SpringBoot自定义Starters 浅谈SpringBoot怎样自定义Starters
明了LM 人气:0一、Starters原理
1.1 Starters场景启动器
1、场景需要用到的依赖是什么?
比如依赖的jar
2、如何编写自动配置?
以WebMvcAutoConfiguration自动配置为例:
@Configuration @ConditionalOnWebApplication @ConditionalOnClass({ Servlet.class, DispatcherServlet.class, WebMvcConfigurerAdapter.class }) @ConditionalOnMissingBean(WebMvcConfigurationSupport.class) @AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE + 10) @AutoConfigureAfter({ DispatcherServletAutoConfiguration.class, ValidationAutoConfiguration.class }) public class WebMvcAutoConfiguration { public static final String DEFAULT_PREFIX = ""; public static final String DEFAULT_SUFFIX = "";
@Configuration指定这是一个配置类
@ConditionalOnXXX 在指定条件成立的情况下自动配置类生效
自动装配顺序
在特定自动装配Class之前 @AutoConfigureBefore
在特定自动装配Class之后@AutoConfigureAfter
指定顺序@AutoConfigureOrder
@Bean 给容器中添加组件
@ConfigurationPropertie结合相关xxxProperties类来绑定相关的配置
@ConfigurationProperties(prefix = "spring.mvc") public class WebMvcProperties { }
@EnableConfigurationProperties 让xxxProperties生效加入到容器中
@Configuration @Import(EnableWebMvcConfiguration.class) @EnableConfigurationProperties({ WebMvcProperties.class, ResourceProperties.class }) public static class WebMvcAutoConfigurationAdapter extends WebMvcConfigurerAdapter { }
配置自动装配Bean:
自动配置类要能加载
将需要启动就加载的自动配置类,将标注@Configuration的自动配置类配置在META‐INF/spring.factories下,自动配置类就会生效
# Auto Configure org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\ org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
3、模式
启动器(starter)
启动器只用来做依赖导入
专门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(starters)
mybatis-spring-boot-starter 自定义启动器名 -spring-boot-starter
二、自定义Starters
构建项目:
1.先创建一个空工程
2、创建两个模块分别是启动器starter的maven模块和spring的初始化器创建的自动配置模块
启动器maven模块
自定义的starters
spring的初始化器创建模块(创建自动配置相关的模块)
三、代码步骤
在启动器starter的pom文件中引入配置类的坐标ming-spring-boot-starter-autoconfigurer
<?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.ming.springboot</groupId> <artifactId>ming-spring-boot-starter</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>com.ming.springboot</groupId> <artifactId>ming-spring-boot-starter-autoconfigurer</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </project>
写一个打招呼的功能
package com.ming.springboot; /** * 打招呼的 * */ public class HelloService { HelloProperties helloProperties; public HelloProperties getHelloProperties() { return helloProperties; } public void setHelloProperties(HelloProperties helloProperties) { this.helloProperties = helloProperties; } public String sayHello(String name){ return helloProperties.getPrefix()+"-"+name+helloProperties.getSuffix(); } }
HelloProperties 和Helloservice 进行属性绑定的
package com.ming.springboot; import org.springframework.boot.context.properties.ConfigurationProperties; @ConfigurationProperties(prefix = "com.ming") 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; } }
自动配置类
package com.ming.springboot; 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 helloService = new HelloService(); helloService.setHelloProperties(helloProperties); return helloService; } }
然后将这两个模块安装到maven仓库中
先安装配置模块因为starter模块依赖配置模块,别人调用我们的starter模块就行了
然后将启动器starter也装到仓库中,别人就可以用坐标引入了
在别的项目中引入自定义的启动器starter
<!--引入自定义的starter--> <dependency> <groupId>com.ming.springboot</groupId> <artifactId>ming-spring-boot-starter</artifactId> <version>1.0-SNAPSHOT</version> </dependency>
配置application.properties
#自定义启动器starter com.ming.prefix=一起学习 com.ming.suffix=你学费了吗
测试
@Autowired HelloService helloService; @Test public void starterTest(){ String sayHello = helloService.sayHello("自定义starter"); System.out.println(sayHello); }
加载全部内容