SpringBoot学习(2) - 自定义starter

自己开发一个spring boot starter的步骤
1.新建一个项目（全部都基于maven），比如新建一个spring-boot-starter-redis的maven项目

pom.xml:

 <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.study.spring-boot</groupId>

     <artifactId>spring-boot-starter-redis</artifactId>

     <version>1.0.0</version>

     <packaging>jar</packaging>

     <name>spring-boot-starter-redis</name>

     <url>http://maven.apache.org</url>

     <properties>

         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

     </properties>

     <dependencies>

         <dependency>

             <groupId>org.springframework.boot</groupId>

             <artifactId>spring-boot-starter</artifactId>

             <version>1.5.3.RELEASE</version>

         </dependency>

         <dependency>

             <groupId>redis.clients</groupId>

             <artifactId>jedis</artifactId>

             <version>2.9.0</version>

         </dependency>

         <dependency>

             <groupId>junit</groupId>

             <artifactId>junit</artifactId>

             <version>3.8.1</version>

             <scope>test</scope>

         </dependency>

     </dependencies>

 </project>

2.需要一个配置类，配置类里面需要装配好需要提供出去的类

配置类：

 package com.study.spring_boot_redis;

 import org.springframework.boot.context.properties.ConfigurationProperties;

 @ConfigurationProperties(prefix="redis")

 public class RedisProperties {

     private String host;

     private Integer port;

     public String getHost() {

         return host;

     }

     public void setHost(String host) {

         this.host = host;

     }

     public Integer getPort() {

         return port;

     }

     public void setPort(Integer port) {

         this.port = port;

     }

 }

 package com.study.spring_boot_redis;

 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;

 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;

 import org.springframework.boot.context.properties.EnableConfigurationProperties;

 import org.springframework.context.annotation.Bean;

 import org.springframework.context.annotation.Configuration;

 import redis.clients.jedis.Jedis;

 @Configuration

 @ConditionalOnClass(Jedis.class)

 @EnableConfigurationProperties(RedisProperties.class)

 public class RedisAutoConfiguration {

     @Bean

     @ConditionalOnMissingBean

     public Jedis Jedis(RedisProperties redisProperties) {

         return new Jedis(redisProperties.getHost(),redisProperties.getPort());

     }

 }

3.
(1)使用@Enable，使用@Import导入需要装配的类

Enable注解：

 package com.study.spring_boot_redis;

 import java.lang.annotation.Documented;

 import java.lang.annotation.ElementType;

 import java.lang.annotation.Retention;

 import java.lang.annotation.RetentionPolicy;

 import java.lang.annotation.Target;

 import org.springframework.context.annotation.Import;

 @Target(ElementType.TYPE)

 @Retention(RetentionPolicy.RUNTIME)

 @Documented

 @Import(RedisAutoConfiguration.class)

 public @interface EnableRedis {

 }

(2)/META-INF/spring.factories，在org.springframework.boot.autoconfigure.EnableAutoConfiguration配置需要装配的类

/spring-boot-starter-redis/src/main/resources/META-INF/spring.factories：

 org.springframework.boot.autoconfigure.EnableAutoConfiguration = com.study.spring_boot_redis.RedisAutoConfiguration

真正的项目：springbootstarter（maven项目）

pom.xml:

 <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.study.springboot</groupId>

     <artifactId>springboot</artifactId>

     <version>1.0.0</version>

     <packaging>jar</packaging>

     <name>springboot</name>

     <url>http://maven.apache.org</url>

     <properties>

         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

     </properties>

     <dependencyManagement>

         <dependencies>

             <dependency>

                 <groupId>org.springframework.boot</groupId>

                 <artifactId>spring-boot-dependencies</artifactId>

                 <version>1.5.3.RELEASE</version>

                 <scope>import</scope>

                 <type>pom</type>

             </dependency>

         </dependencies>

     </dependencyManagement>

     <dependencies>

         <dependency>

             <groupId>com.study.spring-boot</groupId>

             <artifactId>spring-boot-starter-redis</artifactId>

             <version>1.0.0</version>

         </dependency>

         <dependency>

             <groupId>junit</groupId>

             <artifactId>junit</artifactId>

             <scope>test</scope>

         </dependency>

     </dependencies>

 </project>

/springbootstarter/src/main/resources/application.properties:

 redis.host=127.0.0.1

 redis.port=6379

 //@EnableRedis

 @SpringBootApplication

 public class App {

     public static void main(String[] args) {

         ConfigurableApplicationContext context = SpringApplication.run(App.class,args);

         Jedis jedis = context.getBean(Jedis.class);

         jedis.set("id", "root123");

         System.out.println(jedis.get("id"));

         context.close();

     }

 }

巴特西

SpringBoot学习(2) - 自定义starter

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