JAVA如何獲取HTTP請求頭

　　在利用Java網(wǎng)絡(luò)編程時，常常需要獲取HTTP請求頭，那么JAVA如何獲取HTTP請求頭呢？下面小編為大家介紹了JAVA獲取HTTP請求頭的方法，希望能幫到大家！

　　在利用Java網(wǎng)絡(luò)編程時，利用Java獲取HTTP Request 和 Response頭字段，可以利用Java語言根據(jù)需要添加自定義的HTTP頭字段，而不必拘泥于標(biāo)準(zhǔn)HTTP定義的頭字段。

　　代碼如下：

　　public class TestURL {

　　public static void main(String[] args) {

　　String destURLStr= "http://www.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");

　　//可根據(jù)需要添加自定義請求頭

　　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"));//利用另一種讀取HTTP頭字段

　　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"));//利用另一種讀取HTTP頭字段

　　System.out.println();

　　}

　　}

　　運行結(jié)果：

　　Self Define Headers:

　　Test Header1: test1

　　Test Header2: test2

　　Request Headers:

　　GET / HTTP/1.1

　　Host: www.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://www.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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