spring mvc文件上传

package com.haier.controller.newuser;

import com.haier.commons.entity.Response;
import com.haier.commons.utils.AliyunOSSUtil;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;

import java.io.File;
import java.util.UUID;
/**
 * 文件操作Controller.
 *
 * @author Will Tong
 *
 */
@Controller
@RequestMapping("/file")
public class FileController {
    private Logger log = Logger.getLogger(getClass());
    private static long PICMAXSIZE = 2097152;
    private static long FILEMAXSIZE= 10485760;//定义文件上传的最大大小为5M
    @RequestMapping(value ="/uploadfile",produces="text/plain;charset=UTF-8")
    @ResponseBody
    public String uploadFile(HttpServletRequest request, @RequestParam(required = false) MultipartFile streamFile) {
        Response<String> response=new Response<>();
        String fileName = streamFile.getOriginalFilename();
        if (!StringUtils.isEmpty(fileName)) {
            try {
                
                if (streamFile.getSize() <= FILEMAXSIZE) {
//                     String reg = ".+(.JPEG|.jpeg|.JPG|.jpg|.GIF|.gif|.BMP|.bmp|.PNG|.png)$";
//                     Pattern pattern = Pattern.compile(reg);
//                     Matcher matcher = pattern.matcher(streamFile.getOriginalFilename().toLowerCase());
                       UUID uuid = UUID.randomUUID();
                      String resultFileName = uuid.toString() + "." + this.getExtensionName(fileName);
                      File file = new File(request.getSession().getServletContext().getRealPath("/") + "temp/", resultFileName);
                      FileUtils.copyInputStreamToFile(streamFile.getInputStream(), file);
                      String uri = AliyunOSSUtil.PutObject(AliyunOSSUtil.ClassificationEnum.MECV,AliyunOSSUtil.FolderEnum.ORDER , resultFileName, file);
                      // 上传后删除
                      file.delete();
                      String url = "http://" + AliyunOSSUtil.GetBucket() + "." + AliyunOSSUtil.GetDomain() + "/" + uri;
                      response.setResult(url);
                } else {
                     response.setError("图片大小超过5M，请重新选择!");
                }
                
            } catch (Exception e) {
                log.error(String.format("图片上传失败失败"));
                response.setError("图片上传失败失败!");
            }
        }else{
            response.setError("图片名字为空无法上传!");
        }
        return response.toJson();
    }
    
    public  String getExtensionName(String filename) { 
        if ((filename != null) && (filename.length() > 0)) { 
            int dot = filename.lastIndexOf('.'); 
            if ((dot >-1) && (dot < (filename.length() - 1))) { 
                return filename.substring(dot + 1); 
            } 
        } 
        return filename; 
    } 
}