场景:

  在做接口时,有的时候,接口入参只需要一个参数,如果将一个参数封装成一个对象很麻烦,故有了以下方式:

思路:

  spring自带的参数解析器貌似是不具备这个能力的,所有自定义

方式方法:

  1.定义一个注解

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestSingleParam {
String value(); boolean required() default true; String defaultValue() default "";
}

  2.定义解析器

public class RequestSingleParamHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter parameter) {
return parameter.hasParameterAnnotation(RequestSingleParam.class);
} @Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
RequestSingleParam requestSingleParam = parameter.getParameterAnnotation(RequestSingleParam.class);
HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
BufferedReader reader = request.getReader();
StringBuilder sb = new StringBuilder();
char[] buf = new char[];
int rd;
while ((rd = reader.read(buf)) != -) {
sb.append(buf, , rd);
}
JSONObject jsonObject = JSONObject.parseObject(sb.toString());
String value = requestSingleParam.value();
return jsonObject.get(value);
} }

  3.修改Springboot启动类(a.继承WebMvcConfigurerAdapter;b.重写addArgumentResolvers()方法)

@SpringBootApplication
@EnableWebMvc
public class SpringbootDemoApplication extends WebMvcConfigurerAdapter { public static void main(String[] args) {
SpringApplication.run(SpringbootDemoApplication.class, args);
} @Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers){
argumentResolvers.add(new RequestSingleParamHandlerMethodArgumentResolver());
super.addArgumentResolvers(argumentResolvers);
}
}

  4.在Controller中应用 

  调用接口方,传参如: {“name”:"张三"},Controller中就能获取到"张三”

    @RequestMapping(value = "/test",method = RequestMethod.POST)
public void test(@RequestSingleParam(value = "name") String name){
System.out.println(name);
}

  

05-11 14:11