springboot 缓存添加redis缓存支持

1.添加maven支持

<!-- springboot cache -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-cache</artifactId>
</dependency>

<!-- redis -->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

<!-- shiro-redis -->
<dependency>
	<groupId>org.crazycake</groupId>
	<artifactId>shiro-redis</artifactId>
	<version>2.4.2.1-RELEASE</version>
</dependency>

2.配置redis环境参数

# Redis数据库索引（默认为0）
spring.redis.database=0
# Redis服务器地址
spring.redis.host=127.0.0.1
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空）
spring.redis.password=
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.jedis.pool.max-active=1000
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.jedis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.jedis.pool.max-idle=10
# 连接池中的最小空闲连接
spring.redis.jedis.pool.min-idle=2
# 连接超时时间（毫秒）
spring.redis.timeout=5000

3.配置redis缓存

/**
 * describe: Redis 配置类
 * current user Maochao.zhu
 * current system 2020/6/18
 */
@Configuration
public class RedisConfig extends CachingConfigurerSupport {

    // 自定义缓存key生成策略
    @Bean
    public KeyGenerator keyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, java.lang.reflect.Method method, Object... params) {
                StringBuffer sb = new StringBuffer();
                sb.append(target.getClass().getName()).append(".");
                sb.append(method.getName());
                for (Object obj : params) {
                    if(null!=obj){
                        sb.append(".");
                        sb.append(obj.toString());
                    }
                }
                return sb.toString();
            }
        };
    }

    // 管理缓存
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofHours(1))// 设置缓存有效期一小时
                // 设置 key为string序列化
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                // 设置value为json序列化
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new GenericJackson2JsonRedisSerializer()))
                // 不缓存空值
                .disableCachingNullValues();
        return RedisCacheManager
                .builder( RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
                .cacheDefaults(redisCacheConfiguration).build();
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate stringRedisTemplate = new StringRedisTemplate(factory);
        setSerializer(stringRedisTemplate);// 设置序列化工具
        stringRedisTemplate.afterPropertiesSet();
        return stringRedisTemplate;
    }

    private void setSerializer(StringRedisTemplate template) {
        @SuppressWarnings({ "rawtypes", "unchecked" })
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
    }

}

4.Apach Shiro中添加Redis缓存

    @Bean
    public SecurityManager securityManager() {
        DefaultWebSecurityManager defaultSecurityManager = new DefaultWebSecurityManager();
        defaultSecurityManager.setRealm(customRealm());

        defaultSecurityManager.setCacheManager(cacheManager());
        return defaultSecurityManager;
    }

    /**
     * 增加redis 配置
     * @return
     */
    public RedisManager redisManager() {
        RedisManager redisManager = new RedisManager();
        return redisManager;
    }

    public RedisCacheManager cacheManager() {
        RedisCacheManager redisCacheManager = new RedisCacheManager();
        redisCacheManager.setRedisManager(redisManager());
        return redisCacheManager;
    }

5.service中增加缓存注解

@CacheConfig(cacheNames = "menuLeftlist")
public interface MenuService {
	@CacheEvict(allEntries = true) //清除缓存
	public Integer updateMenuById(Menu menu);
	
	@Cacheable(unless = "#result==null")//获取缓存
	public List<Menu> getMenuLeft(String cname);
}

6.Redis下载

下载地址：https://github.com/microsoftarchive/redis/releases

7.存在问题

在获取cacheManager时,springboot1.5版本 和 springboot2.x版本的区别
 #springboot-1.5
	public RedisCacheManager cacheManager() {
		RedisCacheManager redisCacheManager = new RedisCacheManager();
		redisCacheManager.setRedisManager(redisManager());
		return redisCacheManager;
	}
	
 #springboot-2.x 
	    @Bean
    public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofHours(1))// 设置缓存有效期一小时
                .disableCachingNullValues();
        return RedisCacheManager
                .builder( RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
                .cacheDefaults(redisCacheConfiguration).build();
    }

来源：oschina

链接：https://my.oschina.net/u/3204029/blog/4317588