Java下载url文件方法

 

import java.net.*;
import java.io.*;
public class Download{
 private URL u = null;
 private String file_name ;
 BufferedInputStream bis= null;
 FileOutputStream fos = null;

 public Download(){}
 
 public Download(String p){
  try{
   u = new URL(p);
  }
  catch(MalformedURLException mue){
  }
  getName(p);
 }

 private void getName(String path){
  this.file_name = "./"+path.substring(path.lastIndexOf('/'));
  if(this.file_name.length() == 0){
   System.out.println("no file name!");
   System.exit(0);
  }

 }

 public void down(){
  try{
   bis = new BufferedInputStream(u.openStream());
   fos = new FileOutputStream(this.file_name);
   byte [] content = new byte [1000];
   int size = 0;
   while((size = bis.read(content)) != -1){
    fos.write(content,0,size);

   }

  }catch(FileNotFoundException ffe){
  }catch(IOException ioe){
  }finally{
   try{
    if(bis != null){
     bis.close();
    }
    if(fos != null){
     fos.close();
    }
   }catch(Exception e){}
  }
 }

}

 

 

public class Test{
 public static void main(String [] args){
  Download d = new Download("http://www.google.cn/intl/zh-CN/images/logo_cn.gif");
  d.down();
 }
}
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