• 工具类文件上传工具类


    package com.jyc.common.utils.file;

    import java.io.File;
    import java.io.IOException;

    import com.jyc.common.exception.file.FileNameLengthLimitExceededException;
    import com.jyc.common.exception.file.FileSizeLimitExceededException;
    import com.jyc.common.exception.file.InvalidExtensionException;
    import com.jyc.common.utils.DateUtils;
    import com.jyc.common.utils.StringUtils;
    import org.apache.commons.io.FilenameUtils;
    import org.springframework.web.multipart.MultipartFile;
    import com.jyc.common.config.RuoYiConfig;
    import com.jyc.common.constant.Constants;
    import com.jyc.common.utils.uuid.IdUtils;

    /**
    * 文件上传工具类
    *
    * @author jianyongchao
    */
    public class FileUploadUtils
    {
    /**
    * 默认大小 50M
    */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
    * 默认的文件名最大长度 100
    */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
    * 默认上传的地址
    */
    private static String defaultBaseDir = RuoYiConfig.getProfile();

    public static void setDefaultBaseDir(String defaultBaseDir)
    {
    FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    public static String getDefaultBaseDir()
    {
    return defaultBaseDir;
    }

    /**
    * 以默认配置进行文件上传
    *
    * @param file 上传的文件
    * @return 文件名称
    * @throws Exception
    */
    public static final String upload(MultipartFile file) throws IOException
    {
    try
    {
    return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
    }
    catch (Exception e)
    {
    throw new IOException(e.getMessage(), e);
    }
    }

    /**
    * 根据文件路径上传
    *
    * @param baseDir 相对应用的基目录
    * @param file 上传的文件
    * @return 文件名称
    * @throws IOException
    */
    public static final String upload(String baseDir, MultipartFile file) throws IOException
    {
    try
    {
    return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
    }
    catch (Exception e)
    {
    throw new IOException(e.getMessage(), e);
    }
    }

    /**
    * 文件上传
    *
    * @param baseDir 相对应用的基目录
    * @param file 上传的文件
    * @param allowedExtension 上传文件类型
    * @return 返回上传成功的文件名
    * @throws FileSizeLimitExceededException 如果超出最大大小
    * @throws FileNameLengthLimitExceededException 文件名太长
    * @throws IOException 比如读写文件出错时
    * @throws InvalidExtensionException 文件校验异常
    */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
    throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
    InvalidExtensionException
    {
    int fileNamelength = file.getOriginalFilename().length();
    if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH)
    {
    throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
    }

    assertAllowed(file, allowedExtension);

    String fileName = extractFilename(file);

    File desc = getAbsoluteFile(baseDir, fileName);
    file.transferTo(desc);
    String pathFileName = getPathFileName(baseDir, fileName);
    return pathFileName;
    }

    /**
    * 编码文件名
    */
    public static final String extractFilename(MultipartFile file)
    {
    String fileName = file.getOriginalFilename();
    String extension = getExtension(file);
    fileName = DateUtils.datePath() + "/" + IdUtils.fastUUID() + "." + extension;
    return fileName;
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
    File desc = new File(uploadDir + File.separator + fileName);

    if (!desc.exists())
    {
    if (!desc.getParentFile().exists())
    {
    desc.getParentFile().mkdirs();
    }
    }
    return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException
    {
    int dirLastIndex = RuoYiConfig.getProfile().length() + 1;
    String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
    String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
    return pathFileName;
    }

    /**
    * 文件大小校验
    *
    * @param file 上传的文件
    * @return
    * @throws FileSizeLimitExceededException 如果超出最大大小
    * @throws InvalidExtensionException
    */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
    throws FileSizeLimitExceededException, InvalidExtensionException
    {
    long size = file.getSize();
    if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE)
    {
    throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
    }

    String fileName = file.getOriginalFilename();
    String extension = getExtension(file);
    if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
    {
    if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
    {
    throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
    fileName);
    }
    else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
    {
    throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
    fileName);
    }
    else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
    {
    throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
    fileName);
    }
    else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION)
    {
    throw new InvalidExtensionException.InvalidVideoExtensionException(allowedExtension, extension,
    fileName);
    }
    else
    {
    throw new InvalidExtensionException(allowedExtension, extension, fileName);
    }
    }

    }

    /**
    * 判断MIME类型是否是允许的MIME类型
    *
    * @param extension
    * @param allowedExtension
    * @return
    */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
    for (String str : allowedExtension)
    {
    if (str.equalsIgnoreCase(extension))
    {
    return true;
    }
    }
    return false;
    }

    /**
    * 获取文件名的后缀
    *
    * @param file 表单文件
    * @return 后缀名
    */
    public static final String getExtension(MultipartFile file)
    {
    String extension = FilenameUtils.getExtension(file.getOriginalFilename());
    if (StringUtils.isEmpty(extension))
    {
    extension = MimeTypeUtils.getExtension(file.getContentType());
    }
    return extension;
    }
    }
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  • 原文地址:https://www.cnblogs.com/qq3245792286/p/15469656.html
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