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HTTPRequest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：
publicclassTestURL{
publicstaticvoidmain(String[]args){
StringdestURLStr="http://www.baidu.com";
URLdestURL=null;
URLConnectionurlCon=null;
HttpURLConnectionhttpUrlCon=null;
StringreadResFile="C:/Users/zhoujw/Desktop/readResFile.html";
BufferedWriterbw=null;
try{
bw=newBufferedWriter(newFileWriter(readResFile));
destURL=newURL(destURLStr);
urlCon=destURL.openConnection();
httpUrlCon=(HttpURLConnection)urlCon;
//setrequestproperty
httpUrlCon.setRequestProperty("Accept-Encoding","gzip,deflate,sdch");
//可根据需要添加自定义请求头
httpUrlCon.setRequestProperty("TestHeader1","test1");
httpUrlCon.setRequestProperty("TestHeader2","test2");
httpUrlCon.connect();
BufferedReaderbr=newBufferedReader(newInputStreamReader(httpUrlCon.getInputStream(),"gbk"));
Stringwebpage=null;
while(((webpage=br.readLine())!=null))
{
//System.out.println(webpage);
bw.write(webpage);
bw.flush();
}
//debug
System.out.println("SelfDefineHeaders:");
System.out.println("TestHeader1:"+httpUrlCon.getRequestProperty("TestHeader1"));
System.out.println("TestHeader2:"+httpUrlCon.getRequestProperty("TestHeader2"));
System.out.println();
//echorequestproperty
echoRequestHeaders(httpUrlCon);
//echoresponseproperty
echoResponseHeaders(httpUrlCon);
}catch(MalformedURLExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
publicstaticvoidechoRequestHeaders(HttpURLConnectionhttpUrlCon){
System.out.println("RequestHeaders:");
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();
}
publicstaticvoidechoResponseHeaders(HttpURLConnectionhttpUrlCon)throwsIOException{
System.out.println("ResponseHeaders:");
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：
SelfDefineHeaders: TestHeader1:test1 TestHeader2:test2 RequestHeaders: 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 ResponseHeaders: HTTP/1.1200OK status:200OK 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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