java中如何检测的URL是否存在呢?

实现思路:
    使用 java.net.URL类即可检测一个URL是否存在

import java.net.URL;
import java.net.MalformedURLException;
 
public class URLInString {
    public static void main(String[] args) {
        String s = args[0];
  
        String [] parts = s.split("\\s+");

        // Attempt to convert each item into an URL.   
        for( String item : parts ) try {
            URL url = new URL(item); 
            System.out.print("<a href=\"" + url + "\">"+ url + "</a> " );    
        } catch (MalformedURLException e) { 
            System.out.print( item + " " );
        }

        System.out.println();
    }
}