SpringBoot（八）：springboot的自动配置原理

- 日理万妓 2022-05-26 11:55 239阅读 0赞

Spring Boot在进行SpringApplication对象实例化时会加载META-INF/spring.factories文件，将该配置文件中的配置载入到Spring容器。

1.maven下载源码

通过dependency:sources 该命令可以下载该项目中所有的依赖的包的源码。

2.META-INF/spring.factories文件在哪里

spring-boot-1.5.2.RELEASE.jar/META-INF/spring.factories

3.源码分析

org.springframework.boot.SpringApplication：

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org.springframework.core.io.support.SpringFactoriesLoader:

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由此可见，读取该配置文件来加载内容。

4.举例Redis的自动配置

从上述的配置中可以看出，org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration是Redis的自动配置

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Redis在全局文件中的配置

5.条件注解

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# REDIS (RedisProperties)
    spring.redis.cluster.max-redirects= # Maximum number of redirects to follow when executing commands across the cluster.
    spring.redis.cluster.nodes= # Comma-separated list of "host:port" pairs to bootstrap from.
    spring.redis.database=0 # Database index used by the connection factory.
    spring.redis.url= # Connection URL, will override host, port and password (user will be ignored), e.g. redis://user:password@example.com:6379
    spring.redis.host=localhost # Redis server host.
    spring.redis.password= # Login password of the redis server.
    spring.redis.ssl=false # Enable SSL support.
    spring.redis.pool.max-active=8 # Max number of connections that can be allocated by the pool at a given time. Use a negative value for no limit.
    spring.redis.pool.max-idle=8 # Max number of "idle" connections in the pool. Use a negative value to indicate an unlimited number of idle connections.
    spring.redis.pool.max-wait=-1 # Maximum amount of time (in milliseconds) a connection allocation should block before throwing an exception when the pool is exhausted. Use a negative value to block indefinitely.
    spring.redis.pool.min-idle=0 # Target for the minimum number of idle connections to maintain in the pool. This setting only has an effect if it is positive.
    spring.redis.port=6379 # Redis server port.
    spring.redis.sentinel.master= # Name of Redis server.
    spring.redis.sentinel.nodes= # Comma-separated list of host:port pairs.
    spring.redis.timeout=0 # Connection timeout in milliseconds.

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