jsp 實慄 jsp + jdbc 登陸

時間 2019-11-16

標籤 jsp jdbc 登陸欄目 JSP 简体版

原文原文鏈接

jsp 實慄 jsp + jdbc 實現登陸html

實現思路

一個表單頁，輸入用戶登陸和密碼，而後信息提交到jsp頁面進行驗證，若是能夠服務器跳轉到登陸成功頁，失敗，跳轉到錯誤頁java

跳轉的時候窗口的URL地址會發生變化

代碼以下

編寫登陸代碼mysql

　登陸

<!DOCTYPE html>
<html lang="zh_CN">
<head>
    <meta charset="UTF-8">
    <title>登陸</title>
</head>
<body>
    <h1>登陸操做</h1>
    <form action="login_check.jsp" method="post">
        <h1>用戶登陸</h1>
        <p>
            登陸id
            <input type="text" name="id"/>
        </p>
        <p>
            登陸密碼
            <input type="password" name="password"/>
        </p>
        <input type="submit" value="登陸"/>
        <input type="reset" value="重置"/>
    </form>
</body>
</html>

登陸處理

<%@ page import="java.sql.*" %>
<%--
  Created by IntelliJ IDEA.
  User: ming
  Date: 19-3-9
  Time: 下午5:50
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%!
    // 數據庫驅動程序
    public static final String DBDRIVER = "com.mysql.cj.jdbc.Driver";
    // 數據庫鏈接地址
    public static final String DBURL = "jdbc:mysql://47.94.95.84:32786/test";
    // 用戶名
    public static final String DBUSER = "root";
    // 密碼
    public static final String DBPASS = "ABCcba20170607";
%>
<%
    // 鏈接對象
    Connection connection = null;
    // 操做
    PreparedStatement preparedStatement = null;
    // 結果
    ResultSet resultSet = null;
    // 標誌位
    boolean falge = false;
    // 用戶真實姓名
    String name = null;
%>
<%
    try{
        Class.forName(DBDRIVER);
        // 得到鏈接
        connection = DriverManager.getConnection(DBURL, DBUSER, DBPASS);
        // 編寫sql驗證ID 密碼
        String sql = "SELECT name FROM user WHERE userid = ? AND password = ?";
        // 實例化操做對象
        preparedStatement = connection.prepareStatement(sql);
        // 設置查詢內容
        preparedStatement.setString(1, request.getParameter("id"));
        preparedStatement.setString(2, request.getParameter("password"));
        // 執行查詢
        resultSet = preparedStatement.executeQuery();
        // 若是能夠查詢到，表示合法用戶
        if(resultSet.next()){
            name = resultSet.getString(1);
            // 修改標誌位
            falge = true;
        }
    }catch (Exception e){
        e.printStackTrace();
    }finally {
        try{
            resultSet.close();
            preparedStatement.close();
            connection.close();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
%>
<%
    // 登陸成功
    if(falge){
    // 進行服務器端跳轉
%>
    <jsp:forward page="./login_sucess.jsp">
        <jsp:param name="uname" value="<%=name%>"/>
    </jsp:forward>
<%
    }else{
%>
    <jsp:forward page="./login_failure.html"/>
<%        
    }
%>
</body>
</html>

登陸完成

<%--
  Created by IntelliJ IDEA.
  User: ming
  Date: 19-3-9
  Time: 下午10:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>登陸成功</h1>
<%=request.getParameter("uname")%>
</body>
</html>

登陸失敗

<%--
  Created by IntelliJ IDEA.
  User: ming
  Date: 19-3-9
  Time: 下午10:22
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>登陸成功</h1>
<%=request.getParameter("uname")%>
</body>
</html>