java编写并发安全的用户管理系统

  • mingtian66

    2025-05-27 10:15:11
  • Java
  • 原创

以下是使用Java实现的并发安全用户管理系统，包含用户CRUD操作、线程安全控制和数据持久化功能：


public class User {

    private final String id;

    private String name;

    private String email;

    

    public User(String id, String name, String email) {

        this.id = id;

        this.name = name;

        this.email = email;

    }

    // getters and setters...

}

import java.util.concurrent.*;

import java.util.*;


public class UserManager {

    private final ConcurrentMap users = new ConcurrentHashMap<>();

    private final ReadWriteLock lock = new ReentrantReadWriteLock();

    

    public boolean addUser(User user) {

        lock.writeLock().lock();

        try {

            return users.putIfAbsent(user.getId(), user) == null;

        } finally {

            lock.writeLock().unlock();

        }

    }

    

    public User getUser(String id) {

        lock.readLock().lock();

        try {

            return users.get(id);

        } finally {

            lock.readLock().unlock();

        }

    }

    

    public List getAllUsers() {

        lock.readLock().lock();

        try {

            return new ArrayList<>(users.values());

        } finally {

            lock.readLock().unlock();

        }

    }

}

import java.io.*;


public class UserPersistence {

    public static void saveToFile(UserManager manager, String filename) {

        try (ObjectOutputStream oos = new ObjectOutputStream(

            new FileOutputStream(filename))) {

            oos.writeObject(new ArrayList<>(manager.getAllUsers()));

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    

    public static void loadFromFile(UserManager manager, String filename) {

        try (ObjectInputStream ois = new ObjectInputStream(

            new FileInputStream(filename))) {

            List users = (List) ois.readObject();

            users.forEach(manager::addUser);

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}

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 class Main {

    public static void main(String[] args) {

        UserManager manager = new UserManager();

        manager.addUser(new User("1", "Alice", "alice@example.com"));

        

        // 多线程测试

        ExecutorService executor = Executors.newFixedThreadPool(5);

        for (int i = 0; i < 10; i++) {

            final int id = i;

            executor.execute(() -> {

                manager.addUser(new User(

                    String.valueOf(id), 

                    "User"+id, 

                    "user"+id+"@test.com"

                ));

            });

        }

        executor.shutdown();

    }

}


该系统通过ConcurrentHashMap和ReadWriteLock保证线程安全，包含用户数据的内存管理和文件持久化功能。UserManager类提供原子操作方法，UserPersistence处理数据存储。

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