流的形式ftp下载

FtpURLConnection ftpc = null;

PrintWriter out = null;

try{

     URL url = new URL(path);

//path 格式RL myURL=new URL(ftp://hgc08158:[email protected]/chengji.xls);
ftp://用户名：密码@ip[:端口后][/文件所在目录]/文件
     ftpc = (FtpURLConnection) url.openConnection();

     // 定义输入流
     InputStream instream = ftpc.getInputStream();

     // 定义一个大小为1024的字节数组
     byte[] buf = new byte[1024];

     // 从输入流中读出字节到定义的字节数组
     int len = instream.read(buf, 0, 1024);

     // 循环读入字节，然后写到文件输出流中
     while (len != -1) {
      writer.write(buf, 0, len);
      len = instream.read(buf, 0, 1024);
     }
    } catch (Exception e) {
     log.warn("下载资源出错:\n" + e.toString());
     throw e;
    } finally {
     if (ftpc != null)
      ftpc.close();
     if (out != null) {
      out.flush();
      out.close();
     }
     if (writer != null) {
      writer.flush();
      writer.close();
     }
    }