springboot專案啟動成功後執行一段程式碼的兩種方式

實現ApplicationRunner介面

package com.lnjecit.lifecycle;

import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

 
/**
 * @author lnj
 * createTime 2018-11-07 22:37
 **/
@Component
public class ApplicationRunnerImpl implements ApplicationRunner {
    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println("通過實現ApplicationRunner介面，在spring boot專案啟動後列印引數");
        String[] sourceArgs 
 
= args.getSourceArgs();
        for (String arg : sourceArgs) {
            System.out.print(arg + " ");
        }
        System.out.println();
    }
}

專案啟動後，會列印如下資訊：

實現CommandLineRunner介面

package com.lnjecit.lifecycle;

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

/**
 * @author lnj
 * createTime 2018-11-07 22:25
 **/
@Component
public class CommandLineRunnerImpl implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("通過實現CommandLineRunner介面，在spring boot專案啟動後列印引數");
        for (String arg : args) {
            System.out.print(arg + " ");
        }
        System.out.println();
    }
}

 兩種實現方式的不同之處在於run方法中接收的引數型別不一樣

指定執行順序

當專案中同時實現了ApplicationRunner和CommondLineRunner介面時，可使用Order註解或實現Ordered介面來指定執行順序，值越小越先執行

案例地址

https://github.com/linj6/springboot-learn/tree/master/springboot-runner

參考資料

https://blog.csdn.net/zknxx/article/details/52196427