[置顶] Java TCP套接字编程

客户机TCPClient.java：

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

class TCP Client { 
    public static void main(String argv[ ]) throws Exception 
    { 
        String sentence; 
        String modifiedSentence; 

        BufferedReader inFromUser = 
            new BufferedReader(new InputStreamReader(System.in)); 

        Socket ClientSocket = new Socket("hostname", 6789); 

        DataOutputStream outToServer = 
            new DataOutputStream(ClientSocket.getOutputStream()); 

        BufferedReader inFromServer = 
            new BufferedReader(newInputStreamReader(ClientSocket.getInputStream())); 

        sentence = inFromUser.readLine(); 

        outToServer.writeBytes(sentence + '\n'); 

        modifiedSentence = inFromServer.readLine(); 

        System.out.println("FROM Server: " + modifiedSentence); 

        ClientSocket.close();            
    } 
} 

服务器TCPServer.java：

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

class TCP Server { 

  public static void main(String argv[]) throws Exception 
    { 
      String ClientSentence; 
      String capitalizedSentence; 

      ServerSocket welcomeSocket = new ServerSocket(6789); 
  
      while(true) { 
           Socket connectionSocket = welcomeSocket.accept(); 

           BufferedReader inFromClient =  
                new BufferedReader(new 
                InputStreamReader(connectionSocket.getInputStream()));            

           DataOutputStream  outToClient = 
                new DataOutputStream(connectionSocket.getOutputStream()); 

           ClientSentence = inFromClient.readLine(); 

           capitalizedSentence = ClientSentence.toUpperCase() + '\n'; 

           outToClient.writeBytes(capitalizedSentence); 
        } 
    } 
}