Spring Boot(五十二)：自动装配之自定义starter实现

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需求

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

实现步骤

1 项目结构如下

2 创建 redis-spring-boot-autoconfigure 模块

<dependency>
    <groupId>redis.clients</groupId>
    <artifactId>jedis</artifactId>
</dependency>

3 创建redis-spring-boot-starte模块依赖redis-spring-boot-autoconfigure的模块

        <dependency>
            <groupId>com.example</groupId>
            <artifactId>autoconfigure</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

4 在redis-spring-boot-autoconfigure模块中初始化Jedis的Bean。并定义META-INF/spring.factories 文件

package com.example.redis.config;

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

@ConfigurationProperties(prefix = "redis")
public class RedisProperties {
    private String host = "localhost";
    private int port = 6379;

    private String password ="123456";


    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

package com.example.redis.config;

import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
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
@EnableConfigurationProperties(RedisProperties.class)
@ConditionalOnClass(Jedis.class)
public class RedisAutoConfiguration {
    /**
     * 提供Jedis的bean
     */
    @Bean
    @ConditionalOnMissingBean(name = "jedis")
    public Jedis jedis(RedisProperties redisProperties) {
        System.out.println("RedisAutoConfiguration....");
        Jedis jedis = new Jedis(redisProperties.getHost(), redisProperties.getPort());
        jedis.auth(redisProperties.getPassword());
        return jedis;
    }
}

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  com.example.redis.config.RedisAutoConfiguration

5 在测试spring-boot-jedis模块中引入自定义的redis-starter依赖测试获取Jedis的Bean操作redis。

        <dependency>
            <groupId>com.example</groupId>
            <artifactId>starter</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

配置文件

spring.redis.port=6379
spring.redis.host=192.168.222.131
spring.redis.password=123456

package com.example.jedis;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import redis.clients.jedis.Jedis;

@SpringBootApplication
public class SpringbootJedisApplication {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(SpringbootJedisApplication.class, args);

        Jedis jedis = context.getBean(Jedis.class);
        System.out.println(jedis);

        jedis.set("name","itcast");

        String name = jedis.get("name");
        System.out.println(name);

    }

}