最近在项目过程中需要在程序启动时额外加载一些信息,查询了资料之后终于找到了以下途径。
直接上代码:
package com.xxx.biz;
import com.alibaba.fastjson.JSONObject;
import com.xxx.biz.dao.AppClientMapper;
import com.xxx.biz.dao.AppMapper;
import com.xxx.biz.entity.App;
import com.xxx.biz.entity.AppClient;
import com.xxx.biz.service.IAppService;
import com.xxx.redis.util.RedisUtil;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.util.StringUtils;
import java.util.List;
@EnableTransactionManagement
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@MapperScan("com.xxx.biz.dao")
@ComponentScan("com.xxx")
public class BizApp implements ApplicationListener<ContextRefreshedEvent>
{
public static void main(String[] args){
SpringApplication.run(BizApp .class, args);
}
/**
程序启动时事件,覆盖ApplicationListener onApplicationEvent方法
在event中可以获取AllicationContext,从而可以获取到spring容器管理的bean实例
*/
@Override
public void onApplicationEvent(ContextRefreshedEvent event) {
RedisUtil redisUtil=event.getApplicationContext().getBean(RedisUtil.class);
String appClientValue= redisUtil.getStringValue(IAppService.APP_CLIENT_SECRET_LIST);
if(StringUtils.isEmpty(appClientValue)){
AppClientMapper appClientMapper=event.getApplicationContext().getBean(AppClientMapper.class);
List<AppClient> appClientList= appClientMapper.selectAll();
redisUtil.setStringValue(IAppService.APP_CLIENT_SECRET_LIST, JSONObject.toJSONString(appClientList));
}
String appListValue = redisUtil.getStringValue(IAppService.APP_LIST);
if(StringUtils.isEmpty(appListValue)){
AppMapper appMapper=event.getApplicationContext().getBean(AppMapper.class);
List<App> appList = appMapper.selectAll();
redisUtil.setStringValue(IAppService.APP_LIST, JSONObject.toJSONString(appList));
}
}
}