如何使 Java 服务器从变量而不是控制台输入中读取？答案

【问题标题】：How to make Java server read from variable instead of console input?如何使 Java 服务器从变量而不是控制台输入中读取？
【发布时间】：2020-01-01 22:38:11
【问题描述】：

我正在创建一个简单的套接字程序，它可以读取用户输入并将其存储在其变量中。它还允许向服务器发送消息。

客户端输入他们的详细信息（名称等），然后输入连接详细信息。我已经创建了发送这些变量的方法，但它们不能正常工作。

下面的预期结果：将客户端类中的playerName 存储到服务器类中的playerName。实际结果：连接后的第一个输入存储到服务器的playerName变量中

//服务器客户端类

public static String playerName = "Client";


public static void playerDetails() {
        Scanner playerInfo = new Scanner(System.in);

        System.out.println("Welcome! Please Enter Your Player Name:");
        playerName = playerInfo.nextLine();
}

public void sendNameToServer(String pName) throws IOException {
        if (this.clientSocket == null || this.output == null)
            throw new SocketException("Socket does not exist");
        this.output.writeObject(playerName);
    }

    public void sendMessageToServer(String msg) throws IOException {
        if (this.clientSocket == null || this.output == null)
            throw new SocketException("socket does not exist");

        this.output.writeObject(msg);
    }


public void runClient() {
        try {
            BufferedReader fromConsole = new BufferedReader(new InputStreamReader(System.in));
            String message = null;

            while (true) {
                message = fromConsole.readLine();
                handleUserInput(message);
                if(message.equals("over"))

                    break;
            }



// server client Manager Class

try {
                this.out = new ObjectOutputStream(this.clientSocket.getOutputStream());
                this.in = new ObjectInputStream(this.clientSocket.getInputStream());            
            }



            String pName = null;
            String msg = "";

            //Name

            pName = (String)this.in.readObject();
            this.server.sendNameToServer(pName, this);



            msg = (String)this.in.readObject();
            this.server.handleMessagesFromClient(msg, this);


//Abstract Methods
public abstract class ServerAbstractComponents {
    public abstract void handleMessagesFromClient(String msg, ServerClientManager clientmgr);
    public abstract void sendMessageToClient(String msg, ServerClientManager clientmgr);
    public abstract void sendNameToServer(String pName, ServerClientManager clientmgr);

//Server Class
public  String playerName;
        public synchronized void sendNameToServer(String pName, ServerClientManager client) {
            playerName = pName;
            }


public synchronized void handleMessagesFromClient(String msg, ServerClientManager client) {

            // format the client message before displaying in server's terminal output. 
             String formattedMessage = String.format("[client %d] : %s", client.getClientID(), msg); 

                if(msg.equals(new String("test"))) {
                    System.out.println("your name is:" + playerName);
                } else 

            display(formattedMessage);
}

【问题讨论】：

您发布了太多代码，无法通过 - 请参阅 MCVE 并相应地编辑您的问题。然而，我的猜测是问题是playerName 是static。尝试从playerName（方法和变量）中删除static 关键字。
您好，我已尝试删除 static 关键字，但在实例化类时遇到问题，我已尝试创建类的实例以使程序运行。 ServerClient myClient = new ServerClient(); myClient.playerDetails(); 但是我现在无法引用 main 中的非静态方法
我没有看到任何使用的 ServerSocket 或 Socket 实例。

标签： java sockets server

【解决方案1】：

这是我的做法。

//Writes player Name as an object to the output Stream
        System.out.println("Welcome, Enter your name :");
        try {
            Scanner playerInfo = new Scanner(System.in);
            playerName2 = playerInfo.nextLine();
            this.output.writeObject(playerName2);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } System.out.println("Welcome to The Game! " + playerName2);

//ServerClientManager类

            //Name2
            try {
            pName2 = (String)this.in.readObject();
        } catch (ClassNotFoundException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        } catch (IOException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        }
        this.server.sendNameToServer2(pName2, this);

//抽象类

public abstract void sendNameToServer(String pName2, ServerClientManager clientmgr);

//服务器类

public String playerName2;
        public synchronized void sendNameToServer2(String pName2, ServerClientManager client) {
            client.playerName2 = pName2;
        }

【讨论】：