• Tag Archives: redis

当在SpringBoot使用Redis的Session共享功能时，@EnableScheduling始终生效的问题。

我在调试项目的redis共享时，遇到了这种情况：

当我需要使用Redis来管理SpringBoot的Session时，会加入如下依赖：

		<dependency>
			<groupId>org.springframework.session</groupId>
			<artifactId>spring-session-data-redis</artifactId>
		</dependency>

这个依赖会让启动类中的@EnableScheduling设定无效，就是说，此时无论有没有@EnableScheduling，系统中的所有定时器均会生效。

唉~具体原因，我猜是因为这个功能需要用到定时器，所以会默认开启了呗~折腾了我半天，真浪费时间~

SpringBoot利用Redis对session进行共享

1、引入pom依赖包

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

2、配置application.application

# spring session使用存储类型
spring.session.store-type=redis

#配置redis集群

spring.redis.cluster.nodes=192.168.1.55:7000,192.168.1.53:7003

3、启动类中增加@EnableRedisHttpSession

4、使用
request.getSession().setAttribute(“username”, “admin”);
String userName = (String) request.getSession().getAttribute(“username”);

SpringBoot2+JPA引入对Redis的支持

在pom.xml加入：

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

增加配置文件RedisConfig.java：

package com.zero4j.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.interceptor.KeyGenerator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;

import java.lang.reflect.Method;

/**
 * Redis 缓存配置类（通用）
 * @author linhongcun
 *
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    /**
     * 缓存对象集合中，缓存是以 key-value 形式保存的。当不指定缓存的 key 时，SpringBoot 会使用 SimpleKeyGenerator 生成 key。
     * @return
     */
    @Bean
    public KeyGenerator wiselyKeyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... params) {
                StringBuilder sb = new StringBuilder();
                sb.append(target.getClass().getName());
                sb.append(method.getName());
                for (Object obj : params) {
                    sb.append(obj.toString());
                }
                return sb.toString();
            }
        };

    }

    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
    	return RedisCacheManager.create(factory);
    }

    @Bean
    public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        @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);
        template.afterPropertiesSet();
        return template;
    }
}

在application.properties中加入：

# Redis
spring.redis.host=127.0.0.1
spring.redis.port=6379

对Service类加入注解@CacheConfig和@Cacheable，如：

package com.zero4j.model.config;

import java.util.List;

import org.springframework.cache.annotation.CacheConfig;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;

@Repository
@CacheConfig(cacheNames = "configRepository")
public interface ConfigRepository extends JpaRepository<Config, String> {

	@Query("SELECT config FROM Config config")
	@Cacheable(value = "findAll",keyGenerator="wiselyKeyGenerator")
	List<Config> findAll();
	
}

 

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