使用 sshj 读取 SFTP 服务器文件

maven 依赖：

    <!-- https://mvnrepository.com/artifact/com.hierynomus/sshj -->
    <dependency>
      <groupId>com.hierynomus</groupId>
      <artifactId>sshj</artifactId>
      <version>0.34.0</version>
    </dependency>

打开链接：

try (SSHClient sshClient = SSHClientUtil.getSSHClient("localhost", 22, "root", "123456");
             SFTPClient sftpClient = sshClient.newSFTPClient()) {


        } catch (IOException e) {
            throw new RuntimeException(e);
        }

执行 ls 命令输出路径：

for (RemoteResourceInfo remoteResourceInfo : sftpClient.ls("/data")) {
     // System.out.println(remoteResourceInfo.getName());
     System.out.println(remoteResourceInfo.getPath());
     // System.out.println(remoteResourceInfo.getParent());
}

打开一个文本文件，并读取 128 字节的文件内容：

try (RemoteFile remoteFile = sftpClient.open("/data/temp/SFTP_TEST_FILE")) {
                FileAttributes fileAttributes = remoteFile.fetchAttributes();

                int maxPreviewSize = Math.toIntExact(128 > fileAttributes.getSize() ? fileAttributes.getSize() : 128);

                byte[] fileBytes = new byte[maxPreviewSize];

                remoteFile.read(0, fileBytes, 0, maxPreviewSize);

                String fileContent = new String(fileBytes);

                String[] fileLines = fileContent.split("\n");
                // 最后一行可能为不完整数据，不取最后一行第内容
                for (int i = 0; i < fileLines.length - 1; i++) {
                    System.out.println("文件第 " + i + "行：" + fileLines[i]);
                }

                // System.out.println("文件内容：" + fileContent);

                System.out.println(fileAttributes.getSize());

                 System.out.println(remoteFile.getPath());
                 System.out.println(remoteFile.length());
            }

打开一个文件并将文件输出到文件为流，合并两个文件流，然后保存到文件：

String fieldList = "name|password|age\n";

            try (RemoteFile remoteFile = sftpClient.open("/data/temp/SFTP_TEST_FILE");
                 InputStream inputStream = remoteFile.new RemoteFileInputStream(0);
                 InputStream sequenceInputStream = new SequenceInputStream(new ByteArrayInputStream(fieldList.getBytes()), inputStream);
                 BufferedReader bfr = new BufferedReader(new InputStreamReader(sequenceInputStream));
                 OutputStream outputStream = new FileOutputStream("/data/temp/filemerge1.txt")) {


                int tmp;
                while ((tmp = sequenceInputStream.read()) != -1) {

                    outputStream.write(tmp);

                }

                // FileAttributes fileAttributes = remoteFile.fetchAttributes();

                /*String line;
                while ((line = bfr.readLine()) != null) {

                    System.out.println(line);

                }*/


            }

参考：

https://github.com/hierynomus/sshj

https://www.baeldung.com/java-file-sftp

https://stackoverflow.com/questions/35358762/list-all-files-in-remote-server-using-jsch