客户端往服务端发送图片数据丢失

客户端往服务端发送图片，可以显示有.JPG，但是是0kb

public class Demo2 {

@Test
public void client() throws IOException
{
    Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),8898);
    OutputStream outputStream = socket.getOutputStream();
    BufferedInputStream bis  =
            new BufferedInputStream(new FileInputStream(new File("F:\\exer\\01.JPG")));

    byte[] buf = new byte[1024];
    int len;
    while((len = bis.read())!=-1)
    {
        outputStream.write(buf,0,len);
    }
    System.out.println("客户端发送成功");
    bis.close();
    outputStream.close();
    socket.close();

}

@Test
public void server() throws IOException {
    ServerSocket serverSocket = new ServerSocket(8898);
    Socket accept = serverSocket.accept();
    InputStream inputStream = accept.getInputStream();

    BufferedOutputStream bos =
            new BufferedOutputStream(new FileOutputStream(new File("F:\\exer\\TCP03.JPG")));
    byte[] buf = new byte[1024];
    int len;
    while((len = inputStream.read())!=-1)
    {
        bos.write(buf,0,len);
    }
    System.out.println("服务端接受成功");
    bos.close();
    inputStream.close();
    accept.close();
    serverSocket.close();
}

}
客户端运行结果：
客户端发送成功

Process finished with exit code 0

服务端运行结果：
服务端接受成功

Process finished with exit code 0

while((len = bis.read())!=-1)
    {
        outputStream.write(buf,0,len);
    }
改为
while((len = bis.read(buf,0,buf.length))!=-1)
    {
        outputStream.write(buf,0,len);
    }
    outputStream.flush();
    outputStream.close();

while((len = inputStream.read())!=-1)
    {
        bos.write(buf,0,len);
    }
改为
while((len = inputStream.read(buf,0,buf.length))!=-1)
    {
        bos.write(buf,0,len);
    }