springmvc+layui实现多文件上传及进度条提示

package com.it.multifileupload; import java.io.File; import java.io.IOException; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.multipart.commons.CommonsMultipartResolver; @Controller public class MultiFileUploadController { @RequestMapping(value="/multiFileUpload",method=RequestMethod.POST) @ResponseBody public Map<String,Object> multiFileUpload(HttpServletRequest request) throws IllegalStateException, IOException{ System.out.println("=============开始上传==============="); //创建map封装需要的返回值，前端通过done函数的res获取该值 Map<String,Object> map=new HashMap<>(); CommonsMultipartResolver multipartResolver=new CommonsMultipartResolver( request.getSession().getServletContext()); //检查form中是否有enctype="multipart/form-data" if(multipartResolver.isMultipart(request)){ //将request变成多部分request MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request; //获取multiRequest 中所有的文件名 Iterator iter=multiRequest.getFileNames(); //遍历获取多文件 while(iter.hasNext()){ //获取文件 MultipartFile file=multiRequest.getFile(iter.next().toString()); System.out.println(file.getOriginalFilename()); if(file!=null){ //设置文件上传的路径 和名称。 String path="C://upload//"+file.getOriginalFilename(); //通过transferTo实现文件上传 file.transferTo(new File(path)); } } } //案例没有具体业务，就给了一个code值为200表示成功 //layui如果检测不到返回的code值，上传文件会成功，但是前端会报错。 map.put("code", 200); return map; } }