StandardMultipartHttpServletRequest上传文件

@PostMapping("upload")
public void upload(HttpServletRequest request, HttpServletResponse response){

    StandardMultipartHttpServletRequest httpServletRequest = (StandardMultipartHttpServletRequest) request;
    Enumeration<String> parameterNames = httpServletRequest.getParameterNames();
    System.out.println("-------------------ParameterNames------------------");
    while(parameterNames.hasMoreElements()){
        String key = parameterNames.nextElement();
        String value = httpServletRequest.getParameter(key);
        System.out.println("key = " + key);
        System.out.println("value = " + value);
    }
    System.out.println("-------------------AttributeNames------------------");
    Enumeration<String> attributeNames = httpServletRequest.getAttributeNames();
    while (attributeNames.hasMoreElements()){
        String key = attributeNames.nextElement();
        System.out.println("key = " + key);
    }
    System.out.println("-------------------HeaderNames------------------");
    Enumeration<String> headerNames = httpServletRequest.getHeaderNames();
    while (headerNames.hasMoreElements()) {
        String key = headerNames.nextElement();
        String value = httpServletRequest.getHeader(key);
        System.out.println(String.format("key: %s, value:%s",key,value));
    }
    System.out.println("-------------------FileNames------------------");
    Iterator<String> iterator = httpServletRequest.getFileNames();
    while (iterator.hasNext()) {
        MultipartFile file = httpServletRequest.getFile(iterator.next());
        String fileNames = file.getOriginalFilename();
        int split = fileNames.lastIndexOf(".");
        System.out.println("fileNames = " + fileNames);
    }
}