SpringBoot使用NoSQL——Redis的使用

Spring Boot提供Redis，MongoDB，Neo4j，Elasticsearch，Solr Cassandra，Couchbase和LDAP的自動配置; 如果你要想使用其他nosql技術，需要自己參考“https://projects.spring.io/spring-data/”的文檔。

使用redis

Redis是一個緩存，消息代理和功能豐富的鍵值對存儲。Spring Boot為Jedis客戶端庫和Spring Data Redis提供自動配置和抽象類 。項目需依賴“spring-boot-starter-data-redis”的Starter。使用的時候在bean中注入RedisConnectionFactory，StringRedisTemplate或者RedisTemplate的實例即可，字符串操作推薦使用StringRedisTemplate其他類型推薦使用RedisTemplate。沒有配置redis鏈接地址的情況下默認為localhost:6379。

pom依賴

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

redis配置

import java.lang.reflect.Method;
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 org.springframework.data.redis.serializer.StringRedisSerializer;
import com.fasterxml.jackson.annotation.JsonAutoDetect.Visibility;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    @Bean
    public KeyGenerator keyGenerator() {
        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(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {
        RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
        // 失效時間(秒)，默認不失效
        cacheManager.setDefaultExpiration(60);
        return cacheManager;
    }
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<Object, Object>();
        redisTemplate.setConnectionFactory(factory);
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setValueSerializer(buildJackson2JsonRedisSerializer());
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }
    @Bean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate stringRedisTemplate = new StringRedisTemplate(factory);
        stringRedisTemplate.setDefaultSerializer(new StringRedisSerializer());
        stringRedisTemplate.afterPropertiesSet();
        return stringRedisTemplate;
    }
    private Jackson2JsonRedisSerializer<Object> buildJackson2JsonRedisSerializer() {
        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        return jackson2JsonRedisSerializer;
    }
}

注入

@RunWith(SpringJUnit4Cla***unner.class)
@SpringBootTest(classes = Application.class)
public class RedisTemplateTest {
    @Resource
    private RedisTemplate<String, Object> redisTemplate;
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    ......
}