CommandLineRunner, AppContext初始化后自动执行的程序

Interface used to indicate that a bean should run when it is contained within a SpringApplication. Multiple CommandLineRunner beans can be defined within the same application context and can be ordered using the Ordered interface or @Order annotation.

@SpringBootApplication(scanBasePackages= {"cmd","util"}) public class CmdLinerApplication {         private static ApplicationContext appCtx; public static void main(String[] args) {         appCtx = SpringApplication.run(CmdLinerApplication.class, args);         System.out.println("set appCtx after run CmdLinerApplication"); } public static ApplicationContext appCtx() {         return appCtx; } }

@Component public class CmdLineAppString {         private String information = "CmdLineAppString:"; public String getInformation() {         return information; } public void setInformation(String information) {         this.information = information; } public void appendInformation(String apxInfo) {         this.information = this.information + ":" + apxInfo; } }

@Component public class SpringContextUtil implements ApplicationContextAware {         private static ApplicationContext applicationContext; public static ApplicationContext getAppCtx() {         return applicationContext; } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {         SpringContextUtil.applicationContext = applicationContext; } }

ApplicationContextAware 获取ApplicationContext  

@Component @Order(1) public class CmdLineApp1 implements CommandLineRunner { @Override public void run(String... args) throws Exception {         CmdLineAppString apx = SpringContextUtil.getAppCtx().getBean(CmdLineAppString.class);         apx.appendInformation("CmdLineApp1 start");         System.out.println(apx.getInformation()); } }

自动注入的方式获取ApplicationContext

@Component @Order(2) public class CmdLineApp2 implements CommandLineRunner { @Autowired private ApplicationContext appCtx; @Override public void run(String... args) throws Exception {         CmdLineAppString apx = appCtx.getBean(CmdLineAppString.class);         apx.appendInformation("CmdLineApp2 start");         System.out.println(apx.getInformation()); } }

执行结果：

CmdLineAppString::CmdLineApp1 start

CmdLineAppString::CmdLineApp1 start:CmdLineApp2 start

set appCtx after run CmdLinerApplication