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连接mysql利用jsp实现简单的登陆操作

 1 <%@page contentType="text/html" pageEncoding="UTF-8" %>
 2 <html>
 3 <head>
 4 
 5 
 6 </head>
 7 
 8 <body>
 9     <center>
10         <h1>登陆操作!</h1>
11     </center>
12     <hr>
13     <form action="login_check.jsp" method="post">
14         <table border="1">
15             <tr>
16                 <td colspan="2">用户登陆</td>
17 
18             </tr>
19             <tr>
20                 <td>登陆 ID:</td>
21                 <td><input type="text" name="id">
22                 </td>
23             </tr>
24 
25             <tr>
26                 <td>登陆密码:</td>
27                 <td><input type="password" name="password">
28                 </td>
29             </tr>
30 
31             </tr>
32 
33             <tr>
34                 <td colspan="2"><input type="submit" value = "登陆!">
35                 <td colspan="2"><input type="reset" value = "重置!">
36                 </td>
37             </tr>
38         </table>
39 
40     </form>
41 </body>
42 </html>

login_check.jsp

 1 <%@page contentType="text/html" pageEncoding="UTF-8" %>
 2 <%@page import="java.sql.*"%>
 3 
 4 
 5 <html>
 6 <head>
 7 </head>
 8 
 9 <body>
10     <center>
11         <h1>登陆操作</h1>
12     </center>
13     <hr>
14     <%!//定义若干个数据库连接常量
15     public static final String DBDRIVER = "org.gjt.mm.mysql.Driver";
16     public static final String DBURL = "jdbc:mysql://localhost:3306/zhw";
17     public static final String DBUSER = "root";
18     public static final String DBPASS = "root";
19     boolean flag = false;
20     String name = null;
21  %>
22     <%
23      Connection conn = null;  //数据库连接
24      PreparedStatement pstmt = null;    //数据库预处理操作
25      ResultSet rs = null;    //查询要处理结果集
26   %>
27     <%
28  
29   try{
30   
31   %>
32     <%
33        Class.forName(DBDRIVER);
34        conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);
35       
36        String sql = "select name from user where userid = ? and password = ?";
37          pstmt = conn.prepareStatement(sql);
38        pstmt.setString(1, request.getParameter("id"));
39       
40 
41        pstmt.setString(2, request.getParameter("password"));
42 
43        rs = pstmt.executeQuery();
44 
45        if(rs.next()){//如果有数据就执行
46 
47            flag = true;//表示登陆成功
48            name = rs.getString(1);
49            
50        }
51         System.out.println("如果有数据就执行22");
52    %>
53 
54     <%
55    }catch(Exception e){
56        e.printStackTrace();
57    }finally{
58        try{
59            rs.close();
60            pstmt.close();
61            conn.close();
62        }catch(Exception e){
63        
64        e.printStackTrace();
65        }
66    
67    }
68    
69     %>
70 
71     <%
72         if(flag == true){
73     %>
74     <jsp:forward page="login_success.jsp">
75         <jsp:param name="uname" value="<%=name %>" />
76     </jsp:forward>
77 
78     <%    
79         }else{
80          %>
81 
82 
83     <jsp:forward page="login_failure.jsp"/>
84 
85 
86     <%    
87          
88         }
89         
90      %>
91 
92 </body>
93 </html>

login_success.jsp

 1 <%@page contentType = "text/html" pageEncoding="GBK" %>
 2 <html>
 3   <head>
 4 
 5 
 6   </head>
 7   
 8   <body>
 9     <center>
10         <h1>登陆操作</h1>
11         <h2>登陆成功</h2>
12         <h3>welcome!!!!<font color = "red" ><%= request.getParameter("uname") %></font></h3>
13     
14     </center>
15   </body>
16 </html>

login_failure.jsp

 1 <%@ page contentType="text/html" pageEncoding="GBK"%>
 2 
 3 <html>
 4   <head>
 5 
 6 
 7   </head>
 8   
 9   <body>
10 <center>
11 
12 <h1>登陆失败!!!!!!</h1>
13     <h2><a href= "login.jsp">点击重新登陆!!!!!!!!</a></h2>
14 </center>
15   </body>
16 </html>

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原文地址：https://www.cnblogs.com/elleniou/p/2680418.html