySql數據庫實現登陸的功能。

功能分析
1.MySql數據庫的連接
2.判斷輸入的內容是否為空
3.判斷輸入的內容是否與數據庫的內容相同
4.重定向的使用

效果演示

原始樣式

當賬戶或者密碼任何一個是空的時候點擊登錄會彈框

一 MySql數據庫

我的數據庫名school
我的數據表名login

二程序詳解

在開始我們的程序之前一定注意：
導入mysql-connector-java-5.1.39-bin.jar架包和jquery.jar架包。

我們有必要先看一下目錄結構

代碼展示

LoginServlet.java

package com.zsh.servlet;import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import com.zsh.util.DBUtil;public class LoginServlet extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setCharacterEncoding("utf-8");String name = request.getParameter("name");String pwd = request.getParameter("pwd");boolean flag = false;Connection conn = DBUtil.getConn();PreparedStatement ps = null;ResultSet rs = null;String sql = "select * from login where name = ? and pwd = ?";try {ps = conn.prepareStatement(sql);ps.setString(1, name);ps.setString(2, pwd);rs = ps.executeQuery();if(rs.next()){flag = true;}else{flag = false;}} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{DBUtil.closeConn(conn, ps, rs);}if(flag){response.sendRedirect("success.jsp");}else{response.sendRedirect("login.jsp");}}}

DBUtil.java

package com.zsh.util;import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException;public class DBUtil {public static Connection getConn(){Connection conn = null;String url = "jdbc:mysql://localhost:3306/school";String user = "root";String pwd = "111";try {Class.forName("com.mysql.jdbc.Driver");conn = DriverManager.getConnection(url, user, pwd);} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public static void closeConn(Connection conn, PreparedStatement ps, ResultSet rs){if(conn!=null){try {conn.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(ps!=null){try {ps.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if(rs!=null){try {rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}

JSP頁面

login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><script src="jquery.js"></script></head><style>#all{width: 300px;height: 200px;margin-top: 100px;}input{margin-top: 20px;}</style><body><center><div id="all"><form action="login" method="post">賬號：<input type="text" name="name" id="name"><br>密碼：<input type="password" name="pwd" id="pwd"><br><input type="submit" value="登錄"></form></div></center></body><script>$("form").submit(function(){var name = $("#name").val();var pwd = $("#pwd").val();var nameFlag = false;var pwdFlag = false;if(name == "" || name == "undefined"){nameFlag = false;alert("賬戶不能為空！");}else{nameFlag = true;}if(pwd == "" || pwd == "undefined"){pwdFlag = false;alert("密碼不能為空！");}else{pwdFlag = true;}if(nameFlag == false || pwdFlag == false){return false;}else{return true;}})</script> </html>

success.jsp

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