使用servlet获取所有请求头

Posted on 2013-09-30 Edited on 2020-12-04 In java

使用servlet获取HTTP请求中的所有请求头

源代码
PrintRequestHeaders.java

[java]
import java.io.PrintWriter;
import java.io.IOException;
import java.util.Enumeration;
import javax.servlet.annotation.WebServlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = “printHeaders”, urlPatterns = {“/printHeaders”}, loadOnStartup = 1)
public class PrintRequestHeaders extends HttpServlet {

@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {

printHeader(request, response);
}

@Override
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {

printHeader(request, response);
}

public void printHeader(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {

response.setContentType(“text/html”);

PrintWriter out = response.getWriter();
out.println(““);
out.println(“Request Headers“);
out.println(““);
out.println(“

“);
out.println(““);

String header = null;
Enumeration e = request.getHeaderNames();
while(e.hasMoreElements()) {
header = e.nextElement();
if(header != null){
out.println(“

“);
out.println(““);
}
}

out.println(“

Header	Value
“ + header + “	“ + request.getHeader(header) + “

“);
out.println(““);
}
}
[/java]

输出
chrome浏览器输出

Header

Value

host

127.0.0.1

connection

keep-alive

cache-control

max-age=0

text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8

user-agent

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.76 Safari/537.36

accept-encoding

gzip,deflate,sdch

accept-language

en-US,en;q=0.8

firefox浏览器输出：