layui上传图片、文本、视频工具类

学习layui 上传时候偶遇的上传图片、文本、视频工具类，亲测有效，在此感谢作者。@wangpeihua https://www.cnblogs.com/wangpeihua/p/9525521.html

package com.xw.util;

import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.*;

/**

• 文件上传
  */
  public class KitFileUtil {

  private static ServletContext servletContext;

  public Map<String,Object> kitFileUtil(@RequestParam(“imgFile”) MultipartFile[] imgFile, HttpServletRequest request, HttpServletResponse response){

   // 文件保存目录路径
   String savePath = request.getSession().getServletContext().getRealPath("")  + "/"+ StaticFinalVar.IMG_FILES;
   System.out.println("正确路径："+savePath);
  
   //文件保存目录URL
   String saveUrl  = request.getContextPath() +  "/"+ StaticFinalVar.IMG_FILES;
  
   //定义允许上传的文件扩展名
   HashMap<String, String> extMap = new HashMap<String, String>();
   extMap.put("image", "gif,jpg,jpeg,png,bmp");
   extMap.put("flash", "swf,flv");
   extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb,mp4");
   extMap.put("file", "doc,docx,xls,xlsx,ppt,txt,zip,rar,gz,bz2");
  
   //最大文件大小
   long maxSize = 9000000;
  
   response.setContentType("text/html; charset=UTF-8");
  
   if(!ServletFileUpload.isMultipartContent(request)){
       return getError("请选择文件。");
   }
   //检查目录
   File uploadDir = new File(savePath);
   if(!uploadDir.exists()){
       uploadDir.mkdir();
  

// return getError(“上传目录不存在。”);
}

    //检查目录写权限
    if(!uploadDir.canWrite()){
        return getError("上传目录没有写权限。");
    }

    String dirName = request.getParameter("dir");
    if (dirName == null) {
        dirName = "image";
    }
    if(!extMap.containsKey(dirName)){
        return getError("目录名不正确。");
    }

    //创建文件夹
    savePath += dirName + "/";
    saveUrl += dirName + "/";
    File saveDirFile = new File(savePath);
    if (!saveDirFile.exists()) {
        saveDirFile.mkdirs();
    }
    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
    String ymd = sdf.format(new Date());
    savePath += ymd + "/";
    saveUrl += ymd + "/";
    File dirFile = new File(savePath);
    if (!dirFile.exists()) {
        dirFile.mkdirs();
    }
    String url[] = new String[imgFile.length];
    Map<String,Object> map = new HashMap<String, Object>();
    for (int i=0;i<imgFile.length;i++) {
        System.out.println(imgFile[i]);

        // 获取上传文件的名字
        String fileName = imgFile[i].getOriginalFilename();
        // 获取长度
        long fileSize = imgFile[i].getSize();

        if(!imgFile[i].isEmpty()){

            // 检查文件大小
            if(imgFile[i].getSize() > maxSize){
                return getError("上传文件大小超过限制。");
            }

            // 检查扩展名
            String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
            if(!Arrays.<String>asList(extMap.get(dirName).split(",")).contains(fileExt)){
                return getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。");
            }

            SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
            String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
            try{
                // 保存文件
                System.out.println(saveUrl + newFileName);
                FileCopyUtils.copy(imgFile[i].getInputStream(), new FileOutputStream(savePath + newFileName));

            }catch(Exception e){
                return getError("上传文件失败。");
            }



            url[i] = saveUrl + newFileName;

// map.put(“error”, 0);
// map.put(“url”, saveUrl + newFileName);
// return map;
}
}
map.put(“error”, 0);
map.put(“url”, url);
return map;
// return getError(“服务器端错误。”);
}

private Map<String,Object> getError(String message) {
    Map<String,Object> map = new HashMap<String, Object>();

//
map.put(“error”, 101);
map.put(“message”, message);
return map;
}

}