Jsp servlet 值传递。。

Posted 2020-08-19 zhouixi

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篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Jsp servlet 值传递。。相关的知识，希望对你有一定的参考价值。

先新建一个动态WEB项目。

展开WebRoot/index.jsp

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 3 <html>
 4 <body>
 5 <form action="${pageContext.request.contextPath}/Controller/servlet_Con" method="post">
 6 用户名：<input type="text" name="username">
 7 密 码：<input type="password" name="password">
 8 <input type="Submit" value="提交" name="Submit" >
 9 </form>
10 </body>
11 </html>

新建一个servlet.

 1 package Controller;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 //火影
10 public class servlet_Con extends HttpServlet {
11     private static final long serialVersionUID = 1L;
12     private String message;
13     public void doGet(HttpServletRequest request, HttpServletResponse response)
14             throws ServletException, IOException {
15         
16         String name= request.getParameter("username");
17         String password=request.getParameter("password");
18         if("admin".equals(name)&&"123".equals(password))
19         {
20             message="密码正确，跳转成功";
21             System.out.println(message);
22             request.setAttribute( "message",message);
23             request.getRequestDispatcher("/success/success.jsp").forward(request, response);
24         }
25         else
26         {
27             message="用户名或密码错误，跳转错误";
28             System.out.println(message);
29             request.setAttribute( "message",message);
30             request.getRequestDispatcher("/error/error.jsp").forward(request, response);
31         }
32     }
33     public void doPost(HttpServletRequest request, HttpServletResponse response)
34             throws ServletException, IOException {
35         this.doGet(request, response);
36 
37     }
38 
39 }

分别建立两个。success.jsp error.jsp文件。用于，跳转页面。

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3 String path = request.getContextPath();
 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9   <head>
10     <base href="<%=basePath%>">
11     <title>My JSP \'error.jsp\' starting page</title>
12   </head>
13   <body>
14   ${message }//接收servlet过来的值。
15     <br> 
16   </body>
17 </html>

测试：

1.先访问看看。