第一次接触redis，自己碰了好多回壁。下面是乱码图

下面是配置成功了的redis缓存图

一、重要的redis配置类

package com.tt.springboot.config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.cache.CacheProperties;
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.core.StringRedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;


/**
 * Redis缓存配置类
 *
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport{

    @Value("${spring.redis.host}")
    private String host;
    @Value("${spring.redis.port}")
    private int port;
    @Value("${spring.redis.password}")
    private String password;
    
    @Bean
    public RedisCacheConfiguration redisCacheConfiguration(CacheProperties cacheProperties) {
        CacheProperties.Redis redisProperties = cacheProperties.getRedis();
        RedisCacheConfiguration config = RedisCacheConfiguration
                .defaultCacheConfig();

        config = config.serializeValuesWith(RedisSerializationContext.SerializationPair
                .fromSerializer(new GenericJackson2JsonRedisSerializer()));

        if (redisProperties.getTimeToLive() != null) {
            config = config.entryTtl(redisProperties.getTimeToLive());
        }
        if (redisProperties.getKeyPrefix() != null) {
            config = config.prefixKeysWith(redisProperties.getKeyPrefix());
        }
        if (!redisProperties.isCacheNullValues()) {
            config = config.disableCachingNullValues();
        }
        if (!redisProperties.isUseKeyPrefix()) {
            config = config.disableKeyPrefix();
        }
        return config;
    }
}

网上又很多这个的配置类，但是我试了很多都依旧是乱码，只有这个好用。虽然我也看不懂！

二、serviceimpl类的注解使用。

package com.tt.service;



import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

import com.tt.mapper.UserMapper;
import com.tt.model.User;

@Service
public class UserserviceImpl implements UserService{
    
    @Autowired
    private UserMapper userMapper;

    @Cacheable(cacheNames="test",key="#user.id")
    public User selectByUsername(String username) {
        User user = userMapper.selectByUsername(username);
        System.out.println("select");
        return user;
    }

    @CachePut(cacheNames="test",key="#user.username")
    public User insertSelective(User user) {
        userMapper.insertSelective(user);
        return user;
    }
    
}

需要注意的是：

Cacheable注解方法的返回值需要与CachePut注解方法的返回值一致。否则即使Cacheable存入不乱码，但CachePut依旧乱码，而且还不会更新数据。