import java.net.URL;
public class URLAvailability {
private static URL url;
private static HttpURLConnection con;
private static int state = -1;
/**
* 功能：检测当前URL是否可连接或是否有效, 描述：最多连接网络 2 次, 如果 2 次都不成功，视为该地址不可用
*
* @param urlStr 指定URL网络地址
* @return URL
*/
public static synchronized boolean isConnect(String urlStr) {
int counts = 0;
if (urlStr == null || urlStr.length() <= 0) {
return false;
}
while (counts < 1) {
try {
url = new URL(urlStr);
con = (HttpURLConnection) url.openConnection();
state = con.getResponseCode();
System.out.println(counts + "= " + state);
if (state == 200) {
return true;
}
break;
} catch (Exception ex) {
counts++;
System.out.println("URL不可用，连接第 " + counts + " 次");
urlStr = null;
continue;
}
}
return false;
}
public static void main(String[] args) {
System.out.println(URLAvailability.isConnect("http://192.168.1.135:8000"));
System.out.println(URLAvailability.isConnect("http://192.168.1.131:8000"));
}
}