我的客户端服务器套接字有问题，我编写了代码，但是当我将信息（作为客户端）输入控制台时仍然没有任何反应

Question

so the problem im facing is when i run the client and put input i press enter nothing happens, it continues do scroll down, the client must enter information and then sends it to server, server receives information and adds it to linkedlist which is initialized in server class, after that the server preforms CalculateShippingPrice() and sends back output to client containing the price

class client

        //class CLient
        import java.io.*; .
        import java.net.*;
        class TCPClient {
        public static void main(String argv[]) throws Exception
        {
        String name;
        String ItemWeight;
        String PickUpLocation;
        String DistnationLocation;

        String modifiedSentence;// price to be returned to client
        BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
        Socket clientSocket = new Socket("localhost" , 3333);
        DataOutputStream outToServer = new DataOutputStream( clientSocket.getOutputStream());
        BufferedReader inFromServer = new BufferedReader(new 
        InputStreamReader(clientSocket.getInputStream()));

        System.out.println("please enter your name,itemWeight,pick up location,Distnation 
        location:");

        name = inFromUser.readLine(); //reads name
        ItemWeight = inFromUser.readLine(); //reads ItemWeight 
        PickUpLocation = inFromUser.readLine(); //reads PickUpLocation 
        DistnationLocation = inFromUser.readLine(); //reads DistnationLocation 


        outToServer.writeBytes(name + '\n'); //writes to server
        outToServer.writeBytes(ItemWeight + '\n');//writes to server
        outToServer.writeBytes(PickUpLocation + '\n');//writes to server
        outToServer.writeBytes(DistnationLocation + '\n');//writes to server


        modifiedSentence = inFromServer.readLine();//price to get from server
        System.out.println("FROM SERVER: " + modifiedSentence);//prints price
        clientSocket.close();
        }
        } 

class Server

        import java.io.*;

        import java.net.*; 
        class TCPServer {
        public static void main(String argv[]) throws Exception
        {
        List<customer> Shipping = new LinkedList<customer>();//initializes linked list from from 
        type customer that has all attributes  
        String name;
        String ItemWeight;
        String PickUpLocation;
        String DistnationLocation;
        String ItemID;
        String clientSentence;
        String capitalizedSentence;
        ServerSocket welcomeSocket = new ServerSocket (3333);

        while(true) {
        Socket connectionSocket = welcomeSocket.accept();
        BufferedReader inFromClient = new BufferedReader(new 
        InputStreamReader(connectionSocket.getInputStream()));
        DataOutputStream outToClient = new DataOutputStream( connectionSocket.getOutputStream());
        clientSentence = inFromClient.readLine(); //reads input from client
        name = clientSentence;//input from client
        ItemWeight = clientSentence;//input from client
        PickUpLocation = clientSentence;//input from client
        DistnationLocation = clientSentence;//input from client


        Shipping.insert(new customer(name, ItemWeight , PickUpLocation 
        ,DistnationLocation));//inserts info from client to linkedList in server

        capitalizedSentence = 
        "your shipping price is :" + Shipping.CalculateShippingPrice(Shipping);// calculates price
        outToClient.writeBytes(capitalizedSentence);//shows output to client 
        }
        }
        }    

Answer 1

There appears to be a few issues with your code that could be solved by using a debugger. One issue is that the client is gathering and sending four lines of input, while the server is only reading one line of input. I would guess that you probably want to read all four lines in the server (and remove clientSentence)?

        name = inFromClient.readLine();
        ItemWeight = inFromClient.readLine()
        PickUpLocation = inFromClient.readLine()
        DistnationLocation = inFromClient.readLine()

Also, the response MUST write a new line, or else the buffer won't be flushed. This could be resolved by adding a new line in the server:

        outToClient.writeBytes(capitalizedSentence + '\n');