Spring Boot扩展机制 - Spring Factories

十毛

发布于 2020-09-17 16:11:07

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代码可运行

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代码可运行

Spring Boot使用的时候，有时候为业务方提供一些基础服务，比如监控，告警等，为了降低业务接入难度，就需要使用Spring Factories扩展机制

使用方式

启动类：com.tenmao.FactoriesApplication

@SpringBootApplication
public class FactoriesApplication implements ApplicationRunner {

    @Resource
    private UserManager userManager;

    public static void main(String[] args) {
        SpringApplication.run(FactoriesApplication.class, args);
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        System.out.println(userManager.getName());
    }
}

配置类：com.shimao.ShimaoAuthConfiguration

@Configuration
public class ShimaoAuthConfiguration {
    @Bean
    public UserManager userManager() {
        return new UserManager();
    }
}

扩展配置：META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.shimao.ShimaoAuthConfiguration

shardingsphere扩展

org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration

@Configuration
@EnableConfigurationProperties({
        SpringBootShardingRuleConfigurationProperties.class, 
        SpringBootMasterSlaveRuleConfigurationProperties.class, SpringBootEncryptRuleConfigurationProperties.class, SpringBootPropertiesConfigurationProperties.class})
@ConditionalOnProperty(prefix = "spring.shardingsphere", name = "enabled", havingValue = "true", matchIfMissing = true)
@AutoConfigureBefore(DataSourceAutoConfiguration.class)
@RequiredArgsConstructor
public class SpringBootConfiguration implements EnvironmentAware {
    //忽略了其他
}

spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration

其他常见第三方库

这些库都用到Spring Factories扩展机制

sharding-jdbc-spring-boot-starte
mybatis-plus-boot-starter
redisson

其他扩展点

Sprig Boot扩展

# Auto Configure（这个扩展是使用的最多的，特别是是一些公共SDK，会这借助这扩展实现Bean的自动注入）
org.springframework.boot.autoconfigure.EnableAutoConfiguration

# PropertySource Loaders
org.springframework.boot.env.PropertySourceLoader

# Run Listeners
org.springframework.boot.SpringApplicationRunListener

# Error Reporters
org.springframework.boot.SpringBootExceptionReporter

# Application Context Initializers
org.springframework.context.ApplicationContextInitializer

# Application Listeners
org.springframework.context.ApplicationListener

# Environment Post Processors
org.springframework.boot.env.EnvironmentPostProcessor

# Failure Analyzers
org.springframework.boot.diagnostics.FailureAnalyzer

# FailureAnalysisReporters
org.springframework.boot.diagnostics.FailureAnalysisReporter