Java 实例以下实例演示了如何获取指定 URL 的响应头信息：
Main.java 文件
import java.io.IOException;import java.net.URL;import java.net.URLConnection;import java.util.Map;import java.util.Set; public class Main { public static void main(String[] args) throws IOException{ URL url = new URL("http://www.zhishitu.com"); 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() ); }}
以上代码运行输出结果为：
Transfer-Encoding chunkednull HTTP/1.1 200 OKServer Tengine/1.3.0Connection keep-aliveVary CookieDate Mon, 04 May 2015 03:54:05 GMTX-Pingback http://www.zhishitu.com/xmlrpc.phpX-Powered-By PHP/5.3.15Content-Type text/html; charset=UTF-8