下载文件

import java.net.*;

import java.io.*;

public class URLConnectionDemo{

    public static void main(String[] args)throws Exception{

        URL url = new URL("http://www.scp.edu.cn/pantoschoolzz/BG/Bord/Message/DownloadMessageAttachment.aspx?ID=215");

        URLConnection uc = url.openConnection();

        String fileName = uc.getHeaderField(6);

        fileName = URLDecoder.decode(fileName.substring(fileName.indexOf("filename=")+9),"UTF-8");

        System.out.println("文件名为："+fileName);

        System.out.println("文件大小："+(uc.getContentLength()/1024)+"KB");

        String path = "D:"+File.separator+fileName;

        FileOutputStream os = new FileOutputStream(path);

        InputStream is = uc.getInputStream();

        byte[] b = new byte[1024];

        int len = 0;

        while((len=is.read(b))!=-1){

            os.write(b,0,len);

        }

        os.close();

        is.close();

        System.out.println("下载成功,文件保存在："+path);

    }

}