MultipartFile 文件上传

1.文件必须选择

@PostMapping("/UpLoad") 
public void UpLoad(@RequestParam MultipartFile file，HttpServletRequest request) throws IllegalStateException, IOException{
  
            if(!file.isEmpty()){
              //上传文件路径
              String path="";
              File fileAllPath=new File(path);
              //上传文件名
              String fileName=file.getOriginalFilename();
              File filePath=new File(path,fileName);
             //判断是否存在，不存在新建
             if(!filePath.getParentFile().exists()){
                filePath.getParentFile().mkdir();
             }
              //将文件放到一个文件目录中去
              file.transferTo(new File(path + File.separator + 
               fileName));
       }
       //参数获取
       request.getParameter("参数对应name");
 }

 

 

2.文件自由选择

 

@PostMapping("/UpLoad") 
public void UpLoad(HttpServletRequest request) throws IllegalStateException, IOException{             
            //判断是否有文件需要上传    
            String contentType = request.getContentType();
            if (contentType != null && contentType.toLowerCase().startsWith("multipart/")) {
                MultipartHttpServletRequest multipartRequest =
                    WebUtils.getNativeRequest(request, MultipartHttpServletRequest.class);
                MultipartFile file = multipartRequest.getFile("file"); //file与传递过来的那么保持一致 
            } 
             
            if(!file.isEmpty()){
              //上传文件路径
              String path="";
              File fileAllPath=new File(path);
              //上传文件名
              String fileName=file.getOriginalFilename();
              File filePath=new File(path,fileName);
             //判断是否存在，不存在新建
             if(!filePath.getParentFile().exists()){
                filePath.getParentFile().mkdir();
             }
              //将文件放到一个文件目录中去
              file.transferTo(new File(path + File.separator + 
               fileName));
       }
       //参数获取
       request.getParameter("参数对应name");
 }