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在SpringBoot中添加Redis及配置方法

更新時(shí)間：2018年10月15日 11:04:06 作者：detectiveHLH

這篇文章主要介紹了在SpringBoot中添加Redis及配置redis的代碼,需要的朋友可以參考下

在實(shí)際的開發(fā)中，會(huì)有這樣的場(chǎng)景。有一個(gè)微服務(wù)需要提供一個(gè)查詢的服務(wù)，但是需要查詢的數(shù)據(jù)庫表的數(shù)據(jù)量十分龐大，查詢所需要的時(shí)間很長(zhǎng)。此時(shí)就可以考慮在項(xiàng)目中加入緩存。

引入依賴

在maven項(xiàng)目中引入如下依賴。并且需要在本地安裝redis。

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-data-redis</artifactId>
  <version>2.0.5.RELEASE</version>
</dependency>

配置redis

在SpringBoot的配置文件中添加如下代碼。

redis:
  host: 127.0.0.1
  port: 6379
  timeout: 5000
  database: 0
  jedis:
   pool:
    max-idle: 8
    max-wait:
    min-idle: 0

添加redis配置文件

新建名為RedisConfig的配置類。

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.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCacheWriter;
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.time.Duration;

/**
 * RedisConfig
 *
 * @author detectiveHLH
 * @date 2018-10-11 14:39
 **/
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
  @Bean
  @Override
  public KeyGenerator keyGenerator() {
    return (target, method, 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 RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory) {
    ObjectMapper om = new ObjectMapper();
    om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
    om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
    //redis序列化
    Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
    jackson2JsonRedisSerializer.setObjectMapper(om);

    StringRedisTemplate template = new StringRedisTemplate(factory);
    template.setValueSerializer(jackson2JsonRedisSerializer);
    template.afterPropertiesSet();
    return template;
  }

  /**
   * 自定義CacheManager
   */
  @Bean
  public CacheManager cacheManager(RedisTemplate redisTemplate) {
    //全局redis緩存過期時(shí)間
    RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig().entryTtl(Duration.ofDays(1));
    RedisCacheWriter redisCacheWriter = RedisCacheWriter.nonLockingRedisCacheWriter(redisTemplate.getConnectionFactory());
    return new RedisCacheManager(redisCacheWriter, redisCacheConfiguration);
  }
}

添加緩存配置

在項(xiàng)目的service層中的實(shí)現(xiàn)類中，添加@Cacheable注解。

import java.util.HashMap;

/**
 * UserLoginServiceImpl
 *
 * @author detectiveHLH
 * @date 2018-10-10 17:20
 **/
@Service
public class UserLoginServiceImpl implements UserLoginService {
  @Autowired
  private UserLoginMapper userLoginMapper;

  @Override
  @Cacheable(value = "usercache")
  public HashMap getByUserName(String userName) {
    System.out.println("此時(shí)沒有走緩存");
    return userLoginMapper.getByUserName(userName);
  }
}

然后調(diào)用一次該接口。就可以在redis中看到如下的key。