Servlet容器监听器

package com.biniu;

import org.mybatis.spring.annotation.MapperScan;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.scheduling.annotation.EnableScheduling;

/**
 * @Configuration, @EnableAutoConfiguration, @ComponentScan == @SpringBootApplication
 */
@SpringBootApplication
@EnableScheduling
@ServletComponentScan
public class BaseWebApplication {
    /**
     * 程序主方法
     * @param args
     */
    public static void main(String[] args) {
        // 调用Springboot的run方法，启动Spring，自动配置servlet容器
        SpringApplication.run(BaseWebApplication.class, args);
    }
}

package com.biniu.Listener;

import com.biniu.properties.CommonProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;

/**
 * Servlet容器监听器
 * Created by lay on 01/03/2018.
 */
@WebListener
public class ServletCtxListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {
        System.out.println("servlet context 初始化开始");

        ServletContext servletContext = servletContextEvent.getServletContext();
        ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(servletContext);
        CommonProperties commonProperties = context.getBean(CommonProperties.class);
        // 设置图片域名地址
        String imageUrl = commonProperties.getImageUrl();
        servletContext.setAttribute("imageUrl", imageUrl);

        System.out.println("servlet context 初始化完成");
    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        System.out.println("servlet context 销毁");
    }
}