用java写一段具有注释的代码，能够将本地文件上传到linux服务器

下面是一段用Java实现的将本地文件上传到Linux服务器的代码，注释已经添加在代码中：

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class FileUploader {
    
    public static void main(String[] args) {
        // 读取配置文件
        Properties props = new Properties();
        try {
            props.load(new FileInputStream("config.properties"));
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 连接SSH服务器
        JSch jsch = new JSch();
        Session session = null;
        try {
            session = jsch.getSession(props.getProperty("username"), props.getProperty("host"), Integer.parseInt(props.getProperty("port")));
            session.setConfig("StrictHostKeyChecking", "no");
            session.setPassword(props.getProperty("password"));
            session.connect();
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 上传文件
        Channel channel = null;
        InputStream in = null;
        try {
            channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand("mkdir -p " + props.getProperty("remotePath"));
            channel.connect();
            channel.disconnect();
            channel = session.openChannel("sftp");
            channel.connect();
            ((ChannelExec) channel).setCommand("put " + props.getProperty("localFile") + " " + props.getProperty("remotePath"));
            in = channel.getInputStream();
            channel.connect();
            byte[] tmp = new byte[1024];
            while (true) {
                while (in.available() > 0) {
                    int i = in.read(tmp, 0, 1024);
                    if (i < 0)
                        break;
                    System.out.print(new String(tmp, 0, i));
                }
                if (channel.isClosed()) {
                    if (in.available() > 0)
                        continue;
                    System.out.println("upload file success!");
                    break;
                }
                try {
                    Thread.sleep(1000);
                } catch (Exception ee) {
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                in.close();
            } catch (Exception e) {
            }
            channel.disconnect();
            session.disconnect();
        }
    }
}

这段代码通过使用JSch库实现了SSH连接和SFTP上传文件的功能，其中需要在配置文件中指定用户名、密码、主机名、端口号、本地文件路径和远程服务器文件路径等参数。