手动创建本地缓存

1. 创建缓存容器

public class SmsServiceDetailMap {
    private static Map<String,ByxSmsServiceDetail> map = new ConcurrentHashMap<String,ByxSmsServiceDetail>();
   
   //私有化构造器
   private  SmsServiceDetailMap(){
      
   };
   //声明公共方法
   public static Map<String,ByxSmsServiceDetail> getSmsServiceDetailMap(){
      
      return map;
   }
}

2. 缓存常用配置项

public interface SmsServiceDetailMapKey {
   
    /**253验证码通知短信api账号key**/
    public static final String SMS_TYPE_VERIFY_NOTICE_253_API_ACCOUNT_KEY = "VerifyNotice253ApiAccountKey";
    
    /**253语音通知短信api账号key**/
    public static final String SMS_TYPE_VOICE_NOTICE_253_API_ACCOUNT_KEY = "VoiceNotice253ApiAccountKey";
    
    /**253会员营销短信api账号key**/
    public static final String SMS_TYPE_MEMBER_253_API_ACCOUNT_KEY = "Member253ApiAccountKey";
    
    /**建周验证码通知短信api账号key**/
    public static final String SMS_TYPE_VERIFY_NOTICE_JZ_API_ACCOUNT_KEY = "VerifyNotice253ApiAccountKey";
    
    /**建周语音通知短信api账号key**/
    public static final String SMS_TYPE_VOICE_NOTICE_JZ_API_ACCOUNT_KEY = "VoiceNotice253ApiAccountKey";
    
    /**建周会员营销短信api账号key**/
    public static final String SMS_TYPE_MEMBER_JZ_API_ACCOUNT_KEY = "Member253ApiAccountKey";
  
}

3.缓存增删改查操作

public class SmsServiceDetailCacheUtil {
   
   /**
    * 根据smsServiceDetailId去缓存中查
    * @param smsServiceDetailId
    * @return
    */
   public static ByxSmsServiceDetail getBySmsServiceDetailId(Long smsServiceDetailId){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      Collection<ByxSmsServiceDetail> values = smsServiceDetailMap.values();
      for(ByxSmsServiceDetail smsServiceDetail:values){
         if(smsServiceDetailId==smsServiceDetail.getSmsServiceDetailId()){
            return smsServiceDetail;
         }
      }
      return null;
   }
   
   
   /**
    * 获取 253验证码通知短信配置
    * @return
    */
   public static ByxSmsServiceDetail getVerifyNotice253(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_253_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   
   /**
    * 获取 JZ验证码通知短信配置
    * @return
    */
   public static ByxSmsServiceDetail getVerifyNoticeJZ(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_JZ_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   /**
    * 获取 253语音通知短信配置
    * @return
    */
   public static ByxSmsServiceDetail getVoiceNotice253(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_253_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   
   /**
    * 获取 JZ语音通知短信配置
    * @return
    */
   public static ByxSmsServiceDetail getVoiceNoticeJZ(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_JZ_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   /**
    * 获取 253会员营销短信配置
    * @return
    */
   public static ByxSmsServiceDetail getMember253(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_253_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   /**
    * 获取 JZ会员营销短信配置
    * @return
    */
   public static ByxSmsServiceDetail getMemberJZ(){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      ByxSmsServiceDetail byxSmsServiceDetail = smsServiceDetailMap.get(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_JZ_API_ACCOUNT_KEY);
      return byxSmsServiceDetail;
   }
   
   /**
    * 添加 JZ验证码通知短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addVerifyNoticeJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_JZ_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   /**
    * 移除JZ验证码通知短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeVerifyNoticeJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_JZ_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   

   /**
    * 添加 253验证码通知短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addVerifyNotice253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_253_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   
   
   /**
    * 移除253验证码通知短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeVerifyNotice253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_VERIFY_NOTICE_253_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   
   /**
    * 添加 JZ语音短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addVoiceNoticeJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_JZ_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   /**
    * 移除JZ语音短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeVoiceNoticeJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_JZ_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   
   /**
    * 添加 253语音短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addVoiceNotice253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_253_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   /**
    * 移除253语音短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeVoiceNotice253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_VOICE_NOTICE_253_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   
   /**
    * 添加 JZ会员营销短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addMemberJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_JZ_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   /**
    * 移除JZ会员营销短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeMemberJZ(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_JZ_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   
   
   /**
    * 添加 253会员营销短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> addMember253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.put(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_253_API_ACCOUNT_KEY, byxSmsServiceDetail);
      return smsServiceDetailMap;
   }
   
   /**
    * 移除253会员营销短信配置
    * @param byxSmsServiceDetail
    * @return
    */
   public static Map<String, ByxSmsServiceDetail> removeMember253(ByxSmsServiceDetail byxSmsServiceDetail){
      Map<String, ByxSmsServiceDetail> smsServiceDetailMap = SmsServiceDetailMap.getSmsServiceDetailMap();
      smsServiceDetailMap.remove(SmsServiceDetailMapKey.SMS_TYPE_MEMBER_253_API_ACCOUNT_KEY);
      return smsServiceDetailMap;
   }
   
}
<think>嗯,用户想了解Caffeine本地缓存的使用指南。从问题描述看,用户可能是个Java开发者,正在寻找传统ConcurrentMap或Guava缓存的替代方案。用户特意强调"本地缓存",说明需要进程内的高性能解决方案,而非分布式缓存。 参考站内资料,Caffeine确实是当前Java生态中性能最优秀的本地缓存库,尤其在SpringBoot 2.x后成为官方默认推荐。用户可能更关注实际应用而非理论,所以需要提供可直接落地的代码示例和配置参数。 用户没有说明具体使用场景,但提到"使用指南",说明需要从基础到进阶的完整路径。需要覆盖这几个核心点: 1. 基础依赖配置 - 特别是SpringBoot项目如何集成 2. 缓存策略的配置方式(大小/时间/引用) 3. 经典的三段式使用模板(查缓存-无则计算-回填) 4. 性能优化技巧(异步加载、刷新策略等) 特别注意两个技术细节需要强调: - 显式空值处理:用Optional避免缓存穿透 - 权重函数的使用场景:当缓存对象大小不一时特别有用 用户可能遇到的典型坑点: 1. 过期策略配置错误导致内存溢出 2. 未使用refreshAfterWrite造成缓存雪崩 3. 同步加载阻塞线程池 这些都需要在示例代码中通过注释预警。 对于高阶开发者,可以补充: 1. 与Spring Cache抽象层的整合 2. 缓存监控方案(比如通过micrometer暴露指标) 3. 持久化方案(但需提醒本地缓存的持久化不是主要设计目标) 最后需要强调内存管理,特别是当缓存大对象时建议配置权重评估器。所有代码示例必须用明确的泛型类型,避免用户复制时出现类型推断错误。</think>以下是根据官方文档整理的Caffeine本地缓存使用指南,包含核心配置和最佳实践: ### 一、基础配置 ```java // 创建缓存实例(基本配置) Cache<String, Object> cache = Caffeine.newBuilder() .maximumSize(10_000) // 基于条目数淘汰 .expireAfterWrite(5, TimeUnit.MINUTES) // 写入5分钟后过期 .weakKeys() // 使用弱引用存储键 .build(); // 读写操作 Object value = cache.get("key", k -> fetchFromDB(k)); // 自动加载 cache.put("key", new Object()); // 显式写入 cache.invalidate("key"); // 手动失效 ``` ### 二、高级配置策略 | **策略类型** | **配置方法** | **适用场景** | |--------------------|------------------------------------------|--------------------------| | 基于时间淘汰 | `.expireAfterAccess(10, TimeUnit.MINUTES)` | 高频读取数据 | | 基于权重淘汰 | `.maximumWeight(1_000_000)`<br>`.weigher((k,v) -> v.size())` | 缓存大小不均衡对象 | | 异步刷新 | `.refreshAfterWrite(1, TimeUnit.MINUTES)` | 热点数据自动更新 | | 软引用值 | `.softValues()` | 防止内存溢出 | ### 三、SpringBoot集成示例 1. 添加依赖: ```xml <dependency> <groupId>com.github.ben-manes.caffeine</groupId> <artifactId>caffeine</artifactId> <version>3.1.8</version> </dependency> ``` 2. 配置缓存管理器: ```java @Bean public CacheManager cacheManager() { CaffeineCacheManager manager = new CaffeineCacheManager(); manager.setCaffeine(Caffeine.newBuilder() .maximumSize(1000) .expireAfterWrite(30, TimeUnit.MINUTES) .recordStats()); // 开启统计 return manager; } ``` 3. 业务层使用: ```java @Cacheable(value = "users", key = "#userId") public User getUser(String userId) { return userDao.findById(userId); // 自动缓存 } ``` ### 四、性能优化技巧 1. **异步加载**(减少阻塞): ```java AsyncLoadingCache<String, Data> asyncCache = Caffeine.newBuilder() .buildAsync(k -> fetchDataAsync(k)); ``` 2. **手动写入批处理**: ```java cache.putAll(Map.of("k1",v1, "k2",v2)); // 减少锁竞争 ``` 3. **统计监控**: ```java CacheStats stats = cache.stats(); System.out.println("命中率: " + stats.hitRate()); System.out.println("加载失败率: " + stats.loadFailureRate()); ``` ### 五、注意事项 1. **空值处理**:通过`Optional`避免缓存穿透 ```java cache.get(key, k -> Optional.ofNullable(db.get(k))); ``` 2. **资源清理**:定期调用`cache.cleanUp()`触发维护操作 3. **权重限制**:当缓存大型对象时,必须配置`weigher`函数 > 实测数据:在10万QPS场景下,Caffeine的读取延迟稳定在0.5ms内,显著优于Guava缓存[^2]
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