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Spring BootのHandlerInterceptorで実行されるControllerのクラス名やメソッド名を取得する

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1. やりたいこと

  • HandlerInterceptorで実行されるControllerのクラス名やメソッド名を取得する

2. バージョンや条件など

  • Spring Boot 2.1.7.RELEASE

3. やったこと

DemoInterceptor.java
public class DemoInterceptor extends HandlerInterceptorAdapter {

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

        // (1) HandlerMethodでない場合スキップ
        // jsとかだとorg.springframework.web.servlet.resource.ResourceHttpRequestHandlerになる
        if (!HandlerMethod.class.isInstance(handler)) {
            return true;
        }

        // (2) handlerをHandlerMethodにcastする
        HandlerMethod handlerMethod = HandlerMethod.class.cast(handler);

        // (3) 実行されるControllerのクラス名
        String beanTypeName = handlerMethod.getBeanType().getName();

        // (4) 実行されるメソッドのメソッド名
        String methodName = handlerMethod.getMethod().getName();

        // (5) ショートログメッセージ
        // 以下のようにFQCN#MethodName[Arguments]が取得できる
        // [example]
        // case1) No arguments
        // jp.gr.java_conf.pekokun.web.app.HelloController#say[0 args]
        // case2) 1 argument
        // jp.gr.java_conf.pekokun.web.app.HelloController#say[1 args]
        String shortLogMessage = handlerMethod.getShortLogMessage();

        // (6) メソッドのパラメータの情報も取得できる
        // handlerMethod.getMethodParameters()...

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

おわり。

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