为什么python套接字服务器一次只接受5840个字符？

Question

我创建了python套接字服务器。我在一个请求中接受了 65536 个字节。

我使用 BufferedWriter 从Java套接字客户端发送 10000 字符串到python套接字服务器。

Python套接字服务器仅接受 5840 个字符。

Java BufferedWriter中是否有任何大小限制？ python socket中有任何大小限制吗？

这里是我的python套接字服务器和Java套接字客户端程序代码。

Python套接字服务器

    import socket    

    serversocket = socket.socket(
        socket.AF_INET, socket.SOCK_STREAM) 

    host = socket.gethostname()
    print (host)

    port = 9999                                           

    serversocket.bind(("", port))                                  
    serversocket.listen(7)  
    print ("Server is listening client request....")

    while True:
        print ("It is true.....")
        clientsocket,addr = serversocket.accept()
        client_msg = clientsocket.recv(65536).decode()
        print (len(client_msg))
        print (client_msg)

Java套接字客户端

package test;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.Socket;

public class Tester {
    public static void main(String[] args) {

        String serverName = "192.168.1.99";
        int port = 9999;

        try {
            String st = "";
            for (int i = 0; i < 2000; i++) {
                st = st + "Hello";
            }

            System.out.println(st.length());

            Socket socket = new Socket(serverName, port);
            OutputStream outstream = socket.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(outstream);
            BufferedWriter bw = new BufferedWriter(osw);

            bw.write(st);
            bw.flush();
            bw.close();
            osw.close();
            outstream.close();
            socket.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}