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前言：开发中的需求要去对方的 ftp 服务器下载文件，这里下载文件采用 ftp 方式，下载之后程序再去解析文件的内容，然后再存数据库。下载过来的文件默认是 zip 格式，需要解压 unzip 一下，然后里面有一个 csv 文件，用 easyecel 读取 csv 中的数据，至此需求梳理完成。这里每次取下载或者操作 ftp 的时候都要新建一个连接，用完再主动关闭，这里并未复用此连接，相当于说每次都是新建一个连接，这样不好，因此对这里进行设计改造。

引入 pom 依赖

        <!-- SFTP --><dependency><groupId>com.jcraft</groupId><artifactId>jsch</artifactId><version>0.1.55</version></dependency><!-- commons-pool2 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId><version>2.6.1</version></dependency>

定义yml文件配置信息

sftp:mft:sftp-host: 101.233.389.58sftp-port: 80219sftp-username: usersftp-password: 789678sftp-path: /file/mftsave-path: /mftpool:max-total: 10max-idle: 10min-idle: 5

定义配置属性SftpProperties 信息

读取yml中的属性信息，注意@ConfigurationProperties(prefix = "sftp.mft")注解是定义属性，下面的
sftpHost属性就读取到了yml文件中配置的信息，但是类中的maxTotal和yml文件中的max-total是怎么映射的呢？注意看yml中有一个pool下面 类中有一个private Pool pool = new Pool();把pool改个名字就从yml文件点不进来了，说明是根据此来映射的

package x.x.config.sftpPool;import com.jcraft.jsch.ChannelSftp;
import lombok.Data;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import org.springframework.boot.context.properties.ConfigurationProperties;@Data
@ConfigurationProperties(prefix = "sftp.mft")
public class SftpProperties {private String sftpHost;private int sftpPort;private String sftpUsername;private String sftpPassword;private String sftpPath;private String savePath;private Pool pool = new Pool();public static class Pool extends GenericObjectPoolConfig<ChannelSftp> {private int maxTotal = DEFAULT_MAX_TOTAL;private int maxIdle = DEFAULT_MAX_IDLE;private int minIdle = DEFAULT_MIN_IDLE;public Pool() {super();}@Overridepublic int getMaxTotal() {return maxTotal;}@Overridepublic void setMaxTotal(int maxTotal) {this.maxTotal = maxTotal;}@Overridepublic int getMaxIdle() {return maxIdle;}@Overridepublic void setMaxIdle(int maxIdle) {this.maxIdle = maxIdle;}@Overridepublic int getMinIdle() {return minIdle;}@Overridepublic void setMinIdle(int minIdle) {this.minIdle = minIdle;}}
}

定义工厂类

生产sftp连接，获取上一步定义好的属性 SftpProperties 实现三个方法，create方法创建连接

package x.x.config.sftpPool;import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.pool2.BasePooledObjectFactory;
import org.apache.commons.pool2.PooledObject;
import org.apache.commons.pool2.impl.DefaultPooledObject;import java.util.Properties;@Data
@Slf4j
public class SftpFactory extends BasePooledObjectFactory<ChannelSftp> {private SftpProperties properties;public SftpFactory(SftpProperties properties) {this.properties = properties;}@Overridepublic ChannelSftp create() {try {JSch jsch = new JSch();Session sshSession = jsch.getSession(properties.getSftpUsername(), properties.getSftpHost(), properties.getSftpPort());sshSession.setPassword(properties.getSftpPassword());Properties sshConfig = new Properties();sshConfig.put("StrictHostKeyChecking", "no");sshSession.setConfig(sshConfig);sshSession.connect();ChannelSftp channel = (ChannelSftp) sshSession.openChannel("sftp");channel.connect();return channel;}catch (JSchException e){throw new RuntimeException("连接sfpt失败", e);}}@Overridepublic PooledObject<ChannelSftp> wrap(ChannelSftp channelSftp) {return new DefaultPooledObject<>(channelSftp);}@Overridepublic void destroyObject(PooledObject<ChannelSftp> p) throws Exception {ChannelSftp channelSftp = p.getObject();channelSftp.disconnect();}
}

定义池子

引入工厂制造，此处会根据yml文件配置的属性生成连接

package x.x.config.sftpPool;import com.jcraft.jsch.ChannelSftp;
import lombok.Data;
import org.apache.commons.pool2.impl.GenericObjectPool;@Data
public class SftpPool {private GenericObjectPool<ChannelSftp> pool;public SftpPool(SftpFactory factory) {this.pool = new GenericObjectPool<>(factory, factory.getProperties().getPool());}/*** 获取一个sftp连接对象* @return sftp连接对象*/public ChannelSftp borrowObject() {try {return pool.borrowObject();} catch (Exception e) {throw new RuntimeException("获取ftp连接失败", e);}}/*** 归还一个sftp连接对象* @param channelSftp sftp连接对象*/public void returnObject(ChannelSftp channelSftp) {if (channelSftp!=null) {pool.returnObject(channelSftp);}}
}

定义help类操作

引入pool直接操作获取，用完返回

package x.x.config.sftpPool;import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.SftpATTRS;
import com.jcraft.jsch.SftpException;
import lombok.extern.slf4j.Slf4j;import java.io.*;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;@Slf4j
public class SftpHelper {private SftpPool pool;public SftpHelper(SftpPool pool) {this.pool = pool;}public void createDir(String createPath) throws Exception {ChannelSftp channelSftp = pool.borrowObject();try {channelSftp.cd("/");if (!isDirExist(createPath)) {String[] pathArry = createPath.split("/");for (String path : pathArry) {if ("".equals(path)) {continue;}if (isDirExist(path)) {channelSftp.cd(path);} else {// 建立目录channelSftp.mkdir(path);// 进入并设置为当前目录channelSftp.cd(path);}}} else {channelSftp.cd(createPath);}} catch (SftpException e) {log.error(e.getMessage(), e);throw new Exception("创建路径错误：" + createPath);}finally {pool.returnObject(channelSftp);}}public boolean isDirExist(String directory) {ChannelSftp channelSftp = pool.borrowObject();boolean isDirExistFlag = false;try {channelSftp.cd("/");SftpATTRS sftpATTRS = channelSftp.lstat(directory);isDirExistFlag = true;channelSftp.cd(directory);return sftpATTRS.isDir();} catch (Exception e) {log.error(e.getMessage(), e);if ("no such file".equals(e.getMessage().toLowerCase())) {isDirExistFlag = false;}}finally {pool.returnObject(channelSftp);}return isDirExistFlag;}/*** 文件上传** @param directory   目录* @param fileName    要上传的文件名*/public void uploadFile(ChannelSftp uploadChannelSftp, String directory, String sourceFilePath, String fileName) {ChannelSftp channelSftp = pool.borrowObject();//获取输入流InputStream inputStream = null;try {inputStream = uploadChannelSftp.get(sourceFilePath);} catch (SftpException e) {e.printStackTrace();throw new RuntimeException(e);}finally {pool.returnObject(channelSftp);}try {channelSftp.cd(directory);//写入文件channelSftp.put(inputStream, fileName);} catch (Exception e) {e.printStackTrace();throw new RuntimeException("文件上传异常：" + e.getMessage());} finally {pool.returnObject(channelSftp);if (inputStream != null) {try {inputStream.close();} catch (IOException e) {throw new RuntimeException("Close stream error." + e.getMessage());}}}}/*** 列出目下下的所有文件** @param sftpPath    文件路径* @return 文件名* @throws Exception 异常*/public List<String> listFiles(String sftpPath) {ChannelSftp channelSftp = pool.borrowObject();Vector fileList = null;List<String> fileNameList = new ArrayList<>();try {fileList = channelSftp.ls(sftpPath);} catch (SftpException e) {throw new RuntimeException(e);}Iterator it = fileList.iterator();while (it.hasNext()) {String fileName = ((ChannelSftp.LsEntry) it.next()).getFilename();if (".".equals(fileName) || "..".equals(fileName)) {continue;}fileNameList.add(fileName);}pool.returnObject(channelSftp);return fileNameList;}/*** 下载文件。** @param sourceDirectory    下载目录* @param downloadFile 下载的文件* @param targetSaveDirectory     存在本地的路径*/public void downloadFile(String sourceDirectory, String downloadFile, String targetSaveDirectory) throws RuntimeException {ChannelSftp channelSftp = pool.borrowObject();OutputStream targetFile = null;try {if (sourceDirectory != null && !"".equals(sourceDirectory)) {channelSftp.cd(sourceDirectory);}File folder = new File(targetSaveDirectory);// 确保文件夹存在if (!folder.exists()) {if (!folder.mkdirs()) {log.error("无法创建文件夹");return;}}targetFile = new FileOutputStream(new File(targetSaveDirectory, downloadFile));channelSftp.get(downloadFile, targetFile);} catch (Exception e) {throw new RuntimeException(e);} finally {pool.returnObject(channelSftp);try {targetFile.close();} catch (IOException e) {throw new RuntimeException(e);}}}/*** 删除文件** @param directory  要删除文件所在目录* @param deleteFile 要删除的文件*/public void deleteFile(String directory, String deleteFile) throws Exception {ChannelSftp channelSftp = pool.borrowObject();try {channelSftp.cd(directory);channelSftp.rm(deleteFile);} catch (Exception e) {throw new Exception("文件删除失败" + e.getMessage());}finally {pool.returnObject(channelSftp);}}/*** 检查文件路径是否存在** @param path 文件路径* @return true/false*/public boolean checkedFileDirectory(String path) {ChannelSftp channelSftp = pool.borrowObject();File file = new File(path);if (!file.exists() && !file.isDirectory()) {log.info("file or dir not exist, will create it : "+ path);file.setWritable(true, false);return file.mkdirs();}pool.returnObject(channelSftp);return true;}
}

配置bean信息

SftpFactory 工厂的建立依赖于SftpProperties 配置属性，SftpProperties 是通过注解@EnableConfigurationProperties引入

SftpPool 池子依赖于工厂SftpFactory 创建连接

sftpHelper 操作类依赖于 池子SftpPool中的连接操作具体的文件

package x.x.config.sftpPool;import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
@EnableConfigurationProperties(SftpProperties.class)
public class SftpConfig {// 工厂@Beanpublic SftpFactory sftpFactory(SftpProperties properties) {return new SftpFactory(properties);}// 连接池@Beanpublic SftpPool sftpPool(SftpFactory sftpFactory) {return new SftpPool(sftpFactory);}// 辅助类@Beanpublic SftpHelper sftpHelper(SftpPool sftpPool) {return new SftpHelper(sftpPool);}
}

至此一个简单的池子就完成了