七、SpringBoot的自动装配应用案例练习（结合Redis）

7.1、案例描述

• 需求
  • 自定义redis-starter。要求当导入redis坐标时，SpringBoot自动创建Jedis的Bean

7.2、案例实现

7.2.1、实现步骤

• 1、创建工程导入依赖

  • <?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>org.coolman</groupId>
        <artifactId>SpringBoot-Redis-Test</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
        <parent>
            <artifactId>spring-boot-parent</artifactId>
            <groupId>org.springframework.boot</groupId>
            <version>2.5.0</version>
        </parent>
    
        <!--依赖管理-->
        <dependencies>
            <!--导入Spring的容器-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <!--导入jedis-->
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
                <version>2.9.3</version>
            </dependency>
    
            <!--SpringBoot测试启动器-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
    
            <!--lombok-->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
        </dependencies>
    </project>
    

• 2、编写jedis属性配置类

  • package com.coolman.config;
    import lombok.Data;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    
    @ConfigurationProperties("myredis")
    @Data
    public class RedisProperties {
    
        private Integer port;
    
        private String host;
    }
    

• 3、编写application.yml，编写redis的配置属性

  • myredis:
      host: 127.0.0.1
      port: 6379
    

• 4、编写jedis自动配置类

  • package com.coolman.config;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.context.properties.EnableConfigurationProperties;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import redis.clients.jedis.Jedis;
    
    @EnableConfigurationProperties(RedisProperties.class)   //加载 redis属性配置
    @Configuration  //声明是一个配置类
    public class RedisConfiguration {
    
        @Autowired
        private RedisProperties redisProperties;
    
        @Bean
        public Jedis getJedis(){
            return new Jedis(redisProperties.getHost(), redisProperties.getPort());
        }
    }
    

• 5、执行测试案例

  • package com.coolman;
    
    import lombok.extern.slf4j.Slf4j;
    import org.junit.jupiter.api.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import redis.clients.jedis.Jedis;
    
    @Slf4j
    @SpringBootTest
    public class AppTest {
    
        @Autowired
        private Jedis jedis;
    
        @Test
        public void test01() {
            jedis.set("name", "coolman");
    
            log.info("从redis读取到的数据：" + jedis.get("name"));
        }
    
    }
    
    

• 测试结果

  • 

7.3、总结

• 自定义启动器的步骤
  • ①、导入依赖
  • ②、编写属性配置类
  • ③、编写application.yaml配置文件，编写redis的配置属性
  • ④、编写自动配置类