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

    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-cache</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-data-redis</artifactId>    </dependency>

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;/** * <p>redis前缀配置，有时候多个工程共用一个db需要区分</p> * Created by [e-mail] 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 void update(User user) {        log.info("update db, user: {}", user.toString());        userMap.put(user.getId(), 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;/** * <p>redis缓存配置</p> * Created by [e-mail] on 2017/9/21. */@Configuration@EnableCachingpublic 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<String, Long> expiresMap = new HashMap<>();        expiresMap.put("user", 1000L);        manager.setExpires(expiresMap);        return manager;    }    @Bean    public RedisTemplate<String, String> 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: 8080spring:  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@EnableCachingpublic class SpringBootRedisCacheApplication {    public static void main(String[] args) {        SpringApplication.run(SpringBootRedisCacheApplication.class, args);    }}

示例

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