springBoot项目启动时，手动设置执行初始化操作

在某些业务场景下，我们需要springboot启动之后自动去执行某些操作，比如打开首页或者跳转至其他url，这时候有需要手动配置初始化操作：一般方法有2种:

介绍最简单的一种方法：

方法一、spring容器自动加载完自动监听(推荐)

以初始化打开一个html为示例

1.编写Component组件，使其在spring容器自动加载完自动监听

package com.lgy.Initialization;

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

@Component
public class Initialization_Index implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("初始化第一个页面");
        try {
            Runtime.getRuntime().exec("cmd  /c  start  http://localhost:8083/springBootDemo/test/hello");
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

2.启动Application类

package com.lgy;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.lgy.dao")  //Mapper扫描
public class SpringBootDemoApplication {
    //启动tomcat部署本项目
    public static void main(String[] args) {

        SpringApplication.run(SpringBootDemoApplication.class,args);
    }
}

启动之后，自动打开html页面，配置成功！

方法二：手动给spring加入监听任务，比较麻烦

第1步：先写1个线程类，在springboot启动加载完，自动执行的操作放在里面

package com.sinosoft.speech.util;
import org.springframework.stereotype.Component;
/**
 * 需要执行的操作
 * @author lijunming
 * @date 2018/7/22 下午2:54
 */
@Component
public class StepExecutor implements Runnable {
    @Override
    public void run() {
        startStreamTask();
 
    }
    /**
     * 项目启动后打开1个页面
     */
    public void startStreamTask() {
        System.out.println("开始启动1个页面");
        try {
            Runtime.getRuntime().exec("cmd   /c   start   http://localhost:8080/index");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
 
}

第2步，写1个监听器，监听项目加载完后执行指定操作

package com.sinosoft.speech.util;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
/**
 * spring boot 容器加载完成后执行
 * @author lijunming
 * @date 2018/7/22 下午3:04
 */
public class ApplicationStartup implements ApplicationListener<ContextRefreshedEvent> {
    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        ApplicationContext ac = event.getApplicationContext();
        StepExecutor StepExecutor = ac.getBean(StepExecutor .class);
        Thread thread = new Thread(StepExecutor);
        thread.start();
    }
}

第3步，给springboot的启动类添加监听任务

package com.sinosoft.speech;
import com.sinosoft.speech.util.ApplicationStartup;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
 * @author lijunming
 * @date 2018/7/22 下午2:40
 */
@SpringBootApplication
public class SpeechApplication {
 
    public static void main(String[] args) {
        SpringApplication springApplication = new SpringApplication(SpeechApplication .class);
        springApplication.addListeners(new ApplicationStartup());
        springApplication.run(args);
    }
}

参考