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

Web Services

spring.webservices.wsdl-locations=classpath:/wsdl

参考资料：

https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#io