Java FTPUtils

加入maven依赖

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

编写FTPUtils

public class FTPUtils {

   //ftp服务器地址
   private String hostname;
   //ftp服务器端口号默认为21
   private Integer port;
   //ftp登录账号
   private String username;
   //ftp登录密码
   private String password;

   private FTPClient ftpClient = null;

   /**
    * 初始化ftp服务器
    */
   private void initFtpClient() {
       ftpClient = new FTPClient();
       ftpClient.setControlEncoding("utf-8");
       try {
           ftpClient.connect(hostname, port); //连接ftp服务器
           ftpClient.login(username, password);//登录ftp服务器
           ftpClient.getReplyCode(); //是否成功登录服务器
       } catch (MalformedURLException e) {
           e.printStackTrace();
       } catch (IOException e) {
           e.printStackTrace();
       }
   }

   /**
    * 上传文件
    *
    * @param pathname       ftp服务保存地址
    * @param fileName       上传到ftp的文件名
    * @param originfilename 待上传文件的名称（绝对地址） *
    * @return
    */
   public boolean uploadFile(String pathname, String fileName, String originfilename) {
       boolean flag = false;
       InputStream inputStream = null;
       try {
           inputStream = new FileInputStream(new File(originfilename));
           initFtpClient();
           ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
           if (!existFile(pathname)) {
               createDirecroty(pathname);
           }
           ftpClient.changeWorkingDirectory(pathname);
           flag = ftpClient.storeFile(fileName, inputStream);
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           try {
               ftpClient.logout();
           } catch (IOException e) {
               e.printStackTrace();
           }
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
           if (null != inputStream) {
               try {
                   inputStream.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return flag;
   }

   /**
    * 上传文件
    *
    * @param pathname    ftp服务保存地址
    * @param fileName    上传到ftp的文件名
    * @param inputStream 输入文件流
    * @return
    */
   public boolean uploadFile(String pathname, String fileName, InputStream inputStream) {
       boolean flag = false;
       try {
           initFtpClient();
           ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
           if (!existFile(pathname)) {
               createDirecroty(pathname);
           }
           ftpClient.changeWorkingDirectory(pathname);
           ftpClient.storeFile(fileName, inputStream);
           inputStream.close();
           ftpClient.logout();
           flag = true;
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
           if (null != inputStream) {
               try {
                   inputStream.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return true;
   }

   //改变目录路径
   public boolean changeWorkingDirectory(String directory) {
       boolean flag = true;
       try {
           flag = ftpClient.changeWorkingDirectory(directory);
           if (flag) {
               System.out.println("进入文件夹" + directory + " 成功！");

           } else {
               System.out.println("进入文件夹" + directory + " 失败！开始创建文件夹");
           }
       } catch (IOException ioe) {
           ioe.printStackTrace();
       }
       return flag;
   }

   //创建多层目录文件，如果有ftp服务器已存在该文件，则不创建，如果无，则创建
   public boolean createDirecroty(String remote) throws IOException {
       String directory = remote + "/";
       // 如果远程目录不存在，则递归创建远程服务器目录
       if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(directory)) {
           int start = 0;
           int end = 0;
           if (directory.startsWith("/")) {
               start = 1;
           }
           end = directory.indexOf("/", start);
           String path = "";
           StringBuilder paths = new StringBuilder();
           while (true) {
               String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1");
               path = path + "/" + subDirectory;
               if (!existFile(path)) {
                   if (makeDirectory(subDirectory)) {
                       changeWorkingDirectory(subDirectory);
                   } else {
                       System.out.println("创建目录[" + subDirectory + "]失败");
                       changeWorkingDirectory(subDirectory);
                   }
               } else {
                   changeWorkingDirectory(subDirectory);
               }
               paths.append("/").append(subDirectory);
               start = end + 1;
               end = directory.indexOf("/", start);
               // 检查所有目录是否创建完毕
               if (end <= start) {
                   break;
               }
           }
       }
       return true;
   }

   //判断ftp服务器文件是否存在
   public boolean existFile(String path) throws IOException {
       boolean flag = false;
       FTPFile[] ftpFileArr = ftpClient.listFiles(path);
       if (ftpFileArr.length > 0) {
           flag = true;
       }
       return flag;
   }

   //创建目录
   public boolean makeDirectory(String dir) {
       boolean flag = true;
       try {
           flag = ftpClient.makeDirectory(dir);
       } catch (Exception e) {
           e.printStackTrace();
       }
       return flag;
   }

   /**
    * 下载文件 *
    *
    * @param pathname  FTP服务器文件目录 *
    * @param filename  文件名称 *
    * @param localpath 下载后的文件路径 *
    * @return
    */
   public boolean downloadFile(String pathname, String filename, String localpath) {
       boolean flag = false;
       OutputStream os = null;
       try {
           initFtpClient();
           //切换FTP目录
           ftpClient.changeWorkingDirectory(pathname);
           FTPFile[] ftpFiles = ftpClient.listFiles();
           for (FTPFile file : ftpFiles) {
               if (filename.equalsIgnoreCase(file.getName())) {
                   File localFile = new File(localpath + "/" + file.getName());
                   os = new FileOutputStream(localFile);
                   ftpClient.retrieveFile(file.getName(), os);
                   os.close();
               }
           }
           ftpClient.logout();
           flag = true;
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
           if (null != os) {
               try {
                   os.close();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return flag;
   }

   /**
    * 删除文件 *
    *
    * @param pathname FTP服务器保存目录 *
    * @param filename 要删除的文件名称 *
    * @return
    */
   public boolean deleteFile(String pathname, String filename) {
       boolean flag = false;
       try {
           initFtpClient();
           //切换FTP目录
           ftpClient.changeWorkingDirectory(pathname);
           ftpClient.dele(filename);
           ftpClient.logout();
           flag = true;
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           if (ftpClient.isConnected()) {
               try {
                   ftpClient.disconnect();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           }
       }
       return flag;
   }
}

Java FTPUtils

Java FTPUtils

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