背景

在使用spring-boot进行的web开发中，会碰到需要为Controller实现自定义的参数装配，比如说我们在Controller层中定义的方法：其中的TUserEntity往往是我们从Request中根据token解析的，那本文介绍的就是如何实现参数正确匹配。

@RequestMapping("/hello")@ResponseBodypublic Object test(TUserEntity entity) {    // to do     return entity;}

TUserEntity

public classTUserEntity {private int id;private String name;// getter setter}

Application 入口

@SpringBootApplication@ComponentScan(basePackageClasses = Application.class)public class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class,args);    }}

在spring boot中实现拦截器功能

@Componentpublic class MyInterceptor implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        //实际情况可能是从request中获得token，继而查找获得用户实体        TUserEntity entity = new TUserEntity();        entity.setId(30);        entity.setName("curry");        httpServletRequest.setAttribute("tUserEntity", entity);        return true;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {    }}

自定义参数解析器

@Componentpublic class MyArgumentResolver implements HandlerMethodArgumentResolver {    @Override    public boolean supportsParameter(MethodParameter methodParameter) {        return methodParameter.getParameterType().equals(TUserEntity.class);    }    @Override    public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {        return nativeWebRequest.getAttribute("tUserEntity", 0);    }}

以上基本就实现了功能，之后访问可以得到response: