Springboot2.1.4集成redis注解版

Springboot2.1.4集成redis注解版

1. 创建springboot项目
2. 导入依赖
3. 配置redis连接信息
4. 创建序列化器
5. 配置缓存管理器
6. 测试

1创建springboot项目

选中这几个模块，后面不够再加

2，导入依赖

在pom文件加入

 
        
            org.apache.commons
            commons-pool2
            2.4.2
        
       
        
            com.alibaba
            fastjson
            1.2.47
        
           
        
            io.netty
            netty-all
            4.1.34.Final
        

注意一定要导入netty,不如就会报这个错,具体原因可能是springboot2.x

2019-05-10 22:08:22.852  INFO 212 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration' of type [org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$604e18d] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-05-10 22:08:22.951  INFO 212 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'lettuceClientResources' of type [io.lettuce.core.resource.DefaultClientResources] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2019-05-10 22:08:22.962  WARN 212 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectingArgumentResolverBeanPostProcessor' defined in class path resource [org/springframework/data/web/config/ProjectingArgumentResolverRegistrar.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cache.annotation.ProxyCachingConfiguration': Unsatisfied dependency expressed through method 'setConfigurers' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisConfig': Unsatisfied dependency expressed through field 'redisTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisTemplate' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'redisTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisConnectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
2019-05-10 22:08:22.978  INFO 212 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-05-10 22:08:22.994 ERROR 212 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectingArgumentResolverBeanPostProcessor' defined in class path resource [org/springframework/data/web/config/ProjectingArgumentResolverRegistrar.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.cache.annotation.ProxyCachingConfiguration': Unsatisfied dependency expressed through method 'setConfigurers' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisConfig': Unsatisfied dependency expressed through field 'redisTemplate'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'redisTemplate' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/RedisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'redisTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisConnectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]

3，配置redis连接信息

在application.properties添加如下信息

#Redis
# 缓存时长，单位秒
cache.default-exp=72
spring.redis.database=0
spring.redis.host=127.0.0.1
spring.redis.port=6379
# 密码
spring.redis.password=
# 连接超时时间 单位 ms（毫秒）
spring.redis.timeout=3000
# 连接池中的最大空闲连接，默认值也是8
spring.redis.lettuce.pool.max-idle=100
# 连接池中的最小空闲连接，默认值也是0
spring.redis.lettuce.pool.min-idle=50
# 如果赋值为-1，则表示不限制
spring.redis.lettuce.pool.max-wait=2000

4，创建fastjson通用序列化器

建一个FastJsonRedisSerializer类，如下图

添加如下代码

package com.demo.redis.config;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
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;

public class FastJsonRedisSerializer implements RedisSerializer {

    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class clazz;
    static {
        ParserConfig.getGlobalInstance().addAccept("com.demo.redis.entity.Classes");
        ParserConfig.getGlobalInstance().addAccept("com.demo.redis.entity.Grade");
    }
    public FastJsonRedisSerializer(Class clazz) {
        super();
        this.clazz = clazz;
    }

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

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

}

5，配置缓存管理器

建一个RedisConfig类来配置redis,如下图

添加如下代码

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheConfiguration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.RedisSerializationContext;
import org.springframework.data.redis.serializer.StringRedisSerializer;

import java.time.Duration;

@Configuration
@ConditionalOnClass(RedisOperations.class)      //系统中有RedisOperations类时
@EnableConfigurationProperties(RedisProperties.class)  //启动RedisProperties这个类
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {
    @Autowired
    RedisTemplate redisTemplate;
    // 配置缓存管理器
    @Bean
    public RedisCacheManager cacheManager(RedisConnectionFactory connectionFactory) {
        LettuceConnectionFactory jedisConnectionFactory = (LettuceConnectionFactory) redisTemplate.getConnectionFactory();
        jedisConnectionFactory.setDatabase(2);      //指定dbindex
        redisTemplate.setConnectionFactory(jedisConnectionFactory);
        jedisConnectionFactory.resetConnection();

        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                .entryTtl(Duration.ofSeconds(60*20)) // 20分钟缓存失效
                // 设置key的序列化方式
                .serializeKeysWith(RedisSerializationContext.SerializationPair.fromSerializer(new StringRedisSerializer()))
                // 设置value的序列化方式
                .serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new FastJsonRedisSerializer(Object.class)))
                // 不缓存null值
                .disableCachingNullValues();
        RedisCacheManager redisCacheManager = RedisCacheManager.builder(connectionFactory)
                .cacheDefaults(config)
                .transactionAware()
                .build();
        return redisCacheManager;
    }
    }

注意一定不能导入import com.alibaba.fastjson.support.spring.FastJsonRedisSerializer;否者就会出现如下错误

java.lang.ClassCastException: com.alibaba.fastjson.JSONObject cannot be cast to com.demo.redis.entity.Classes

6测试

先用Easycode,生成基本的controller,service,model,dao,mapper,具体步骤可参见我上上篇文章，这里不做演示
生成后的项目结构如下

然后添加这两个注解即可
@CacheConfig()：配置这个类的redis属性
cacheNames = “classes”：存储的数据库名字
cacheManager = “cacheManager”：使用我们的cacheManager
@Cacheable(key="#classesid")：主键生成策略

访问我们的controller

然后查看redis数据库

可以看到数据已经存进去了
最后再查看一遍控制台

不管请求几次，只要是查询1这个id,控制台就一直只有一遍查询数据库，说明第一次过后的数据都是从redis中取出来的

到此redis就已经全部整合完毕了，欢迎大家评论