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IDEA创建maven的spring boot项目,【极简版】监听器+拦截器

项目结构在(IDEA创建maven的spring boot项目,【极简版】切面编程+swagger调用 )基础上实现

1、拦截器

----src

--------main

--------|---java

--------|---|----com.demo

--------|---|---|---config

--------|---|---|---|----MyInterceptor

--------|---|---|---|----AppConfig

--------|---|---|---controller

--------|---|---|---|----TestController

--------|---|---|---|----DemoApplication

--------|---resources

--------|---|----application.yml

主要类:

  1)拦截器操作类——拦截先后和操作

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // 在请求处理之前执行的逻辑,返回true表示继续执行请求处理,返回false表示中止请求处理
        System.out.println("Pre-handle method is called");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
        // 在请求处理之后视图渲染之前执行的逻辑
        System.out.println("Post-handle method is called");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
            Exception ex) throws Exception {
        // 在请求处理完成后执行的逻辑
        System.out.println("After-completion method is called");
    }
}

 

  2)拦截器配置类——拦截范围【此处拦截所有接口】

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class AppConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 注册自定义拦截器
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/*");
    }
}

 

2、监听器

----src

--------main

--------|---java

--------|---|----com.demo

--------|---|---|---config

--------|---|---|---|----MyApplicationListener

--------|---|---|---controller

--------|---|---|---|----TestController

--------|---|---|---|----DemoApplication

--------|---resources

--------|---|----application.yml

涉及的类:

1)MyApplicationListener——监听到后执行的逻辑

import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

@Component
public class MyApplicationListener implements ApplicationListener<ApplicationReadyEvent> {

    @Override
    public void onApplicationEvent(ApplicationReadyEvent event) {
        // 在应用程序启动后执行的逻辑——打印一串文字
        System.out.println("Application is ready to accept requests.");
    }
}

2)触发类——项目启动后,最后一行打印上面类中的一行字

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication{

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

 

posted @ 2023-09-18 10:51  -涂涂-  阅读(37)  评论(0编辑  收藏  举报