springmvc异步上传文件

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@Controller
@RequestMapping("/order")
public class OrderController {
 @RequestMapping("/refund")
    public void refund(@RequestParam("transId")String transId,@RequestParam("uin") String uin,
    HttpServletRequest request, HttpServletResponse response,
    @RequestParam(value = "file",required = false)MultipartFile file) {
        
        
        
        
        
        
        
    }
}

提交 <?xml version="1.0" encoding="UTF-8"?>