java后台图片上传接口

package com.citadel.fingerling.module.common.util;

import com.citadel.fingerling.module.common.exception.ServiceException;
import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import static jxl.biff.BaseCellFeatures.logger;

/**
 * 图片文件上传接口
 * 入参-文件（file）
 * 出参-文件上传后的存储位置（targetContextPath）
 *
 * @author timothy_yuan.
 */
@Component
public class UploadUtil {

    @Value("${fingerling.upload.image.base.path}")
    private String uploadPath;

    @Value("${fingerling.upload.image.context.path}")
    private String contextPath;

    @Value("${upload.image.valid.suffixes}")
    private String validSuffix;


    public String upload(MultipartFile file) throws ServiceException {

        //获取文件名称；
        String name = file.getOriginalFilename();

        //获取当前时间作为最终存储文件的上级目录；
        SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
        String today = format.format(new Date());

        //保存的文件名：时间戳+六位随机数+文件后缀；
        String fileName = RandomUtils.getRandomId() + RandomUtils.generateCode() + getFileSuffix(name);

        //文件类型校验；
        String type = getFileSuffix(name);
        if (!validSuffix.contains(type)) {
            logger.error("UploadFile failed for suffix error;error sufiix:" + type);
            throw new ServiceException("M2-000001");
        }

        //文件最终上传地址；
        String uploadFolder = uploadPath + File.separator + today;

        //上传文件；
        File dir = new File(uploadFolder);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        String targetUploadPath = dir + File.separator + fileName;
        String targetContextPath = contextPath + File.separator + today + File.separator + fileName;
        try {
            FileUtils.writeByteArrayToFile(new File(targetUploadPath), file.getBytes());
        } catch (IOException e) {
            logger.error("UploadFile failed", e);
            throw new ServiceException("M2-000002");
        }
        //返回文件存储位置；
        return targetContextPath;
    }

    public static String getFileSuffix(String name) {
        return name.substring(name.lastIndexOf("."), name.length());
    }
}