如何设置控制器范围的全局变量 [英] How to set Controller-wide global variables

问题描述

目前我使用 @ModelAttribute 在我的 @Controller 中设置全局变量（例如页脚的推文）：

Currently I use @ModelAttribute to set global variables (e.g. tweets for the footer) in my @Controller:

public @Controller class MainController {
    public @ModelAttribute void global(ModelMap map) {
        map.addAttribute("tweets", /*...*/null);
    }
}

但是在创建另一个Controller时，它们在逻辑上已经消失了保持清洁和分离：

But they're logically gone when creating another Controller to keep things clean and separated:

public @Controller class GalleryController {
    // ...
}

设置全局变量控制器范围的最佳做法是什么？

What's the best practice to set global variables Controller wide?

推荐答案

如果你想把一些数据放到每个页面上，很容易使用拦截器：

If you want to put some data to every page it is easy to use interceptor:

public class PagePopulationInterceptor extends HandlerInterceptorAdapter {

    @Autowired
    private UserService userService;

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        if(modelAndView != null) {
            User user = userService.findOne(request);
            modelAndView.addObject("myUserProfile", user);
        }
    }

}

制作这项工作还在webmvc-config.xml中声明拦截器（webapp的弹簧配置）：

To make this work also declare interceptor in webmvc-config.xml (spring configuration for webapp):

<mvc:interceptors>
    <mvc:interceptor>
        <mvc:mapping path="/**"/>
        <bean class="com.yourcompany.yourapp.util.PagePopulationInterceptor" />
    </mvc:interceptor>
    <!-- other interceptors (locale, theme and so on) -->
</mvc:interceptors>

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