public void run() { while(true) { //这里该线程就可以接受客户端的信息 try { ObjectInputStream ois=new ObjectInputStream(s.getInputStream()); Message m=(Message)ois.readObject(); System.out.println(m.getSender()+"给 "+m.getGetter()+"发送: "+m.getCon());//判断接受到客户端的信息 //拿到发送者与服务器的socket,此时就需要hashmap; SerConClientThread sc=ManageClientThread.getClientThread(m.getGetter()); ObjectOutputStream oos=new ObjectOutputStream(sc.s.getOutputStream()); //接受人的通信线程; oos.writeObject(m); } catch(Exception e) { e.printStackTrace(); } } }

这段代码是一个多线程的服务器端程序，用于接收客户端发送的消息，并将消息发送给指定的接收者。

程序的主要逻辑如下：

1. 服务器端通过 socket.accept() 方法监听客户端的连接请求，每当有新的客户端连接时，就会创建一个新的线程来处理该客户端的请求。

2. 在线程中，通过 ObjectInputStream 读取客户端发送的消息，并解析出消息的发送者、接收者以及消息内容。

3. 利用 ManageClientThread 类中维护的 HashMap，根据接收者的用户名获取对应的 SerConClientThread 对象，再通过其 socket 获取 ObjectOutputStream 对象，将消息发送给接收者。

4. 如果出现异常，则打印堆栈信息。

需要注意的是，这段代码还缺少了对客户端下线的处理。如果客户端下线，则需要将其对应的 SerConClientThread 对象从 HashMap 中删除。

相关问题

上述退出客户端和服务端的完整代码

以下是一个简单的客户端和服务端的实现，包含退出功能的代码示例：

客户端代码：

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Objects;
import java.util.Scanner;

public class Client {
    private static Socket socket;
    private static ObjectOutputStream oos;
    private static ObjectInputStream ois;

    public static void main(String[] args) {
        try {
            // 连接服务端
            socket = new Socket("localhost", 8888);
            // 获取输出流和输入流
            oos = new ObjectOutputStream(socket.getOutputStream());
            ois = new ObjectInputStream(socket.getInputStream());

            // 启动读线程
            new Thread(new ReadThread()).start();

            // 向服务端发送消息
            Scanner scanner = new Scanner(System.in);
            while (true) {
                String msg = scanner.nextLine();
                oos.writeObject(msg);
                oos.flush();
                if("exit".equals(msg)) {
                    // 关闭网络连接和输入输出流
                    if(Objects.nonNull(socket)){
                        socket.close();
                    }
                    if(Objects.nonNull(oos)){
                        oos.close();
                    }
                    if(Objects.nonNull(ois)){
                        ois.close();
                    }
                    // 退出客户端
                    System.exit(0);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static class ReadThread implements Runnable {
        @Override
        public void run() {
            try {
                while (true) {
                    String msg = (String) ois.readObject();
                    System.out.println("服务端说：" + msg);
                }
            } catch (IOException | ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
    }
}

服务端代码：

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Objects;

public class Server {
    private static ServerSocket serverSocket;
    private static Socket socket;
    private static ObjectOutputStream oos;
    private static ObjectInputStream ois;

    public static void main(String[] args) {
        try {
            // 创建ServerSocket并绑定端口
            serverSocket = new ServerSocket(8888);
            System.out.println("服务端已启动，等待客户端连接...");

            // 等待客户端连接
            socket = serverSocket.accept();
            System.out.println("客户端已连接，地址：" + socket.getInetAddress());

            // 获取输出流和输入流
            oos = new ObjectOutputStream(socket.getOutputStream());
            ois = new ObjectInputStream(socket.getInputStream());

            // 启动读线程
            new Thread(new ReadThread()).start();

            // 向客户端发送消息
            while (true) {
                String msg = "欢迎使用聊天室！";
                oos.writeObject(msg);
                oos.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static class ReadThread implements Runnable {
        @Override
        public void run() {
            try {
                while (true) {
                    String msg = (String) ois.readObject();
                    System.out.println("客户端说：" + msg);
                    if("exit".equals(msg)) {
                        // 关闭网络连接和输入输出流
                        if(Objects.nonNull(socket)){
                            socket.close();
                        }
                        if(Objects.nonNull(oos)){
                            oos.close();
                        }
                        if(Objects.nonNull(ois)){
                            ois.close();
                        }
                        // 退出服务端
                        System.exit(0);
                    }
                }
            } catch (IOException | ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
    }
}

在上述代码中，客户端和服务端都可以通过发送exit消息来退出应用程序。当收到exit消息时，程序会关闭网络连接和输入输出流，并退出应用程序。

用Java代码多线程，集合，网络通信，GUI,IO,写一个租车App

好的，我可以帮你提供一个简单的租车App的Java代码示例，包括多线程、集合、网络通信、GUI、IO等方面。

首先，我们需要定义一个车辆类Car，包含车辆的基本信息：

public class Car {
    private String brand; // 品牌
    private String model; // 型号
    private double price; // 租金
    private boolean isRented; // 是否已被租走

    public Car(String brand, String model, double price) {
        this.brand = brand;
        this.model = model;
        this.price = price;
        this.isRented = false;
    }

    // getter和setter方法省略
}

接下来，我们定义一个租车公司类CarRentalCompany，用来管理车辆的租赁：

import java.util.ArrayList;
import java.util.List;

public class CarRentalCompany {
    private List<Car> cars; // 所有车辆列表

    public CarRentalCompany() {
        // 初始化车辆列表
        cars = new ArrayList<>();
        cars.add(new Car("Toyota", "Camry", 300));
        cars.add(new Car("Honda", "Accord", 350));
        cars.add(new Car("Nissan", "Altima", 320));
    }

    // 获取所有未被租走的车辆
    public List<Car> getAvailableCars() {
        List<Car> availableCars = new ArrayList<>();
        for (Car car : cars) {
            if (!car.isRented()) {
                availableCars.add(car);
            }
        }
        return availableCars;
    }

    // 租车
    public void rentCar(Car car) {
        car.setRented(true);
    }

    // 还车
    public void returnCar(Car car) {
        car.setRented(false);
    }
}

我们还需要一个客户类Customer，用来租车和还车：

public class Customer {
    private String name; // 姓名
    private CarRentalCompany company; // 所属租车公司

    public Customer(String name, CarRentalCompany company) {
        this.name = name;
        this.company = company;
    }

    // 租车
    public void rentCar(Car car) {
        company.rentCar(car);
        System.out.println(name + "租了一辆" + car.getBrand() + " " + car.getModel() + "，租金为" + car.getPrice() + "元/天。");
    }

    // 还车
    public void returnCar(Car car) {
        company.returnCar(car);
        System.out.println(name + "还了一辆" + car.getBrand() + " " + car.getModel() + "。");
    }
}

接下来，我们可以编写GUI界面，展示所有可租赁的车辆和已租赁的车辆，并提供租车和还车按钮。这里使用Swing库来实现GUI界面：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.List;

public class CarRentalApp extends JFrame implements ActionListener {
    private CarRentalCompany company; // 租车公司
    private List<Car> availableCars; // 所有未被租走的车辆
    private List<Car> rentedCars; // 所有已被租走的车辆
    private JList<Car> availableCarList; // 可租赁车辆列表
    private JList<Car> rentedCarList; // 已租赁车辆列表
    private JButton rentButton; // 租车按钮
    private JButton returnButton; // 还车按钮

    public CarRentalApp() {
        company = new CarRentalCompany();

        // 初始化GUI界面
        setTitle("租车App");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(600, 400));
        setLayout(new BorderLayout());

        // 获取所有未被租走的车辆
        availableCars = company.getAvailableCars();
        // 获取所有已被租走的车辆
        rentedCars = new ArrayList<>();
        for (Car car : company.getCars()) {
            if (car.isRented()) {
                rentedCars.add(car);
            }
        }

        // 可租赁车辆列表
        availableCarList = new JList<>(availableCars.toArray(new Car[0]));
        availableCarList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane availableScrollPane = new JScrollPane(availableCarList);
        availableScrollPane.setPreferredSize(new Dimension(250, 300));
        add(availableScrollPane, BorderLayout.WEST);

        // 已租赁车辆列表
        rentedCarList = new JList<>(rentedCars.toArray(new Car[0]));
        rentedCarList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane rentedScrollPane = new JScrollPane(rentedCarList);
        rentedScrollPane.setPreferredSize(new Dimension(250, 300));
        add(rentedScrollPane, BorderLayout.EAST);

        // 租车按钮
        rentButton = new JButton("租车");
        rentButton.addActionListener(this);
        add(rentButton, BorderLayout.NORTH);

        // 还车按钮
        returnButton = new JButton("还车");
        returnButton.addActionListener(this);
        add(returnButton, BorderLayout.SOUTH);

        pack();
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == rentButton) {
            // 租车
            Car selectedCar = availableCarList.getSelectedValue();
            if (selectedCar != null) {
                Customer customer = new Customer("张三", company);
                customer.rentCar(selectedCar);
                availableCars.remove(selectedCar);
                rentedCars.add(selectedCar);
                availableCarList.setListData(availableCars.toArray(new Car[0]));
                rentedCarList.setListData(rentedCars.toArray(new Car[0]));
            }
        } else if (e.getSource() == returnButton) {
            // 还车
            Car selectedCar = rentedCarList.getSelectedValue();
            if (selectedCar != null) {
                Customer customer = new Customer("张三", company);
                customer.returnCar(selectedCar);
                rentedCars.remove(selectedCar);
                availableCars.add(selectedCar);
                availableCarList.setListData(availableCars.toArray(new Car[0]));
                rentedCarList.setListData(rentedCars.toArray(new Car[0]));
            }
        }
    }

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

最后，我们需要实现网络通信和IO操作，将租车信息写入文件和从文件中读取租车记录。这里我们采用Socket和ObjectOutputStream/ObjectInputStream来实现网络通信和对象的序列化：

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class CarRentalServer {
    private List<Car> cars; // 所有车辆列表
    private List<RentalRecord> rentalRecords; // 租车记录列表

    public CarRentalServer() {
        // 初始化车辆列表
        cars = new ArrayList<>();
        cars.add(new Car("Toyota", "Camry", 300));
        cars.add(new Car("Honda", "Accord", 350));
        cars.add(new Car("Nissan", "Altima", 320));

        // 初始化租车记录列表
        rentalRecords = new ArrayList<>();

        // 启动服务器
        try {
            ServerSocket serverSocket = new ServerSocket(8888);
            while (true) {
                Socket socket = serverSocket.accept();
                new ClientHandler(socket).start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private synchronized void rentCar(String customerName, Car car) {
        car.setRented(true);
        rentalRecords.add(new RentalRecord(customerName, car, true));
    }

    private synchronized void returnCar(String customerName, Car car) {
        car.setRented(false);
        rentalRecords.add(new RentalRecord(customerName, car, false));
    }

    private void saveRentalRecords() {
        try {
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("rental_records.dat"));
            oos.writeObject(rentalRecords);
            oos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void loadRentalRecords() {
        try {
            ObjectInputStream ois = new ObjectInputStream(new FileInputStream("rental_records.dat"));
            rentalRecords = (List<RentalRecord>) ois.readObject();
            ois.close();
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    private class ClientHandler extends Thread {
        private Socket socket;

        public ClientHandler(Socket socket) {
            this.socket = socket;
        }

        @Override
        public void run() {
            try {
                ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
                String command = (String) ois.readObject();
                if (command.equals("rent")) {
                    String customerName = (String) ois.readObject();
                    Car car = (Car) ois.readObject();
                    rentCar(customerName, car);
                } else if (command.equals("return")) {
                    String customerName = (String) ois.readObject();
                    Car car = (Car) ois.readObject();
                    returnCar(customerName, car);
                } else if (command.equals("load")) {
                    ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
                    oos.writeObject(cars);
                    oos.writeObject(rentalRecords);
                    oos.close();
                } else if (command.equals("save")) {
                    saveRentalRecords();
                }
                ois.close();
                socket.close();
            } catch (IOException | ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
    }

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

客户端代码如下：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.Socket;
import java.util.List;

public class CarRentalClient extends JFrame implements ActionListener {
    private List<Car> cars; // 所有车辆列表
    private List<RentalRecord> rentalRecords; // 租车记录列表
    private JList<Car> availableCarList; // 可租赁车辆列表
    private JList<RentalRecord> rentalRecordList; // 租车记录列表
    private JButton rentButton; // 租车按钮
    private JButton returnButton; // 还车按钮
    private JButton saveButton; // 保存按钮

    public CarRentalClient() {
        // 初始化GUI界面
        setTitle("租车App");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(800, 400));
        setLayout(new BorderLayout());

        // 可租赁车辆列表
        availableCarList = new JList<>();
        availableCarList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane availableScrollPane = new JScrollPane(availableCarList);
        availableScrollPane.setPreferredSize(new Dimension(250, 300));
        add(availableScrollPane, BorderLayout.WEST);

        // 租车记录列表
        rentalRecordList = new JList<>();
        rentalRecordList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        JScrollPane rentalScrollPane = new JScrollPane(rentalRecordList);
        rentalScrollPane.setPreferredSize(new Dimension(500, 300));
        add(rentalScrollPane, BorderLayout.EAST);

        // 租车按钮
        rentButton = new JButton("租车");
        rentButton.addActionListener(this);
        add(rentButton, BorderLayout.NORTH);

        // 还车按钮
        returnButton = new JButton("还车");
        returnButton.addActionListener(this);
        add(returnButton, BorderLayout.CENTER);

        // 保存按钮
        saveButton = new JButton("保存");
        saveButton.addActionListener(this);
        add(saveButton, BorderLayout.SOUTH);

        pack();
        setVisible(true);

        // 从服务器加载数据
        loadDataFromServer();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == rentButton) {
            // 租车
            Car selectedCar = availableCarList.getSelectedValue();
            if (selectedCar != null) {
                try {
                    Socket socket = new Socket("localhost", 8888);
                    ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
                    oos.writeObject("rent");
                    oos.writeObject("张三");
                    oos.writeObject(selectedCar);
                    oos.close();
                    socket.close();
                    loadDataFromServer();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        } else if (e.getSource() == returnButton) {
            // 还车
            RentalRecord selectedRecord = rentalRecordList.getSelectedValue();
            if (selectedRecord != null && selectedRecord.isRent()) {
                try {
                    Socket socket = new Socket("localhost", 8888);
                    ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
                    oos.writeObject("return");
                    oos.writeObject("张三");
                    oos.writeObject(selectedRecord.getCar());
                    oos.close();
                    socket.close();
                    loadDataFromServer();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        } else if (e.getSource() == saveButton) {
            // 保存租车记录
            try {
                Socket socket = new Socket("localhost", 8888);
                ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
                oos.writeObject("save");
                oos.close();
                socket.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    private void loadDataFromServer() {
        try {
            Socket socket = new Socket("localhost", 8888);
            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            oos.writeObject("load");
            oos.close();

            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            cars = (List<Car>) ois.readObject();
            rentalRecords = (List<RentalRecord>) ois.readObject();
            ois.close();
            socket.close();

            // 更新GUI界面
            availableCarList.setListData(cars.toArray(new Car[0]));
            rentalRecordList.setListData(rentalRecords.toArray(new RentalRecord[0]));
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

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

这样，我们就完成了一个简单的租车App，并实现了多线程、集合、网络通信、GUI、IO等方面的应用。