🔥码云GVP开源项目 12k star Uniapp+ElementUI 功能强大 支持多语言、二开方便! 广告
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 ```java @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 <?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 <?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> ``` ```java 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; } } ``` ```java 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(); } } ``` ```java 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; } } ```