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java 常用工具类,作为 apache-commons的补充
There is a newer version: 5.3.2302
package com.centit.support.network;

import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.net.Proxy;
@SuppressWarnings("unused")
public abstract class FtpExecutor {

    private FtpExecutor() {
        throw new IllegalAccessError("Utility class");
    }

    protected static final Logger logger = LoggerFactory.getLogger(FtpExecutor.class);
    /**
     * Description: 向FTP服务器上传文件
     * @param url FTP服务器hostname
     * @param port FTP服务器端口
     * @param username FTP登录账号
     * @param password FTP登录密码
     * @param path FTP服务器保存目录
     * @param filename 上传到FTP服务器上的文件名
     * @param input 输入流
     * @return 成功返回true，否则返回false
     */
    public static boolean uploadFile(String url,int port,String username,
            String password, String path, String filename, InputStream input) {
        return uploadFile( url, port, username, null,
                 password,  path,  filename,  input);
    }

    public static boolean uploadFile(String url,int port,String username,
            Proxy proxy,
            String password, String path, String filename, InputStream input) {
        boolean success = false;
        FTPClient ftp = new FTPClient();
        try {
            int reply;
            if(proxy!=null)
                ftp.setProxy(proxy);
            ftp.connect(url, port);//连接FTP服务器
            //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
            ftp.login(username, password);//登录
            reply = ftp.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                return success;
            }
            ftp.changeWorkingDirectory(path);
            ftp.storeFile(filename, input);
            ftp.logout();
            success = true;
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException ioe) {
                    logger.error(ioe.getMessage(),ioe);//ioe.printStackTrace();
                }
            }
        }
        return success;
    }

    /**
    * Description: 从FTP服务器下载文件
    * @param url FTP服务器hostname
    * @param port FTP服务器端口
    * @param username FTP登录账号
    * @param password FTP登录密码
    * @param remotePath FTP服务器上的相对路径
    * @param fileName 要下载的文件名
    * @param localPath 下载后保存到本地的路径
    * @return 是否成功
    */
    public static boolean downloadFile(String url, int port,String username, String password,
            String remotePath,String fileName,String localPath) {
        return downloadFile( url,  port, username,  password, null,
             remotePath, fileName, localPath);
    }
    public static boolean downloadFile(String url, int port,String username, String password,
            Proxy proxy,
            String remotePath,String fileName,String localPath) {
        boolean success = false;
        FTPClient ftp = new FTPClient();
        try {
            int reply;
            if(proxy!=null)
                ftp.setProxy(proxy);
            ftp.connect(url, port);
            //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
            ftp.login(username, password);//登录
            reply = ftp.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                return success;
            }
            ftp.changeWorkingDirectory(remotePath);//转移到FTP服务器目录
            FTPFile[] fs = ftp.listFiles();
            for(FTPFile ff:fs){
                if(ff.getName().equals(fileName)){
                    File localFile = new File(localPath+"/"+ff.getName());
                    try(OutputStream is = new FileOutputStream(localFile)){
                        ftp.retrieveFile(ff.getName(), is);
                    }
                    //is.close();
                }
            }

            ftp.logout();
            success = true;
        } catch (IOException e) {
            logger.error(e.getMessage(),e);//e.printStackTrace();
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException ioe) {
                    logger.error(ioe.getMessage(),ioe);//ioe.printStackTrace();
                }
            }
        }
        return success;
    }
}