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因为要上传文件所以得用form-data，上传文件同时还想再放入一个List集合对象，实现方式就是前段用JSON.stringify()方法将JavaScript对象或值转换为JSON字符串，后台使用字符串接收然后解析一下。
前段：
图片是ApiPost接口调试工具，类似postMan
这里传入的字符串已经是json格式的了，图片是多个文件；
后台
后台可以接收到files，feedbackBills集合和其他数据了
import com.fasterxml.jackson.core.type.TypeReference;——注意这个类型 @PostMapping(
"/verifyAssets") public AjaxResult verifyAssets(DismantleSiteOrderBody
dismantleSiteOrderBody, MultipartFile[] files, String feedbackBills) { List<
FeedbackBill> feedbackBillList = objectMapper.readValue(feedbackBills, new
TypeReference<List<FeedbackBill>>() {}); return success(); }
这样写的原因：spring不使用formdata，可以自动映射，用了formdata就不行了，所以遇到formdata中带文件和数据一起上传的情况只能自己映射了
不使用@RequestBody原因：SpringMVC在接收集合请求参数时，需要在Controller方法的集合参数里前添加@RequestBody，而@RequestBody默认接收的enctype(MIME编码)是application/json，因此发送POST请求时需要设置请求报文头信息，否则SpringMVC在解析集合请求参数时不会自动的转换成JSON数据再解析成相应的集合。
