java 获取响应头response header

package com.bighai.forTest;

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Set;

public class CheckHttpResposneHeaders {
public static void main(String[] args) throws IOException{
URL url = new URL("http://pic.qihoo.com/belle/belle182.html");
URLConnection conn = url.openConnection();

Map headers = conn.getHeaderFields();
Set<String> keys = headers.keySet();
for( String key : keys ){
String val = conn.getHeaderField(key);
System.out.println(key+" "+val);
}

System.out.println( conn.getLastModified() );
}
}

URLConnection还有一些方法可以研究，跟http通信有关的。