Request_获取请求头数据

获取请求头数据
           * 方法：
               * (*)String getHeader(String name):通过请求头的名称获取请求头的值
               * Enumeration<String> getHeaderNames():获取所有的请求头名称

package com.learn.web.request;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;@WebServlet("/requestDemo2")
public class RequestDemo2 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//演示获取请求头数据//1.获取所有请求头名称Enumeration<String> headerNames = request.getHeaderNames();//2.遍历while(headerNames.hasMoreElements()){String name = headerNames.nextElement();//根据名称获取请求头的值String value = request.getHeader(name);System.out.println(name+"---"+value);}}
}

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><form action="/demo3" method="POST"><input name="username"><input type="submit" value="提交"></form>
<hr><a href="/day12/requestDemo4">demo4...</a></body>
</html>

package com.learn.web.request;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Enumeration;@WebServlet("/requestDemo3")
public class RequestDemo3 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//演示获取请求头数据:user-agentString agent = request.getHeader("user-agent");//判断agent的浏览器版本if(agent.contains("Chrome")){//谷歌System.out.println("谷歌来了...");}else if(agent.contains("Firefox")){//火狐System.out.println("火狐来了...");}}
}

package com.learn.web.request;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;@WebServlet("/requestDemo4")
public class RequestDemo4 extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//演示获取请求头数据:refererString referer = request.getHeader("referer");System.out.println(referer);//http://localhost/day14/login.html//防盗链if(referer != null ){if(referer.contains("/day12")){//正常访问// System.out.println("播放电影....");response.setContentType("text/html;charset=utf-8");response.getWriter().write("播放电影....");}else{//盗链//System.out.println("想看电影吗？来优酷吧...");response.setContentType("text/html;charset=utf-8");response.getWriter().write("想看电影吗？来优酷吧...");}}}
}

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><a href="http://localhost/day12/requestDemo4">高清电影</a>
</body>
</html>

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