TCP上传数据时少了4K为什么？见图！ - 黑马程序员技术交流社区

public class UpLoadServer
{
public static void main(String[] args) throws Exception
{
//创建服务器端套接字监听指定端口
ServerSocket server = new ServerSocket(11111);
//获取连接的客户端套接字，并显示连接成功
Socket client = server.accept();
String ip = client.getInetAddress().getHostAddress();
System.out.println(ip+" 连接成功！");
//获取客户端套接字输入流，接收客户端上传的数据
BufferedInputStream bufIn =
new BufferedInputStream(client.getInputStream());
//定义缓冲区输出流，向服务器端写数据
BufferedOutputStream bufOut =
new BufferedOutputStream(new FileOutputStream("d:\\heima_server.jpg"));
//将客户端上传的数据存储在服务器端
byte[] buf = new byte[1024];
int len = 0;
while ((len = bufIn.read(buf))!=-1)
{
bufOut.write(buf,0,len);
}
//上传完成后，向客户端反馈传输结果
OutputStream out = client.getOutputStream();
out.write("上传成功！".getBytes());
//关闭资源
bufOut.close();
client.close();
server.close();
}
}
public class UpLoadClient {
public static void main(String[] args) throws Exception
{
//在建立客户端套接字连接到指定服务器端
Socket client = new Socket("192.168.100.4",11111);
//用字节缓冲区对象读取本地的文件
BufferedInputStream bufIn =
new BufferedInputStream(new FileInputStream("D:\\heima.jpg"));
//获取客户端套接字的输出流，向服务器端上传数据
BufferedOutputStream bufOut =
new BufferedOutputStream(client.getOutputStream());
//将本地文件上传到服务器端
byte[] buf = new byte[1024];
int len = 0;
while ((len = bufIn.read(buf))!=-1)
{
bufOut.write(buf,0,len);
}
//文件上传完毕，关闭输出流
client.shutdownOutput();
//获取客户端套接字输入流，接收服务器端反馈信息
InputStream in = client.getInputStream();
byte[] result = new byte[1024];
int num = in.read(result);
System.out.println(new String(result,0,num));
//关闭资源
bufIn.close();
client.close();
}
}

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