为每个控制器内的每个动作设置模型属性 [英] Setting model attributes for every action within each controller

问题描述

我想在我的模型中为Spring Boot应用程序中许多控制器中的每个@RequestMapping设置三个通用属性.我已经读过关于@ModelAttribute的内容，但是需要将其放置在每个Controller中.我的应用程序中有20多个控制器，每个控制器都有10个以上的@RequestMapping.

I would like to set three common attributes on my model for each @RequestMapping within the many controllers in a Spring Boot application. I have read about @ModelAttribute but it needs to be placed within each Controller. I have more than 20 controllers in my application and each having more than 10 @RequestMapping.

有没有办法在一个地方设置这种模型属性，并在应用程序启动时对其进行初始化?

Is there a way to set such model attributes in one place which gets initialized at the start of the application?

推荐答案

如果您想在Spring Boot启动时执行一些代码，请考虑以下问题:

If you want to execute some code on Spring Boot startup, consider this:

Spring Boot启动侦听器

但是我想您确实想要与控制器相关的行为，我建议您使用全局拦截器.

使用全局拦截器，您可以干扰Spring中的请求-响应生命周期.

With global interceptor, you can interfere with the request-response lifecycle in Spring.

它使您可以在3个不同的点上向请求-响应生命周期添加功能:

It lets you add functionality to request-response life cycle in 3 different points:

1. 在控制器处理请求之前
2. 处理程序完成其功能后
3. 视图将要呈现给最终用户时.

只需创建一个从HandlerInterceptorAdapter扩展的类，并使用所需的功能覆盖三个方法之一即可.

Just create a class which extends from HandlerInterceptorAdapter and override one of three methods, with your desired functionality.

例如:

public class MyInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        request.setAttribute("myFirstAttribute", "MyFirstValueHere");
        return super.preHandle(request, response, handler);
    }

}

以下是有关如何使用Spring Boot进行操作的示例:

Here's an example on how to do it with Spring Boot:

@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

  @Autowired 
  MyInterceptor myInterceptor;

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(...)
    ...
    registry.addInterceptor(myInterceptor);
  }
}

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