1.目标：将http中的请求头全部打印在Console中
2.基本语句
???????//1.获得指定的头 ???????String header = response.getHeader("User-Agert"); ???????System.out.println(header); ???????????????//2.获得所有头的名称 ???????Enumeration<String> headerNames = request.getHeaderNames(); ???????while(headerNames.hasMoreElements()) {//判断是否还有下一个元素 ???????????String nextElement = headerNames.nextElement();//获取headerNames集合中的请求头 ???????????String header2 = request.getHeader(nextElement);//通过请求头得到请求内容 ???????????System.out.println(nextElement+":"+header2);3.运行结果
4.完整代码
package com.hdh.requesd;import java.io.IOException;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 requestHead extends HttpServlet { ???protected void doGet(HttpServletRequest request, HttpServletResponse response) ???????????throws ServletException, IOException { ???????// 1.获得指定的头 ???????String header = response.getHeader("User-Agert"); ???????System.out.println(header); ???????// 2.获得所有头的名称 ???????Enumeration<String> headerNames = request.getHeaderNames(); ???????while (headerNames.hasMoreElements()) {// 判断是否还有下一个元素 ???????????String nextElement = headerNames.nextElement();// 获取headerNames集合中的请求头 ???????????String header2 = request.getHeader(nextElement);// 通过请求头得到请求内容 ???????????System.out.println(nextElement + ":" + header2); ???????} ???} ???protected void doPost(HttpServletRequest request, HttpServletResponse response) ???????????throws ServletException, IOException { ???????doGet(request, response); ???}}http所有请求头在Console中打印
原文地址：https://www.cnblogs.com/asndxj/p/9822778.html