生活随笔
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Request_获取请求头数据
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? ? ? ? 獲取請求頭數據
?? ??? ??? ?* 方法：
?? ??? ??? ??? ?* (*)String getHeader(String name):通過請求頭的名稱獲取請求頭的值
?? ??? ??? ??? ?* Enumeration<String> getHeaderNames():獲取所有的請求頭名稱
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 {//演示獲取請求頭數據//1.獲取所有請求頭名稱Enumeration<String> headerNames = request.getHeaderNames();//2.遍歷while(headerNames.hasMoreElements()){String name = headerNames.nextElement();//根據名稱獲取請求頭的值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 {//演示獲取請求頭數據:user-agentString agent = request.getHeader("user-agent");//判斷agent的瀏覽器版本if(agent.contains("Chrome")){//谷歌System.out.println("谷歌來了...");}else if(agent.contains("Firefox")){//火狐System.out.println("火狐來了...");}}
}
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 {//演示獲取請求頭數據:refererString referer = request.getHeader("referer");System.out.println(referer);//http://localhost/day14/login.html//防盜鏈if(referer != null ){if(referer.contains("/day12")){//正常訪問// System.out.println("播放電影....");response.setContentType("text/html;charset=utf-8");response.getWriter().write("播放電影....");}else{//盜鏈//System.out.println("想看電影嗎？來優酷吧...");response.setContentType("text/html;charset=utf-8");response.getWriter().write("想看電影嗎？來優酷吧...");}}}
}
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body><a href="http://localhost/day12/requestDemo4">高清電影</a>
</body>
</html>
?
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