如何使模型属性全局化? [英] How to make a Model attribute global?

问题描述

我正在使用 Spring MVC Framework 并且我希望 View 的所有 .jsp 页面都可以访问用户的属性(姓名、性别、年龄……).到目前为止，我在每个Controller中使用Model(UI)的addAttribute方法将当前User的属性传递给View.有没有办法只执行一次并避免在每个 Controller 中使用相同的代码?

I'm using Spring MVC Framework and I'd like all the .jsp pages of the View to have access to the User's attributes(name, sex, age...). So far, I use the addAttribute method of the Model(UI) in every Controller to pass the current User's attributes to the View. Is there a way to do this only once and avoid having the same code in every Controller?

推荐答案

您可以像这样在新的 Controller 类上使用 Spring 的 @ControllerAdvice 注释:

You can use Spring's @ControllerAdvice annotation on a new Controller class like this:

@ControllerAdvice
public class GlobalControllerAdvice {

    @ModelAttribute("user")
    public List<Exercice> populateUser() {
        User user = /* Get your user from service or security context or elsewhere */;
        return user;
    }
}

populateUser 方法将在每个请求上执行，因为它有一个 @ModelAttribute 注释，该方法的结果(Userobject) 将通过 user 名称为每个请求放入模型中，它在 @ModelAttribute 注释上声明.

The populateUser method will be executed on every request and since it has a @ModelAttribute annotation, the result of the method (the User object) will be put into the model for every request through the user name, it declared on the @ModelAttribute annotation.

因此，使用 ${user} 的用户将在您的 jsp 中可用，因为这是给 @ModelAttribute 的名称(例如:@ModelAttribute("fooBar") -> ${fooBar} )

Theefore the user will be available in your jsp using ${user} since that was the name given to the @ModelAttribute (example: @ModelAttribute("fooBar") -> ${fooBar} )

您可以将一些参数传递给 @ControllerAdvice 注释，以指定此全局控制器建议哪些控制器.例如:

You can pass some arguments to the @ControllerAdvice annotation to specify which controllers are advised by this Global controller. For example:

@ControllerAdvice(assignableTypes={FooController.class,BarController.class})

或

@ControllerAdvice(basePackages={"foo.bar.web.admin","foo.bar.web.management"}))

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