A detailed introduction to the function code of java implementing sftp client to upload files and folders

This article mainly introduces the function code of java to implement sftp client to upload files and folders. It has certain reference value. Those who are interested can learn about it.

1. The dependent jar file jsch-0.1.53.jar

2. The login method includes password login and key login

Code:

Main function:

import java.util.Properties;

import com.cloudpower.util.Login;
import com.util.LoadProperties;

public class Ftp {
  public static void main(String[] args) {
    Properties properties = LoadProperties.getProperties();
    Login.login(properties);
  }
}

Code of login page:

package com.cloudpower.util;

import java.io.Console;
import java.util.Properties;

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class Login {

  public static void login(Properties properties) {
    String ip = properties.getProperty("ip");
    String user = properties.getProperty("user");
    String pwd = properties.getProperty("pwd");
    String port = properties.getProperty("port");
    String privateKeyPath = properties.getProperty("privateKeyPath");
    String passphrase = properties.getProperty("passphrase");
    String sourcePath = properties.getProperty("sourcePath");
    String destinationPath = properties.getProperty("destinationPath");

    if (ip != null && !ip.equals("") && user != null && !user.equals("")
        && port != null && !port.equals("") && sourcePath != null
        && !sourcePath.equals("") && destinationPath != null
        && !destinationPath.equals("")) {

      if (privateKeyPath != null && !privateKeyPath.equals("")) {
        sshSftp2(ip, user, Integer.parseInt(port), privateKeyPath,
            passphrase, sourcePath, destinationPath);
      } else if (pwd != null && !pwd.equals("")) {
        sshSftp(ip, user, pwd, Integer.parseInt(port), sourcePath,
            destinationPath);
      } else {
        Console console = System.console();
        System.out.print("Enter password:");
        char[] readPassword = console.readPassword();
        sshSftp(ip, user, new String(readPassword),
            Integer.parseInt(port), sourcePath, destinationPath);
      }
    } else {
      System.out.println("请先设置配置文件");
    }
  }

  /**
   * 密码方式登录
   * 
   * @param ip
   * @param user
   * @param psw
   * @param port
   * @param sPath
   * @param dPath
   */
  public static void sshSftp(String ip, String user, String psw, int port,
      String sPath, String dPath) {
    System.out.println("password login");
    Session session = null;

    JSch jsch = new JSch();
    try {
      if (port <= 0) {
        // 连接服务器，采用默认端口
        session = jsch.getSession(user, ip);
      } else {
        // 采用指定的端口连接服务器
        session = jsch.getSession(user, ip, port);
      }

      // 如果服务器连接不上，则抛出异常
      if (session == null) {
        throw new Exception("session is null");
      }

      // 设置登陆主机的密码
      session.setPassword(psw);// 设置密码
      // 设置第一次登陆的时候提示，可选值：(ask | yes | no)
      session.setConfig("StrictHostKeyChecking", "no");
      // 设置登陆超时时间
      session.connect(300000);
      UpLoadFile.upLoadFile(session, sPath, dPath);
    } catch (Exception e) {
      e.printStackTrace();
    }

    System.out.println("success");
  }

  /**
   * 密匙方式登录
   * 
   * @param ip
   * @param user
   * @param port
   * @param privateKey
   * @param passphrase
   * @param sPath
   * @param dPath
   */
  public static void sshSftp2(String ip, String user, int port,
      String privateKey, String passphrase, String sPath, String dPath) {
    System.out.println("privateKey login");
    Session session = null;
    JSch jsch = new JSch();
    try {
      // 设置密钥和密码
      // 支持密钥的方式登陆，只需在jsch.getSession之前设置一下密钥的相关信息就可以了
      if (privateKey != null && !"".equals(privateKey)) {
        if (passphrase != null && "".equals(passphrase)) {
          // 设置带口令的密钥
          jsch.addIdentity(privateKey, passphrase);
        } else {
          // 设置不带口令的密钥
          jsch.addIdentity(privateKey);
        }
      }
      if (port <= 0) {
        // 连接服务器，采用默认端口
        session = jsch.getSession(user, ip);
      } else {
        // 采用指定的端口连接服务器
        session = jsch.getSession(user, ip, port);
      }
      // 如果服务器连接不上，则抛出异常
      if (session == null) {
        throw new Exception("session is null");
      }
      // 设置第一次登陆的时候提示，可选值：(ask | yes | no)
      session.setConfig("StrictHostKeyChecking", "no");
      // 设置登陆超时时间
      session.connect(300000);
      UpLoadFile.upLoadFile(session, sPath, dPath);
      System.out.println("success");
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

}

File upload code:

package com.cloudpower.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Scanner;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;

public class UpLoadFile {
  public static void upLoadFile(Session session, String sPath, String dPath) {

    Channel channel = null;
    try {
      channel = (Channel) session.openChannel("sftp");
      channel.connect(10000000);
      ChannelSftp sftp = (ChannelSftp) channel;
      try {
        sftp.cd(dPath);
        Scanner scanner = new Scanner(System.in);
        System.out.println(dPath + ":此目录已存在,文件可能会被覆盖!是否继续y/n?");
        String next = scanner.next();
        if (!next.toLowerCase().equals("y")) {
          return;
        }

      } catch (SftpException e) {

        sftp.mkdir(dPath);
        sftp.cd(dPath);

      }
      File file = new File(sPath);
      copyFile(sftp, file, sftp.pwd());
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      session.disconnect();
      channel.disconnect();
    }
  }

  public static void copyFile(ChannelSftp sftp, File file, String pwd) {

    if (file.isDirectory()) {
      File[] list = file.listFiles();
      try {
        try {
          String fileName = file.getName();
          sftp.cd(pwd);
          System.out.println("正在创建目录:" + sftp.pwd() + "/" + fileName);
          sftp.mkdir(fileName);
          System.out.println("目录创建成功:" + sftp.pwd() + "/" + fileName);
        } catch (Exception e) {
          // TODO: handle exception
        }
        pwd = pwd + "/" + file.getName();
        try {

          sftp.cd(file.getName());
        } catch (SftpException e) {
          // TODO: handle exception
          e.printStackTrace();
        }
      } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      }
      for (int i = 0; i < list.length; i++) {
        copyFile(sftp, list[i], pwd);
      }
    } else {

      try {
        sftp.cd(pwd);

      } catch (SftpException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
      }
      System.out.println("正在复制文件:" + file.getAbsolutePath());
      InputStream instream = null;
      OutputStream outstream = null;
      try {
        outstream = sftp.put(file.getName());
        instream = new FileInputStream(file);

        byte b[] = new byte[1024];
        int n;
        try {
          while ((n = instream.read(b)) != -1) {
            outstream.write(b, 0, n);
          }
        } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }

      } catch (SftpException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
      } finally {
        try {
          outstream.flush();
          outstream.close();
          instream.close();

        } catch (Exception e2) {
          // TODO: handle exception
          e2.printStackTrace();
        }
      }
    }
  }

}

Read the configuration file Code:

package com.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class LoadProperties {
  public static Properties getProperties() {

    File file = new File(Class.class.getClass().getResource("/").getPath()
        + "properties.properties");

    InputStream inputStream = null;

    try {
      inputStream = new FileInputStream(file);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    Properties properties = new Properties();
    try {
      properties.load(inputStream);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    return properties;

  }
}

Code directory structure:

When the test is run, the configuration file is placed in the bin directory of the project (it must be deleted when packaged into a runnable jar file. After packaging is completed, the configuration file and jar package can be placed in the same directory):

properties.properties

##

ip=
user=
pwd=
port=22
privateKeyPath=
passphrase=
sourcePath=
destinationPath=/home/dbbs/f

Package executable jar file:

Export-> ;java->Runnabe JAR file

After completion

Run java -jar on the console and export the name of the jar package.jar

The above is the implementation of sftp client in java For a detailed introduction to the function codes for uploading files and folders, please pay attention to the PHP Chinese website (www.php.cn) for more related content!