測試網絡是否連通

測試通過，對Url異常都做了簡單的捕獲。

package src;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class ConnTestUtil {

	public static boolean getContent(String ip) {
		return getContent(ip, 3000);

	}
	public static boolean getContent(String ip, int timeout) {
		URL url = null;
		URLConnection conn = null;
		BufferedReader in = null;
		try {
			url = new URL("http://" + ip);
			conn = url.openConnection();
			conn.setConnectTimeout(timeout);
			in = new BufferedReader(new InputStreamReader(
					conn.getInputStream(), "UTF-8"));

			if ((in.readLine()) != null) {
				in.close();
				System.out.println(ip + "--連接成功");
				return true;
			} else {
				in.close();
				return false;
			}

		} catch (MalformedURLException e) {
			System.err.println(ip + "--URL轉化異常");
			return false;
		} catch (IOException e) {
			System.err.println(ip + "--連接失敗");
			return false;
		} finally {
			conn = null;
			url = null;
		}
	}

	public static void main(String args[]) {
		System.out.println(getContent("192.168.1.153"));
		// System.out.println(getContent("www.baidu.com"));
		// System.out.println(12 % 20);
	}

}