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Spring 控制器：我可以在调用每个 @RequestMapping 方法之前调用一个方法吗？

发布于 2024-10-18 22:33:22 字数 144 浏览 3 评论 0原文

我有一些通用组件，它们始终存在于给定控制器类提供的每个页面中。

在每个 @RequestMapping 方法的开头，我使用这些通用组件填充模型。

有没有一种方法可以定义在每个控制器方法之前调用的方法，以便我可以将所有这些复制/粘贴到一个地方？

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一曲琵琶半遮面シ 2024-10-25 22:33:22

只需使用 @ModelAttribute 注释一个方法，

下面将以名称“foo”向模型添加一个 Foo 实例，

@ModelAttribute("foo")
public Foo foo() {
    return new Foo();
}

请参阅 @ModelAttribute 文档

Just annotate a method with @ModelAttribute

The below would add a Foo instance to the model under the name "foo"

@ModelAttribute("foo")
public Foo foo() {
    return new Foo();
}

See the @ModelAttribute documentation

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聚集的泪 2024-10-25 22:33:22

拦截器就是解决方案。它有 preHandler 和 postHandler 方法，分别在每次请求之前和之后调用。您可以挂钩每个 HTTPServletRequest 对象，也可以通过挖掘它来绕过一些对象。

这是示例代码：

@Component
public class AuthCodeInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {

        // set few parameters to handle ajax request from different host
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
        response.addHeader("Access-Control-Max-Age", "1000");
        response.addHeader("Access-Control-Allow-Headers", "Content-Type");
        response.addHeader("Cache-Control", "private");

        String reqUri = request.getRequestURI();
        String serviceName = reqUri.substring(reqUri.lastIndexOf("/") + 1,
                reqUri.length());
                if (serviceName.equals("SOMETHING")) {

                }
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {

        super.postHandle(request, response, handler, modelAndView);
    }
}

Interceptor is the solution. It has methods preHandler and postHandler, which will be called before and after each request respectively. You can hook into each HTTPServletRequest object and also by pass few by digging it.

here is a sample code:

@Component
public class AuthCodeInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {

        // set few parameters to handle ajax request from different host
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS");
        response.addHeader("Access-Control-Max-Age", "1000");
        response.addHeader("Access-Control-Allow-Headers", "Content-Type");
        response.addHeader("Cache-Control", "private");

        String reqUri = request.getRequestURI();
        String serviceName = reqUri.substring(reqUri.lastIndexOf("/") + 1,
                reqUri.length());
                if (serviceName.equals("SOMETHING")) {

                }
        return super.preHandle(request, response, handler);
    }

    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {

        super.postHandle(request, response, handler, modelAndView);
    }
}

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