Springboot 2.0.1 整合redis 做缓存

1.在Maven添加依赖

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-redis</artifactId>
        <exclusions>
            <exclusion>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
            </exclusion>
            <exclusion>
                <groupId>io.lettuce</groupId>
                <artifactId>lettuce-core</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-pool2</artifactId>
        <version>2.4.2</version>
    </dependency>

2.配置文件中添加##

spring.cache.type=redis
spring.redis.host=127.0.0.1

/#没有密码为空
spring.redis.password= 
spring.redis.port= 6379
spring.redis.jedis.pool.max-active=8
spring.redis.jedis.pool.max-wait=-1ms
spring.redis.jedis.pool.min-idle=0

3.创建配置类##

package com.gwd.config;

import java.lang.reflect.Method;
import java.time.Duration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.springframework.cache.CacheManager;
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.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;



/**
 * <p>redis缓存配置</p>
 * Created by [email protected] on 2017/9/21.
 */
@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport {

    @Bean
    public KeyGenerator KeyGenerator() {
        return new KeyGenerator() {
            @Override
            public Object generate(Object target, Method method, Object... 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();
            }
        };
    }
    @Bean
    public CacheManager cacheManager(RedisConnectionFactory factory) {
        RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig();  // 生成一个默认配置，通过config对象即可对缓存进行自定义配置
        config = config.entryTtl(Duration.ofMinutes(1))     // 设置缓存的默认过期时间，也是使用Duration设置
                .disableCachingNullValues();     // 不缓存空值

        // 设置一个初始化的缓存空间set集合
        Set<String> cacheNames =  new HashSet<>();
        cacheNames.add("my-redis-cache1");
        cacheNames.add("my-redis-cache2");

        // 对每个缓存空间应用不同的配置
        Map<String, RedisCacheConfiguration> configMap = new HashMap<>();
        configMap.put("my-redis-cache1", config);
        configMap.put("my-redis-cache2", config.entryTtl(Duration.ofSeconds(120)));

        RedisCacheManager cacheManager = RedisCacheManager.builder(factory)     // 使用自定义的缓存配置初始化一个cacheManager
                .initialCacheNames(cacheNames)  // 注意这两句的调用顺序，一定要先调用该方法设置初始化的缓存名，再初始化相关的配置
                .withInitialCacheConfigurations(configMap)
                .build();
        return cacheManager;
    }

}

4.springboot在2.0.x##

引入了lettuce，和jedis 客户端。且对CacheManager初始化做了修改。
最后实体类要实现 Serializable 接口

5#

如果从redis取数据的时候抛出com.bootdo.system.domain.UserDO cannot be cast to com.bootdo.system.domain.UserDO 之类的异常，根据网上给出的答案是和类加载器有关，很多做法都是注释掉

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>

其实还有另一种方法在启动类中加上
System.setProperty(“spring.devtools.restart.enabled”,“false”);

public static void main(String[] args) {
    System.setProperty("spring.devtools.restart.enabled","false");
    SpringApplication.run(QmklApplication.class, args);
}

然后重新启动就行了。