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@ConfigurationProperties(ignoreUnknownFields = false, prefix = "ftp.client")
public class FtpClientProperties {
    // ftp地址
    private String host;
    // 端口号
    private Integer port = 21;
    // 登录用户
    private String username;
    // 登录密码
    private String password;
    // 被动模式
    private boolean passiveMode = false;
    // 编码
    private String encoding = "UTF-8";
    // 连接超时时间(秒)
    private Integer connectTimeout;
    // 缓冲大小
    private Integer bufferSize = 1024;
    // 传输文件类型
    private Integer transferFileType;
}

public interface PooledObjectFactory<T> {
	//创建对象
    PooledObject<T> makeObject();
	//激活对象
    void activateObject(PooledObject<T> obj);
    //钝化对象
    void passivateObject(PooledObject<T> obj);
    //验证对象
    boolean validateObject(PooledObject<T> obj);
    //销毁对象
    void destroyObject(PooledObject<T> obj);
}

public class FtpClientFactory extends BasePooledObjectFactory<FTPClient> {

    private FtpClientProperties config;

    public FtpClientFactory(FtpClientProperties config) {
        this.config = config;
    }

    /**
     * 创建FtpClient对象
     */
    @Override
    public FTPClient create() {
        FTPClient ftpClient = new FTPClient();
        ftpClient.setControlEncoding(config.getEncoding());
        ftpClient.setConnectTimeout(config.getConnectTimeout());
        try {

            ftpClient.connect(config.getHost(), config.getPort());
            int replyCode = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(replyCode)) {
                ftpClient.disconnect();
                log.warn("FTPServer refused connection,replyCode:{}", replyCode);
                return null;
            }

            if (!ftpClient.login(config.getUsername(), config.getPassword())) {
                log.warn("ftpClient login failed... username is {}; password: {}", config.getUsername(), config.getPassword());
            }

            ftpClient.setBufferSize(config.getBufferSize());
            ftpClient.setFileType(config.getTransferFileType());
            if (config.isPassiveMode()) {
                ftpClient.enterLocalPassiveMode();
            }

        } catch (IOException e) {
            log.error("create ftp connection failed...", e);
        }
        return ftpClient;
    }

    /**
     * 用PooledObject封装对象放入池中
     */
    @Override
    public PooledObject<FTPClient> wrap(FTPClient ftpClient) {
        return new DefaultPooledObject<>(ftpClient);
    }

    /**
     * 销毁FtpClient对象
     */
    @Override
    public void destroyObject(PooledObject<FTPClient> ftpPooled) {
        if (ftpPooled == null) {
            return;
        }

        FTPClient ftpClient = ftpPooled.getObject();

        try {
            if (ftpClient.isConnected()) {
                ftpClient.logout();
            }
        } catch (IOException io) {
            log.error("ftp client logout failed...{}", io);
        } finally {
            try {
                ftpClient.disconnect();
            } catch (IOException io) {
                log.error("close ftp client failed...{}", io);
            }
        }
    }

    /**
     * 验证FtpClient对象
     */
    @Override
    public boolean validateObject(PooledObject<FTPClient> ftpPooled) {
        try {
            FTPClient ftpClient = ftpPooled.getObject();
            return ftpClient.sendNoOp();
        } catch (IOException e) {
            log.error("Failed to validate client: {}", e);
        }
        return false;
    }

}

GenericObjectPool<FTPClient> ftpClientPool = new GenericObjectPool<>(new FtpClientFactory());

public interface ObjectPool<T> extends Closeable {
    // 从池中获取一个对象
    T borrowObject();
	// 归还一个对象到池中
    void returnObject(T obj);
    // 废弃一个失效的对象
    void invalidateObject(T obj); 
    // 添加对象到池
    void addObject();
	// 清空对象池
    void clear();
    // 关闭对象池
    void close();
}

public class FtpClientPool extends BaseObjectPool<FTPClient> {

    private static final int DEFAULT_POOL_SIZE = 8;

    private final BlockingQueue<FTPClient> ftpBlockingQueue;
    private final FtpClientFactory ftpClientFactory;


    /**
     * 初始化连接池，需要注入一个工厂来提供FTPClient实例
     *
     * @param ftpClientFactory ftp工厂
     * @throws Exception
     */
    public FtpClientPool(FtpClientFactory ftpClientFactory) throws Exception {
        this(DEFAULT_POOL_SIZE, ftpClientFactory);
    }

    public FtpClientPool(int poolSize, FtpClientFactory factory) throws Exception {
        this.ftpClientFactory = factory;
        ftpBlockingQueue = new ArrayBlockingQueue<>(poolSize);
        initPool(poolSize);
    }

    /**
     * 初始化连接池，需要注入一个工厂来提供FTPClient实例
     *
     * @param maxPoolSize 最大连接数
     * @throws Exception
     */
    private void initPool(int maxPoolSize) throws Exception {
        for (int i = 0; i < maxPoolSize; i++) {
            // 往池中添加对象
            addObject();
        }
    }

    /**
     * 从连接池中获取对象
     */
    @Override
    public FTPClient borrowObject() throws Exception {
        FTPClient client = ftpBlockingQueue.take();
        if (ObjectUtils.isEmpty(client)) {
            client = ftpClientFactory.create();
            // 放入连接池
            returnObject(client);
            // 验证对象是否有效
        } else if (!ftpClientFactory.validateObject(ftpClientFactory.wrap(client))) {
            // 对无效的对象进行处理
            invalidateObject(client);
            // 创建新的对象
            client = ftpClientFactory.create();
            // 将新的对象放入连接池
            returnObject(client);
        }
        return client;
    }

    /**
     * 返还对象到连接池中
     */
    @Override
    public void returnObject(FTPClient client) {
        try {
            if (client != null && !ftpBlockingQueue.offer(client, 3, TimeUnit.SECONDS)) {
                ftpClientFactory.destroyObject(ftpClientFactory.wrap(client));
            }
        } catch (InterruptedException e) {
            log.error("return ftp client interrupted ...{}", e);
        }
    }

    /**
     * 移除无效的对象
     */
    @Override
    public void invalidateObject(FTPClient client) {
        try {
            client.changeWorkingDirectory("/");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            ftpBlockingQueue.remove(client);
        }
    }

    /**
     * 增加一个新的链接，超时失效
     */
    @Override
    public void addObject() throws Exception {
        // 插入对象到队列
        ftpBlockingQueue.offer(ftpClientFactory.create(), 3, TimeUnit.SECONDS);
    }

    /**
     * 关闭连接池
     */
    @Override
    public void close() {
        try {
            while (ftpBlockingQueue.iterator().hasNext()) {
                FTPClient client = ftpBlockingQueue.take();
                ftpClientFactory.destroyObject(ftpClientFactory.wrap(client));
            }
        } catch (Exception e) {
            log.error("close ftp client ftpBlockingQueue failed...{}", e);
        }
    }

}