Java8实现FTP及SFTP文件上传下载

<!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
<dependency>
  <groupId>com.jcraft</groupId>
  <artifactId>jsch</artifactId>
  <version>0.1.54</version>
</dependency>

import sun.net.ftp.FtpClient;
import sun.net.ftp.FtpProtocolException;

import java.io.*;
import java.net.InetSocketAddress;
import java.net.SocketAddress;

/**
 * Java自带的API对FTP的操作
 */
public class Test {
  private FtpClient ftpClient;

  Test(){
     /*
    使用默认的端口号、用户名、密码以及根目录连接FTP服务器
     */
    this.connectServer("192.168.56.130", 21, "jiashubing", "123456", "/home/jiashubing/ftp/anonymous/");
  }

  public void connectServer(String ip, int port, String user, String password, String path) {
    try {
      /* ******连接服务器的两种方法*******/
      ftpClient = FtpClient.create();
      try {
        SocketAddress addr = new InetSocketAddress(ip, port);
        ftpClient.connect(addr);
        ftpClient.login(user, password.toCharArray());
        System.out.println("login success!");
        if (path.length() != 0) {
          //把远程系统上的目录切换到参数path所指定的目录
          ftpClient.changeDirectory(path);
        }
      } catch (FtpProtocolException e) {
        e.printStackTrace();
      }
    } catch (IOException ex) {
      ex.printStackTrace();
      throw new RuntimeException(ex);
    }
  }

  /**
   * 关闭连接
   */
  public void closeConnect() {
    try {
      ftpClient.close();
      System.out.println("disconnect success");
    } catch (IOException ex) {
      System.out.println("not disconnect");
      ex.printStackTrace();
      throw new RuntimeException(ex);
    }
  }

  /**
   * 上传文件
   * @param localFile 本地文件
   * @param remoteFile 远程文件
   */
  public void upload(String localFile, String remoteFile) {
    File file_in = new File(localFile);
    try(OutputStream os = ftpClient.putFileStream(remoteFile);
      FileInputStream is = new FileInputStream(file_in)) {
      byte[] bytes = new byte[1024];
      int c;
      while ((c = is.read(bytes)) != -1) {
        os.write(bytes, 0, c);
      }
      System.out.println("upload success");
    } catch (IOException ex) {
      System.out.println("not upload");
      ex.printStackTrace();
    } catch (FtpProtocolException e) {
      e.printStackTrace();
    }
  }

  /**
   * 下载文件。获取远程机器上的文件filename，借助TelnetInputStream把该文件传送到本地。
   * @param remoteFile 远程文件路径(服务器端)
   * @param localFile 本地文件路径(客户端)
   */
  public void download(String remoteFile, String localFile) {
    File file_in = new File(localFile);
    try(InputStream is = ftpClient.getFileStream(remoteFile);
      FileOutputStream os = new FileOutputStream(file_in)){

      byte[] bytes = new byte[1024];
      int c;
      while ((c = is.read(bytes)) != -1) {
        os.write(bytes, 0, c);
      }
      System.out.println("download success");
    } catch (IOException ex) {
      System.out.println("not download");
      ex.printStackTrace();
    }catch (FtpProtocolException e) {
      e.printStackTrace();
    }
  }

  public static void main(String agrs[]) {
    Test fu = new Test();

    //下载测试
    String filepath[] = {"aa.xlsx","bb.xlsx"};
    String localfilepath[] = {"E:/lalala/aa.xlsx","E:/lalala/bb.xlsx"};
    for (int i = 0; i < filepath.length; i++) {
      fu.download(filepath[i], localfilepath[i]);
    }
    //上传测试
    String localfile = "E:/lalala/tt.xlsx";
    String remotefile = "tt.xlsx";        //上传
    fu.upload(localfile, remotefile);
    fu.closeConnect();
  }
}

import com.jcraft.jsch.*;

import java.util.Properties;

/**
 * 解释一下SFTP的整个调用过程，这个过程就是通过Ip、Port、Username、Password获取一个Session,
 * 然后通过Session打开SFTP通道（获得SFTP Channel对象）,再在建立通道（Channel）连接，最后我们就是
 * 通过这个Channel对象来调用SFTP的各种操作方法.总是要记得，我们操作完SFTP需要手动断开Channel连接与Session连接。
 * @author jiashubing
 * @since 2018/5/8
 */
public class SftpCustom {

  private ChannelSftp channel;
  private Session session;
  private String sftpPath;

  SftpCustom() {
     /*
     使用端口号、用户名、密码以连接SFTP服务器
     */
    this.connectServer("192.168.56.130", 22, "jiashubing", "123456", "/home/ftp/");
  }

  SftpCustom(String ftpHost, int ftpPort, String ftpUserName, String ftpPassword, String sftpPath) {
    this.connectServer(ftpHost, ftpPort, ftpUserName, ftpPassword, sftpPath);
  }

  public void connectServer(String ftpHost, int ftpPort, String ftpUserName, String ftpPassword, String sftpPath) {
    try {
      this.sftpPath = sftpPath;

      // 创建JSch对象
      JSch jsch = new JSch();
      // 根据用户名，主机ip，端口获取一个Session对象
      session = jsch.getSession(ftpUserName, ftpHost, ftpPort);
      if (ftpPassword != null) {
        // 设置密码
        session.setPassword(ftpPassword);
      }
      Properties configTemp = new Properties();
      configTemp.put("StrictHostKeyChecking", "no");
      // 为Session对象设置properties
      session.setConfig(configTemp);
      // 设置timeout时间
      session.setTimeout(60000);
      session.connect();
      // 通过Session建立链接
      // 打开SFTP通道
      channel = (ChannelSftp) session.openChannel("sftp");
      // 建立SFTP通道的连接
      channel.connect();
    } catch (JSchException e) {
      //throw new RuntimeException(e);
    }
  }

  /**
   * 断开SFTP Channel、Session连接
   */
  public void closeChannel() {
    try {
      if (channel != null) {
        channel.disconnect();
      }
      if (session != null) {
        session.disconnect();
      }
    } catch (Exception e) {
      //
    }
  }

  /**
   * 上传文件
   *
   * @param localFile 本地文件
   * @param remoteFile 远程文件
   */
  public void upload(String localFile, String remoteFile) {
    try {
      remoteFile = sftpPath + remoteFile;
      channel.put(localFile, remoteFile, ChannelSftp.OVERWRITE);
      channel.quit();
    } catch (SftpException e) {
      //e.printStackTrace();
    }
  }

  /**
   * 下载文件
   *
   * @param remoteFile 远程文件
   * @param localFile 本地文件
   */
  public void download(String remoteFile, String localFile) {
    try {
      remoteFile = sftpPath + remoteFile;
      channel.get(remoteFile, localFile);
      channel.quit();
    } catch (SftpException e) {
      //e.printStackTrace();
    }
  }

  public static void main(String[] args) {
    SftpCustom sftpCustom = new SftpCustom();
    //上传测试
    String localfile = "E:/lalala/tt.xlsx";
    String remotefile = "/home/ftp/tt2.xlsx";
    sftpCustom.upload(localfile, remotefile);
    //下载测试
    sftpCustom.download(remotefile, "E:/lalala/tt3.xlsx");
    sftpCustom.closeChannel();
  }
}