ftp上传下载删除

导入依赖

	<!--FtpClient所在的包-->
    <dependency>
        <groupId>commons-net</groupId>
        <artifactId>commons-net</artifactId>
        <version>3.6</version>
    </dependency>
    <!--日志-->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.2</version>
    </dependency>
    <!--单元测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.1</version>
        <scope>test</scope>
    </dependency>

ftp对象创建

    /**
     * ftp对象
     * @param ip 地址
     * @param userName 用户名
     * @param password 密码
     * @return
     * @throws IOException
     */
    public static FTPClient getFtp(String ip,String userName,String password) throws IOException {
        FTPClient ftpClient = new FTPClient();
        ftpClient.connect(ip,21);
        ftpClient.login(userName,password);
        return ftpClient;
    }

ftp上传文件

     /**
    * 上传ftp
    * @param ftpClient ftp对象
    * @param path 定位到的ftp的目录
    * @param in 上传的流
    * @throws IOException
    */
   private static void uploadFile(FTPClient ftpClient, String path, InputStream in) throws IOException {
       int replyCode = ftpClient.getReplyCode();
       ftpClient.setDataTimeout(120000);
       //设置为二进制文件
       ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

       if (!FTPReply.isPositiveCompletion(replyCode)) {
           ftpClient.disconnect();
           System.out.println("FTP连接失败");
       }else {
           System.out.println("FTP连接成功");
       }


       boolean changeWorkingDirectory = ftpClient.changeWorkingDirectory(path);
       //文件夹切换失败，则创建文件夹
       if(!changeWorkingDirectory){
           String[] split = path.split("/");
           for (String s : split) {
               if (ftpClient.changeWorkingDirectory(s)) {
                   continue;
               }
               boolean makeDirectory = ftpClient.makeDirectory(s);
               if (makeDirectory) {
                   boolean b = ftpClient.changeWorkingDirectory(s);
                   if(!b){
                       throw new RuntimeException("切换目录失败");
                   }
               }
           }
       }

       String removePath = new String("Servlet_12.png".getBytes("UTF-8"),"iso-8859-1");

       //上传
       ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
       if(ftpClient.storeFile(removePath, in)){
           System.out.println("文件上传成功");
       }else{
           System.out.println("文件上传失败");
       }
       //关闭文件流
       in.close();
       //关闭连接
       if (ftpClient != null) {
           ftpClient.logout();
           ftpClient.disconnect();
       }
   }

ftp下载文件

     /**
    * 下载ftp
    * @param ftpClient ftp对象
    * @param filePath ftp上的文件夹路径
    * @param fileName ftp上文件的路径
    * @throws IOException
    */
   public static void downFtp(FTPClient ftpClient,String filePath,String fileName) throws IOException {
       //定位到ftp目录
       ftpClient.changeWorkingDirectory(filePath);
       FTPFile[] ftpFiles = ftpClient.listFiles();
       for (FTPFile ftpFile : ftpFiles) {
           byte[] bytes = ftpFile.getName().getBytes("iso-8859-1");
           String str = new String(bytes,"UTF-8");
           if(str.equals(fileName)){
               OutputStream outputStream = new FileOutputStream("C:\\Users\\泽\\Desktop\\新建文本文档.png");
               ftpClient.retrieveFile(ftpFile.getName(),outputStream);
               outputStream.close();
           }
       }
       //断开ftp
       ftpClient.disconnect();
   }

ftp删除文件

 /**
     * 删除文件
     * @param ftpClient ftp对象
     * @param path 文件在ftp上的路径
     * @param fileName 文件名称
     * @throws IOException
     */
    public static void deleteFtp(FTPClient ftpClient,String path,String fileName) throws IOException {
        ftpClient.changeWorkingDirectory(path);
        ftpClient.deleteFile( fileName);
    }

测试

 public static void main(String[] args) {
        try {
            FTPClient ftpClient = getFtp("192.168.56.1","anonymous","");
            InputStream inputStream = new FileInputStream("D:/Servlet_12.png");
//            uploadFile(ftpClient,"/test",inputStream);
//            downFtp(ftpClient,"/test","Servlet_12.png");
            deleteFtp(ftpClient,"/test","Servlet_12.png");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }


    }