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 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();
  }
}

运行结果：

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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希望本文所述对大家java程序设计有所帮助。