[JAVA]判斷網址是否可用 使用HttpURLConnection

直接看程式碼：

package com.test;

import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.net.URL;

public class SampleforTestURL {

  public static void main(String s[]) {
   System.out.println(exists("http://www.google.com.tw"));
   System.out.println(exists("http://www.yahoo.com.tw"));
   System.out.println(exists("http://www.yam.com.tw"));
  }

  static boolean exists(String URLName) {
   try {
    HttpURLConnection.setFollowRedirects(true);
    // note : you may also need
    // HttpURLConnection.setInstanceFollowRedirects(false)
    HttpURLConnection con = (HttpURLConnection) new URL(URLName)
      .openConnection();
    con.setConnectTimeout(5000); // set timeout to 5 seconds
    con.setReadTimeout(5000);  // set read timeout to 5 seconds
    con.setRequestMethod("HEAD");
    return (con.getResponseCode() == HttpURLConnection.HTTP_OK);
   } catch (SocketTimeoutException e) {
    return false;
   } catch (Exception e) {
    e.printStackTrace();
    return false;
   }
  }
}