基于SpringBoot开机启动与@Order注解

package com.example.zcw.runner;

import lombok.extern.slf4j.Slf4j;

import org.springframework.boot.ApplicationArguments;

import org.springframework.boot.ApplicationRunner;

import org.springframework.core.annotation.Order;

import org.springframework.stereotype.Component;

/**

  * @Classname BootApplicationRunner

  * @Description TODO

  * @Date 2020/3/6 13:06

  * @Created by zhaocunwei

  */

@Order ( 2 )

@Slf4j

@Component

public class BootApplicationRunner implements ApplicationRunner {

     @Override

     public void run(ApplicationArguments args) throws Exception {

         log.info( "This is BootApplicationRunner ..." );

     }

}

package com.example.zcw.runner;

import lombok.extern.slf4j.Slf4j;

import org.springframework.boot.CommandLineRunner;

import org.springframework.core.annotation.Order;

import org.springframework.stereotype.Component;

/**

  * @Classname BootCommandLineRunner

  * @Description TODO

  * @Date 2020/3/6 13:09

  * @Created by zhaocunwei

  */

@Order ( 1 )

@Slf4j

@Component

public class BootCommandLineRunner implements CommandLineRunner {

     @Override

     public void run(String... args) throws Exception {

         log.info( "This is BootCommandLineRunner ..." );

     }

}

@Retention (value=RUNTIME)

@Target (value={TYPE,METHOD,FIELD})

@Documented

public @interface Order

package com.javapapers.spring3.autowire.collection;

public interface Ranks { 

}

package com.javapapers.spring3.autowire.collection;

import org.springframework.core.annotation.Order;

import org.springframework.stereotype.Component;

@Component

public class RankOne implements Ranks{

  private String rank = "RankOne" ;

  public String toString(){

   return this .rank;

  }

}

package com.javapapers.spring3.autowire.collection;

import org.springframework.core.annotation.Order;

import org.springframework.stereotype.Component;

@Component

public class RankTwo implements Ranks{

  private String rank = "RankTwo" ;

  public String toString(){

   return this .rank;

  }

}

package com.javapapers.spring3.autowire.collection;

import org.springframework.core.annotation.Order;

import org.springframework.stereotype.Component;

@Component

public class RankThree implements Ranks{

  private String rank = "RankThree" ;

  public String toString(){

   return this .rank;

  }

}

Component to hold student ranks in a collection as shown below.

package com.javapapers.spring3.autowire.collection;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component

public class Results {

   @Autowired

   private List ranks ;

   @Override

   public String toString(){

    return ranks.toString();

   }

}

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

  xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

  xmlns:context = "http://HdhCmsTestspringframework.org/schema/context"

  xsi:schemaLocation="http://HdhCmsTestspringframework.org/schema/beans

   http://HdhCmsTestspringframework.org/schema/beans/spring-beans.xsd

   http://HdhCmsTestspringframework.org/schema/context

   http://HdhCmsTestspringframework.org/schema/context/spring-context.xsd">

   < context:annotation-config />

   < context:component-scan base-package = "com.javapapers.spring3" />

</ beans >

package com.javapapers.spring3.autowire.collection;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class RanksClient {

  public static void main(String[] args) {

   ApplicationContext context = new ClassPathXmlApplicationContext( "beans.xml" );

   Results results = (Results)context.getBean( "results" );

   System.out.println(results);

  }

}

@Component

@Order ( 1 )

public class RankOne implements Ranks{

private String rank = "RankOne" ;   

     public String toString(){

         return this .rank;

     }

}