检测网页地址有效性java代码

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package com.inspur.linkcheck;   import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL;   public class LinkCheck {     public static void main(String[] args) {         System.out.println(checkUrl("http://202.110.193.23:8000/zrqd/themes/default/skins/images/bg_body_footer.png"));     }           public static boolean checkUrl(String url_s) {         try {             URL url = new URL(url_s);             HttpURLConnection conn = (HttpURLConnection) url.openConnection();             /**              * public int getResponseCode()throws IOException 从 HTTP 响应消息获取状态码。              * 例如，就以下状态行来说： HTTP/1.0 200 OK HTTP/1.0 401 Unauthorized 将分别返回 200              * 和 401。 如果无法从响应中识别任何代码（即响应不是有效的 HTTP），则返回 -1。              *              * 返回 HTTP 状态码或 -1              */             int state = conn.getResponseCode();             System.out.println(state);             if (state == 200) {                 return true;             } else {                 System.out.println("invalid: " + url_s);                 return false;             }         } catch (IOException e) {             return false;         }     }       }