封面

『Spring Boot系列』—— 8.自定义starter

  |     |   本文总阅读量:

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

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@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

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<?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

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<?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>
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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;
}
}
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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();
}
}
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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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