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:
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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();
}
}
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运行结果:
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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。