Java使用FTP上傳文件並模擬接受的方法

<!-- FTP -->
<dependency>
   <groupId>commons-net</groupId>
   <artifactId>commons-net</artifactId>
   <version>3.6</version>
 </dependency>
 <!-- Hutool:一個小而全的Java工具類庫，具體介紹參照附錄1 -->
 <dependency>
   <groupId>cn.hutool</groupId>
   <artifactId>hutool-all</artifactId>
   <version>5.3.7</version>
 </dependency>
 <!-- lombok:通過簡單的註解的形式來幫助我們簡化消除一些必須有但顯得很臃腫的 Java 代碼的工具,需要為idea添加插件，添加方法參照附錄2 -->
 <dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.16</version>    
 </dependency>

@Component
@Slf4j
public class FTPTools {

  /**
   * 文件上傳
   * @param hostname 域名地址
   * @param port 端口號
   * @param username 用戶名
   * @param password 密碼
   * @param fileInfo 待上傳的文件
   * @param uploadPath 待上傳到的路徑
   * @param saveName 預保存的文件名
   * @return
   */
  public static boolean upload(String hostname,int port,String username,String password,String fileInfo,String uploadPath,String saveName){
    boolean flag = false;

    FTPClient ftpClient = null;
    try {
      ftpClient = new FTPClient();
      ftpClient.connect(hostname,port);
      //每次數據連接之前，ftp client告訴ftp server開通一個端口來傳輸數據
      ftpClient.enterLocalPassiveMode();
      //設置二進制傳輸
      ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
      ftpClient.setControlEncoding("UTF-8");
      if(ftpClient.login(username,password)){//若連接成功
        log.info("成功登錄到ftp服務端，開始文件上傳");
        flag = sendFile(ftpClient,fileInfo,uploadPath,saveName);
      }else{
        log.error("登錄到ftp服務端失敗，請檢查用戶名和密碼");
      }
      disconnect(ftpClient);
    }catch (SocketException e) {
      log.error("文件{}上傳失敗：{}",saveName,e.getMessage());
    } catch (IOException e) {
      log.error("文件{}上傳失敗：{}",saveName,e.getMessage());
    } finally {

    }
    return flag;
  }

  /**
   * 文件傳輸
   * @param fileInfo
   * @param uploadPath
   * @param saveName
   * @return
   */
  private static boolean sendFile(FTPClient ftpClient, String fileInfo, String uploadPath, String saveName) throws FileNotFoundException,IOException{
    boolean flag = false;
    try(FileInputStream fileInputStream = new FileInputStream(fileInfo)){
      //檢查工作目錄是否存在
      if(ftpClient.changeWorkingDirectory(uploadPath)){
      	if(ftpClient.listFiles(saveName).length != 0){ //檢查文件是否已經存在
          boolean deleteFlag = ftpClient.deleteFile(saveName);
          log.info(deleteFlag?"文件已存在，直接刪除":"存在同名文件且無法刪除，請檢查權限");
        }
        flag = ftpClient.storeFile(saveName,fileInputStream);
        log.info(flag?"文件上傳成功！":"文件上傳失敗！");
      }else{
        log.error("找不到要上傳的目錄");
      }
    }catch (FileNotFoundException e){
      log.error("找不到要上傳的文件{}：{}",fileInfo,e.getMessage());
      throw e;
    }catch (IOException e){
      log.error("文件傳輸異常：{}",e.getMessage());
      throw e;
    }
    return flag;
  }

  /**
   * 斷開ftp連接
   * @param ftpClient
   */
  private static void disconnect(FTPClient ftpClient) {
    if (ftpClient.isConnected()){
      try{
        ftpClient.disconnect();
        log.info("ftp連接已關閉，文件上傳結束");
      }catch (IOException e){
        log.error("ftp連接關閉失敗:{}",e);
      }
    }
  }

}

  //ftp配置信息
  String hostname = "127.0.0.1"; //域名地址
  int port = 21; //端口號
  String username = "lmh"; //用戶名
  String password = "123456"; //密碼
  String fileInfo = "E:\\Temporary\\1.file"; //待上傳的文件目錄
  String uploadPath = "/"; //待上傳到的路徑
  String saveName = FTP+ "_" + DateUtil.format(new Date(),"yyyyMMdd"); //預保存的文件名
  FTPTools.upload(hostname, port, username, password, fileInfo, uploadPath, saveName);

SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String date = sdf.format(new Date());

String date = DateUtil.format(new Date(),"yyyyMMdd");