Servlet--获取Http协议请求头信息

Servlet--获取Http协议请求头信息

一、创建一个webproject项目实现获取请求头信息

1、创建一个GetServlet类，继承HttpServlet通过doGet请求来获取协议请求头信息。

  

   

    

     

    
    

     

      package tests06_2;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import java.io.IOException;
     
    
   

    

     

    
    

     

      import java.io.PrintWriter;
     
    
   

    

     

    
    

     

      import java.util.Enumeration;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      import javax.servlet.ServletException;
     
    
   

    

     

    
    

     

      import javax.servlet.http.HttpServlet;
     
    
   

    

     

    
    

     

      import javax.servlet.http.HttpServletRequest;
     
    
   

    

     

    
    

     

      import javax.servlet.http.HttpServletResponse;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      public class GetServlet extends HttpServlet {
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     
	public void doGet(HttpServletRequest request, HttpServletResponse response)
     
    
   

    

     

    
    

     
			throws ServletException, IOException {
     
    
   

    

     

    
    

     
		
     
    
   

    

     

    
    

     

      			System.out.println("请求首行信息");
     
    
   

    

     

    
    

     
			String type = request.getMethod();
     
    
   

    

     

    
    

     
			String url = request.getRequestURI();
     
    
   

    

     

    
    

     
			String protocol = request.getProtocol();
     
    
   

    

     

    
    

     

      			System.out.println("首行信息："+type+url+protocol);
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     

      			System.out.println("请求头信息");
     
    
   

    

     

    
    

     

      			System.out.println("---下面是根据一个指定的头获取指定值--");
     
    
   

    

     

    
    

     
			String accept = request.getHeader("accept");
     
    
   

    

     

    
    

     

      			System.out.println("accept信息："+accept);
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     

      			System.out.println("-------下面是获取所有的头Head信息----------");
     
    
   

    

     

    
    

     

      			Enumeration <String> enumer = request.getHeaderNames();
     
    
   

    

     

    
    

     
			while(enumer.hasMoreElements()){
     
    
   

    

     

    
    

     
				String key = enumer.nextElement();
     
    
   

    

     

    
    

     

      				System.out.println(key+"=="+request.getHeader(key));
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     
	
     
    
   

    

     

    
    

     
	public void doPost(HttpServletRequest request, HttpServletResponse response)
     
    
   

    

     

    
    

     
			throws ServletException, IOException {
     
    
   

    

     

    
    

     
			
     
    
   

    

     

    
    

     

      			}
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      }
     
    
  
 

2、web.xml配置信息如下：

  

   

    

     

    
    

     

      <?xml version="1.0" encoding="UTF-8"?>
     
    
   

    

     

    
    

     

      <web-app version="3.0"
     
    
   

    

     

    
    

     
    xmlns="http://java.sun.com/xml/ns/javaee"
     
    
   

    

     

    
    

     
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     
    
   

    

     

    
    

     
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
     
    
   

    

     

    
    

     
  <servlet>
     
    
   

    

     

    
    

     
    <description>This is the description of my J2EE component</description>
     
    
   

    

     

    
    

     
    <display-name>This is the display name of my J2EE component</display-name>
     
    
   

    

     

    
    

     
    <servlet-name>GetServlet</servlet-name>
     
    
   

    

     

    
    

     
    <servlet-class>tests06_2.GetServlet</servlet-class>
     
    
   

    

     

    
    

     
  </servlet>
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     
  <servlet-mapping>
     
    
   

    

     

    
    

     
    <servlet-name>GetServlet</servlet-name>
     
    
   

    

     

    
    

     
    <url-pattern>/getservlet</url-pattern>
     
    
   

    

     

    
    

     
  </servlet-mapping>
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      </web-app>
     
    
  
 

3、在index.jsp文件写一个简单的超链接，发送doGet请求

  

   

    

     

    
    

     

      <%@ 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">
     
    
   

    

     

    
    

     
	<!--
     
    
   

    

     

    
    

     

       <link rel="stylesheet" type="text/css" href="styles.css">
     
    
   

    

     

    
    

     

       -->
     
    
   

    

     

    
    

     
  </head>
     
    
   

    

     

    
    

     
  
     
    
   

    

     

    
    

     
  <body>
     
    
   

    

     

    
    

     

          This is my JSP page. <br>
     
    
   

    

     

    
    

     
    <!-- 点击doget发送请求跳转到请求页面 -->
     
    
   

    

     

    
    

     
    <a href="http://localhost:8080/test06_2/getservlet">doGet请求</a>
     
    
   

    

     

    
    

     
  </body>
     
    
   

    

     

    
    

     

      </html>
     
    
  
 

4、测试结果

在浏览器中输入地址 （http://localhost:8080/test06_2/）访问项目首页，并在首页点击goGet请求按钮。查看myeclipse控制台输出请求头信息。

文章来源: brucelong.blog.csdn.net，作者：Bruce小鬼，版权归原作者所有，如需转载，请联系作者。

原文链接：brucelong.blog.csdn.net/article/details/75317345