SpringBoot如果接受json参数的话需要定义实体类然后使用@RequestBody注解，但是如果每个接口都创建一个实体类的话太麻烦，因此可以使用自定义注解的方法接收。从网上发现了这篇博客，解决了一个大大的疑惑。。转载： 大佬的博客

1. RequestJson

package com.school.service.config;import java.lang.annotation.*;@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestJson {/*** 值*/String value() default "";/*** 是否必须*/boolean require() default false;
}

1. RequestJsonHandlerMethodArgumentResolver

package com.school.service.config;import com.alibaba.fastjson.JSONObject;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.rmi.ServerException;@Slf4j
public class RequestJsonHandlerMethodArgumentResolver  implements HandlerMethodArgumentResolver {/*** key*/private static final String JSON_BODY_KEY = "JSON_BODY_KEY";@Overridepublic boolean supportsParameter(MethodParameter parameter) {return parameter.hasParameterAnnotation(RequestJson.class);}@Overridepublic Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {// 获取jsonNodeJsonNode jsonNode = getJsonBody(webRequest);RequestJson requestSingleParam = parameter.getParameterAnnotation(RequestJson.class);// 名String value = determineParamName(parameter, requestSingleParam);// 结果JsonNode paramValue = jsonNode.get(value);// 是否必须boolean require = requestSingleParam.require();if (paramValue == null && require) {throw new ServerException("parameter[" + value + "]不能为空。");}if (paramValue == null) {return null;}Class<?> parameterType = parameter.getParameterType();Constructor<?> constructor = parameterType.getConstructor(String.class);Object param = null;try {param = constructor.newInstance(paramValue.asText());} catch (Exception e) {log.error("bind method parameters error", e);throw new ServerException("parameter[" + value + "] format error for input value[" + paramValue.toString() + "]");}return param;}private String determineParamName(MethodParameter parameter, RequestJson requestSingleParam) {String value = requestSingleParam.value();if (value == null  || value.isEmpty()) {value = parameter.getParameterName();}return value;}private JsonNode getJsonBody(NativeWebRequest webRequest) throws JsonProcessingException {// 有就直接获取String jsonBody = (String) webRequest.getAttribute(JSON_BODY_KEY, NativeWebRequest.SCOPE_REQUEST);// 没有就从请求中读取if (jsonBody == null) {try {HttpServletRequest servletRequest = webRequest.getNativeRequest(HttpServletRequest.class);jsonBody = IOUtils.toString(servletRequest.getReader());webRequest.setAttribute(JSON_BODY_KEY, jsonBody, NativeWebRequest.SCOPE_REQUEST);} catch (IOException e) {throw new RuntimeException(e);}}return new ObjectMapper().readTree(jsonBody);}
}

1. 配置config

package com.school.service.config;import org.springframework.context.annotation.Configuration;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;import java.io.File;
import java.util.List;@Configuration
public class WebMvcConfig implements WebMvcConfigurer {@Overridepublic void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {resolvers.add(new RequestJsonHandlerMethodArgumentResolver());WebMvcConfigurer.super.addArgumentResolvers(resolvers);}
}

1. 使用

public Result register(@RequestJson String userCode, @RequestJson String nickName, @RequestJson String password) {

成功