Java利用apache ftp工具实现文件上传下载和删除功能

利用apache ftp工具实现文件的上传下载和删除，具体如下

1、下载相应的jar包

commons-net-1.4.1.jar

2、实现代码如下：

public class FtpUtils {
    //ftp服务器地址
    public String hostname = "192.168.1.249";
    //ftp服务器端口号默认为21
    public Integer port = 21 ;
    //ftp登录账号
    public String username = "root";
    //ftp登录密码
    public String password = "123"; 

    public FTPClient ftpClient = null; 

    /**
     * 初始化ftp服务器
     */
    public void initFtpClient() {
      ftpClient = new FTPClient();
      ftpClient.setControlEncoding("utf-8");
      try {
        System.out.println("connecting...ftp服务器:"+this.hostname+":"+this.port);
        ftpClient.connect(hostname, port); //连接ftp服务器
        ftpClient.login(username, password); //登录ftp服务器
        int replyCode = ftpClient.getReplyCode(); //是否成功登录服务器
        if(!FTPReply.isPositiveCompletion(replyCode)){
          System.out.println("connect failed...ftp服务器:"+this.hostname+":"+this.port);
        }
        System.out.println("connect successfu...ftp服务器:"+this.hostname+":"+this.port);
      }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{
        System.out.println("开始上传文件");
        inputStream = new FileInputStream(new File(originfilename));
        initFtpClient();
        ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);
        CreateDirecroty(pathname);
        ftpClient.makeDirectory(pathname);
        ftpClient.changeWorkingDirectory(pathname);
        ftpClient.storeFile(fileName, inputStream);
        inputStream.close();
        ftpClient.logout();
        flag = true;
        System.out.println("上传文件成功");
      }catch (Exception e) {
        System.out.println("上传文件失败");
        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;
    }
    /**
     * 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{
        System.out.println("开始上传文件");
        initFtpClient();
        ftpClient.setFileType(ftpClient.BINARY_FILE_TYPE);
        CreateDirecroty(pathname);
        ftpClient.makeDirectory(pathname);
        ftpClient.changeWorkingDirectory(pathname);
        ftpClient.storeFile(fileName, inputStream);
        inputStream.close();
        ftpClient.logout();
        flag = true;
        System.out.println("上传文件成功");
      }catch (Exception e) {
        System.out.println("上传文件失败");
        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 {
      boolean success = true;
      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(new String(directory))) {
        int start = 0;
        int end = 0;
        if (directory.startsWith("/")) {
          start = 1;
        } else {
          start = 0;
        }
        end = directory.indexOf("/", start);
        String path = "";
        String paths = "";
        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 = paths + "/" + 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 success;
    } 

   //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);
        if (flag) {
          System.out.println("创建文件夹" + dir + " 成功！"); 

        } else {
          System.out.println("创建文件夹" + dir + " 失败！");
        }
      } 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 {
        System.out.println("开始下载文件");
        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;
        System.out.println("下载文件成功");
      } catch (Exception e) {
        System.out.println("下载文件失败");
        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 {
        System.out.println("开始删除文件");
        initFtpClient();
        //切换FTP目录
        ftpClient.changeWorkingDirectory(pathname);
        ftpClient.dele(filename);
        ftpClient.logout();
        flag = true;
        System.out.println("删除文件成功");
      } catch (Exception e) {
        System.out.println("删除文件失败");
        e.printStackTrace();
      } finally {
        if(ftpClient.isConnected()){
          try{
            ftpClient.disconnect();
          }catch(IOException e){
            e.printStackTrace();
          }
        }
      }
      return flag;
    } 

    public static void main(String[] args) {
      FtpUtils ftp =new FtpUtils();
      //ftp.uploadFile("ftpFile/data", "123.docx", "E://123.docx");
      //ftp.downloadFile("ftpFile/data", "123.docx", "F://");
      ftp.deleteFile("ftpFile/data", "123.docx");
      System.out.println("ok");
    }
} 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。