What is the default serialization method for modifying Springsession redis?

一、配置Spring-session-redis 的关键配置如下：

    <!-- 设置Cookie domain 和 名称 -->
    <bean id="defaultCookieSerializer" class="org.springframework.session.web.http.DefaultCookieSerializer">
        <property name="domainName" value="${sso.cookie.domain}"/>
        <property name="cookieName" value="${sso.cookie.name}"/>
        <property name="cookieMaxAge" value="${sso.cookie.maxage}" />
        <property name="cookiePath" value="${sso.cookie.path}" />
        <!--<property name="domainNamePattern" value="^.+?\\.(\\w+\\.[a-z]+)$"/>-->
    </bean>

	<!-- 配置spring session -->
	<bean class="org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration">
		<!-- session超时设置 -->
		<property name="maxInactiveIntervalInSeconds" value="${spring.session.expiration}" />
        <property name="cookieSerializer" ref="defaultCookieSerializer" />
	</bean>

二、查看 RedisHttpSessionConfiguration 源代码如下：

	@Bean
	public RedisTemplate<Object, Object> sessionRedisTemplate(
			RedisConnectionFactory connectionFactory) {
		RedisTemplate<Object, Object> template = new RedisTemplate<Object, Object>();
		template.setKeySerializer(new StringRedisSerializer());
		template.setHashKeySerializer(new StringRedisSerializer());
		if (this.defaultRedisSerializer != null) {
			template.setDefaultSerializer(this.defaultRedisSerializer);
		}
		template.setConnectionFactory(connectionFactory);
		return template;
	}

	@Bean
	public RedisOperationsSessionRepository sessionRepository(
			@Qualifier("sessionRedisTemplate") RedisOperations<Object, Object> sessionRedisTemplate,
			ApplicationEventPublisher applicationEventPublisher) {
		RedisOperationsSessionRepository sessionRepository = new RedisOperationsSessionRepository(
				sessionRedisTemplate);
		sessionRepository.setApplicationEventPublisher(applicationEventPublisher);
		sessionRepository
				.setDefaultMaxInactiveInterval(this.maxInactiveIntervalInSeconds);
		if (this.defaultRedisSerializer != null) {
			sessionRepository.setDefaultSerializer(this.defaultRedisSerializer);
		}

		String redisNamespace = getRedisNamespace();
		if (StringUtils.hasText(redisNamespace)) {
			sessionRepository.setRedisKeyNamespace(redisNamespace);
		}

		sessionRepository.setRedisFlushMode(this.redisFlushMode);
		return sessionRepository;
	}

创建RedisTemplate时，指定的默认序列化是：StringRedisSerializer，当 defaultRedisSerializer != null 时，重新指定了序列化方法。以下是 defaultRedisSerializer 的初始化代码：

	@Autowired(required = false)
	@Qualifier("springSessionDefaultRedisSerializer")
	public void setDefaultRedisSerializer(
			RedisSerializer<Object> defaultRedisSerializer) {
		this.defaultRedisSerializer = defaultRedisSerializer;
	}

因此，我们只需要创建名为 springSessionDefaultRedisSerializer 的Bean，及可修改默认序列化方法。

<bean id="springSessionDefaultRedisSerializer" class="org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer" />

注：使用JSON序列化，在特定的场景，会报错，谨慎使用。

三、RedisTemplate 初始化代码如下：

	public void afterPropertiesSet() {

		super.afterPropertiesSet();

		boolean defaultUsed = false;

		if (defaultSerializer == null) {

			defaultSerializer = new JdkSerializationRedisSerializer(
					classLoader != null ? classLoader : this.getClass().getClassLoader());
		}

		if (enableDefaultSerializer) {

			if (keySerializer == null) {
				keySerializer = defaultSerializer;
				defaultUsed = true;
			}
			if (valueSerializer == null) {
				valueSerializer = defaultSerializer;
				defaultUsed = true;
			}
			if (hashKeySerializer == null) {
				hashKeySerializer = defaultSerializer;
				defaultUsed = true;
			}
			if (hashValueSerializer == null) {
				hashValueSerializer = defaultSerializer;
				defaultUsed = true;
			}
		}

		if (enableDefaultSerializer && defaultUsed) {
			Assert.notNull(defaultSerializer, "default serializer null and not all serializers initialized");
		}

		if (scriptExecutor == null) {
			this.scriptExecutor = new DefaultScriptExecutor<K>(this);
		}

		initialized = true;
	}

从句式和语序上调整，可将原话重写为："如果未指定默认值，使用JdkSerializationRedisSerializer。"。

特别提醒：如果已有session中存在旧有的序列化值，更换序列化方法后，要删除旧值，使用新的序列化进行调试，否则会报序列化错误。

特别提醒：如果已有session中存在旧有的序列化值，更换序列化方法后，要删除旧值，使用新的序列化进行调试，否则会报序列化错误。

The above is the detailed content of What is the default serialization method for modifying Springsession redis?. For more information, please follow other related articles on the PHP Chinese website!