springboot ftp连接池实现

以下是使用SpringBoot实现FTP连接池的步骤：

1.在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
    <version>2.7.0</version>
</dependency>
<dependency>
    <groupId>commons-net</groupId>
    <artifactId>commons-net</artifactId>
    <version>3.6</version>
</dependency>

2.创建FTP连接池配置类FtpClientPoolConfig，配置连接池的最大、最小连接数、连接超时时间等参数。

@Configuration
@ConfigurationProperties(prefix = "ftp.pool")
@Data
public class FtpClientPoolConfig {
    private int maxTotal;
    private int maxIdle;
    private int minIdle;
    private long maxWaitMillis;
    private boolean testOnBorrow;
    private boolean testOnReturn;
    private boolean testWhileIdle;
    private long timeBetweenEvictionRunsMillis;
    private int numTestsPerEvictionRun;
    private long minEvictableIdleTimeMillis;
}

3.创建FTP连接池类FtpClientPool，使用Apache Commons Pool2实现连接池。

@Component
public class FtpClientPool extends GenericObjectPool<FtpClient> {
    public FtpClientPool(FtpClientFactory factory, FtpClientPoolConfig config) {
        super(factory, new GenericObjectPoolConfig());
        this.setMaxTotal(config.getMaxTotal());
        this.setMaxIdle(config.getMaxIdle());
        this.setMinIdle(config.getMinIdle());
        this.setMaxWaitMillis(config.getMaxWaitMillis());
        this.setTestOnBorrow(config.isTestOnBorrow());
        this.setTestOnReturn(config.isTestOnReturn());
        this.setTestWhileIdle(config.isTestWhileIdle());
        this.setTimeBetweenEvictionRunsMillis(config.getTimeBetweenEvictionRunsMillis());
        this.setNumTestsPerEvictionRun(config.getNumTestsPerEvictionRun());
        this.setMinEvictableIdleTimeMillis(config.getMinEvictableIdleTimeMillis());
    }
}

4.创建FTP连接池工厂类FtpClientFactory，用于创建FTP连接对象。

@Component
public class FtpClientFactory extends BasePooledObjectFactory<FtpClient> {
    private FtpClientProperties properties;

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

    @Override
    public FtpClient create() throws Exception {
        FtpClient ftpClient = new FtpClient();
        ftpClient.connect(properties.getHost(), properties.getPort());
        ftpClient.login(properties.getUsername(), properties.getPassword());
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
        ftpClient.setBufferSize(properties.getBufferSize());
        ftpClient.setControlEncoding(properties.getEncoding());
        ftpClient.enterLocalPassiveMode();
        return ftpClient;
    }

    @Override
    public PooledObject<FtpClient> wrap(FtpClient ftpClient) {
        return new DefaultPooledObject<>(ftpClient);
    }

    @Override
    public void destroyObject(PooledObject<FtpClient> p) throws Exception {
        FtpClient ftpClient = p.getObject();
        if (ftpClient.isConnected()) {
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }

    @Override
    public boolean validateObject(PooledObject<FtpClient> p) {
        FtpClient ftpClient = p.getObject();
        try {
            return ftpClient.sendNoOp();
        } catch (IOException e) {
            return false;
        }
    }
}

5.创建FTP连接池属性类FtpClientProperties，用于配置FTP连接的相关参数。

@ConfigurationProperties(prefix = "ftp")
@Data
public class FtpClientProperties {
    private String host;
    private int port;
    private String username;
    private String password;
    private int bufferSize;
    private String encoding;
}

6.在application.yml文件中配置FTP连接池的相关参数。

ftp:
  host: ftp.example.com
  port: 21
  username: username
  password: password
  bufferSize: 1024
  encoding: UTF-8
ftp:
  pool:
    maxTotal: 10
    maxIdle: 5
    minIdle: 1
    maxWaitMillis: 3000
    testOnBorrow: true
    testOnReturn: false
    testWhileIdle: true
    timeBetweenEvictionRunsMillis: 60000
    numTestsPerEvictionRun: -1
    minEvictableIdleTimeMillis: 1800000

7.在需要使用FTP连接的地方，注入FtpClientPool对象，从连接池中获取FTP连接对象。

@Service
public class FtpService {
    @Autowired
    private FtpClientPool ftpClientPool;

    public void uploadFile(String remotePath, String fileName, InputStream inputStream) throws Exception {
        FtpClient ftpClient = ftpClientPool.borrowObject();
        try {
            ftpClient.changeWorkingDirectory(remotePath);
            ftpClient.storeFile(fileName, inputStream);
        } finally {
            ftpClientPool.returnObject(ftpClient);
        }
    }
}