java - 是否可以在服务器上解码从客户端作为字节数组发送的字节？

Question

我只是想测试通过 TCP 套接字连接发送字节，我知道这并不是真正的目的，但我只是想弄清楚这是否可能

我正在尝试做什么:

• 从客户端上的字符串获取字节

• 将其作为字节发送到服务器

• 获取服务器上的字节并将其解码回原始字符串

客户:

package ByteClientServer;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.*;

public class Client {


    String hostAddress = "localhost";
    int port = 1010;


    public Client()
    {
        try {

            Socket socket = new Socket(hostAddress, port);

            String test = "hello"; //dycrypt bytes from this string on server side

            byte[] byteArray = test.getBytes();

            OutputStream out = socket.getOutputStream(); 
            DataOutputStream dos = new DataOutputStream(out);

            dos.write(byteArray);

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


    public static void main(String[] args)
    {
        new Client();
    }




}

服务器:

package ByteClientServer;

import java.io.*;
import java.net.*;


public class Server {

    public static void main(String[] args) 
    {
        try
        {                       
            ServerSocket server = new ServerSocket(1010);
            server.setSoTimeout(0);

            Socket connectionToClient = server.accept();
            InputStream is = connectionToClient.getInputStream();
            DataInputStream dis = new DataInputStream(is);


            byte[] data = dis.readUTF().getBytes();

            //dis.readFully(data, 0, data.length);

            String s = new String(data);

            System.out.println(s);


        }
        catch(IOException e)
        {
            e.printStackTrace();
            //System.err.println("Server was terminated.");
        }
    }
}

它不喜欢服务器上的这一行:

byte[] data = dis.readUTF().getBytes();

并抛出异常:

java.net.SocketException: Connection reset at java.net.SocketInputStream.read(Unknown Source) at java.net.SocketInputStream.read(Unknown Source) at java.io.DataInputStream.readFully(Unknown Source) at java.io.DataInputStream.readUTF(Unknown Source) at java.io.DataInputStream.readUTF(Unknown Source) at ByteClientServer.Server.main(Server.java:21)

Answer 1

如果您想使用readUTF，那么您需要使用writeUTF。如果您只想写入字节，那么您只需读取字节。