【Spring】SpringBoot官方笔记7IO¶
Caching¶
Spring Boot auto-configures the cache infrastructure as long as caching
support is enabled by using the @EnableCaching annotation.
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Component;
@Component
public class MyMathService {
@Cacheable("piDecimals")
public int computePiDecimal(int precision) {
...
}
}
Before invoking computePiDecimal, the abstraction looks for an entry
in the piDecimals cache that matches the i argument. If an entry
is found, the content in the cache is immediately returned to the
caller, and the method is not invoked. Otherwise, the method is invoked,
and the cache is updated before returning the value.
Redis¶
If Redis is available and configured,
a RedisCacheManager is auto-configured.
spring.cache.cache-names=cache1,cache2
spring.cache.redis.time-to-live=10m
import java.time.Duration;
import org.springframework.boot.autoconfigure.cache.RedisCacheManagerBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
@Configuration(proxyBeanMethods = false)
public class MyRedisCacheManagerConfiguration {
@Bean
public RedisCacheManagerBuilderCustomizer myRedisCacheManagerBuilderCustomizer() {
return (builder) -> builder
.withCacheConfiguration("cache1", RedisCacheConfiguration
.defaultCacheConfig().entryTtl(Duration.ofSeconds(10)))
.withCacheConfiguration("cache2", RedisCacheConfiguration
.defaultCacheConfig().entryTtl(Duration.ofMinutes(1)));
}
}
If you need to disable caching altogether in certain environments, force
the cache type to none to use a no-op implementation, as shown in
the following example:
spring.cache.type=none
Sending Email¶
The Spring Framework provides an abstraction for sending email by using
the JavaMailSender interface, and Spring Boot provides
auto-configuration for it as well as a starter module.
spring.mail.properties[mail.smtp.connectiontimeout]=5000
spring.mail.properties[mail.smtp.timeout]=3000
spring.mail.properties[mail.smtp.writetimeout]=5000