FTPUtil工具类

配置maven

 <dependency>
            <groupId>commons-net</groupId>
            <artifactId>commons-net</artifactId>
            <version>3.6</version>
  </dependency>

工具类

package com.hk.utils;


import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


/**
 * User: hk
 * Date: 2017/8/10 下午4:31
 * version: 1.0
 */
public class FTPUtil implements AutoCloseable {

    private FTPClient ftpClient;


    public FTPUtil(String serverIP, int port, String userName, String password) throws IOException {
        ftpClient = new FTPClient();
        ftpClient.connect(serverIP, port);
        ftpClient.login(userName, password);
        ftpClient.setBufferSize(1024);//设置上传缓存大小
        ftpClient.setControlEncoding("UTF-8");//设置编码
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);//设置文件类型
    }

    /**
     * 下载ftp文件到本地
     *
     * @param remoteFileName 远程文件名称
     * @param localFile      本地文件[包含路径]
     * @return true/false
     * @throws IOException 异常
     */
    public boolean downloadFile(String remoteFileName, String localFile) throws IOException {
        boolean isSucc;
        File outFileName = new File(localFile);
        if (ftpClient == null)
            throw new IOException("ftp server not login");
        try (OutputStream outputStream = new FileOutputStream(outFileName)) {
            isSucc = ftpClient.retrieveFile(remoteFileName, outputStream);
        }
        return isSucc;
    }

    /**
     * 上传文件制定目录
     *
     * @param remoteFileName 远程文件名
     * @param localFile      本地文件[必须带路径]
     * @return true/false
     * @throws IOException 异常
     */
    public boolean uploadFile(String remoteFileName, String localFile) throws IOException {
        boolean isSucc;
        try (InputStream inputStream = new FileInputStream(localFile)) {
            if (ftpClient == null)
                throw new IOException("ftp server not login");
            isSucc = ftpClient.storeFile(remoteFileName, inputStream);
        }
        return isSucc;
    }

    /**
     * 切换目录
     *
     * @param path 创建目录
     * @return 创建标志
     * @throws IOException 异常
     */
    public boolean changeDirectory(String path) throws IOException {
        return ftpClient.changeWorkingDirectory(path);
    }

    /**
     * 创建目录
     *
     * @param path 创建目录
     * @return 创建标志
     * @throws IOException 异常
     */
    public boolean createDirectory(String path) throws IOException {
        return ftpClient.makeDirectory(path);
    }


    /**
     * 自动关闭资源
     */
    @Override
    public void close() throws Exception {
        if (ftpClient != null && ftpClient.isConnected()) {
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }
}

使用方式

@Test
    public void downloadFile() throws Exception {
        try (FTPUtil ftpUtil = new FTPUtil("10.211.55.7",21,"ftpuser","123qwe")){
            ftpUtil.downloadFile("2.txt","/Users/hk/Desktop/22.txt");
        }catch (Exception e){
            e.printStackTrace();
        }
    }

    @Test
    public void uploadFile() throws Exception {
        try (FTPUtil ftpUtil = new FTPUtil("10.211.55.6",21,"ftpuser","123qwe")){
            ftpUtil.uploadFile("2.txt","/Users/hk/Desktop/副本.txt");
        }catch (Exception e){
            e.printStackTrace();
        }


    }