Question

祝大家好日子。

我正在为我的网吧创建一个java的网络程序。我的服务器代码是

    import java.io.*;
    import java.net.Socket;
    import java.net.ServerSocket;

public class Server
{
    private String name;
    private int id;

    private Socket socket = null;
    private ServerSocket serversocket = null;
    private ObjectInputStream ois = null;

    public Server()
    {
        new Thread(receive).start();

        while(true)
        {
            try
            {
                serversocket = new ServerSocket(4445);
                socket = serversocket.accept();
                System.out.println("Connected..");
            }
            catch(IOException e)
            {
                e.printStackTrace();
            }
        }

    }

    Runnable send = new Runnable(){
        public void run ()
        {

        }

    };

    Runnable receive = new Runnable(){
        public void run ()
        {
            while(true)
            {
                try
                {
                    ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
                    User user = (User) ois.readObject();
                    System.out.println(user);
                }
                catch(IOException e)
                {
                    e.printStackTrace();
                }
                catch(ClassNotFoundException e)
                {
                    e.printStackTrace();
                }
            }
        }
    };

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

我的问题是我无法在Runnable接口代码中访问我的实例变量。

例如＆＃34; socket＆＃34;实例。在此代码中无法访问

Runnable receive = new Runnable(){
        public void run ()
        {
            while(true)
            {
                try
                {
                    ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
                    User user = (User) ois.readObject();
                    System.out.println(user);
                }
                catch(IOException e)
                {
                    e.printStackTrace();
                }
                catch(ClassNotFoundException e)
                {
                    e.printStackTrace();
                }
            }
        }
    };

这方面的最佳方法是什么？为什么在该代码中无法访问？

Answer 1

为什么呢？这是答案：Why are only final variables accessible in anonymous class?

如果您需要从服务器访问套接字，则应在Server类上声明最终变量为Socket socket。

Answer 2

试试这个

public Server() {
    try {
        serversocket = new ServerSocket(4445);
        while (true) {
            socket = serversocket.accept();
            new Thread(receive).start();
            System.out.println("Connected..");
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Answer 3

如果我没记错，你需要让套接字字段最终。原因让我现在逃脱了。

java中的实例变量范围

3 个答案: