[论坛提问] Tcp传输小练习，我的程序复制的MP3文件少了4KB却还是可以

Tcp传输小练习，我的程序复制的MP3文件少了4KB却还是可以打开，这是为什么？

import java.io.*;
import java.net.*;
class ClientDemo4
{
public static void main(String[] args) throws Exception
{
Socket s=new Socket("192.168.1.100",10001);
BufferedInputStream bufIs=new BufferedInputStream(new FileInputStream("1.mp3"));
BufferedOutputStream bufOut=new BufferedOutputStream(s.getOutputStream());
byte[] buf=new byte[1024];
int len=0;
while ((len=bufIs.read(buf))!=-1)
{
bufOut.write(buf,0,len);
}
s.shutdownOutput();//关闭客户端输出流，相当于给一个-1结束标记。
BufferedReader bufIn=new BufferedReader(new InputStreamReader(s.getInputStream()));
System.out.println(bufIn.readLine());
bufIs.close();
s.close();
}
}
class ServerDemo4
{
public static void main(String[] args) throws Exception
{
ServerSocket ss=new ServerSocket(10001);
Socket s=ss.accept();
String ip=s.getInetAddress().getHostAddress();
System.out.println(ip+"....connection");
BufferedInputStream bufIs=new BufferedInputStream(s.getInputStream());
BufferedOutputStream bufw=new BufferedOutputStream(new FileOutputStream("2.mp3"));
byte[] buf=new byte[1024];
int len=0;
while ((len=bufIs.read(buf))!=-1)
{
bufw.write(buf,0,len);
bufw.flush();
}
PrintWriter pw=new PrintWriter(s.getOutputStream(),true);
pw.println("上传成功");
bufw.close();
s.close();
ss.close();
}
}

复制代码

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