Java 实例 - 获取 URL 响应头信息

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.runoob.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    chunked
null    HTTP/1.1 200 OK
Server    Tengine/1.3.0
Connection    keep-alive
Vary    Cookie
Date    Mon, 04 May 2015 03:54:05 GMT
X-Pingback    http://www.runoob.com/xmlrpc.php
X-Powered-By    PHP/5.3.15
Content-Type    text/html; charset=UTF-8