spring boot redis cache 缓存学习

spring boot redis cache 缓存学习

1. 自定义redis key前缀
2. 自定义redis key
3. 自定义全局key过期时间
4. 针对单个key自定义过期时间

引入依赖

    
        org.springframework.boot
        spring-boot-starter-cache
    
    
        org.springframework.boot
        spring-boot-starter-data-redis
    

自定义redis key前缀

package com.km.config;

import org.springframework.data.redis.cache.RedisCachePrefix;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * 
redis前缀配置，有时候多个工程共用一个db需要区分
 * Created by [email protected] on 2017/9/22.
 */
public class RedisPrefix implements RedisCachePrefix {
    private final RedisSerializer serializer;
    private final String delimiter;

    public RedisPrefix() {
        this(":");
    }

    public RedisPrefix(String delimiter) {
        this.serializer = new StringRedisSerializer();
        this.delimiter = delimiter;
    }

    @Override
    public byte[] prefix(String cacheName) {
        return this.serializer.serialize(this.delimiter != null ? this.delimiter.concat(":").concat(cacheName).concat(":") : cacheName.concat(":"));
    }
}

自定义redis key

    @Override
    @Cacheable(value = "user", key = "'user'.concat(#id.toString())")
    public User findUserById(Long id) {
        log.info("findUserById query from db, id: {}", id);
        return userMap.get(id);
    }
    @Override
    @CachePut(value = "user", key = "'user'.concat(#user.id.toString())")
    public User update(User user) {
        log.info("update db, user: {}", user.toString());
        userMap.put(user.getId(), user);
        return user;
    }
    @Override
    @CacheEvict(value = "user", key = "'user'.concat(#id.toString())")
    public void remove(Long id) {
        log.info("remove from db, id: {}", id);
        userMap.remove(id);
    }

自定义key过期时间

package com.km.config;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
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.RedisCacheManager;
import org.springframework.data.redis.cache.RedisCachePrefix;
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.Jackson2JsonRedisSerializer;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

/**
 * 
redis缓存配置
 * 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(RedisTemplate redisTemplate) {
        RedisCacheManager manager = new RedisCacheManager(redisTemplate);
        manager.setUsePrefix(true);
        RedisCachePrefix cachePrefix = new RedisPrefix("prefix");
        manager.setCachePrefix(cachePrefix);
        // 整体缓存过期时间
        manager.setDefaultExpiration(3600L);
        // 设置缓存过期时间。key和缓存过期时间，单位秒
        Map expiresMap = new HashMap<>();
        expiresMap.put("user", 1000L);
        manager.setExpires(expiresMap);
        return manager;
    }

    @Bean
    public RedisTemplate redisTemplate(RedisConnectionFactory factory) {
        StringRedisTemplate template = new StringRedisTemplate(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        template.setValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

配置yml

server:
  port: 8080
spring:
  cache:
    type: redis
  redis:
     host: 192.168.97.57 # server host
     port: 6379 # connection port
     pool.max-idle: 8 # pool settings ...
     pool.min-idle: 1
     pool.max-active: 8
     pool.max-wait: -1
     database: 0

配置启动

package com.km;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;

@SpringBootApplication
@EnableCaching
public class SpringBootRedisCacheApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringBootRedisCacheApplication.class, args);
	}
}

示例

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