问题描述：

@RequestMapping("/notify")
public String notify(HttpServletRequest request) {
	log.info("request.getParameterNames():{}", JSON.toJSONString(request.getParameterNames()));
	Enumeration<String> parameterNames = request.getParameterNames();

日志结果：

request.getParameterNames():[]

问题分析：

请求为–表单请求，POST：【POSTMAN】
Content-Type：application/x-www-form-urlencoded
Body: 选x-www-form-urlencoded，然后填入值

请求日志的过滤器:

public class LogFilter extends OncePerRequestFilter {

	@Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        request = new RequestWrapper(request); 
        response = new ResponseWrapper(response);
        filterChain.doFilter(request, response);
    }

RequestWrapper的构造函数，调用getInputStream，导致getParameter数据量为空。

解决方案：

将request = new RequestWrapper(request); 改成request = new HttpServletRequestWrapper(request);即可。

日志输出：request.getParameterNames():["\"BankType\"",