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https://www.cnblogs.com/gdpuzxs/p/7222309.html
(1)pom.xml引入jar包,如下:
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency>
(2)修改項目啟動類,增加註解@EnableCaching,開啟緩衝功能,如下:
package springboot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cache.annotation.EnableCaching;import org.springframework.scheduling.annotation.EnableScheduling;@SpringBootApplication@EnableScheduling@EnableCachingpublic class SpringbootApplication{ public static void main(String[] args) { SpringApplication.run(SpringbootApplication.class, args); }}
(3)application.properties中配置Redis串連資訊,如下:
# Redis資料庫索引(預設為0)spring.redis.database=0# Redis伺服器位址spring.redis.host=172.31.19.222# Redis伺服器串連連接埠spring.redis.port=6379# Redis伺服器串連密碼(預設為空白)spring.redis.password=# 串連池最大串連數(使用負值表示沒有限制)spring.redis.pool.max-active=8# 串連池最大阻塞等待時間(使用負值表示沒有限制)spring.redis.pool.max-wait=-1# 串連池中的最大空閑串連spring.redis.pool.max-idle=8# 串連池中的最小空閑串連spring.redis.pool.min-idle=0# 連線逾時時間(毫秒)spring.redis.timeout=0
(4)建立Redis緩衝配置類RedisConfig,如下:
package springboot.config;import org.springframework.beans.factory.annotation.Value;import org.springframework.cache.CacheManager;import org.springframework.cache.annotation.CachingConfigurerSupport;import org.springframework.cache.annotation.EnableCaching;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 com.fasterxml.jackson.annotation.JsonAutoDetect;import com.fasterxml.jackson.annotation.PropertyAccessor;import com.fasterxml.jackson.databind.ObjectMapper;/** * Redis緩衝配置類 * @author szekinwin * */@Configuration@EnableCachingpublic class RedisConfig extends CachingConfigurerSupport{ @Value("${spring.redis.host}") private String host; @Value("${spring.redis.port}") private int port; @Value("${spring.redis.timeout}") private int timeout; //自訂緩衝key建置原則// @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());// sb.append(method.getName());// for(Object obj:params){// sb.append(obj.toString());// }// return sb.toString();// }// };// } //緩衝管理器 @Bean public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) { RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate); //設定緩衝到期時間 cacheManager.setDefaultExpiration(10000); return cacheManager; } @Bean public RedisTemplate<String, String> redisTemplate(RedisConnectionFactory factory){ StringRedisTemplate template = new StringRedisTemplate(factory); setSerializer(template);//設定序列化工具 template.afterPropertiesSet(); return template; } 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); }}
(5)建立UserMapper,如下:
package springboot.dao;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.ibatis.annotations.Mapper;import org.apache.ibatis.annotations.Param;import org.apache.ibatis.annotations.Select;import org.apache.ibatis.annotations.Update;import org.springframework.cache.annotation.CacheConfig;import org.springframework.cache.annotation.CacheEvict;import org.springframework.cache.annotation.CachePut;import org.springframework.cache.annotation.Cacheable;import springboot.domain.User;@Mapper@CacheConfig(cacheNames = "users")public interface UserMapper { @Insert("insert into user(name,age) values(#{name},#{age})") int addUser(@Param("name")String name,@Param("age")String age); @Select("select * from user where id =#{id}") @Cacheable(key ="#p0") User findById(@Param("id") String id); @CachePut(key = "#p0") @Update("update user set name=#{name} where id=#{id}") void updataById(@Param("id")String id,@Param("name")String name); //如果指定為 true,則方法調用後將立即清空所有緩衝 @CacheEvict(key ="#p0",allEntries=true) @Delete("delete from user where id=#{id}") void deleteById(@Param("id")String id); }
@Cacheable將查詢結果緩衝到redis中,(key="#p0")指定傳入的第一個參數作為redis的key。
@CachePut,指定key,將更新的結果同步到redis中
@CacheEvict,指定key,刪除快取資料,allEntries=true,方法調用後將立即清除緩衝
(6)service層與controller層跟上一篇整合一樣,啟動redis伺服器,redis伺服器的安裝與啟動可以參考之前的部落格,地址如下:
http://www.cnblogs.com/gdpuzxs/p/6623171.html
(7)配置log4j日誌資訊,如下:
## LOG4J配置log4j.rootCategory=DEBUG,stdout## 控制台輸出log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c{1}:%L - %m%n
(8)驗證redis緩衝
首先我們向user表總插入一條資料,資料庫顯示如下:
現在,我們查詢一下user表中id=24的資料,觀擦控制台輸出的資訊,如下:
通過控制台輸出資訊我們可以知道,這次執行了資料庫查詢,並開啟了Redis緩衝查詢結果。接下來我們重新查詢user表中id=24的資料,觀察控制台,如下:
通過控制台輸出資訊我們可以知道,這次並沒有執行資料庫查詢,而是從Redis緩衝中查詢,並返回查詢結果。我們查看redis中的資訊,如下:
方法finduser方法使用了註解@Cacheable(key="#p0"),即將id作為redis中的key值。當我們更新資料的時候,應該使用@CachePut(key="#p0")進行快取資料的更新,否則將查詢到髒資料。
spring boot 使用redis緩衝