{"id":171387,"date":"2024-11-07T02:19:20","date_gmt":"2024-11-06T18:19:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171387\/"},"modified":"2024-11-07T02:19:21","modified_gmt":"2024-11-06T18:19:21","slug":"%e6%b7%ba%e8%ab%87%e5%b9%be%e7%a8%ae%e5%b8%b8%e8%a6%8b%e7%9a%84%e5%88%86%e4%bd%88%e5%bc%8fid","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171387\/","title":{"rendered":"\u6dfa\u8ac7\u5e7e\u7a2e\u5e38\u898b\u7684\u5206\u4f48\u5f0fID"},"content":{"rendered":"<h1 id=\"%e6%b7%ba%e8%ab%87%e5%b9%be%e7%a8%ae%e5%b8%b8%e8%a6%8b%e7%9a%84%e5%88%86%e4%bd%88%e5%bc%8fid-RCPxwbBmge\">\u6dfa\u8ac7\u5e7e\u7a2e\u5e38\u898b\u7684\u5206\u4f48\u5f0fID<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u552f\u4e00\u6a19\u8b58\u7b26\uff08ID\uff09\u7684\u751f\u6210\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u5206\u4f48\u5f0fID\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5728\u591a\u500b\u7cfb\u7d71\u6216\u670d\u52d9\u4e4b\u9593\u751f\u6210\u552f\u4e00\u7684\u6a19\u8b58\u7b26\uff0c\u4ee5\u907f\u514d\u91cd\u8907\u548c\u885d\u7a81\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u5e38\u898b\u7684\u5206\u4f48\u5f0fID\u751f\u6210\u65b9\u6cd5\uff0c\u4e26\u5206\u6790\u5b83\u5011\u7684\u512a\u7f3a\u9ede\u3002<\/p>\n<h2 id=\"1-uuid%ef%bc%88%e9%80%9a%e7%94%a8%e5%94%af%e4%b8%80%e8%ad%98%e5%88%a5%e7%a2%bc%ef%bc%89-RCPxwbBmge\">1. UUID\uff08\u901a\u7528\u552f\u4e00\u8b58\u5225\u78bc\uff09<\/h2>\n<p>UUID\uff08Universally Unique Identifier\uff09\u662f\u4e00\u7a2e\u6a19\u6e96\u7684\u8b58\u5225\u78bc\u683c\u5f0f\uff0c\u901a\u5e38\u753132\u500b\u5341\u516d\u9032\u5236\u6578\u5b57\u7d44\u6210\uff0c\u4e26\u4ee5\u4e94\u500b\u90e8\u5206\u7684\u5f62\u5f0f\u8868\u793a\uff0c\u4f8b\u5982\uff1a<code>123e4567-e89b-12d3-a456-426614174000<\/code>\u3002UUID\u7684\u751f\u6210\u4e0d\u4f9d\u8cf4\u65bc\u4e2d\u5fc3\u5316\u7684\u670d\u52d9\u5668\uff0c\u9019\u4f7f\u5f97\u5b83\u975e\u5e38\u9069\u5408\u65bc\u5206\u4f48\u5f0f\u7cfb\u7d71\u3002<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>UUID\u7684\u552f\u4e00\u6027\u975e\u5e38\u9ad8\uff0c\u5e7e\u4e4e\u4e0d\u6703\u767c\u751f\u78b0\u649e\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u7cfb\u7d71\u4e2d\u751f\u6210\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>UUID\u7684\u9577\u5ea6\u8f03\u9577\uff0c\u5c0d\u65bc\u9700\u8981\u5927\u91cfID\u7684\u7cfb\u7d71\u4f86\u8aaa\uff0c\u5b58\u5132\u548c\u50b3\u8f38\u7684\u6210\u672c\u8f03\u9ad8\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e9%9b%aa%e8%8a%b1%e7%ae%97%e6%b3%95%ef%bc%88snowflake%ef%bc%89-RCPxwbBmge\">2. \u96ea\u82b1\u7b97\u6cd5\uff08Snowflake\uff09<\/h2>\n<p>\u96ea\u82b1\u7b97\u6cd5\u662f\u4e00\u7a2e\u7531Twitter\u958b\u767c\u7684\u5206\u4f48\u5f0fID\u751f\u6210\u7b97\u6cd5\u3002\u5b83\u751f\u6210\u7684ID\u662f64\u4f4d\u7684\u6574\u6578\uff0c\u901a\u5e38\u7531\u6642\u9593\u6233\u3001\u5de5\u4f5c\u6a5f\u5668ID\u548c\u5e8f\u5217\u865f\u7d44\u6210\u3002\u9019\u6a23\u7684\u8a2d\u8a08\u4f7f\u5f97ID\u4e0d\u50c5\u552f\u4e00\uff0c\u9084\u80fd\u5920\u6839\u64da\u6642\u9593\u6392\u5e8f\u3002<\/p>\n<pre><code>\nclass Snowflake {\n    private long workerId; \/\/ \u5de5\u4f5c\u6a5f\u5668ID\n    private long datacenterId; \/\/ \u6578\u64da\u4e2d\u5fc3ID\n    private long sequence; \/\/ \u5e8f\u5217\u865f\n    private long lastTimestamp = -1L; \/\/ \u4e0a\u6b21\u751f\u6210ID\u7684\u6642\u9593\u6233\n\n    public synchronized long nextId() {\n        long timestamp = System.currentTimeMillis();\n        if (timestamp &lt; lastTimestamp) {\n            throw new RuntimeException(&quot;Clock moved backwards. Refusing to generate id&quot;);\n        }\n        if (lastTimestamp == timestamp) {\n            sequence = (sequence + 1) &amp; 0xFFF; \/\/ 4096\n        } else {\n            sequence = 0;\n        }\n        lastTimestamp = timestamp;\n        return ((timestamp &lt;&lt; 22) | (datacenterId &lt;&lt; 17) | (workerId &lt;&lt; 12) | sequence);\n    }\n}\n<\/code><\/pre>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u751f\u6210\u7684ID\u77ed\u5c0f\u4e14\u6709\u5e8f\uff0c\u9069\u5408\u7528\u65bc\u9700\u8981\u6392\u5e8f\u7684\u5834\u666f\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u9700\u8981\u914d\u7f6e\u5de5\u4f5c\u6a5f\u5668ID\u548c\u6578\u64da\u4e2d\u5fc3ID\uff0c\u5c0d\u65bc\u5c0f\u578b\u7cfb\u7d71\u4f86\u8aaa\u53ef\u80fd\u904e\u65bc\u8907\u96dc\u3002<\/li>\n<\/ul>\n<h2 id=\"3-%e5%9f%ba%e6%96%bc%e6%99%82%e9%96%93%e6%88%b3%e7%9a%84id-RCPxwbBmge\">3. \u57fa\u65bc\u6642\u9593\u6233\u7684ID<\/h2>\n<p>\u57fa\u65bc\u6642\u9593\u6233\u7684ID\u751f\u6210\u65b9\u6cd5\u662f\u6700\u7c21\u55ae\u7684\u4e00\u7a2e\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u4f7f\u7528\u7576\u524d\u7684\u6642\u9593\u6233\u4f5c\u70baID\u7684\u4e00\u90e8\u5206\uff0c\u4e26\u7d50\u5408\u5176\u4ed6\u96a8\u6a5f\u6578\u64da\u4f86\u4fdd\u8b49\u552f\u4e00\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5c07\u7576\u524d\u7684\u6beb\u79d2\u6642\u9593\u6233\u8207\u4e00\u500b\u96a8\u6a5f\u6578\u5b57\u7d50\u5408\u8d77\u4f86\u751f\u6210ID\u3002<\/p>\n<pre><code>\npublic String generateId() {\n    long timestamp = System.currentTimeMillis();\n    int randomNum = new Random().nextInt(1000); \/\/ \u751f\u62100-999\u7684\u96a8\u6a5f\u6578\n    return timestamp + \"-\" + randomNum;\n}\n<\/code><\/pre>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u5be6\u73fe\u7c21\u55ae\uff0c\u751f\u6210\u901f\u5ea6\u5feb\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u5728\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u6703\u51fa\u73feID\u885d\u7a81\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e8%87%aa%e5%a2%9eid-RCPxwbBmge\">4. \u81ea\u589eID<\/h2>\n<p>\u81ea\u589eID\u662f\u6700\u50b3\u7d71\u7684ID\u751f\u6210\u65b9\u5f0f\uff0c\u901a\u5e38\u7531\u6578\u64da\u5eab\u81ea\u52d5\u751f\u6210\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u55ae\u4e00\u6578\u64da\u5eab\u4e2d\u975e\u5e38\u6709\u6548\uff0c\u4f46\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\u5247\u9762\u81e8\u6311\u6230\u3002<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\u7c21\u55ae\u6613\u7528\uff0c\u4e14\u5728\u55ae\u4e00\u6578\u64da\u5eab\u4e2d\u4fdd\u8b49\u552f\u4e00\u6027\u3002<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u4e2d\uff0c\u96e3\u4ee5\u4fdd\u8b49\u552f\u4e00\u6027\uff0c\u4e26\u4e14\u53ef\u80fd\u6210\u70ba\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-RCPxwbBmge\">\u7e3d\u7d50<\/h2>\n<p>\u5728\u9078\u64c7\u5206\u4f48\u5f0fID\u751f\u6210\u65b9\u6cd5\u6642\uff0c\u9700\u8981\u6839\u64da\u5177\u9ad4\u7684\u61c9\u7528\u5834\u666f\u548c\u9700\u6c42\u4f86\u9032\u884c\u9078\u64c7\u3002UUID\u9069\u5408\u9700\u8981\u9ad8\u552f\u4e00\u6027\u7684\u5834\u666f\uff0c\u96ea\u82b1\u7b97\u6cd5\u5247\u9069\u5408\u9700\u8981\u6392\u5e8f\u7684\u60c5\u6cc1\uff0c\u800c\u57fa\u65bc\u6642\u9593\u6233\u548c\u81ea\u589eID\u5247\u9069\u5408\u7c21\u55ae\u7684\u61c9\u7528\u3002\u7121\u8ad6\u9078\u64c7\u54ea\u7a2e\u65b9\u6cd5\uff0c\u4e86\u89e3\u5176\u512a\u7f3a\u9ede\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u8a0e\u5e7e\u7a2e\u5e38\u898b\u7684\u5206\u4f48\u5f0fID\u751f\u6210\u7b56\u7565\uff0c\u5305\u62ecUUID\u3001Twitter Snowflake\u7b49\uff0c\u5206\u6790\u5176\u7279\u9ede\u8207\u61c9\u7528\u5834\u666f\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-171387","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171387","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=171387"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171387\/revisions"}],"predecessor-version":[{"id":171388,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171387\/revisions\/171388"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}