Java连接服务器的两种方式SFTP和FTP

<!--ftp文件上传-->
<dependency>
    <groupId>commons-net</groupId>
    <artifactId>commons-net</artifactId>
    <version>3.6</version>
</dependency>

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.io.*;
@Component
public class FtpUtil {
    private static final Logger logger = LoggerFactory.getLogger(FtpUtil.class);
    //ftp服务器地址
    @Value("${ftp.server}")
    private String hostname;
    //ftp服务器端口
    @Value("${ftp.port}")
    private int port;
    //ftp登录账号
    @Value("${ftp.userName}")
    private String username;
    //ftp登录密码
    @Value("${ftp.userPassword}")
    private String password;
    /**
    * 初始化FTP服务器
    *
    * @return
    */
    public FTPClient getFtpClient() {
        FTPClient ftpClient = new FTPClient();
        ftpClient.setControlEncoding("UTF-8");
        try {
            //设置连接超时时间
            ftpClient.setDataTimeout(1000 * 120);
            logger.info("连接FTP服务器中:" + hostname + ":" + port);
            //连接ftp服务器
            ftpClient.connect(hostname, port);
            //登录ftp服务器
            ftpClient.login(username, password);
            // 是否成功登录服务器
            int replyCode = ftpClient.getReplyCode();
            if (FTPReply.isPositiveCompletion(replyCode)) {
                logger.info("连接FTP服务器成功:" + hostname + ":" + port);
            } else {
                logger.error("连接FTP服务器失败:" + hostname + ":" + port);
                closeFtpClient(ftpClient);
            }
        } catch (IOException e) {
            logger.error("连接ftp服务器异常", e);
        }
        return ftpClient;
    }
    /**
     * 上传文件
     *
     * @param pathName    路径
     * @param fileName    文件名
     * @param inputStream 输入文件流
     * @return
     */
    public boolean uploadFileToFtp(String pathName, String fileName, InputStream inputStream) {
        boolean isSuccess = false;
        FTPClient ftpClient = getFtpClient();
        try {
            if (ftpClient.isConnected()) {
                logger.info("开始上传文件到FTP,文件名称:" + fileName);
                //设置上传文件类型为二进制，否则将无法打开文件
                ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
                //路径切换，如果目录不存在创建目录
                if (!ftpClient.changeWorkingDirectory(pathName)) {
                    boolean flag = this.changeAndMakeWorkingDir(ftpClient, pathName);
                    if (!flag) {
                        logger.error("路径切换(创建目录)失败");
                        return false;
                    }
                }
                //设置被动模式，文件传输端口设置(如上传文件夹成功，不能上传文件，注释这行，否则报错refused:connect)
                ftpClient.enterLocalPassiveMode();
                ftpClient.storeFile(fileName, inputStream);
                inputStream.close();
                ftpClient.logout();
                isSuccess = true;
                logger.info(fileName + "文件上传到FTP成功");
            } else {
                logger.error("FTP连接建立失败");
            }
        } catch (Exception e) {
            logger.error(fileName + "文件上传异常", e);
 
        } finally {
            closeFtpClient(ftpClient);
            closeStream(inputStream);
        }
        return isSuccess;
    }
    /**
     * 删除文件
     *
     * @param pathName 路径
     * @param fileName 文件名
     * @return
     */
    public boolean deleteFile(String pathName, String fileName) {
        boolean flag = false;
        FTPClient ftpClient = getFtpClient();
        try {
            logger.info("开始删除文件");
            if (ftpClient.isConnected()) {
                //路径切换
                ftpClient.changeWorkingDirectory(pathName);
                ftpClient.enterLocalPassiveMode();
                ftpClient.dele(fileName);
                ftpClient.logout();
                flag = true;
                logger.info("删除文件成功");
            } else {
                logger.info("删除文件失败");
            }
        } catch (Exception e) {
            logger.error(fileName + "文件删除异常", e);
        } finally {
            closeFtpClient(ftpClient);
        }
        return flag;
    }
    /**
     * 关闭FTP连接
     *
     * @param ftpClient
     */
    public void closeFtpClient(FTPClient ftpClient) {
        if (ftpClient.isConnected()) {
            try {
                ftpClient.disconnect();
            } catch (IOException e) {
                logger.error("关闭FTP连接异常", e);
            }
        }
    }
    /**
     * 关闭文件流
     *
     * @param closeable
     */
    public void closeStream(Closeable closeable) {
        if (null != closeable) {
            try {
                closeable.close();
            } catch (IOException e) {
                logger.error("关闭文件流异常", e);
            }
        }
    }
    /**
     * 路径切换（没有则创建）
     *
     * @param ftpClient FTP服务器
     * @param path      路径
     */
    public void changeAndMakeWorkingDir(FTPClient ftpClient, String path) {
        boolean flag = false;
        try {
            String[] path_array = path.split("/");
            for (String s : path_array) {
                boolean b = ftpClient.changeWorkingDirectory(s);
                if (!b) {
                    ftpClient.makeDirectory(s);
                    ftpClient.changeWorkingDirectory(s);
                }
            }
            flag = true;
        } catch (IOException e) {
            logger.error("路径切换异常", e);
        }
        return flag;
    }
    /**
     * 从FTP下载到本地文件夹
     *
     * @param ftpClient      FTP服务器
     * @param pathName       路径
     * @param targetFileName 文件名
     * @param localPath      本地路径
     * @return
     */
    public boolean downloadFile(FTPClient ftpClient, String pathName, String targetFileName, String localPath) {
        boolean flag = false;
        OutputStream os = null;
        try {
            System.out.println("开始下载文件");
            //切换FTP目录
            ftpClient.changeWorkingDirectory(pathName);
            ftpClient.enterLocalPassiveMode();
            FTPFile[] ftpFiles = ftpClient.listFiles();
            for (FTPFile file : ftpFiles) {
                String ftpFileName = file.getName();
                if (targetFileName.equalsIgnoreCase(ftpFileName)) {
                    File localFile = new File(localPath + targetFileName);
                    os = new FileOutputStream(localFile);
                    ftpClient.retrieveFile(file.getName(), os);
                    os.close();
                }
            }
            ftpClient.logout();
            flag = true;
            logger.info("下载文件成功");
        } catch (Exception e) {
            logger.error("下载文件失败", e);
        } finally {
            closeFtpClient(ftpClient);
            closeStream(os);
        }
        return flag;
    }
}

<dependency>
    <groupId>com.jcraft</groupId>
    <artifactId>jsch</artifactId>
    <version>0.1.54</version>
</dependency>

import com.jcraft.jsch.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Properties;
import java.util.Vector;
@Component
public class SFTPUtil {
    private static final Logger logger = LoggerFactory.getLogger(SFTPUtil.class);
    private Session session = null;
    private ChannelSftp channel = null;
    private int timeout = 60000;
    /**
    * 连接sftp服务器
    */
    public boolean connect(String ftpUsername, String ftpAddress, int ftpPort, String ftpPassword) {
        boolean isSuccess = false;
        if (channel != null) {
            System.out.println("通道不为空");
            return false;
        }
        //创建JSch对象
        JSch jSch = new JSch();
        try {
            // 根据用户名，主机ip和端口获取一个Session对象
            session = jSch.getSession(ftpUsername, ftpAddress, ftpPort);
            //设置密码
            session.setPassword(ftpPassword);
            Properties config = new Properties();
            config.put("StrictHostKeyChecking", "no");
            //为Session对象设置properties
            session.setConfig(config);
            //设置超时
            session.setTimeout(timeout);
            //通过Session建立连接
            session.connect();
            System.out.println("Session连接成功");
            // 打开SFTP通道
            channel = (ChannelSftp) session.openChannel("sftp");
            // 建立SFTP通道的连接
            channel.connect();
            System.out.println("通道连接成功");
            isSuccess = true;
        } catch (JSchException e) {
            logger.error("连接服务器异常", e);
        }
        return isSuccess;
    }
    /**
     * 关闭连接
     */
    public void close() {
        //操作完毕后，关闭通道并退出本次会话
        if (channel != null && channel.isConnected()) {
            channel.disconnect();
        }
        if (session != null && session.isConnected()) {
            session.disconnect();
        }
    }
    /**
    * 文件上传
    * 采用默认的传输模式：OVERWRITE
    * @param src      输入流
    * @param dst      上传路径
    * @param fileName 上传文件名
    *
    * @throws SftpException
    */
    public boolean upLoadFile(InputStream src, String dst, String fileName) throws SftpException {
        boolean isSuccess = false;
        try {
            if(createDir(dst)) {
                channel.put(src, fileName);
                isSuccess = true;
            }
        } catch (SftpException e) {
            logger.error(fileName + "文件上传异常", e);
        }
        return isSuccess;
    }
    /**
    * 创建一个文件目录
    *
    * @param createpath  路径
    * @return
    */
    public boolean createDir(String createpath) {
        boolean isSuccess = false;
        try {
            if (isDirExist(createpath)) {
                channel.cd(createpath);
                return true;
            }
            String pathArry[] = createpath.split("/");
            StringBuffer filePath = new StringBuffer("/");
            for (String path : pathArry) {
                if (path.equals("")) {
                    continue;
                }
                filePath.append(path + "/");
                if (isDirExist(filePath.toString())) {
                    channel.cd(filePath.toString());
                } else {
                    // 建立目录
                    channel.mkdir(filePath.toString());
                    // 进入并设置为当前目录
                    channel.cd(filePath.toString());
                }
            }
            channel.cd(createpath);
            isSuccess = true;
        } catch (SftpException e) {
            logger.error("目录创建异常！", e);
        }
        return isSuccess;
    }
    /**
     * 判断目录是否存在
     * @param directory     路径
     * @return
     */
    public boolean isDirExist(String directory) {
        boolean isSuccess = false;
        try {
            SftpATTRS sftpATTRS = channel.lstat(directory);
            isSuccess = true;
            return sftpATTRS.isDir();
        } catch (Exception e) {
            if (e.getMessage().toLowerCase().equals("no such file")) {
                isSuccess = false;
            }
        }
        return isSuccess;
    }
    /**
    * 重命名指定文件或目录
    *
    */
    public boolean rename(String oldPath, String newPath) {
        boolean isSuccess = false;
        try {
            channel.rename(oldPath, newPath);
            isSuccess = true;
        } catch (SftpException e) {
            logger.error("重命名指定文件或目录异常", e);
        }
        return isSuccess;
    }
    /**
    * 列出指定目录下的所有文件和子目录。
    */
    public Vector ls(String path) {
        try {
            Vector vector = channel.ls(path);
            return vector;
        } catch (SftpException e) {
            logger.error("列出指定目录下的所有文件和子目录。", e);
        }
        return null;
    }
    /**
    * 删除文件
    *
    * @param directory  linux服务器文件地址
    * @param deleteFile 文件名称
    */
    public boolean deleteFile(String directory, String deleteFile) {
        boolean isSuccess = false;
        try {
            channel.cd(directory);
            channel.rm(deleteFile);
            isSuccess = true;
        } catch (SftpException e) {
            logger.error("删除文件失败", e);
        }
        return isSuccess;
    }
    /**
    * 下载文件
    *
    * @param directory    下载目录
    * @param downloadFile 下载的文件
    * @param saveFile     下载到本地路径
    */
    public boolean download(String directory, String downloadFile, String saveFile) {
        boolean isSuccess = false;
        try {
            channel.cd(directory);
            File file = new File(saveFile);
            channel.get(downloadFile, new FileOutputStream(file));
            isSuccess = true;
        } catch (SftpException e) {
            logger.error("下载文件失败", e);
        } catch (FileNotFoundException e) {
            logger.error("下载文件失败", e);
        }
        return isSuccess;
    }
}