演示获取请求头信息

package com.javaweb.httprequest;

//演示获取请求头信息

import java.io.IOException;

import java.util.Enumer
4000
ation;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class ServletRequestQingqiutou

 */

@WebServlet("/servletRequestQingqiutou")

public class ServletRequestQingqiutou extends HttpServlet {
private static final long serialVersionUID = 1L;

       

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ServletRequestQingqiutou() {

        super();

        // TODO Auto-generated constructor stub

    }

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取单个请求头信息
String s=request .getHeader("Accept-Encoding");
System.out.println(s);
//获取同名的请求头的多个值
Enumeration<String >enu=request.getHeaders("Accept-Encoding");
while (enu.hasMoreElements()) {
System.out.println(enu.nextElement());

}
//拿到所有的请求头和值
Enumeration<String > enu1=request.getHeaderNames();
while (enu1.hasMoreElements()) {
String key=enu1.nextElement();
System.out.println(key+":"+request.getHeader(key));
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}