自定义HandlerMethodArgumentResolver获取请求参数

获取get中参数

通过get请求过来自定义转换成指定类型
    localhost:8080/MySSM/testModAttr.html?names={"id":"12","name":"xhj","money":"12.12"}

    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer arg1, NativeWebRequest webRequest,
            WebDataBinderFactory arg3) throws Exception {
        String names = (String)webRequest.getParameter("names");  
        return JSONObject.parseObject(names, parameter.getParameterType());
    }

获取post中参数

第一种

public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        String json =  getRequestBody(webRequest);
        return JSONObject.parseObject(json, parameter.getParameterType());
    }

    private String getRequestBody(NativeWebRequest webRequest) {
        HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);
        String jsonBody = (String) webRequest.getAttribute(JSONBODYATTRIBUTE, NativeWebRequest.SCOPE_REQUEST);
        if (jsonBody == null) {
            try {
                jsonBody = IOUtils.toString(servletRequest.getInputStream());
                webRequest.setAttribute(JSONBODYATTRIBUTE, jsonBody, NativeWebRequest.SCOPE_REQUEST);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        return jsonBody;
    }

第二种

public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
        HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
         // 把reqeust的body读取到StringBuilder
        BufferedReader reader = request.getReader();
        StringBuilder sb = new StringBuilder();

        char[] buf = new char[1024];
        int rd;
        while((rd = reader.read(buf)) != -1){
            sb.append(buf, 0, rd);
        }
        System.out.println(sb.toString());
        return JSONObject.parseObject(sb.toString(), parameter.getParameterType());
    }