获取URL相关信息

import java.net.URL;import java.net.URLConnection;import java.net.ConnectException;import java.io.IOException;import java.util.Date;import java.net.HttpURLConnection;public class GetURLInfo{ ???public static void printInfo(URL url){ ???????System.out.println("==================URL info=================="); ???????//URL基本信息 ???????System.out.println("File ["+url.getFile()+"]"); ???????System.out.println("Protocol ["+url.getProtocol()+"]"); ???????System.out.println("Authority ["+url.getAuthority()+"]"); ???????System.out.println("DefaultPort ["+url.getDefaultPort()+"]"); ???????System.out.println("Host ["+url.getHost()+"]"); ???????System.out.println("Path ["+url.getPath()+"]"); ???????System.out.println("Port ["+url.getPort()+"]"); ???????System.out.println("Query ["+url.getQuery()+"]"); ???????System.out.println("Ref ["+url.getRef()+"]"); ???????System.out.println("UserInfo ["+url.getUserInfo()+"]"); ???????????????URLConnection c = null; ???????try{ ???????????c = url.openConnection(); ???????????System.out.println("==================URLConnection info=================="); ???????????//显示信息 ???????????System.out.println("ContentType [" + c.getContentType() + "]"); ???????????System.out.println("ContentEncoding [" + c.getContentEncoding() + "]"); ???????????System.out.println("Content [" + c.getContent() + "]"); ???????????System.out.println("ContentLength [" + c.getContentLength() + "]"); ???????????System.out.println("Date [" + new Date(c.getDate()) + "]"); ???????????System.out.println("LastModified [" + new Date(c.getExpiration()) + "]"); ???????????System.out.println("Expiration [" + new Date(c.getLastModified()) + "]"); ???????????????????if(c instanceof HttpURLConnection){ ???????????????System.out.println("==================HttpURLConnection info=================="); ???????????????HttpURLConnection httpURL = (HttpURLConnection)c; ???????????????System.out.println("RequestMethod [" + httpURL.getRequestMethod() + "]"); ???????????????System.out.println("ResponseMessage [" + httpURL.getResponseMessage() + "]"); ???????????????System.out.println("ResponseCode [" + httpURL.getResponseCode() + "]"); ???????????????} ???????????}catch(IOException e){ ???????????e.printStackTrace(); ???????????} ???????} ???????????public static void main(String[] args){ ???????try{ ???????????String urlStr = "http://www.sina.com.cn:80/index.html"; ???????????URL url = new URL(urlStr); ???????????printInfo(url); ???????}catch(Exception e){ ???????????System.err.println(e); ???????????} ???????} ???}