springboot系列十四、自定义实现starter
一、starter的作用
当我们实现了一个组建,希望尽可能降低它的介入成本,一般的组建写好了,只要添加spring扫描路径加载spring就能发挥作用。有个更简单的方式扫描路径都不用加,直接引入jar就能使用。
原理时因为springboot提供一个配置文件 spring.factories,预定好了加载那个配置类。
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.xjw.HelloAutoConfiguration
二、自定义实现starter
1、创建pom文件
<?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> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>generateCode-starter</artifactId> <version>0.0.1-SNAPSHOT</version> <name>generateCode-starter</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <scope>provided</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> <configuration> <fork>true</fork> </configuration> </plugin> </plugins> </build> </project>
2、创建配置类
package com.starter.demo; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class GeneraterConfig { @Bean GeneraterIdService getGeneraterIdService(){ return new GeneraterIdService(); } }
3、组建类:GeneraterIdService.java
package com.starter.demo; import java.util.Date; public class GeneraterIdService { public String generaterId(){ return new Date().getTime()+""; } }
4、spring.factories文件
路径:resources/META-INF/spring.factories
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.starter.demo.GeneraterConfig
三、打包测试
1、引入
<dependency> <groupId>com.example</groupId> <artifactId>generateCode-starter</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency>
2、使用测试
@RunWith(SpringRunner.class) @SpringBootTest @WebAppConfiguration public class RestTemplateTest { @Autowired GeneraterIdService generaterIdService; @Test public void TestGeneraterId(){ System.out.println(generaterIdService.generaterId()); } }