Java如何爬起一个url呢？

实现思路:
       使用URL类中的相关方法，即可抓取网页
例: 

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.net.URL;

public class testClass {
   public static void main(String[] args) 
   throws Exception {
      URL u= new URL("http://www.java265.com");
      BufferedReader reader = new BufferedReader(new InputStreamReader(u.openStream()));
      BufferedWriter writer = new BufferedWriter(new FileWriter("java265.html"));
     
      String line;
      while ((line = reader.readLine()) != null) {
         System.out.println(line);
         writer.write(line);
         writer.newLine();
      }
      reader.close();
      writer.close();
   }
}