Spring MVC 上传文件---代码实现

package cn.kgc.updatefile;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Controller
@RequestMapping("/user")
public class UpdateFile {

    @RequestMapping("/uploadTest")
    public String uploadTest(String username, MultipartFile upload, HttpServletRequest request){
        String realPath = request.getSession().getServletContext().getRealPath("/updateTest");
        File file = new File(realPath);
        if(!file.exists()){
            file.mkdirs();
        }
        String uuidName = UUID.randomUUID().toString().replace("-", "");
        String originalFilename = upload.getOriginalFilename();
        System.out.println(originalFilename);

        String fileName=uuidName+originalFilename;
        System.out.println(fileName);

        try {
            upload.transferTo(new File(file,fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "show";
    }
}