Question

这是服务器

public class SocketMsg {

    public static void main(String[] args) throws IOException{
    ServerSocket ss = new ServerSocket("number goes here");


    System.out.println("Server Ready");
    ss.accept();


    }
    }

客户端：

public class SocketMesg {



public static void main(String[] args) throws IOException{
  Socket socket = null;
    OutputStreamWriter osw;
    String str = "Hello World";
    try {
        socket = new Socket("localhost", "number goes here");
        osw =new OutputStreamWriter(socket.getOutputStream());
        osw.write(str, 0, str.length());
    } catch (IOException e) {
        System.err.print(e);
    } 
    finally {
        socket.close();
    }

}

就个人而言，代码有效，但字符串没有发送到其他主机，我给了他们相同的号码，但它没有用。客户端将其发送回DOS窗口中的服务器。我犯了错误吗？我做错了什么？

Answer 1

您的服务器端至少需要以下内容。

Socket clientSocket = serverSocket.accept();
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));


String inputLine;
while ((inputLine = in.readLine()) != null) {
    // process inputLine;
}

Answer 2

您需要刷新outputstream以向套接字提交写入缓冲区。如果写字符串也要小心charset。此示例明确使用UTF-8到＆＃34;低级＆＃34;字节数组缓冲区。我认为你正在练习你的第一个套接字编程，所以我保持这个非常简单。

<强> Server.java

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

public class Server {

    public static void main(String[] args) throws Exception {
        ServerSocket ss = new ServerSocket(1122);
        System.out.println("Server Ready");
        while(true) {
            Socket socket = ss.accept();
            InputStream is = socket.getInputStream();
            // client must send 1-10 bytes, no more in single command
            byte[] buf = new byte[10]; 
            int read = is.read(buf, 0, buf.length);
            String cmd = new String(buf, 0, read, "UTF-8");
            System.out.println(cmd);
            socket.close(); // we are done, this example reads input and then closes socket
        }
    }

}

<强> Client.java

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

public class Client {

    public static void main(String[] args) throws Exception {
        Socket socket = null;
        // send max of 10 bytes to simplify this example
        String str = "ABCDEFGHIJ"; 
        try {
            socket = new Socket("localhost", 1122);
            OutputStream os = socket.getOutputStream();
            byte[] buf = str.getBytes("UTF-8");
            os.write(buf, 0, buf.length);
            os.flush();
        } catch (IOException ex) {
            System.err.print(ex);
        } finally {
            socket.close();
        }
    }

}

通过套接字发送字符串

2 个答案: