救命啊！java Tcp上传文件竟然丢失部分数据！！！

[山外客]

如题！我上传的是个MP3文件，丢了16K数据

//客户端
import java.io.*;
import java.net.*;
/*
 * 需求：客户端并发上传图片
 */
public class Tcp练习4 
{
	public static void main(String [] args)throws Exception
	{
		if(args.length!=1)
		{
			System.out.println("输入信息长度必须唯一");
			return;
		}
		String filename=args[0];
		
		File file=new File(filename);
		
		if(!(file.exists()&&file.isFile()))
		{
			System.out.println("文件不存在或不是文件");
			return;
		}
		
		Socket soc=new Socket(InetAddress.getLocalHost(),9000);
		

		
		FileInputStream fr=new FileInputStream(file);
		
		OutputStream out=soc.getOutputStream();
		InputStream in=soc.getInputStream();
		
		System.out.println(filename);

		//将文件名发给客户端
		PrintStream pp=new PrintStream(out,true);
		pp.println(filename);
		
		
		int len;
		byte [] buf=new byte[1024];
		while((len=fr.read(buf))!=-1)
		{
			out.write(buf,0,len);
		}
		soc.shutdownOutput();
		
		len=in.read(buf);
		System.out.println(new String(buf,0,len));
		
		soc.close();
		in.close();
		out.close();
		fr.close();
		
	}
}

//服务端
//package a;
import java.io.*;
import java.net.*;
/*
 * 客户端的并发上传文件的原理。（凡是服务器都这样）
 * 		获得一个连接启动一个线程（run方法）
 */
class FileThread implements Runnable
{
	private Socket soc;
	FileThread(Socket soc)
	{
		this.soc=soc;
	}
	public void run()
	{
	
			
				try
				{
					String ip=soc.getInetAddress().getHostAddress();
					
					System.out.println(ip+"     connected");
					
					InputStream in=soc.getInputStream();
					BufferedReader br=new BufferedReader(new InputStreamReader(in));
					String path=br.readLine();
					//System.out.println(name);
					//String [] ss=name.split("/.");
					String name=path.substring(0, path.lastIndexOf('.'));
					String format=path.substring(path.lastIndexOf('.'));
					
				
					
					int count=1;
					byte [] buf=new byte[1024];
					int len;
					//stem.out.println(ss.length);
					File file=new File(name+"("+count+")"+format);
					while(file.exists())
					{
						count++;
						file=new File(name+"("+count+")"+format);
					}

					
					FileOutputStream fos=new FileOutputStream(file);//////////////////////////////////
					OutputStream out=soc.getOutputStream();


				
				
				while((len=in.read(buf))!=-1)
				{
					fos.write(buf, 0, len);
					
				}
		
				out.write("上传成功".getBytes());
				in.close();
				out.close();
				fos.close();
		}
		catch(Exception e)
		{
			e.printStackTrace();
			throw new RuntimeException("服务端出错");
		}
	}
}
public class 练习Server4 
{
	public static void main(String [] ars)throws Exception
	{
		ServerSocket sersoc=new ServerSocket(9000);
		while(true)
		{
			Socket soc=sersoc.accept();
			new Thread(new FileThread(soc)).start();
		}
		
	}
}