ftp连接池的实现

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前言

FTPClient经常销毁和重新生成会很耗资源，因此需要创建ftp连接池，使用完ftp连接后归还给连接池。

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一、引入依赖

  <!-- https://mvnrepository.com/artifact/commons-net/commons-net -->
<dependency>
    <groupId>commons-net</groupId>
    <artifactId>commons-net</artifactId>
    <version>3.8.0</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-dbcp2</artifactId>
    <version>2.9.0</version>
</dependency>

二、线程池实现

1、配置类

@EnableConfigurationProperties
@ConfigurationProperties(prefix = "ftp.client")
@Component
@Data
public class FtpPoolConfig extends GenericObjectPoolConfig {
    
    
    private String host;
    private int port = 21;
    private String username;
    private String password;
    private String passiveMode;
    private String encoding;
    private int clientTimeout;
    private int transferFileType;
}

2、配置文件

ftp.client.host=172.16.10.151
ftp.client.port=21
ftp.client.username=root
ftp.client.password=password123
ftp.client.encoding=utf-8
ftp.client.passiveMode=true
ftp.client.connectTimeout=30000
ftp.client.transferFileType=2

3、连接池

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.PooledObjectFactory;
import org.apache.commons.pool2.impl.DefaultPooledObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.io.IOException;

@Component
@Slf4j
public class FtpClientFactory implements PooledObjectFactory<FTPClient> {
    
    
    @Autowired
    private FtpPoolConfig config;

    @Override
    public void destroyObject(PooledObject<FTPClient> pool) throws Exception {
    
    
        FTPClient ftpClient = pool.getObject();
        if (ftpClient != null) {
    
    
            try {
    
    
                ftpClient.disconnect();
                log.debug("销毁ftp连接");
            } catch (Exception e) {
    
    
                log.error("销毁ftpClient异常，error：", e.getMessage());
            }
        }
    }

    @Override
    public PooledObject<FTPClient> makeObject() throws Exception {
    
    

        FTPClient ftpClient = new FTPClient();
        ftpClient.setConnectTimeout(config.getClientTimeout());
        ftpClient.connect(config.getHost(), config.getPort());
        int reply = ftpClient.getReplyCode();
        if (!FTPReply.isPositiveCompletion(reply)) {
    
    
            ftpClient.disconnect();
            return null;
        }
        boolean success = false;
        if (StringUtils.isBlank(config.getUsername())) {
    
    
            success = ftpClient.login("anonymous", "anonymous");
        } else {
    
    
            success = ftpClient.login(config.getUsername(), config.getPassword());
        }
        if (!success) {
    
    
            return null;
        }
        ftpClient.setFileType(config.getTransferFileType());
        ftpClient.setBufferSize(1024);
        ftpClient.setControlEncoding(config.getEncoding());
        if (config.getPassiveMode() != null && config.getPassiveMode().equals("true")) {
    
    
            ftpClient.enterLocalPassiveMode();
        }
        log.debug("创建ftp连接");
        return new DefaultPooledObject<>(ftpClient);
    }

    @Override
    public boolean validateObject(PooledObject<FTPClient> pool) {
    
    
        FTPClient ftpClient = pool.getObject();
        try {
    
    
            return ftpClient != null && ftpClient.sendNoOp();
        } catch (IOException e) {
    
    
            return false;
        }
    }

    @Override
    public void passivateObject(PooledObject<FTPClient> p) throws Exception {
    
    
    }

    @Override
    public void activateObject(PooledObject<FTPClient> pool) throws Exception {
    
    
    }
}

4、操作接口

import org.apache.commons.net.ftp.FTPClient;

public interface FtpPoolService {
    
    
    /**
     * 获取ftpClient
     */
    FTPClient borrowObject() throws Exception;

    /**
     * 归还ftpClient
     */
    void returnObject(FTPClient ftpClient) throws Exception;

}

5、操作实现类

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;


@Component
public class FtpPoolServiceImpl implements FtpPoolService {
    
    
    private GenericObjectPool<FTPClient> pool;
    @Autowired
    private FtpPoolConfig config;
    @Autowired
    private FtpClientFactory factory;

    /**
     * 初始化pool
     */
    @PostConstruct
    private void initPool() {
    
    
        config.setTestOnBorrow(true);
        config.setTestOnReturn(true);
        this.pool = new GenericObjectPool<FTPClient>(this.factory, this.config);
    }

    /**
     * 获取ftpClient
     */
    @Override
    public FTPClient borrowObject() throws Exception {
    
    
        if (this.pool != null) {
    
    
            return this.pool.borrowObject();
        }
        return null;
    }

    /**
     * 归还 ftpClient
     */
    @Override
    public void returnObject(FTPClient ftpClient) {
    
    
        if (this.pool != null && ftpClient != null) {
    
    
            this.pool.returnObject(ftpClient);
        }
    }
}