spring-data-redis提供了多种serializer策略,这对使用jedis的开发者而言,实在是非常便捷。sdr提供了4种内置的serializer:
- JdkSerializationRedisSerializer:使用JDK的序列化手段(serializable接口,ObjectInputStrean,ObjectOutputStream),数据以字节流存储
- StringRedisSerializer:字符串编码,数据以string存储
- JacksonJsonRedisSerializer:json格式存储
- OxmSerializer:xml格式存储
其中JdkSerializationRedisSerializer和StringRedisSerializer是最基础的序列化策略,其中“JacksonJsonRedisSerializer”与“OxmSerializer”都是基于stirng存储,因此它们是较为“高级”的序列化(最终还是使用string解析以及构建java对象)。
RedisTemplate中需要声明4种serializer,默认为“JdkSerializationRedisSerializer”:
1) keySerializer :对于普通K-V操作时,key采取的序列化策略
2) valueSerializer:value采取的序列化策略
3) hashKeySerializer: 在hash数据结构中,hash-key的序列化策略
4) hashValueSerializer:hash-value的序列化策略
无论如何,建议key/hashKey采用StringRedisSerializer。
接下来,通过实例描述如何使用它们,可以首先参考“spring-data-redis特性”:
一. JdkSerializationRedisSerializer/StringRedisSerializer
1) spring配置文件
<bean id="jedisTemplate" class="org.springframework.data.redis.core.RedisTemplate"> <property name="connectionFactory" ref="jedisConnectionFactory"></property> <property name="keySerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <property name="hashKeySerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> <property name="valueSerializer"> <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/> </property> <property name="hashValueSerializer"> <bean class="org.springframework.data.redis.serializer.JdkSerializationRedisSerializer"/> </property> </bean>
2) 程序实例:
ValueOperations<String, User> valueOper = redisTemplate.opsForValue(); User user = new User("zhangsan",12); valueOper.set("user:1", user); System.out.println(valueOper.get("user:1").getName());
其中User为pojo类,且需要实现Serializable接口。
二.sdr与json
1) spring配置:
<bean id="jsonSerializer" class="com.sample.redis.sdr.JsonRedisSerializer"/> <bean id="jedisTemplate" class="org.springframework.data.redis.core.RedisTemplate"> <property name="connectionFactory" ref="jedisConnectionFactory"></property> <property name="defaultSerializer"> <bean class="org.springframework.data.redis.serializer.StringRedisSerializer"/> </property> </bean>
并没有在配置文件中,使用JacksonJsonRedisSerializer,因为这样实在是麻烦而且不灵活(主要是jackson需要ClassType)。我们将在java代码进行转换,因为通过java代码,使用jackson工具将json字符串转换成javabean是非常简单的。
2) 程序实例:
/** * 不使用sdr自带的json序列化工具,一切操作基于string **/ public class JsonRedisSeriaziler{ public static final String EMPTY_JSON = "{}"; public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8"); protected ObjectMapper objectMapper = new ObjectMapper(); public JsonRedisSeriaziler(){} /** * java-object as json-string * @param object * @return */ public String seriazileAsString(Object object){ if (object== null) { return EMPTY_JSON; } try { return this.objectMapper.writeValueAsString(object); } catch (Exception ex) { throw new SerializationException("Could not write JSON: " + ex.getMessage(), ex); } } /** * json-string to java-object * @param str * @return */ public <T> T deserializeAsObject(String str,Class<T> clazz){ if(str == null || clazz == null){ return null; } try{ return this.objectMapper.readValue(str, clazz); }catch (Exception ex) { throw new SerializationException("Could not write JSON: " + ex.getMessage(), ex); } } }
public class RedisClientTest { private JsonRedisSeriaziler seriaziler; private RedisTemplate redisTemplate; public void setSeriaziler(JsonRedisSeriaziler seriaziler) { this.seriaziler = seriaziler; } public void setRedisTemplate(RedisTemplate redisTemplate) { this.redisTemplate = redisTemplate; } public void insertUser(User user){ ValueOperations<String, String> operations = redisTemplate.opsForValue(); operations.set("user:" + user.getName(), seriaziler.seriazileAsString(user)); } public User getUser(String name){ ValueOperations<String, String> operations = redisTemplate.opsForValue(); String json = operations.get("user:" + name); return seriaziler.deserializeAsObject(json, User.class); } }
三.sdr与xml
实施办法可以参见本文“sdr与json”,同时参考spring-oxm相关文档。
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