60.SpringBoot學習筆記--啓動配置原理-自定義starter

starter：

​ 1、這個場景需要使用到的依賴是什麼？

​ 2、如何編寫自動配置

@Configuration  //指定這個類是一個配置類
@ConditionalOnXXX  //在指定條件成立的情況下自動配置類生效
@AutoConfigureAfter  //指定自動配置類的順序
@Bean  //給容器中添加組件

@ConfigurationPropertie結合相關xxxProperties類來綁定相關的配置
@EnableConfigurationProperties //讓xxxProperties生效加入到容器中

//自動配置類要能加載
//將需要啓動就加載的自動配置類，配置在META-INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\

​ 3、模式：

啓動器只用來做依賴導入；

專門來寫一個自動配置模塊；

啓動器依賴自動配置；別人只需要引入啓動器（starter）

mybatis-spring-boot-starter；自定義啓動器名-spring-boot-starter

步驟：

1）、啓動器模塊

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>demo.yangxu.starter</groupId>
    <artifactId>yangxu-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!--啓動器-->
    <dependencies>

        <!--引入自動配置模塊-->
        <dependency>
            <groupId>demo.yangxu.starter</groupId>
            <artifactId>yangxu-spring-boot-starter-autoconfigurer</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

2）、自動配置模塊

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>

   <groupId>demo.yangxu.starter</groupId>
   <artifactId>yangxu-spring-boot-starter-autoconfigurer</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>

   <name>yangxu-spring-boot-starter-autoconfigurer</name>
   <description>Demo project for Spring Boot</description>

   <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.5.10.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>

   <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
      <java.version>1.8</java.version>
   </properties>

   <dependencies>

      <!--引入spring-boot-starter；所有starter的基本配置-->
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter</artifactId>
      </dependency>

   </dependencies>



</project>

package demo.yangxu.starter;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "yangxu.hello")
public class HelloProperties {

    private String prefix;
    private String suffix;

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public String getSuffix() {
        return suffix;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }
}

package demo.yangxu.starter;

public class HelloService {

    HelloProperties helloProperties;

    public HelloProperties getHelloProperties() {
        return helloProperties;
    }

    public void setHelloProperties(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }

    public String sayHellyangxu(String name){
        return helloProperties.getPrefix()+"-" +name + helloProperties.getSuffix();
    }
}

package demo.yangxu.starter;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConditionalOnWebApplication //web應用才生效
@EnableConfigurationProperties(HelloProperties.class)
public class HelloServiceAutoConfiguration {

    @Autowired
    HelloProperties helloProperties;
    @Bean
    public HelloService helloService(){
        HelloService service = new HelloService();
        service.setHelloProperties(helloProperties);
        return service;
    }
}