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id=\"%e7%b7%a9%e5%ad%98%e7%a9%bf%e9%80%8f%e7%9a%84%e8%a7%a3%e6%b1%ba%e6%96%b9%e6%a1%88-oxltglVLUd\">\u7de9\u5b58\u7a7f\u900f\u7684\u89e3\u6c7a\u65b9\u6848<\/h2>\n<p>\u70ba\u4e86\u6709\u6548\u5730\u89e3\u6c7a\u7de9\u5b58\u7a7f\u900f\u554f\u984c\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e5%b8%83%e9%9a%86%e9%81%8e%e6%bf%be%e5%99%a8-oxltglVLUd\">1. 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id=\"2-%e7%b7%a9%e5%ad%98%e7%a9%ba%e7%b5%90%e6%9e%9c-oxltglVLUd\">2. \u7de9\u5b58\u7a7a\u7d50\u679c<\/h3>\n<p>\u5c0d\u65bc\u67e5\u8a62\u7d50\u679c\u70ba\u7a7a\u7684\u8acb\u6c42\uff0c\u53ef\u4ee5\u5c07\u9019\u4e9b\u8acb\u6c42\u7684\u7d50\u679c\u7de9\u5b58\u4e00\u6bb5\u6642\u9593\uff0c\u907f\u514d\u91cd\u8907\u67e5\u8a62\u6578\u64da\u5eab\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u7684\u8acb\u6c42\u6b21\u6578\u3002<\/p>\n<pre><code>\nif (result == null) {\n    cache.put(key, null, expirationTime);\n}\n<\/code><\/pre>\n<h3 id=\"3-%e9%99%90%e6%b5%81%e5%92%8c%e9%98%b2%e7%81%ab%e7%89%86-oxltglVLUd\">3. \u9650\u6d41\u548c\u9632\u706b\u7246<\/h3>\n<p>\u5c0d\u65bc\u53ef\u7591\u7684\u8acb\u6c42\uff0c\u53ef\u4ee5\u4f7f\u7528\u9650\u6d41\u6280\u8853\u4f86\u9650\u5236\u8acb\u6c42\u7684\u983b\u7387\uff0c\u4e26\u4f7f\u7528\u9632\u706b\u7246\u4f86\u963b\u64cb\u60e1\u610f\u8acb\u6c42\u3002<\/p>\n<h2 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