{"id":290,"date":"2026-10-20T10:35:56","date_gmt":"2026-10-20T02:35:56","guid":{"rendered":"https:\/\/yykcj.com\/?p=290"},"modified":"2026-10-20T10:35:56","modified_gmt":"2026-10-20T02:35:56","slug":"redis-%e7%bc%93%e5%ad%98%e7%ad%96%e7%95%a5%e5%ae%9e%e6%88%98%ef%bc%9a%e5%bd%bb%e5%ba%95%e8%a7%a3%e5%86%b3%e7%a9%bf%e9%80%8f%e3%80%81%e5%87%bb%e7%a9%bf%e4%b8%8e%e9%9b%aa%e5%b4%a9%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/yykcj.com\/?p=290","title":{"rendered":"Redis \u7f13\u5b58\u7b56\u7565\u5b9e\u6218\uff1a\u5f7b\u5e95\u89e3\u51b3\u7a7f\u900f\u3001\u51fb\u7a7f\u4e0e\u96ea\u5d29\u95ee\u9898"},"content":{"rendered":"<h2>\u5f15\u8a00<\/h2>\n<p>\u5728\u9ad8\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0cRedis \u4f5c\u4e3a\u7f13\u5b58\u5c42\u5df2\u7ecf\u4e0d\u53ef\u6216\u7f3a\u3002\u4f46\u4f60\u662f\u5426\u9047\u5230\u8fc7\uff1a\u67d0\u4e2a\u4e0d\u5b58\u5728\u7684 ID \u75af\u72c2\u8bf7\u6c42\u5bfc\u81f4\u6570\u636e\u5e93\u538b\u529b\u98d9\u5347\uff1f\u70ed\u70b9 Key \u8fc7\u671f\u77ac\u95f4\u5927\u91cf\u8bf7\u6c42\u76f4\u63a5\u6253\u5230\u6570\u636e\u5e93\uff1f\u5927\u91cf Key \u540c\u65f6\u5931\u6548\u5f15\u53d1\u8fde\u9501\u53cd\u5e94\uff1f\u8fd9\u4e9b\u6b63\u662f\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u548c\u96ea\u5d29\u7684\u5178\u578b\u75c7\u72b6\u3002<\/p>\n<p>\u672c\u6587\u5c06\u4ece\u5b9e\u9645\u573a\u666f\u51fa\u53d1\uff0c\u5148\u8bb2\u6e05\u4e09\u8005\u7684\u672c\u8d28\u533a\u522b\uff0c\u518d\u7ed9\u51fa\u53ef\u843d\u5730\u7684\u4ee3\u7801\u65b9\u6848\uff0c\u6700\u540e\u5206\u4eab\u4e00\u4e9b\u5bb9\u6613\u5ffd\u7565\u7684\u7ec6\u8282\u4e0e\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<h2>1. \u6982\u5ff5\u8fa8\u6790\uff1a\u7a7f\u900f vs \u51fb\u7a7f vs \u96ea\u5d29<\/h2>\n<p>| \u95ee\u9898 | \u89e6\u53d1\u6761\u4ef6 | \u73b0\u8c61 | \u6838\u5fc3\u89e3\u51b3\u601d\u8def | |&#8212;&#8212;|&#8212;&#8212;&#8212;-|&#8212;&#8212;|&#8212;&#8212;&#8212;&#8212;&#8211;| | \u7f13\u5b58\u7a7f\u900f | \u67e5\u8be2\u4e0d\u5b58\u5728\u7684\u6570\u636e | \u7f13\u5b58\u548c\u6570\u636e\u5e93\u90fd\u65e0\u6570\u636e\uff0c\u6bcf\u6b21\u8bf7\u6c42\u90fd\u7a7f\u900f\u5230 DB | \u7f13\u5b58\u7a7a\u503c\u3001\u5e03\u9686\u8fc7\u6ee4\u5668 | | \u7f13\u5b58\u51fb\u7a7f | \u70ed\u70b9 Key \u8fc7\u671f | \u5927\u91cf\u8bf7\u6c42\u540c\u65f6\u8bbf\u95ee\u5df2\u8fc7\u671f\u7684\u70ed\u70b9 Key | \u4e92\u65a5\u9501\u3001\u903b\u8f91\u8fc7\u671f | | \u7f13\u5b58\u96ea\u5d29 | \u5927\u91cf Key \u540c\u65f6\u8fc7\u671f\u6216 Redis \u5b95\u673a | \u6570\u636e\u5e93\u77ac\u95f4\u627f\u53d7\u5168\u91cf\u8bf7\u6c42 | \u968f\u673a\u8fc7\u671f\u65f6\u95f4\u3001\u9ad8\u53ef\u7528\u96c6\u7fa4\u3001\u7194\u65ad\u964d\u7ea7 |<\/p>\n<p>\u4e0b\u9762\u6211\u4eec\u9010\u4e00\u62c6\u89e3\uff0c\u5e76\u7ed9\u51fa Spring Boot + Redis \u7684\u5b9e\u6218\u4ee3\u7801\u3002<\/p>\n<h2>2. \u7f13\u5b58\u7a7f\u900f\uff1a\u5e03\u9686\u8fc7\u6ee4\u5668 + \u7a7a\u503c\u7f13\u5b58<\/h2>\n<h3>\u573a\u666f\u590d\u73b0<\/h3>\n<p>\u5047\u8bbe\u6709\u4e00\u4e2a\u7528\u6237\u67e5\u8be2\u63a5\u53e3 <code>GET \/user\/{id}<\/code>\uff0c\u653b\u51fb\u8005\u7528\u4e0d\u5b58\u5728\u7684 ID\uff08\u5982\u8d1f\u6570\u548c\u8d85\u5927\u6570\uff09\u9891\u7e41\u8bf7\u6c42\u3002\u7531\u4e8e\u7f13\u5b58\u4e0d\u547d\u4e2d\uff0c\u6bcf\u6b21\u90fd\u4f1a\u67e5\u6570\u636e\u5e93\uff0c\u5bfc\u81f4 DB \u538b\u529b\u8fc7\u5927\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e00\uff1a\u7f13\u5b58\u7a7a\u503c<\/h3>\n<p>\u5bf9\u4e8e\u67e5\u8be2\u7ed3\u679c\u4e3a\u7a7a\u7684\u6570\u636e\uff0c\u4ecd\u7136\u5199\u5165\u7f13\u5b58\uff0c\u4f46\u8bbe\u7f6e\u8f83\u77ed\u7684\u8fc7\u671f\u65f6\u95f4\uff08\u5982 60 \u79d2\uff09\u3002<\/p>\n<pre><code class=\"language-java\">\npublic User getUserById(Long id) {\n    String cacheKey = &quot;user:&quot; + id;\n    String cached = redisTemplate.opsForValue().get(cacheKey);\n    if (cached != null) {\n        \/\/ \u5982\u679c\u7f13\u5b58\u7684\u662f\u7a7a\u503c\u6807\u8bb0\uff0c\u76f4\u63a5\u8fd4\u56de null\n        if (&quot;NULL&quot;.equals(cached)) {\n            return null;\n        }\n        return JSON.parseObject(cached, User.class);\n    }\n    User user = userMapper.selectById(id);\n    if (user == null) {\n        \/\/ \u7f13\u5b58\u7a7a\u503c\uff0c\u8fc7\u671f\u65f6\u95f4\u77ed\u4e00\u4e9b\n        redisTemplate.opsForValue().set(cacheKey, &quot;NULL&quot;, 60, TimeUnit.SECONDS);\n        return null;\n    }\n    redisTemplate.opsForValue().set(cacheKey, JSON.toJSONString(user), 30, TimeUnit.MINUTES);\n    return user;\n}\n<\/code><\/pre>\n<p>> <strong>\u6ce8\u610f<\/strong>\uff1a\u7a7a\u503c\u7f13\u5b58\u53ea\u80fd\u5e94\u5bf9\u968f\u673a\u7684\u4e0d\u5b58\u5728 ID\uff0c\u5982\u679c\u653b\u51fb\u8005\u6bcf\u6b21\u4f7f\u7528\u4e0d\u540c\u7684\u968f\u673a ID\uff0c\u4f9d\u7136\u4f1a\u4ea7\u751f\u5927\u91cf\u7a7a\u503c\u7f13\u5b58\uff0c\u5360\u7528\u5185\u5b58\u3002\u6b64\u65f6\u9700\u8981\u5e03\u9686\u8fc7\u6ee4\u5668\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e8c\uff1a\u5e03\u9686\u8fc7\u6ee4\u5668<\/h3>\n<p>\u5e03\u9686\u8fc7\u6ee4\u5668\u53ef\u4ee5\u5feb\u901f\u5224\u65ad\u4e00\u4e2a\u5143\u7d20\u662f\u5426<strong>\u53ef\u80fd\u5b58\u5728<\/strong>\u3002\u6211\u4eec\u5c06\u6240\u6709\u5408\u6cd5 ID \u9884\u5148\u52a0\u8f7d\u5230\u5e03\u9686\u8fc7\u6ee4\u5668\u4e2d\uff0c\u67e5\u8be2\u524d\u5148\u8fc7\u6ee4\u3002<\/p>\n<p>\u4f7f\u7528 Redisson \u7684\u5e03\u9686\u8fc7\u6ee4\u5668\u5b9e\u73b0\uff1a<\/p>\n<pre><code class=\"language-java\">\n@Configuration\npublic class BloomFilterConfig {\n    @Bean\n    public RBloomFilter&lt;Long&gt; userBloomFilter(RedissonClient redissonClient) {\n        RBloomFilter&lt;Long&gt; bloomFilter = redissonClient.getBloomFilter(&quot;user:bloom&quot;);\n        \/\/ \u521d\u59cb\u5316\uff1a\u9884\u8ba1\u5143\u7d20\u6570\u91cf 100 \u4e07\uff0c\u8bef\u5224\u7387 1%\n        bloomFilter.tryInit(1_000_000L, 0.01);\n        return bloomFilter;\n    }\n}\n\n@Service\npublic class UserService {\n    @Autowired\n    private RBloomFilter&lt;Long&gt; userBloomFilter;\n\n    @PostConstruct\n    public void initBloomFilter() {\n        \/\/ \u542f\u52a8\u65f6\u52a0\u8f7d\u6240\u6709\u7528\u6237 ID\uff08\u5b9e\u9645\u9879\u76ee\u53ef\u5206\u6279\u52a0\u8f7d\uff09\n        List&lt;Long&gt; allUserIds = userMapper.selectAllIds();\n        allUserIds.forEach(userBloomFilter::add);\n    }\n\n    public User getUserById(Long id) {\n        \/\/ 1. \u5e03\u9686\u8fc7\u6ee4\u5668\u62e6\u622a\n        if (!userBloomFilter.contains(id)) {\n            return null;\n        }\n        \/\/ 2. \u67e5\u8be2\u7f13\u5b58\uff08\u540c\u524d\uff09\n        \/\/ ...\n    }\n}\n<\/code><\/pre>\n<p>> <strong>\ud83d\udca1 \u6700\u4f73\u5b9e\u8df5<\/strong>\uff1a\u5e03\u9686\u8fc7\u6ee4\u5668\u5b58\u5728\u8bef\u5224\u7387\uff08\u53ef\u80fd\u628a\u4e0d\u5b58\u5728\u7684\u8bef\u5224\u4e3a\u5b58\u5728\uff09\uff0c\u4f46\u4e0d\u4f1a\u6f0f\u5224\u3002\u5bf9\u4e8e\u65b0\u589e\u6570\u636e\uff0c\u9700\u8981\u540c\u6b65\u66f4\u65b0\u5e03\u9686\u8fc7\u6ee4\u5668\uff08\u5982\u7528\u6237\u6ce8\u518c\u540e\u7acb\u5373 add\uff09\u3002<\/p>\n<h2>3. \u7f13\u5b58\u51fb\u7a7f\uff1a\u4e92\u65a5\u9501\u4e0e\u903b\u8f91\u8fc7\u671f<\/h2>\n<h3>\u573a\u666f\u590d\u73b0<\/h3>\n<p>\u67d0\u4e2a\u79d2\u6740\u5546\u54c1\u8be6\u60c5\u9875\uff0c\u7f13\u5b58 30 \u5206\u949f\u8fc7\u671f\u3002\u5f53\u7f13\u5b58\u8fc7\u671f\u77ac\u95f4\uff0c\u5927\u91cf\u5e76\u53d1\u8bf7\u6c42\u540c\u65f6\u5230\u8fbe\uff0c\u5168\u90e8\u53bb\u67e5\u6570\u636e\u5e93\uff0c\u5bfc\u81f4 DB \u538b\u529b\u9aa4\u589e\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e00\uff1a\u4e92\u65a5\u9501\uff08\u5206\u5e03\u5f0f\u9501\uff09<\/h3>\n<p>\u53ea\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u91cd\u5efa\u7f13\u5b58\uff0c\u5176\u4ed6\u7ebf\u7a0b\u7b49\u5f85\u5e76\u91cd\u8bd5\u3002<\/p>\n<pre><code class=\"language-java\">\npublic Product getProductById(Long id) {\n    String cacheKey = &quot;product:&quot; + id;\n    String cached = redisTemplate.opsForValue().get(cacheKey);\n    if (cached != null) {\n        return JSON.parseObject(cached, Product.class);\n    }\n    \/\/ \u83b7\u53d6\u5206\u5e03\u5f0f\u9501\n    String lockKey = &quot;lock:product:&quot; + id;\n    String lockValue = UUID.randomUUID().toString();\n    try {\n        Boolean locked = redisTemplate.opsForValue()\n            .setIfAbsent(lockKey, lockValue, 10, TimeUnit.SECONDS);\n        if (Boolean.TRUE.equals(locked)) {\n            \/\/ \u53cc\u91cd\u68c0\u67e5\uff1a\u53ef\u80fd\u5176\u4ed6\u7ebf\u7a0b\u5df2\u7ecf\u91cd\u5efa\u4e86\u7f13\u5b58\n            cached = redisTemplate.opsForValue().get(cacheKey);\n            if (cached != null) {\n                return JSON.parseObject(cached, Product.class);\n            }\n            Product product = productMapper.selectById(id);\n            if (product != null) {\n                redisTemplate.opsForValue().set(cacheKey, JSON.toJSONString(product), 30, TimeUnit.MINUTES);\n            }\n            return product;\n        } else {\n            \/\/ \u672a\u83b7\u53d6\u5230\u9501\uff0c\u77ed\u6682\u7b49\u5f85\u540e\u91cd\u8bd5\n            Thread.sleep(50);\n            return getProductById(id); \/\/ \u9012\u5f52\u91cd\u8bd5\uff0c\u6ce8\u610f\u63a7\u5236\u91cd\u8bd5\u6b21\u6570\n        }\n    } catch (InterruptedException e) {\n        Thread.currentThread().interrupt();\n        throw new RuntimeException(&quot;\u83b7\u53d6\u5546\u54c1\u4fe1\u606f\u5931\u8d25&quot;, e);\n    } finally {\n        \/\/ \u91ca\u653e\u9501\uff08\u4f7f\u7528 Lua \u811a\u672c\u4fdd\u8bc1\u539f\u5b50\u6027\uff09\n        String script = &quot;if redis.call(&#x27;get&#x27;, KEYS[1]) == ARGV[1] then return redis.call(&#x27;del&#x27;, KEYS[1]) else return 0 end&quot;;\n        redisTemplate.execute(new DefaultRedisScript&lt;&gt;(script, Long.class), Collections.singletonList(lockKey), lockValue);\n    }\n}\n<\/code><\/pre>\n<p>> <strong>\u6ce8\u610f<\/strong>\uff1a\u9012\u5f52\u91cd\u8bd5\u53ef\u80fd\u5bfc\u81f4\u6808\u6ea2\u51fa\uff0c\u5efa\u8bae\u4f7f\u7528\u5faa\u73af + \u6700\u5927\u91cd\u8bd5\u6b21\u6570\u3002\u53e6\u5916\u9501\u7684\u8d85\u65f6\u65f6\u95f4\u8981\u5408\u7406\uff0c\u907f\u514d\u4e1a\u52a1\u672a\u5b8c\u6210\u9501\u5c31\u91ca\u653e\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e8c\uff1a\u903b\u8f91\u8fc7\u671f\uff08\u6c38\u4e0d\u8fc7\u671f\uff09<\/h3>\n<p>\u7f13\u5b58\u4e0d\u8bbe\u7f6e\u7269\u7406\u8fc7\u671f\u65f6\u95f4\uff0c\u800c\u662f\u5c06\u8fc7\u671f\u65f6\u95f4\u5b58\u50a8\u5728 value \u4e2d\u3002\u83b7\u53d6\u65f6\u5224\u65ad\u662f\u5426\u903b\u8f91\u8fc7\u671f\uff0c\u82e5\u8fc7\u671f\u5219\u5f02\u6b65\u91cd\u5efa\uff0c\u540c\u65f6\u8fd4\u56de\u65e7\u6570\u636e\u3002<\/p>\n<pre><code class=\"language-java\">\n@Data\npublic class RedisData {\n    private Object data;\n    private LocalDateTime expireTime;\n}\n\npublic Product getProductWithLogicalExpire(Long id) {\n    String cacheKey = &quot;product:&quot; + id;\n    String cached = redisTemplate.opsForValue().get(cacheKey);\n    if (cached == null) {\n        \/\/ \u7f13\u5b58\u4e0d\u5b58\u5728\uff0c\u76f4\u63a5\u67e5\u5e93\u5e76\u5199\u5165\uff08\u53ef\u52a0\u9501\uff09\n        return loadFromDbAndCache(id);\n    }\n    RedisData redisData = JSON.parseObject(cached, RedisData.class);\n    Product product = JSON.parseObject(JSON.toJSONString(redisData.getData()), Product.class);\n    if (redisData.getExpireTime().isAfter(LocalDateTime.now())) {\n        return product; \/\/ \u672a\u8fc7\u671f\uff0c\u76f4\u63a5\u8fd4\u56de\n    }\n    \/\/ \u5df2\u8fc7\u671f\uff0c\u5c1d\u8bd5\u83b7\u53d6\u9501\u5f02\u6b65\u91cd\u5efa\n    String lockKey = &quot;lock:product:&quot; + id;\n    Boolean locked = redisTemplate.opsForValue().setIfAbsent(lockKey, &quot;1&quot;, 10, TimeUnit.SECONDS);\n    if (Boolean.TRUE.equals(locked)) {\n        \/\/ \u5f00\u542f\u65b0\u7ebf\u7a0b\u91cd\u5efa\u7f13\u5b58\n        executorService.submit(() -&gt; {\n            try {\n                Product fresh = productMapper.selectById(id);\n                RedisData newData = new RedisData();\n                newData.setData(fresh);\n                newData.setExpireTime(LocalDateTime.now().plusMinutes(30));\n                redisTemplate.opsForValue().set(cacheKey, JSON.toJSONString(newData));\n            } finally {\n                redisTemplate.delete(lockKey);\n            }\n        });\n    }\n    \/\/ \u65e0\u8bba\u662f\u5426\u83b7\u53d6\u9501\uff0c\u90fd\u8fd4\u56de\u65e7\u6570\u636e\n    return product;\n}\n<\/code><\/pre>\n<p>> <strong>\ud83d\udca1 \u9002\u7528\u573a\u666f<\/strong>\uff1a\u903b\u8f91\u8fc7\u671f\u9002\u5408\u5bf9\u6570\u636e\u4e00\u81f4\u6027\u8981\u6c42\u4e0d\u9ad8\u7684\u70ed\u70b9\u6570\u636e\uff08\u5982\u5546\u54c1\u8be6\u60c5\uff09\uff0c\u80fd\u4fdd\u8bc1\u9ad8\u53ef\u7528\uff0c\u4f46\u53ef\u80fd\u8fd4\u56de\u65e7\u6570\u636e\u3002<\/p>\n<h2>4. \u7f13\u5b58\u96ea\u5d29\uff1a\u968f\u673a\u8fc7\u671f + \u9ad8\u53ef\u7528 + \u7194\u65ad<\/h2>\n<h3>\u573a\u666f\u590d\u73b0<\/h3>\n<p>\u51cc\u6668\u6279\u91cf\u5bfc\u5165\u6570\u636e\u65f6\uff0c\u7ed9\u5927\u91cf Key \u8bbe\u7f6e\u4e86\u76f8\u540c\u7684\u8fc7\u671f\u65f6\u95f4\uff08\u5982 1 \u5c0f\u65f6\uff09\uff0c\u5bfc\u81f4\u4e00\u5c0f\u65f6\u540e\u6240\u6709 Key \u540c\u65f6\u5931\u6548\uff0c\u8bf7\u6c42\u5168\u90e8\u6d8c\u5411\u6570\u636e\u5e93\u3002\u6216\u8005 Redis \u96c6\u7fa4\u5b95\u673a\uff0c\u7f13\u5b58\u5c42\u5b8c\u5168\u5931\u6548\u3002<\/p>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e00\uff1a\u968f\u673a\u8fc7\u671f\u65f6\u95f4<\/h3>\n<p>\u5728\u57fa\u7840\u8fc7\u671f\u65f6\u95f4\u4e0a\u589e\u52a0\u968f\u673a\u503c\uff0c\u907f\u514d\u540c\u65f6\u5931\u6548\u3002<\/p>\n<pre><code class=\"language-java\">\npublic void setWithRandomExpire(String key, String value, long baseSeconds) {\n    \/\/ \u968f\u673a\u589e\u52a0 0~300 \u79d2\n    long expire = baseSeconds + ThreadLocalRandom.current().nextLong(300);\n    redisTemplate.opsForValue().set(key, value, expire, TimeUnit.SECONDS);\n}\n<\/code><\/pre>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e8c\uff1aRedis \u9ad8\u53ef\u7528<\/h3>\n<p>\u4f7f\u7528\u54e8\u5175\u6a21\u5f0f\u6216\u96c6\u7fa4\u6a21\u5f0f\uff0c\u907f\u514d\u5355\u70b9\u6545\u969c\u3002\u540c\u65f6\u53ef\u914d\u7f6e\u672c\u5730\u7f13\u5b58\uff08\u5982 Caffeine\uff09\u4f5c\u4e3a\u4e8c\u7ea7\u7f13\u5b58\uff0c\u5728 Redis \u4e0d\u53ef\u7528\u65f6\u964d\u7ea7\u3002<\/p>\n<pre><code class=\"language-java\">\n@Configuration\npublic class CacheConfig {\n    @Bean\n    public Cache&lt;String, Object&gt; localCache() {\n        return Caffeine.newBuilder()\n            .expireAfterWrite(10, TimeUnit.MINUTES)\n            .maximumSize(10_000)\n            .build();\n    }\n}\n\npublic User getUserWithLocalCache(Long id) {\n    String cacheKey = &quot;user:&quot; + id;\n    \/\/ 1. \u67e5\u672c\u5730\u7f13\u5b58\n    Object local = localCache.getIfPresent(cacheKey);\n    if (local != null) {\n        return (User) local;\n    }\n    \/\/ 2. \u67e5 Redis\n    String cached = redisTemplate.opsForValue().get(cacheKey);\n    if (cached != null) {\n        User user = JSON.parseObject(cached, User.class);\n        localCache.put(cacheKey, user);\n        return user;\n    }\n    \/\/ 3. \u67e5 DB\n    User user = userMapper.selectById(id);\n    if (user != null) {\n        redisTemplate.opsForValue().set(cacheKey, JSON.toJSONString(user), 30, TimeUnit.MINUTES);\n        localCache.put(cacheKey, user);\n    }\n    return user;\n}\n<\/code><\/pre>\n<h3>\u89e3\u51b3\u65b9\u6848\u4e09\uff1a\u7194\u65ad\u964d\u7ea7<\/h3>\n<p>\u5f53\u6570\u636e\u5e93\u538b\u529b\u8fc7\u5927\u65f6\uff0c\u901a\u8fc7\u7194\u65ad\u5668\uff08\u5982 Sentinel\uff09\u5feb\u901f\u5931\u8d25\uff0c\u8fd4\u56de\u515c\u5e95\u6570\u636e\u3002<\/p>\n<pre><code class=\"language-java\">\n@SentinelResource(value = &quot;getUser&quot;, blockHandler = &quot;handleBlock&quot;, fallback = &quot;fallback&quot;)\npublic User getUser(Long id) {\n    \/\/ \u6b63\u5e38\u4e1a\u52a1\u903b\u8f91\n}\n\npublic User handleBlock(Long id, BlockException ex) {\n    \/\/ \u9650\u6d41\u964d\u7ea7\u5904\u7406\n    return new User(id, &quot;\u9ed8\u8ba4\u7528\u6237&quot;, &quot;\u964d\u7ea7\u8fd4\u56de&quot;);\n}\n\npublic User fallback(Long id, Throwable t) {\n    \/\/ \u5f02\u5e38\u515c\u5e95\n    return new User(id, &quot;\u9ed8\u8ba4\u7528\u6237&quot;, &quot;\u5f02\u5e38\u515c\u5e95&quot;);\n}\n<\/code><\/pre>\n<h2>5. \u7efc\u5408\u5b9e\u6218\uff1a\u7f13\u5b58\u5de5\u5177\u7c7b\u5c01\u88c5<\/h2>\n<p>\u5c06\u4e0a\u8ff0\u7b56\u7565\u6574\u5408\u6210\u4e00\u4e2a\u901a\u7528\u7684\u7f13\u5b58\u5de5\u5177\u7c7b\uff0c\u652f\u6301\u7a7f\u900f\u3001\u51fb\u7a7f\u9632\u62a4\u3002<\/p>\n<pre><code class=\"language-java\">\n@Component\npublic class CacheHelper {\n    @Autowired\n    private RedisTemplate&lt;String, String&gt; redisTemplate;\n    @Autowired\n    private RedissonClient redissonClient;\n\n    private static final String NULL_VALUE = &quot;NULL&quot;;\n\n    public &lt;T&gt; T getWithCache(String key, Class&lt;T&gt; clazz, Supplier&lt;T&gt; dbLoader, long expireSeconds) {\n        \/\/ 1. \u67e5\u7f13\u5b58\n        String cached = redisTemplate.opsForValue().get(key);\n        if (cached != null) {\n            if (NULL_VALUE.equals(cached)) {\n                return null;\n            }\n            return JSON.parseObject(cached, clazz);\n        }\n        \/\/ 2. \u5206\u5e03\u5f0f\u9501\u9632\u51fb\u7a7f\n        RLock lock = redissonClient.getLock(&quot;lock:&quot; + key);\n        try {\n            if (lock.tryLock(3, 10, TimeUnit.SECONDS)) {\n                \/\/ \u53cc\u91cd\u68c0\u67e5\n                cached = redisTemplate.opsForValue().get(key);\n                if (cached != null) {\n                    return NULL_VALUE.equals(cached) ? null : JSON.parseObject(cached, clazz);\n                }\n                \/\/ 3. \u67e5\u6570\u636e\u5e93\n                T data = dbLoader.get();\n                if (data == null) {\n                    \/\/ \u7f13\u5b58\u7a7a\u503c\u9632\u7a7f\u900f\n                    redisTemplate.opsForValue().set(key, NULL_VALUE, 60, TimeUnit.SECONDS);\n                    return null;\n                }\n                \/\/ 4. \u968f\u673a\u8fc7\u671f\u65f6\u95f4\u9632\u96ea\u5d29\n                long expire = expireSeconds + ThreadLocalRandom.current().nextLong(300);\n                redisTemplate.opsForValue().set(key, JSON.toJSONString(data), expire, TimeUnit.SECONDS);\n                return data;\n            }\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        } finally {\n            if (lock.isHeldByCurrentThread()) {\n                lock.unlock();\n            }\n        }\n        \/\/ \u83b7\u53d6\u9501\u5931\u8d25\uff0c\u77ed\u6682\u7b49\u5f85\u540e\u91cd\u8bd5\uff08\u6216\u76f4\u63a5\u67e5\u5e93\uff0c\u6839\u636e\u4e1a\u52a1\u5bb9\u5fcd\u5ea6\uff09\n        try {\n            Thread.sleep(100);\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n        return getWithCache(key, clazz, dbLoader, expireSeconds);\n    }\n}\n<\/code><\/pre>\n<h2>6. \u5e38\u89c1\u5751\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h2>\n<ul>\n<li><strong>\u9501\u7684\u7c92\u5ea6<\/strong>\uff1a\u9501\u7684 key \u8981\u7cbe\u786e\u5230\u5177\u4f53\u6570\u636e ID\uff0c\u907f\u514d\u5927\u8303\u56f4\u9501\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n<li><strong>\u9501\u7684\u8d85\u65f6\u65f6\u95f4<\/strong>\uff1a\u4e00\u5b9a\u8981\u8bbe\u7f6e\uff0c\u4e14\u5927\u4e8e\u4e1a\u52a1\u6700\u5927\u6267\u884c\u65f6\u95f4\uff0c\u9632\u6b62\u6b7b\u9501\u3002<\/li>\n<li><strong>\u7a7a\u503c\u7f13\u5b58\u65f6\u95f4<\/strong>\uff1a\u4e0d\u5b9c\u8fc7\u957f\uff08\u5efa\u8bae 30~60 \u79d2\uff09\uff0c\u907f\u514d\u6570\u636e\u53d8\u66f4\u540e\u957f\u65f6\u95f4\u4e0d\u4e00\u81f4\u3002<\/li>\n<li><strong>\u5e03\u9686\u8fc7\u6ee4\u5668\u66f4\u65b0<\/strong>\uff1a\u65b0\u589e\u6570\u636e\u540e\u8981\u540c\u6b65\u6dfb\u52a0\uff0c\u5220\u9664\u6570\u636e\u65e0\u6cd5\u4ece\u5e03\u9686\u8fc7\u6ee4\u5668\u79fb\u9664\uff08\u53ef\u5b9a\u671f\u91cd\u5efa\uff09\u3002<\/li>\n<li><strong>\u903b\u8f91\u8fc7\u671f\u5b9e\u73b0<\/strong>\uff1a\u5f02\u6b65\u91cd\u5efa\u65f6\u6ce8\u610f\u7ebf\u7a0b\u6c60\u9694\u79bb\uff0c\u907f\u514d\u5f71\u54cd\u4e3b\u4e1a\u52a1\u3002<\/li>\n<li><strong>\u76d1\u63a7\u4e0e\u544a\u8b66<\/strong>\uff1a\u5bf9\u7f13\u5b58\u547d\u4e2d\u7387\u3001\u6570\u636e\u5e93 QPS \u8fdb\u884c\u76d1\u63a7\uff0c\u53ca\u65f6\u53d1\u73b0\u5f02\u5e38\u3002<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u662f Redis \u4f7f\u7528\u4e2d\u7684\u9ad8\u9891\u95ee\u9898\uff0c\u7406\u89e3\u5b83\u4eec\u7684\u672c\u8d28\u5e76\u638c\u63e1\u5bf9\u5e94\u7684\u89e3\u51b3\u65b9\u6848\uff0c\u662f\u6784\u5efa\u9ad8\u53ef\u7528\u7cfb\u7edf\u7684\u5fc5\u5907\u6280\u80fd\u3002\u672c\u6587\u4ece\u539f\u7406\u5230\u4ee3\u7801\uff0c\u7ed9\u51fa\u4e86\u5b8c\u6574\u7684\u5b9e\u6218\u6307\u5357\uff1a<\/p>\n<ul>\n<li><strong>\u7a7f\u900f<\/strong>\uff1a\u5e03\u9686\u8fc7\u6ee4\u5668 + \u7a7a\u503c\u7f13\u5b58<\/li>\n<li><strong>\u51fb\u7a7f<\/strong>\uff1a\u4e92\u65a5\u9501 + \u903b\u8f91\u8fc7\u671f<\/li>\n<li><strong>\u96ea\u5d29<\/strong>\uff1a\u968f\u673a\u8fc7\u671f + \u9ad8\u53ef\u7528 + \u7194\u65ad\u964d\u7ea7<\/li>\n<\/ul>\n<p>\u5efa\u8bae\u6839\u636e\u4e1a\u52a1\u573a\u666f\u7ec4\u5408\u4f7f\u7528\u8fd9\u4e9b\u7b56\u7565\uff0c\u5e76\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u901a\u8fc7\u538b\u6d4b\u9a8c\u8bc1\u6548\u679c\u3002\u4e0b\u4e00\u6b65\u53ef\u4ee5\u7814\u7a76\u591a\u7ea7\u7f13\u5b58\u67b6\u6784\uff08\u672c\u5730 + Redis + DB\uff09\u4ee5\u53ca\u7f13\u5b58\u4e00\u81f4\u6027\u65b9\u6848\uff08\u5982 Canal \u76d1\u542c binlog\uff09\u3002<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb<\/strong>\uff1a<\/p>\n<ul>\n<li>Redisson \u5b98\u65b9\u6587\u6863\uff08\u5206\u5e03\u5f0f\u9501\u4e0e\u5e03\u9686\u8fc7\u6ee4\u5668\uff09<\/li>\n<li>Spring Cache \u62bd\u8c61\u4e0e Redis \u96c6\u6210<\/li>\n<li>\u963f\u91cc\u5df4\u5df4 Sentinel \u7194\u65ad\u964d\u7ea7\u6307\u5357<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u662f Redis \u4f7f\u7528\u4e2d\u7684\u4e09\u5927\u7ecf\u5178\u95ee\u9898\u3002\u672c\u6587\u901a\u8fc7\u539f\u7406\u5256\u6790\u3001\u53ef\u8fd0\u884c\u4ee3\u7801\u793a\u4f8b\u548c\u5b9e\u6218\u8e29\u5751\u7ecf\u9a8c\uff0c\u624b\u628a\u624b\u6559\u4f60\u5982\u4f55\u8bbe\u8ba1\u9ad8\u53ef\u7528\u7f13\u5b58\u67b6\u6784\uff0c\u907f\u514d\u6570\u636e\u5e93\u88ab\u538b\u57ae\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[65,56,281,280,215],"class_list":["post-290","post","type-post","status-publish","format-standard","hentry","category-3","category-4","tag-redis","tag-spring-boot","tag-281","tag-280","tag-215"],"_links":{"self":[{"href":"https:\/\/yykcj.com\/index.php?rest_route=\/wp\/v2\/posts\/290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yykcj.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yykcj.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yykcj.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yykcj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=290"}],"version-history":[{"count":0,"href":"https:\/\/yykcj.com\/index.php?rest_route=\/wp\/v2\/posts\/290\/revisions"}],"wp:attachment":[{"href":"https:\/\/yykcj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yykcj.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yykcj.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}