/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    
 
http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 
 
*/
package org.apache.dolphinscheduler.api.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.net.MalformedURLException;
 
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * file utils
 */
public class FileUtils {
    private static final Logger logger = LoggerFactory.getLogger(FileUtils.class);

    /**
     * copy source file to target file
     *
     * @param file file
     * @param destFilename destination file name
     */

    public static void copyFile(MultipartFile file, String destFilename) {
        try {

            File destFile = new File(destFilename);
            File destParentDir = new File(destFile.getParent());

            if (!destParentDir.exists()) {
                org.apache.commons.io.FileUtils.forceMkdir(destParentDir);
            }

            Files.copy(file.getInputStream(), Paths.get(destFilename));
        } catch (IOException e) {
            logger.error(String.format("failed to copy file , {} is empty file", file.getOriginalFilename()), e);
        }
    }

    /**
     * copy source file to target file by file
     *
     * @param file         file
     * @param destFilename destination file name
     */
    public static void copyFileByFile(File file, String destFilename) {
        try {

            File destFile = new File(destFilename);
            File destParentDir = new File(destFile.getParent());

            if (!destParentDir.exists()) {
                org.apache.commons.io.FileUtils.forceMkdir(destParentDir);
            }
            InputStream in = new FileInputStream(file);
            Files.copy(in, Paths.get(destFilename));
        } catch (IOException e) {
            logger.error(String.format("failed to copy file , {} is empty file", file.getName()), e);
        }
    }

    /**
     * file to resource
     *
     * @param filename file name
     * @return resource
     * @throws MalformedURLException io exceptions
     */
    public static Resource file2Resource(String filename) throws MalformedURLException {
        Path file = Paths.get(filename);

        Resource resource = new UrlResource(file.toUri());
        if (resource.exists() || resource.isReadable()) {
            return resource;
        } else {
            logger.error("file can not read : {}", filename);

        }
        return null;
    }
}

檔案閱讀和上傳

package org.apache.dolphinscheduler.api.service;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import org.apache.dolphinscheduler.common.Constants;
import org.apache.dolphinscheduler.common.enums.Status;
import org.apache.dolphinscheduler.common.utils.PropertyUtils;
import org.apache.dolphinscheduler.common.utils.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

@Service
public class FileService extends BaseService {

    private static final Logger logger = LoggerFactory.getLogger(FileService.class);

    /**
     * read encrypted file context
     *
     * @return file context
     * @throws Exception exception
     */
    public Map<String, Object> readFileContent() throws Exception {
        Map<String, Object> result = new HashMap<>(5);
        String fileName = PropertyUtils.getString(Constants.LICENSE_ENCRYPTED_FILE_PATH);
        if (StringUtils.isBlank(fileName)) {
            throw new Exception("Get encrypted file path error");
        }
        File file = new File(fileName);
        BufferedReader reader = null;
        StringBuilder sb = new StringBuilder();
        try {
            reader = new BufferedReader(new FileReader(file));
            String tempStr;
            while ((tempStr = reader.readLine()) != null) {
                sb.append(tempStr).append("\n");
            }
            result.put(Constants.DATA_LIST, sb.toString());
            putMsg(result, Status.SUCCESS);
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw new Exception(e.getMessage(), e);
        } finally {
            if (reader != null) {
                reader.close();
            }
        }
        return result;
    }

    /**
     * upload file
     *
     * @return file
     * @throws Exception exception
     */
    public Map<String, Object> uploadFile(MultipartFile[] files) throws Exception {
        Map<String, Object> result = new HashMap<>(5);
        try {
            for (MultipartFile file : files) {
                String filePathName = String.format("%s/%s", PropertyUtils.getString(Constants.LICENSE_UPLOAD_FILE_PATH), file.getOriginalFilename());
                if ("license.lic".equals(file.getOriginalFilename()) || "publicCerts.keystore".equals(file.getOriginalFilename())) {
                    Files.delete(Paths.get(filePathName));
                    logger.info("delete the original file : {}", filePathName);
                }
                org.apache.dolphinscheduler.api.utils.FileUtils.copyFile(file, filePathName);
            }
//            putMsg(result, Status.SUCCESS);
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
            throw new Exception(e.getMessage(), e);
        }
        return result;
    }


}