spring boot2.x cache —— redis

绝地灬酷狼 2023-05-31 07:20 16阅读 0赞

## **引入pom文件** ##

```java
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cache</artifactId>
    </dependency>

## **yml配置**
    
    ```java
    spring:
      redis:
        host: 0.0.0.1
        password:123
        port: 4379
        timeout: 10000ms
        jedis:
          pool:
            max-active: 1024
            max-idle: 200
            max-wait: 10000ms
        database: 1

## **实现 CacheConfig类** ##

/**
     * @Author KeXin
     * @Date 2019/6/19 下午6:32
     **/
    @EnableCaching
    @Configuration
    public class CacheConfig extends CachingConfigurerSupport {
        
        @Bean
        public CacheManager cacheManager(RedisConnectionFactory factory) {
        
            Map<String, RedisCacheConfiguration> initialCacheConfiguration = new LinkedHashMap<>();
            // spring boot2.0之后不支持直接setExpire
            addCache(initialCacheConfiguration, "offLineCache", 2);
        
            return RedisCacheManager.builder(factory)
                    .withInitialCacheConfigurations(initialCacheConfiguration)
                    .transactionAware()
                    .build();
        
        }
    
        private void addCache(Map<String, RedisCacheConfiguration> initialCacheConfiguration, String cacheName, long ttl){
        
            RedisCacheConfiguration config = RedisCacheConfiguration.defaultCacheConfig()
                    .entryTtl(Duration.ofSeconds(ttl))
                    .disableCachingNullValues()
                    .prefixKeysWith(cacheName);
            initialCacheConfiguration.put(cacheName,config);
        }
    
        @Override
        @Bean
        public KeyGenerator keyGenerator() {
        
            return (o, method, params) -> {
        
                //本类名+方法名+参数名 为key
                StringBuilder sb = new StringBuilder();
                sb.append(o.getClass().getName());
                sb.append("-");
                sb.append(method.getName());
                sb.append("-");
                for (Object param : params) {
        
                    sb.append(param.toString());
                }
                return sb.toString();
            };
        }
    }

## **测试controller实现** ##

package com.kexin.ehcache.controller;
    
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    /**
     * @Author KeXin
     * @Date 2019/06/20 下午6:17
     **/
    @RestController
    @RequestMapping("test")
    public class TestController {
        
        @RequestMapping("/e-get")
        @Cacheable(value = "offLineCache", key = "#key")
        public String get(String key){
        
            System.out.println("未走echache");
            return key.hashCode()+"";
        }
    }

## **常用注解** ##

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