Java implements SFTP file upload, download, delete and other functions, and the following dependency packages need to be introduced in the project.
<dependency>
<groupId>com.jcraft</groupId>
<artifactId>jsch</artifactId>
<version>0.1.49</version>
</dependency>
Because the @Slf4j tag is used to print logs in the tool class, the following dependency packages need to be introduced.
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.6</version>
</dependency>
The Java code and test method are as follows.
package com.test.utils;
import com.jcraft.jsch.*;
import lombok.extern.slf4j.Slf4j;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;
@Slf4j
public class SFTPUtil {
private static ChannelSftp sftp;
private static SFTPUtil instance = null;
private SFTPUtil() {
}
public static SFTPUtil getInstance(String host, int port, String username, String passwd) {
if (instance == null) {
instance = new SFTPUtil();
// 获取连接
sftp = instance.connect(host, port, username, passwd);
} else {
// 获取连接
sftp = instance.connect(host, port, username, passwd);
}
return instance;
}
public static void close() throws JSchException {
if (sftp.isConnected()) {
sftp.disconnect();
sftp.getSession().disconnect();
}
}
/**
* 连接sftp服务器
*
* @param host 主机
* @param port 端口
* @param username 用户名
* @param password 密码
* @return
*/
public ChannelSftp connect(String host, int port, String username, String password) {
ChannelSftp sftp = null;
try {
JSch jsch = new JSch();
jsch.getSession(username, host, port);
Session sshSession = jsch.getSession(username, host, port);
sshSession.setPassword(password);
Properties sshConfig = new Properties();
sshConfig.put("StrictHostKeyChecking", "no");
sshSession.setConfig(sshConfig);
sshSession.connect();
log.info("SFTP session connected.");
Channel channel = sshSession.openChannel("sftp");
channel.connect();
sftp = (ChannelSftp) channel;
log.info("connected to " + host);
} catch (Exception e) {
log.error("SFTP 连接异常", e);
}
return sftp;
}
/**
* 上传文件
*
* @param directory 文件上传路径
* @param uploadFile 要上传的文件
* @return 上传结果
*/
public boolean upload(String directory, String uploadFile) {
try {
sftp.cd(directory);
try {
// 在目标路径下创建二级路径，如不需要，可以注释掉
sftp.mkdir("20200114");
sftp.cd("20200114");
} catch (Exception e) {
log.error("创建文件夹失败");
}
File file = new File(uploadFile);
FileInputStream fileInputStream = new FileInputStream(file);
sftp.put(fileInputStream, file.getName());
fileInputStream.close();
return true;
} catch (Exception e) {
log.error("上传文件失败", e);
return false;
}
}
/**
* 下载文件
*
* @param directory 下载目录
* @param downloadFile 下载的文件
* @param saveFile 存在本地的路径
*/
public Boolean download(String directory, String downloadFile, String saveFile) {
try {
sftp.cd(directory);
File file = new File(saveFile);
sftp.get(downloadFile, new FileOutputStream(file));
return true;
} catch (Exception e) {
log.error("下载文件失败", e);
return false;
}
}
/**
* 删除文件
*
* @param directory 要删除文件所在目录
* @param deleteFile 要删除的文件
*/
public Boolean delete(String directory, String deleteFile) {
try {
sftp.cd(directory);
sftp.rm(deleteFile);
return true;
} catch (Exception e) {
log.info("文件删除异常", e);
return false;
}
}
public static void main(String[] args) {
// SFTP 服务器信息
String host = "48.101.227.5";
int port = 22;
String username = "testuser";
String passwd = "testpassword";
SFTPUtil instance = SFTPUtil.getInstance(host, port, username, passwd);
// 上传文件
String directory = "sftpfile/";
String uploadfile = "D:\\testfile.log";
boolean uploadResult = instance.upload(directory, uploadfile);
log.info("上传文件 {} 结果：{}", uploadfile, uploadResult);
// 下载文件
String directory1 = "/home/testuser/sftpfile/20200114";
String downloadFile = "testfile.log";
String saveFile = "C:\\testfile.log";
boolean downloadResult = instance.download(directory1, downloadFile, saveFile);
log.info("下载文件 {} 结果：{}", (directory1 + "/" + downloadFile), downloadResult);
// 删除文件
String directory2 = "/home/testuser";
String deleteFile = "testcopy.txt";
Boolean deleteResult = instance.delete(directory2, deleteFile);
log.info("删除文件 {} 结果：{}", (directory2 + "/" + deleteFile), deleteResult);
try {
instance.close();
} catch (JSchException e) {
log.info("sftp关闭异常");
}
}
}