第八章-Spring Boot 自定义starters

starter:

1、这个场景需要使用到的依赖是什么?

2、如何编写自动配置

@Configuration  //指定这个类是一个配置类
@ConditionalOnXXX  //在指定条件成立的情况下自动配置类生效
@AutoConfigureAfter  //指定自动配置类的顺序
@Bean  //给容器中添加组件
​
@ConfigurationPropertie结合相关xxxProperties类来绑定相关的配置
@EnableConfigurationProperties //让xxxProperties生效加入到容器中
​
自动配置类要能加载
将需要启动就加载的自动配置类,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:

启动器只用来做依赖导入;

专门来写一个自动配置模块;

启动器依赖自动配置;别人只需要引入启动器(starter)

mybatis-spring-boot-starter;自定义启动器名-spring-boot-starter

步骤:

1)、启动器模块

<?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>com.atguigu.starter</groupId>
    <artifactId>atguigu-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
​
    <!--启动器-->
    <dependencies>
​
        <!--引入自动配置模块-->
        <dependency>
            <groupId>com.atguigu.starter</groupId>
            <artifactId>atguigu-spring-boot-starter-autoconfigurer</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
​
</project>

2)、自动配置模块

<?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>com.atguigu.starter</groupId>
   <artifactId>atguigu-spring-boot-starter-autoconfigurer</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>
​
   <name>atguigu-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 com.atguigu.starter;
​
import org.springframework.boot.context.properties.ConfigurationProperties;
​
@ConfigurationProperties(prefix = "atguigu.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 com.atguigu.starter;
​
public class HelloService {
​
    HelloProperties helloProperties;
​
    public HelloProperties getHelloProperties() {
        return helloProperties;
    }
​
    public void setHelloProperties(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }
​
    public String sayHellAtguigu(String name){
        return helloProperties.getPrefix()+"-" +name + helloProperties.getSuffix();
    }
}
​
package com.atguigu.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应用才生效
@EnableConfigurationProperties(HelloProperties.class)
public class HelloServiceAutoConfiguration {
​
    @Autowired
    HelloProperties helloProperties;
    @Bean
    public HelloService helloService(){
        HelloService service = new HelloService();
        service.setHelloProperties(helloProperties);
        return service;
    }
}
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