最近学习了秒杀系统,做一些必要的笔记,一来是对自己学习的知识的巩固,二来对有同样问题的人有参考作用
1.在aop中进行校验登录,校验成功后将会员信息保存到ThreadLocal,调用
UserContext.setUser(user)方法;
UserContext 类:
public class UserContext {
private static ThreadLocal<User> userContext = new ThreadLocal<User>();
public static void setUser(User user){
userContext.set(user);
}
public static User getUser(){
return userContext.get();
}
}
2.写一个类实现HandlerMethodArgumentResolver,有两个实现方法,当supportsParameter返回true时,才会调用resolveArgument方法。
@Configuration
public class UserArgumentResolver implements HandlerMethodArgumentResolver {
@Override
public boolean supportsParameter(MethodParameter methodParameter) {
Class<?> clazz = methodParameter.getParameterType();
return clazz == User.class;
}
@Override
public Object resolveArgument(MethodParameter methodParameter, ModelAndViewContainer modelAndViewContainer, NativeWebRequest nativeWebRequest, WebDataBinderFactory webDataBinderFactory) throws Exception {
return UserContext.getUser();
}
}
3.将第二步的UserArgumentResolver加入到WebMvcConfigurerAdapter中
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Autowired
UsergumentResolver userArgumentResolver;
@Override
public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
argumentResolvers.add(userArgumentResolver);
}
}
4.在Controller的方法参数中直接获得该线程绑定的用户信息
@RequestMapping("user")
public User getUser(User user){
return user;
}
总结
如有错误恳请指正,如有侵权请联系我删除
参考文章:https://blog.csdn.net/xxwd12/article/details/90693140