JAVA获取HTTP请求头的方法示例

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();  }}

Self Define Headers: Test Header1: test1 Test Header2: test2Request 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-Alivehttp://www.baidu.comResponse 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