JAVA获取HTTP请求头的方法示例

JAVA获取HTTP请求头的方法示例

本文实例讲述了java获取HTTP请求头的方法。分享给大家供大家参考，具体如下：

在利用Java网络编程时，利用Java获取HTTP Request 和 Response头字段；

可以利用Java语言根据需要添加自定义的HTTP头字段，而不必拘泥于标准HTTP定义的头字段。

代码如下：

public class TestURL {

public static void main(String[] args) {

String destURLjfKzHuUWStr= "http://baidu.com";

URL destURL = null;

URLConnection urlCon = null;

HttpURLConnection httpUrlCon= null;

String readResFile = "C:/Users/zhoujw/Desktop/readResFile.html";

BufferedWriter bw = null;

try {

bw = new BufferedWriter(new FileWriter(readResFile));

destURL = new URL(destURLStr);

urlCon = destURL.openConnection();

httpUrlCon = (HttpURLConnection)urlCon;

//set request property

httpUrlCon.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");

//可根据需要添加自定义请求头

httpUrlCon.setRequestProperty("Test Header1", "test1");

httpUrlCon.setRequestProperty("Test Header2", "test2");

httpUrlCon.connect();

BufferedReader br = new BufferedReader(new InputStreamReader(httpUrlCon.getInputStream(), "gbk"));

String webpage = null;

while((( webpage = br.readLine()) != null))

{

// System.out.println(webpage);

bw.write(webpage);

bw.flush();

}

//debug

System.out.println("Self Define Headers:");

System.out.println(" Test Header1: " + httpUrlCon.getRequestProperty("Test Header1"));

System.out.println(" Test Header2: " + httpUrlCon.getRequestProperty("Test Header2"));

System.out.println();

//echo request property

echoRequestHeaders(httpUrlCon);

//echo response property

echoResponseHeaders(httpUrlCon);

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public static void echoRequestHeaders(HttpURLConnection httpUrlCon){

System.out.println("Request Headers:");

System.out.println(" " + httpUrlCon.getRequestMethod() + " / " + " HTTP/1.1");

System.out.println(" Host: " + httpUrlCon.getRequestProperty("Host"));

System.out.println(" Connection: " + httpUrlCon.getRequestProperty("Connection"));

System.out.println(" Accept: " + httpUrlCon.getRequestProperty("Accept"));

System.out.println(" User-Agent: " + httpUrlCon.getRequestProperty("User-Agent"));

System.out.println(" Accept-Encoding: " + httpUrlCon.getRequestProperty("Accept-Encoding"));

System.out.println(" Accept-Language: " + httpUrlCon.getRequestProperty("Accept-Language"));

System.out.println(" Cookie: " + httpUrlCon.getRequestProperty("Cookie"));

System.out.println(" Connection: " + httpUrlCon.getHeaderField("Connection"));//利用另一种读取HTTP头字段

System.out.println();

}

public static void echoResponseHeaders(HttpURLConnection httpUrlCon) throws IOException{

System.out.println("Response Headers:");

System.out.println(" " + "HTTP/1.1 " + httpUrlCon.getResponseCode() + " " + httpUrlCon.getResponseMessage());

System.out.println(" status: " + httpUrlCon.getResponseCode() + " " + httpUrlCon.getResponseMessage());

System.out.println(" content-encoding: " + httpUrlCon.getContentEncoding());

System.out.println(" content-length : " + httpUrlCon.getContentLength());

System.out.println(" content-type: " + httpUrlCon.getContentType());

System.out.println(" Date: " + httpUrlCon.getDate());

System.out.println(" ConnectTimeout: " + httpUrlCon.getConnectTimeout());

System.out.println(" expires: " + httpUrlCon.getExpiration());

System.out.println(" content-type: " + httpUrlCon.getHeaderField("content-type"));//利用另一种读取HTTP头字段

System.out.println();

}

}

运行结果：

Self Define Headers:

Test Header1: test1

Test Header2: test2

Request Headers:

GET / HTTP/1.1

Host: baidu.com

Connection: keep-alive

Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2

User-Agent: Java/1.6.0_20

Accept-Encoding: gzip,deflate,sdch

Accept-Language: null

Cookie: null

Connection: Keep-Alive

http://baidu.com

Response Headers:

HTTP/1.1 200 OK

status: 200 OK

content-encoding: gzip

content-length : -1

content-type: text/html; charset=utf-8

Date: 1427817028000

ConnectTimeout: 0

expires: 1427817001000

content-type: text/html; charset=utf-8

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