{"id":185828,"date":"2024-11-11T00:50:24","date_gmt":"2024-11-10T16:50:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185828\/"},"modified":"2024-11-11T00:50:25","modified_gmt":"2024-11-10T16:50:25","slug":"%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e7%a0%b4%e8%a7%a3java%e4%b8%adredis%e6%95%b8%e6%93%9a%e9%81%8e%e6%9c%9f%e5%95%8f%e9%a1%8c%ef%bc%88redisjava%e9%81%8e%e6%9c%9f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185828\/","title":{"rendered":"\u6578\u64da\u8655\u7406\u7834\u89e3Java\u4e2dRedis\u6578\u64da\u904e\u671f\u554f\u984c\uff08redisjava\u904e\u671f\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e7%a0%b4%e8%a7%a3java%e4%b8%adredis%e6%95%b8%e6%93%9a%e9%81%8e%e6%9c%9f%e5%95%8f%e9%a1%8c%ef%bc%88redisjava%e9%81%8e%e6%9c%9f%ef%bc%89-QmUYTGFpDi\">\u6578\u64da\u8655\u7406\u7834\u89e3Java\u4e2dRedis\u6578\u64da\u904e\u671f\u554f\u984c\uff08redisjava\u904e\u671f\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u61c9\u7528\u7a0b\u5f0f\u958b\u767c\u4e2d\uff0cRedis\u4f5c\u70ba\u4e00\u7a2e\u9ad8\u6548\u7684\u9375\u503c\u5b58\u5132\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u6578\u64da\u7de9\u5b58\u548c\u5373\u6642\u6578\u64da\u8655\u7406\u3002\u7136\u800c\uff0cRedis\u7684\u6578\u64da\u904e\u671f\u6a5f\u5236\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u80fd\u6703\u5c0e\u81f4\u958b\u767c\u8005\u9762\u81e8\u6311\u6230\uff0c\u7279\u5225\u662f\u5728Java\u74b0\u5883\u4e2d\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u8655\u7406Redis\u4e2d\u7684\u6578\u64da\u904e\u671f\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u89e3\u6c7a\u65b9\u6848\u548c\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n<h2 id=\"redis%e6%95%b8%e6%93%9a%e9%81%8e%e6%9c%9f%e6%a9%9f%e5%88%b6%e6%a6%82%e8%bf%b0-QmUYTGFpDi\">Redis\u6578\u64da\u904e\u671f\u6a5f\u5236\u6982\u8ff0<\/h2>\n<p>Redis\u652f\u6301\u70ba\u6bcf\u500b\u9375\u8a2d\u7f6e\u904e\u671f\u6642\u9593\uff0c\u9019\u610f\u5473\u8457\u5728\u6307\u5b9a\u7684\u6642\u9593\u5f8c\uff0c\u8a72\u9375\u53ca\u5176\u5c0d\u61c9\u7684\u503c\u5c07\u81ea\u52d5\u88ab\u522a\u9664\u3002\u9019\u4e00\u7279\u6027\u5c0d\u65bc\u9700\u8981\u5b9a\u671f\u6e05\u7406\u904e\u671f\u6578\u64da\u7684\u61c9\u7528\u7a0b\u5f0f\u4f86\u8aaa\u975e\u5e38\u6709\u7528\u3002\u7136\u800c\uff0c\u9019\u4e5f\u53ef\u80fd\u5c0e\u81f4\u4e00\u4e9b\u554f\u984c\uff0c\u7279\u5225\u662f\u5728\u591a\u7dda\u7a0b\u6216\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u7576\u4e00\u500b\u7dda\u7a0b\u8a66\u5716\u8a2a\u554f\u5df2\u904e\u671f\u7684\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u7570\u5e38\u6216\u4e0d\u4e00\u81f4\u7684\u72c0\u614b\u3002<\/p>\n<h2 id=\"java%e4%b8%adredis%e6%95%b8%e6%93%9a%e9%81%8e%e6%9c%9f%e7%9a%84%e6%8c%91%e6%88%b0-QmUYTGFpDi\">Java\u4e2dRedis\u6578\u64da\u904e\u671f\u7684\u6311\u6230<\/h2>\n<p>\u5728Java\u4e2d\u4f7f\u7528Redis\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u5e7e\u500b\u6311\u6230\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\u554f\u984c\uff1a<\/strong>\u7576\u6578\u64da\u904e\u671f\u6642\uff0c\u5176\u4ed6\u7dda\u7a0b\u53ef\u80fd\u4ecd\u7136\u5728\u4f7f\u7528\u8a72\u6578\u64da\uff0c\u9019\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002<\/li>\n<li><strong>\u7570\u5e38\u8655\u7406\uff1a<\/strong>\u5982\u679c\u61c9\u7528\u7a0b\u5f0f\u672a\u80fd\u59a5\u5584\u8655\u7406\u904e\u671f\u6578\u64da\u7684\u60c5\u6cc1\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4NullPointerException\u7b49\u7570\u5e38\u3002<\/li>\n<li><strong>\u6027\u80fd\u5f71\u97ff\uff1a<\/strong>\u983b\u7e41\u6aa2\u67e5\u6578\u64da\u662f\u5426\u904e\u671f\u53ef\u80fd\u6703\u5f71\u97ff\u61c9\u7528\u7a0b\u5f0f\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-QmUYTGFpDi\">\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u89e3\u6c7a\u4e0a\u8ff0\u554f\u984c\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8003\u616e\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8redis%e7%9a%84ttl%e5%91%bd%e4%bb%a4-QmUYTGFpDi\">1. \u4f7f\u7528Redis\u7684TTL\u547d\u4ee4<\/h3>\n<p>\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Redis\u7684TTL\uff08Time To Live\uff09\u547d\u4ee4\u4f86\u6aa2\u67e5\u67d0\u500b\u9375\u7684\u5269\u9918\u751f\u5b58\u6642\u9593\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u8a2a\u554f\u6578\u64da\u4e4b\u524d\uff0c\u5148\u78ba\u8a8d\u8a72\u6578\u64da\u662f\u5426\u4ecd\u7136\u6709\u6548\u3002<\/p>\n<pre><code>Jedis jedis = new Jedis(\"localhost\");\nString key = \"exampleKey\";\nLong ttl = jedis.ttl(key);\nif (ttl &gt; 0) {\n    \/\/ \u6578\u64da\u4ecd\u7136\u6709\u6548\n    String value = jedis.get(key);\n} else {\n    \/\/ \u6578\u64da\u5df2\u904e\u671f\n}<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8%e8%a8%82%e9%96%b1-%e7%99%bc%e5%b8%83%e6%a8%a1%e5%bc%8f-QmUYTGFpDi\">2. \u4f7f\u7528\u8a02\u95b1\/\u767c\u5e03\u6a21\u5f0f<\/h3>\n<p>Redis\u7684\u8a02\u95b1\/\u767c\u5e03\u6a21\u5f0f\u53ef\u4ee5\u7528\u4f86\u901a\u77e5\u61c9\u7528\u7a0b\u5f0f\u67d0\u500b\u9375\u7684\u904e\u671f\u4e8b\u4ef6\u3002\u9019\u6a23\uff0c\u7576\u6578\u64da\u904e\u671f\u6642\uff0c\u61c9\u7528\u7a0b\u5f0f\u53ef\u4ee5\u53ca\u6642\u7372\u53d6\u901a\u77e5\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8655\u7406\u3002<\/p>\n<pre><code>Jedis jedis = new Jedis(\"localhost\");\njedis.psubscribe(new JedisPubSub() {\n    @Override\n    public void onPMessage(String pattern, String channel, String message) {\n        \/\/ \u8655\u7406\u904e\u671f\u901a\u77e5\n    }\n}, \"__key*__:*\"); \/\/ \u8a02\u95b1\u6240\u6709\u9375\u7684\u904e\u671f\u4e8b\u4ef6<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%9c%ac%e5%9c%b0%e7%b7%a9%e5%ad%98-QmUYTGFpDi\">3. \u4f7f\u7528\u672c\u5730\u7de9\u5b58<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u672c\u5730\u7de9\u5b58\u4f86\u6e1b\u5c11\u5c0dRedis\u7684\u983b\u7e41\u8a2a\u554f\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u6e1b\u5c11\u904e\u671f\u6578\u64da\u5e36\u4f86\u7684\u5f71\u97ff\u3002<\/p>\n<pre><code>Map localCache = new HashMap();\nString key = \"exampleKey\";\nif (localCache.containsKey(key)) {\n    String value = localCache.get(key);\n} else {\n    String value = jedis.get(key);\n    localCache.put(key, value);\n}<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-QmUYTGFpDi\">\u7d50\u8ad6<\/h2>\n<p>\u5728Java\u4e2d\u8655\u7406Redis\u6578\u64da\u904e\u671f\u554f\u984c\u4e26\u975e\u6613\u4e8b\uff0c\u4f46\u901a\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u4f7f\u7528Redis\u63d0\u4f9b\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6e1b\u5c11\u904e\u671f\u6578\u64da\u5e36\u4f86\u7684\u5f71\u97ff\u3002\u958b\u767c\u8005\u61c9\u6839\u64da\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\u9078\u64c7\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u61c9\u7528\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u65bcVPS\u548c\u4f3a\u670d\u5668\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u6211\u5011\u63d0\u4f9b\u5404\u7a2e\u9999\u6e2fVPS\u548c\u96f2\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\uff0c\u52a9\u60a8\u8f15\u9b06\u61c9\u5c0d\u5404\u7a2e\u6578\u64da\u8655\u7406\u6311\u6230\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u5728Java\u4e2d\u6709\u6548\u8655\u7406Redis\u6578\u64da\u904e\u671f\u554f\u984c\uff0c\u7834\u89e3\u5e38\u898b\u6311\u6230\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-185828","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=185828"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185828\/revisions"}],"predecessor-version":[{"id":185829,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185828\/revisions\/185829"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185828"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185828"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}