java多文件上传主要代码

上传文件方法代码

类R为自定义的返回数据包装对象，不是重要部分

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@RequestMapping("/uploadImg")
public R uploadImg(@RequestParam("img") MultipartFile[] files, HttpServletRequest request) {
    Map<String, Object> result = new HashMap<>();
    if(files.length<=0){
        return R.error("请选择图片");
    }
    String uploadPath = System.getProperty("user.dir") + "/files/";
    try {
        List<String> urls=new ArrayList<>();
        for(MultipartFile file:files){
            if (file.isEmpty()) {
               continue;
            }
            String fileName = file.getOriginalFilename();
            fileName = FileUtil.renameToUUID(fileName);
            try {
                FileUtil.uploadFile(file.getBytes(), uploadPath, fileName);
            } catch (Exception e) {
                e.printStackTrace();
            }
            urls.add("/files/" + fileName);
        }
        result.put("urls", urls);
    } catch (Exception e) {
        return R.error("上传图片失败！");
    }

    if (result != null && result.size() > 0) {
        return R.ok(result);
    } else {
        return R.error("上传图片失败！");
    }
}

类FileUtil代码

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package com.app.common.utils;

import java.io.File;
import java.io.FileOutputStream;
import java.util.UUID;

public class FileUtil {

	public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception {
		File targetFile = new File(filePath);
		if (!targetFile.exists()) {
			targetFile.mkdirs();
		}
		FileOutputStream out = new FileOutputStream(filePath + fileName);
		out.write(file);
		out.flush();
		out.close();
	}

	public static boolean deleteFile(String fileName) {
		File file = new File(fileName);
		// 如果文件路径所对应的文件存在，并且是一个文件，则直接删除
		if (file.exists() && file.isFile()) {
			if (file.delete()) {
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	}

	public static String renameToUUID(String fileName) {
		return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1);
	}
}