以下是Spring session redis修改默认的序列化方法的完整攻略:
简介
Spring Session是Spring官方提供的一个用于对Session进行管理的解决方案,可以将Session的数据存储在各种数据源中,其中就包括Redis。Spring Session Redis提供了一种默认的序列化方式,但是如果要修改默认的序列化方式,就需要进行一些额外的配置。
步骤
- 添加Redis依赖
使用Spring Session Redis需要添加Spring Data Redis依赖。在Maven项目中,可以在pom.xml文件中添加以下依赖:
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-redis</artifactId>
<version>2.5.0</version>
</dependency>
- 配置Redis连接
在Spring Boot项目中,可以在application.properties或application.yml文件中配置Redis连接信息。具体配置如下:
spring.redis.host=127.0.0.1
spring.redis.port=6379
spring.redis.password=
spring.redis.database=0
- 自定义序列化方式
Spring Session Redis提供了默认的序列化方式,但是如果要修改默认的序列化方式,就需要实现Serializer接口,并将自定义的序列化器配置到RedisConfigurer中。示例代码如下:
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;
import java.nio.charset.StandardCharsets;
public class CustomSerializer implements RedisSerializer<Object> {
private static final String PREFIX = "custom:";
private static final byte[] PREFIX_BYTES = PREFIX.getBytes(StandardCharsets.UTF_8);
@Override
public byte[] serialize(Object object) throws SerializationException {
if (object == null) {
return null;
}
String serializedValue = PREFIX + object.toString();
return serializedValue.getBytes(StandardCharsets.UTF_8);
}
@Override
public Object deserialize(byte[] bytes) throws SerializationException {
if (bytes == null || bytes.length == 0) {
return null;
}
String serializedValue = new String(bytes, StandardCharsets.UTF_8);
if (serializedValue.startsWith(PREFIX)) {
return serializedValue.substring(PREFIX.length());
}
throw new SerializationException("Cannot deserialize data with unknown prefix");
}
}
将自定义的序列化器配置到RedisConfigurer中,示例代码如下:
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.security.crypto.encrypt.BytesEncryptor;
import org.springframework.security.crypto.encrypt.Encryptors;
import org.springframework.session.config.annotation.web.http.EnableSpringHttpSession;
import org.springframework.session.data.redis.config.ConfigureRedisAction;
import org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfiguration;
import org.springframework.session.data.redis.config.annotation.web.http.RedisHttpSessionConfigurer;
import org.springframework.session.data.redis.serializer.RedisSerializationContext;
import org.springframework.session.data.redis.serializer.RedisSerializer;
import org.springframework.session.data.redis.serializer.SerializationException;
import java.nio.charset.StandardCharsets;
@Configuration
@EnableSpringHttpSession
public class RedisSessionConfig {
@Bean
public RedisHttpSessionConfigurer redisHttpSessionConfigurer() {
//自定义序列化器
RedisSerializer<Object> valueSerializer = new CustomSerializer();
RedisSerializationContext<Object, Object> serializationContext = RedisSerializationContext
.newSerializationContext()
.key(valueSerializer)
.value(valueSerializer)
.hashKey(valueSerializer)
.hashValue(valueSerializer)
.build();
//加密配置
BytesEncryptor encryptor = Encryptors.noOpText();
ConfigureRedisAction configureRedisAction = ConfigureRedisAction.NO_OP;
RedisHttpSessionConfiguration redisHttpSessionConfiguration = new RedisHttpSessionConfiguration();
return new RedisHttpSessionConfigurer() {
@Override
public void configureRedisAction(ConfigureRedisAction configureRedisAction) {
configureRedisAction.configure(null);
}
@Override
public void configure(RedisHttpSessionConfiguration redisHttpSessionConfiguration) {
redisHttpSessionConfiguration.setMaxInactiveIntervalInSeconds(3600);
redisHttpSessionConfiguration.setRedisNamespace("demo:session:");
redisHttpSessionConfiguration.setRedisFlushModeOnSave(RedisFlushMode.IMMEDIATE);
redisHttpSessionConfiguration.setSerializationContext(serializationContext);
redisHttpSessionConfiguration.setEncryptor(encryptor);
}
};
}
@Bean
public ConfigureRedisAction configureRedisAction() {
return ConfigureRedisAction.NO_OP;
}
@Bean
public RedisHttpSessionConfiguration redisHttpSessionConfiguration() {
RedisHttpSessionConfiguration redisHttpSessionConfiguration = new RedisHttpSessionConfiguration();
redisHttpSessionConfiguration.setMaxInactiveIntervalInSeconds(3600);
redisHttpSessionConfiguration.setRedisNamespace("demo:session:");
redisHttpSessionConfiguration.setRedisFlushModeOnSave(RedisFlushMode.IMMEDIATE);
return redisHttpSessionConfiguration;
}
}
- 示例说明
以下是示例1中自定义序列化器的具体说明:
示例1中实现的自定义序列化器类为CustomSerializer,实现了RedisSerializer接口。在CustomSerializer中,序列化方法将对象转换为字符串后添加了前缀"custom:",反序列化方法则截取了该前缀。这是为了防止误解析非自定义序列化器存储的数据。
以下是示例2中将自定义序列化器配置到RedisConfigurer中的具体说明:
在RedisSessionConfig中,定义了一个RedisHttpSessionConfigurer,在其中实现了configure方法。在configure方法中,通过RedisSerializationContext自定义了序列化器,并将其设置到RedisHttpSessionConfiguration中。最后通过setSerializationContext将RedisHttpSessionConfiguration设置到RedisHttpSessionConfigurer中。
经过以上配置,就可以使用自定义的序列化方式对Session数据进行存储和读取了。
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