Java Enum

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Enum

Enum is a special class that represents a group of constants.

1.define enum
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package com.exp.enums;

import java.util.Arrays;
import java.util.List;

public enum ContentTypeEnum {

    WORD_FILE_TYPE("word", new String[]{"application/msword", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"}),

    EXCEL_FILE_TYPE("excel", new String[]{"application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"}),

    PPT_FILE_TYPE("ppt", new String[]{"application/vnd.ms-powerpoint", "application/vnd.openxmlformats-officedocument.presentationml.presentation"}),

    IMAGE_FILE_TYPE("jpg", new String[]{"image/jpeg", "image/gif", "image/png", "image/bmp"}),

    PDF_FILE_TYPE("pdf", new String[]{"application/pdf"});

    private String fileType;

    private List<String> mimeTypeList;

    ContentTypeEnum(String fileType, String[] mimeTypeList) {
        this.fileType = fileType;
        this.mimeTypeList = Arrays.asList(mimeTypeList);
    }

    public String getFileType() {
        return fileType;
    }

    public void setFileType(String fileType) {
        this.fileType = fileType;
    }

    public List<String> getMimeTypeList() {
        return mimeTypeList;
    }

    public void setMimeTypeList(List<String> mimeTypeList) {
        this.mimeTypeList = mimeTypeList;
    }

}
2.Case

Check the uploaded file type, the uploaded file must be a picture or PDF.

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// MultipartFile multipartFile
String contentType = multipartFile.getContentType();
List<String> pdfFileType = ContentTypeEnum.PDF_FILE_TYPE.getMimeTypeList();
List<String> imageFileType = ContentTypeEnum.IMAGE_FILE_TYPE.getMimeTypeList();
if (!pdfFileType.contains(contentType) && !imageFileType.contains(contentType)) {
    return "The uploaded file only can be a picture or PDF.";
}