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")
@ResponseBody
public 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**
@Component
public 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**
@Component
public 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http://localhost:8080/hello?name=1234可以得到response:
{"id":30,"name":"curry"}
哈哈 我就是库密
