js通过formData上传文件，Spring后台处理

1、前端

var formData = new FormData();
formData.append('file', $("#file").val());
$.ajax({
    url:'地址',
    type:'post',
    data:formData,
    async:false,
    processData:false,
    contentType:false,
    success:function (response) {
        alert(response.msg);
    }
})

2、controller

// 创建一个通用的多部分解析器
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
MultipartHttpServletRequest multiRequest = commonsMultipartResolver.resolveMultipart((HttpServletRequest) request);

List<String> strList = new ArrayList<String>();
String fileName = null;
List<MultipartFile> files = request.getMultiFileMap().get("file");
if(files != null) {
    for (MultipartFile file : files){
        String myFileName = file.getOriginalFilename();
        if (myFileName.trim() != ""){
            // 获得图片的原始名称
            String originalFilename = file.getOriginalFilename();
            // 获得图片后缀名称
            String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
            // 获得上传路径的绝对路径地址
            String realPath = request.getSession().getServletContext().getRealPath(路径);
            File realPathDirectory = new File(realPath);
            if (realPathDirectory == null || !realPathDirectory.exists()){
                realPathDirectory.mkdirs();
            }
            // 采用UUID的方式重命名上传后的文件名
            fileName = java.util.UUID.randomUUID().toString() + suffix;
            File uploadFile = new File(realPathDirectory + "/" + fileName);
            file.transferTo(uploadFile);
            strList.add(request.getContextPath() + "/" + DirectoryName + fileName);
        }
    }}