springboot项目 mybaitisplus集成redis，快速_mybatis-plu整合redis

在config中添加bean

   /**
     * 重写Redis序列化方式，使用Json方式:
     * 当我们的数据存储到Redis的时候，我们的键（key）和值（value）都是通过Spring提供的Serializer序列化到数据库的。RedisTemplate默认使用的是JdkSerializationRedisSerializer，StringRedisTemplate默认使用的是StringRedisSerializer。
     * Spring Data JPA为我们提供了下面的Serializer：
     * GenericToStringSerializer、Jackson2JsonRedisSerializer、JacksonJsonRedisSerializer、JdkSerializationRedisSerializer、OxmSerializer、StringRedisSerializer。
     * 在此我们将自己配置RedisTemplate并定义Serializer。
     *
     * @param redisConnectionFactory
     * @return
     */
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) {
        RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(redisConnectionFactory);

        Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<Object>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);

        // 设置值（value）的序列化采用Jackson2JsonRedisSerializer。
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
        // 设置键（key）的序列化采用StringRedisSerializer。
        redisTemplate.setKeySerializer(new StringRedisSerializer());

        redisTemplate.afterPropertiesSet();
        return redisTemplate;
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添加一个SpringContextHolder.class
`

import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候中取出ApplicaitonContext.
 */
@Component
public class SpringContextHolder implements ApplicationContextAware {
    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.
     */
    public void setApplicationContext(ApplicationContext applicationContext) {
        SpringContextHolder.applicationContext = applicationContext; // NOSONAR
    }

    /**
     * 取得存储在静态变量中的ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        checkApplicationContext();
        return applicationContext;
    }

    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        checkApplicationContext();
        return (T) applicationContext.getBean(name);
    }

    /**
     * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(Class<T> clazz) {
        checkApplicationContext();
        return (T) applicationContext.getBeansOfType(clazz);
    }

    /**
     * 清除applicationContext静态变量.
     */
    public static void cleanApplicationContext() {
        applicationContext = null;
    }

    private static void checkApplicationContext() {
        if (applicationContext == null) {
            throw new IllegalStateException("applicaitonContext未注入,请在applicationContext.xml中定义SpringContextHolder");
        }
    }
}
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添加一个MybatisRedisCache.class

> `
import com.api.zhehaotob.SpringContextHolder;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.cache.Cache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.RedisServerCommands;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Set;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

@Slf4j

public class MybatisRedisCache implements Cache {
    // 读写锁
    private final ReadWriteLock readWriteLock = new ReentrantReadWriteLock(true);

    //这里使用了redis缓存，使用springboot自动注入
//    @Autowired
//    private RedisTemplate<String, Object> redisTemplate;
    private RedisTemplate<String, Object> redisTemplate = SpringContextHolder.getBean("redisTemplate");

    private String id;

    public MybatisRedisCache(final String id) {
        if (id == null) {
            throw new IllegalArgumentException("Cache instances require an ID");
        }
        this.id = id;
    }

    @Override
    public String getId() {
        return this.id;
    }

    @Override
    public void putObject(Object key, Object value) {
        if (redisTemplate == null) {

            //由于启动期间注入失败，只能运行期间注入，这段代码可以删除
            redisTemplate =  SpringContextHolder.getBean("redisTemplate");
        }
        if (value != null) {
            redisTemplate.opsForValue().set(key.toString(), value);
        }
    }

    @Override
    public Object getObject(Object key) {
        try {
            if (key != null) {
                return redisTemplate.opsForValue().get(key.toString());
            }
        } catch (Exception e) {
            log.error("缓存出错 ");
        }
        return null;
    }

    @Override
    public Object removeObject(Object key) {
        if (key != null) {
            redisTemplate.delete(key.toString());
        }
        return null;
    }

    @Override
    public void clear() {
        log.debug("清空缓存");
//        if (redisTemplate == null) {
//            redisTemplate = (RedisTemplate<String, Object>) ApplicationContextRegister.getApplicationContext().getBean("functionDomainRedisTemplate");
//        }
        Set<String> keys = redisTemplate.keys("*:" + this.id + "*");
        if (!CollectionUtils.isEmpty(keys)) {
            redisTemplate.delete(keys);
        }
    }

    @Override
    public int getSize() {
        Long size = redisTemplate.execute((RedisCallback<Long>) RedisServerCommands::dbSize);
        return size.intValue();
    }

    @Override
    public ReadWriteLock getReadWriteLock() {
        return this.readWriteLock;
    }

}
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`

`

pom.xml里添加redis

     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
     </dependency>
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在需要redis的mapper文件里添加

@Repository
@CacheNamespace(implementation= MybatisRedisCache.class,eviction=MybatisRedisCache.class)
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在项目配置文件里添加或者修改

#二级缓存
mybatis-plus.configuration.cache-enabled=true
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