【spring boot】2.0 整合spring-session,自定义序列化session存储到redis

一·引入jar包

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.0.0.RELEASE</version>
   <relativePath/> <!-- lookup parent from repository -->
</parent>

<dependency>
   <groupId>org.springframework.session</groupId>
   <artifactId>spring-session-data-redis</artifactId>
   <version>2.0.2.RELEASE</version>
</dependency>

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

二·编写代码

1·自定义序列化接口 ，实现RedisSerializer接口

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

/**
 * 说明:自定义redis序列化方式
 *
 * @author WangBin
 * @version V1.0
 * @since 2018.03.22
 */
public class FastJsonRedisSerializer<T> implements RedisSerializer<T> {
    
    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    public FastJsonRedisSerializer(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }
    
    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {
            return null;
        }
        String str = new String(bytes, DEFAULT_CHARSET);
        return JSON.parseObject(str, clazz);
    }
}

2·redis配置 

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.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.session.SessionRepository;
import org.springframework.session.data.redis.RedisOperationsSessionRepository;

import java.time.Duration;

/**
 *  redis 配置
 *
 * @author WangBin
 * @version V1.0
 * @date 2017.12.05
 */
@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();
        };
    }

    /**
     *  设置 redisTemplate 序列化方式
     * @param factory
     * @return
     */
    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(factory);
        // 设置值（value）的序列化采用FastJsonRedisSerializer。
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
        redisTemplate.setValueSerializer(fastJsonRedisSerializer);
        redisTemplate.setHashValueSerializer(fastJsonRedisSerializer);
        // 设置键（key）的序列化采用StringRedisSerializer。
        redisTemplate.setKeySerializer(new StringRedisSerializer());
        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
        redisTemplate.setDefaultSerializer(fastJsonRedisSerializer);
        redisTemplate.afterPropertiesSet();
        return redisTemplate;
    }


    /**
     * 设置spring session redis 序列化方式
     * @param factory
     * @return
     */
    @Bean
    public SessionRepository sessionRepository(RedisConnectionFactory factory){
        RedisOperationsSessionRepository sessionRepository =  new RedisOperationsSessionRepository(redisTemplate(factory));
        FastJsonRedisSerializer<Object> fastJsonRedisSerializer = new FastJsonRedisSerializer<>(Object.class);
        sessionRepository.setDefaultSerializer(fastJsonRedisSerializer);
        sessionRepository.setDefaultMaxInactiveInterval(36000);
        return sessionRepository;
    }
}

3·HttpSession配置

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisPassword;
import org.springframework.data.redis.connection.RedisStandaloneConfiguration;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.session.data.redis.config.annotation.web.http.EnableRedisHttpSession;
import org.springframework.session.web.http.HeaderHttpSessionIdResolver;
import org.springframework.session.web.http.HttpSessionIdResolver;

/**
 * 说明：自定义session
 *
 * @author WangBin
 * @version v1.0
 * @date 2018/1/27/027.
 */
@Configuration
@EnableRedisHttpSession(maxInactiveIntervalInSeconds = 36000)
public class HttpSessionConfig {

    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.password}")
    private String password;

    /**
     * RedisHttpSession 创建 连接工厂
     *
     * @return LettuceConnectionFactory
     */
    @Bean
    public LettuceConnectionFactory connectionFactory() {
        RedisStandaloneConfiguration config = new RedisStandaloneConfiguration();
        config.setHostName(host);
        config.setPort(port);
        config.setPassword(RedisPassword.of(password));
        return new LettuceConnectionFactory(config);
    }

三·遗留问题

devtools热加载后 从 redis 读取 session 里的 属性的时候 转换为对象 会报 java.lang.ClassCastException

debug发现 热加载后 序列化方式一致，但会报该异常。

正常运行 或 重启项目 无该问题