JAVA实现FTP文件上传下载

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JAVA实现FTP文件上传下载

• 首先在pom文件中添加FTP相关依赖jar坐标:

  		<dependency>
  			<groupId>commons-net</groupId>
  			<artifactId>commons-net</artifactId>
  			<version>3.3</version>
  		</dependency>
  

• 创建FtpUtil工具类

  • 连接FTP,并获取FTPClient对象方法

   /**
       * 获取FTPClient对象
       *
       * @param ftpHost     FTP主机服务器
       * @param ftpPassword FTP 登录密码
       * @param ftpUserName FTP登录用户名
       * @param ftpPort     FTP端口 默认为21
       * @return
       */
      public FTPClient getFTPClient(String ftpHost, String ftpUserName,
                                           String ftpPassword, int ftpPort) {
          FTPClient ftpClient = new FTPClient();
          try {
              ftpClient = new FTPClient();
              ftpClient.connect(ftpHost, ftpPort);// 连接FTP服务器
              ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器
              if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
                  System.out.println("未连接到FTP，用户名或密码错误。");
                  ftpClient.disconnect();
              } else {
                  System.out.println("FTP连接成功。");
              }
          } catch (SocketException e) {
              e.printStackTrace();
              System.out.println("FTP的IP地址可能错误，请正确配置。");
          } catch (IOException e) {
              e.printStackTrace();
              System.out.println("FTP的端口错误,请正确配置。");
          }
          return ftpClient;
      }
  

  • 向FTP服务器上传文件方法

  /**
       * Description: 向FTP服务器上传文件
       * @param ftpHost FTP服务器hostname
       * @param ftpUserName 账号
       * @param ftpPassword 密码
       * @param ftpPort 端口
       * @param ftpPath  FTP服务器中文件所在路径 格式： ftptest/aa
       * @param fileName ftp文件名称
       * @param input 文件流
       * @return 成功返回true，否则返回false
       */
      public  boolean uploadFile(String ftpHost, String ftpUserName,
                                       String ftpPassword, int ftpPort, String ftpPath,
                                       String fileName,InputStream input,FTPClient ftpClient) {
          boolean success = false;
          //FTPClient ftpClient = null;
          try {
              int reply;
              //ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
              reply = ftpClient.getReplyCode();
              if (!FTPReply.isPositiveCompletion(reply)) {
                  ftpClient.disconnect();
                  return success;
              }
              ftpClient.setControlEncoding("UTF-8"); // 中文支持
              ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
              ftpClient.enterLocalPassiveMode();
              ftpClient.changeWorkingDirectory(ftpPath);
  
              ftpClient.storeFile(fileName, input);
  
              input.close();
              ftpClient.logout();
              success = true;
          } catch (IOException e) {
              e.printStackTrace();
          } finally {
              if (ftpClient.isConnected()) {
                  try {
                      ftpClient.disconnect();
                  } catch (IOException ioe) {
                  }
              }
          }
          return success;
      }
  

  • 从FTP服务器下载文件方法

  /**
       * 从FTP服务器下载文件
       *
       * @param ftpHost FTP IP地址
       * @param ftpUserName FTP 用户名
       * @param ftpPassword FTP用户名密码
       * @param ftpPort FTP端口
       * @param ftpPath FTP服务器中文件所在路径 格式： ftptest/aa
       * @param localPath 下载到本地的位置 格式：H:/download
       * @param fileName 文件名称
       */
      public  void downloadFtpFile(String ftpHost, String ftpUserName, String ftpPassword, int ftpPort, String ftpPath, String localPath, String fileName,FTPClient ftpClient) {
  
          //FTPClient ftpClient = null;
  
          try {
              ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
              ftpClient.setControlEncoding("UTF-8"); // 中文支持
              ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
              ftpClient.enterLocalPassiveMode();
              ftpClient.changeWorkingDirectory(ftpPath);
  
              File localFile = new File(localPath + File.separatorChar + fileName);
              OutputStream os = new FileOutputStream(localFile);
              ftpClient.retrieveFile(fileName, os);
              os.close();
              ftpClient.logout();
  
          } catch (FileNotFoundException e) {
              System.out.println("没有找到" + ftpPath + "文件");
              e.printStackTrace();
          } catch (SocketException e) {
              System.out.println("连接FTP失败.");
              e.printStackTrace();
          } catch (IOException e) {
              e.printStackTrace();
              System.out.println("文件读取错误。");
              e.printStackTrace();
          }
  
      }
  

• 测试类

  @RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration("classpath:applicationContext.xml")
  public class Demo3 {
     String ftpHost = "192.168.29.1xx";
      String ftpUserName = "ccc";
      String ftpPassword = "root";
      int ftpPort = 21;
      String ftpPath = "test2/demo01.xlsx";
      String localPath = "D:\\test\\test.txt";
      String fileName = "demo01.txt";
  
      FtpUtil ftpUtil = new FtpUtil();
  
      FTPClient ftpClient = ftpUtil.getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
      @Test
      public  void test01(){
          //上传一个文件
          try{
              FileInputStream in=new FileInputStream(new File(localPath));
              boolean test = ftpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,in,ftpClient);
              if (test){
                  System.out.println("上传成功");
              }else{
                  System.out.println("上传失败");
              }
          } catch (FileNotFoundException e){
              e.printStackTrace();
              System.out.println(e);
          }
      }
  
      @Test
      public void test02(){
          //下载一个文件
          ftpUtil.downloadFtpFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, localPath, fileName,ftpClient);
      }
        public void test03(){
  		    //在FTP服务器上生成一个文件，并将一个字符串写入到该文件中
  	        try {
  	            InputStream input = new ByteArrayInputStream("test ftp jyf".getBytes("GBK"));
  	            boolean flag = ftpUtil.uploadFile(ftpHost, ftpUserName, ftpPassword, ftpPort, ftpPath, fileName,input,ftpClient);
  	            System.out.println(flag);
  	        } catch (UnsupportedEncodingException e) {
  	            e.printStackTrace();
     		 }
      }
  	
  

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