{"id":10008362,"date":"2024-02-18T21:00:21","date_gmt":"2024-02-18T13:00:21","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008362"},"modified":"2024-02-18T21:00:21","modified_gmt":"2024-02-18T13:00:21","slug":"%e7%b3%9f%e7%b3%95%ef%bc%8c%e8%a2%absimpledateformat%e5%9d%91%e5%88%b0%e5%95%a6%ef%bc%81-%e4%ba%ac%e4%b8%9c%e4%ba%91%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008362","title":{"rendered":"\u7cdf\u7cd5\uff0c\u88abSimpleDateFormat\u5751\u5230\u5566\uff01| \u4eac\u4e1c\u4e91\u6280\u672f\u56e2\u961f"},"content":{"rendered":"

1. \u95ee\u9898\u80cc\u666f<\/h3>\n

\u95ee\u9898\u7684\u80cc\u666f\u662f\u8fd9\u6837\u7684\uff0c\u5728\u6700\u8fd1\u9700\u6c42\u5f00\u53d1\u4e2d\u9047\u5230\u9700\u8981\u5c06\u7ed9\u5b9a\u76ee\u6807\u6570\u636e<\/strong>\u901a\u8fc7\u67d0\u4e00\u56fa\u5b9a\u7684\u8ba1\u91cf\u89c4\u5219<\/strong>\u8fdb\u884c\u8fc7\u6ee4\u5e76\u6253\u6807\u751f\u6210\u660e\u7ec6\u6570\u636e<\/strong>\uff0c\u5176\u4e2d\u53d1\u73b0\u5b58\u5728\u4e00\u7b14\u76ee\u6807\u6570\u636e<\/strong>\u7684\u65f6\u95f4\u5728\u4e0d\u7b26\u5408<\/strong>\u73b0\u6709\u65e5\u671f\u89c4\u5219<\/strong>\u7684\u6761\u4ef6\u4e0b\uff0c\u8fd8\u662f\u901a\u8fc7\u4e86\u89c4\u5219\u5f15\u64ce\u7684\u5339\u914d\u6253\u6807\u64cd\u4f5c\u3002\u6545\u800c\u9700\u8981\u5bf9\u8be5\u9519\u8bef\u5339\u914d\u573a\u666f<\/strong>\u8fdb\u884c\u6392\u67e5\uff0c\u5b9a\u4f4d<\/strong>\u5176\u6839\u672c\u539f\u56e0<\/strong>\u6240\u5728\u3002<\/p>\n

2. \u6392\u67e5\u601d\u8def<\/h3>\n

2.1 \u6570\u636e\u5b9a\u4f4d<\/h4>\n

\u5728\u5f00\u59cb\u6392\u67e5\u95ee\u9898\u4e4b\u521d\uff0c\u5148\u5047\u5b9a\u73b0\u6709\u7684Aviator\u89c4\u5219\u5f15\u64ce<\/strong>\u80fd\u591f\u5bf9\u73b0\u6709\u7684\u6570\u636e\u8fdb\u884c\u6b63\u5e38\u7684\u5339\u914d\u6253\u6807\uff0c\u67e5\u8be2\u5728\u5b58\u5728\u95ee\u9898\u6570\u636e\uff08\u56fe\u4e2d\u7ea2\u6846\u6240\u793a\uff09\u540c\u4e00\u65f6\u523b\u8fdb\u884c\u89c4\u5219\u5339\u914d\u65f6\u7684\u6570\u636e\u90fd\u6709\u54ea\u4e9b\u3002\u53d1\u73b0\u5b58\u5728\u4e94\u7b14\u6570\u636e\u5728\u540c\u4e00\u65f6\u523b\u8fdb\u884c\u89c4\u5219\u5339\u914d\u843d\u5e93\u3002<\/p>\n

\"\"<\/p>\n

\u7ee7\u7eed\u67e5\u8be2\u5177\u4f53\u7684\u5339\u914d\u89c4\u5219\u8868\u8fbe\u5f0f<\/strong>\uff0c\u53d1\u73b0\u9488\u5bf9loanPayTime<\/strong>\u65f6\u95f4\u533a\u95f4\u5728[2022-07-16 00:00:00, 2023-05-11 23:59:59]<\/strong>\u7684\u8303\u56f4\u5185\u8fdb\u884c\u5339\u914d\uff0c\u76ee\u6807\u6570\u636e<\/strong>\u7684\u65f6\u95f4\u4e3a2023-09-19 11:27:29<\/strong>\uff0c\u7406\u8bba\u4e0a\u5e94\u8be5\u4e0d\u4f1a\u88ab\u5339\u914d\u5230\u3002<\/p>\n

\"\"<\/p>\n

\u4f46\u662f\u89c2\u6d4b\u5339\u914d\u6253\u6807\u7684\u660e\u7ec6\u6570\u636e\u53d1\u73b0\u786e\u5b9e\u6253\u6807\u6210\u529f<\/strong>\u4e86\uff08\u5982\u7ea2\u6846\u6240\u793a\uff09\u3002<\/p>\n

\"\"<\/p>\n

\u6240\u4ee5\u91cd\u65b0<\/strong>\u56de\u5230\u6700\u521d\u7684\u548c\u76ee\u6807\u6570\u636e\u540c\u65f6\u843d\u5e93\u7684\u4e94\u7b14\u6570\u636e<\/strong>\u53d1\u73b0\uff0c\u8fd9\u4e94\u7b14\u6570\u636e\u7684loanPayTime<\/strong>\u65f6\u95f4\u786e\u5b9e\u5728\u89c4\u5219[2022-07-16 00:00:00, 2023-05-11 23:59:59]<\/strong>\u4e4b\u5185\uff0c\u6240\u4ee5\u5728\u60f3\u6709\u6ca1\u6709\u53ef\u80fd<\/strong>\u662f\u5728\u76ee\u6807\u6570\u636e\u5339\u914d\u89c4\u5219\u5f15\u64ce\u524d<\/strong>\uff0c\u5176\u5b83\u7684\u4e94\u7b14\u6570\u636e\u4e2d\u7684\u5176\u4e2d\u4e00\u7b14\u5bf9\u8be5\u6570\u636e\u8fdb\u884c\u4e86\u4fee\u6539<\/strong>\u5bfc\u81f4\u8bef\u5339\u914d<\/strong>\u5230\u4e86\u8fd9\u4e2a\u89c4\u5219\u3002\u987a\u7740\u8fd9\u4e2a\u601d\u8def\uff0c\u9996\u5148\u9700\u8981\u786e\u8ba4\u4e0bAviator\u89c4\u5219\u5f15\u64ce\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u662f\u5426\u7ebf\u7a0b\u5b89\u5168<\/strong>\u7684\u3002<\/p>\n

\"\"<\/p>\n

2.2 \u89c4\u5219\u5f15\u64ce<\/h4>\n

\u7531\u4e8e\u5728\u9700\u6c42\u4e2d\u4f7f\u7528\u5230\u7528\u4e8e\u7ed9\u6570\u636e\u5339\u914d\u6253\u6807\u7684\u662fAviator\u89c4\u5219\u5f15\u64ce<\/strong>\uff0c\u6240\u4ee5\u7b2c\u4e00\u76f4\u89c9\u662f\u6000\u7591Aviator\u89c4\u5219\u5f15\u64ce\u5728\u5e76\u53d1\u7684\u573a\u666f\u4e2d\u53ef\u80fd\u4f1a\u5b58\u5728\u7ebf\u7a0b\u4e0d\u5b89\u5168<\/strong>\u7684\u60c5\u51b5\u3002<\/p>\n

\"\"<\/p>\n

\u9996\u5148\u7b80\u5355\u4ecb\u7ecd\u4e0bAviator\u89c4\u5219\u5f15\u64ce\u662f\u4ec0\u4e48\uff0cAviator\u662f\u4e00\u4e2a\u9ad8\u6027\u80fd<\/strong>\u7684\u3001\u8f7b\u91cf\u7ea7<\/strong>\u7684java\u8bed\u8a00\u5b9e\u73b0\u7684\u8868\u8fbe\u5f0f\u6c42\u503c\u5f15\u64ce\uff0c\u4e3b\u8981\u7528\u4e8e\u5404\u79cd\u8868\u8fbe\u5f0f\u7684\u52a8\u6001\u6c42\u503c\uff0c\u76f8\u8f83\u4e8e\u5176\u5b83\u7684\u5f00\u6e90\u53ef\u7528\u7684\u89c4\u5219\u5f15\u64ce\u800c\u8a00\uff0cAviator\u7684\u8bbe\u8ba1\u76ee\u6807\u662f\u8f7b\u91cf\u7ea7<\/code>\u548c\u9ad8\u6027\u80fd<\/code> \uff0c\u76f8\u6bd4\u4e8eGroovy\u3001JRuby\u7684\u7b28\u91cd\uff0cAviator\u975e\u5e38\u5c0f\uff0c\u52a0\u4e0a\u4f9d\u8d56\u5305\u4e5f\u624d450<\/strong>K,\u4e0d\u7b97\u4f9d\u8d56\u5305\u7684\u8bdd\u53ea\u670970<\/strong>K\uff1b<\/p>\n

\u5f53\u7136\uff0cAviator\u7684\u8bed\u6cd5\u662f\u53d7\u9650\u7684\uff0c\u5b83\u4e0d\u662f\u4e00\u95e8\u5b8c\u6574\u7684\u8bed\u8a00\uff0c\u800c\u53ea\u662f\u8bed\u8a00\u7684\u4e00\u5c0f\u90e8\u5206\u96c6\u5408\u3002\u5176\u6b21\uff0cAviator\u7684\u5b9e\u73b0\u601d\u8def\u4e0e\u5176\u4ed6\u8f7b\u91cf\u7ea7\u7684\u6c42\u503c\u5668\u5f88\u4e0d\u76f8\u540c\uff0c\u5176\u4ed6\u6c42\u503c\u5668\u4e00\u822c\u90fd\u662f\u901a\u8fc7\u89e3\u91ca\u7684\u65b9\u5f0f\u8fd0\u884c\uff0c\u800cAviator\u5219\u662f\u76f4\u63a5\u5c06\u8868\u8fbe\u5f0f\u7f16\u8bd1\u6210Java\u5b57\u8282\u7801<\/code>\uff0c\u4ea4\u7ed9JVM\u53bb\u6267\u884c\u3002\u7b80\u5355\u6765\u8bf4\uff0cAviator\u7684\u5b9a\u4f4d\u662f\u4ecb\u4e8eGroovy\u8fd9\u6837\u7684\u91cd\u91cf\u7ea7\u811a\u672c\u8bed\u8a00\u548cIKExpression\u8fd9\u6837\u7684\u8f7b\u91cf\u7ea7\u8868\u8fbe\u5f0f\u5f15\u64ce\u4e4b\u95f4\u3002\uff08\u5177\u4f53Aviator\u7684\u76f8\u5173\u4ecb\u7ecd\u4e0d\u662f\u672c\u6587\u7684\u91cd\u70b9\uff0c\u5177\u4f53\u53ef\u53c2\u89c1<\/a>\uff09<\/p>\n

\u901a\u8fc7\u67e5\u9605\u76f8\u5173\u8d44\u6599\u53d1\u73b0\uff0cAviator\u4e2d\u7684AviatorEvaluator.execute() \u65b9\u6cd5\u672c\u8eab\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ea\u8981\u8868\u8fbe\u5f0f\u6267\u884c\u903b\u8f91\u548c\u4f20\u5165\u7684env\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff0c\u7406\u8bba\u4e0a\u662f\u4e0d\u4f1a\u51fa\u73b0\u5e76\u53d1\u573a\u666f\u4e0b\u7ebf\u7a0b\u4e0d\u5b89\u5168\u95ee\u9898\u7684\u3002\uff08\u8be6\u89c1<\/a>\uff09<\/p>\n

2.3 \u5339\u914d\u89c4\u5219\u5f15\u64ce\u7684env<\/h4>\n

\"\"<\/p>\n

\u901a\u8fc7\u524d\u9762Aviator\u7684\u76f8\u5173\u8d44\u6599\u53d1\u73b0\u4f20\u5165\u7684env<\/strong>\u5982\u679c\u5728\u591a\u7ebf\u7a0b\u573a\u666f\u4e0b\u4e0d\u5b89\u5168\u4e5f\u4f1a\u5bfc\u81f4\u6700\u7ec8\u7684\u7ed3\u679c\u662f\u9519\u8bef\u7684\uff0c\u6545\u800c\u5b9a\u4f4d\u4f7f\u7528\u7684env\u53d1\u73b0\u4f7f\u7528\u7684\u662fHashMap<\/strong>\uff0c\u8be5\u96c6\u5408\u7c7b\u786e\u5b9e\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\uff08\u5177\u4f53\u53ef\u8be6\u89c1<\/a>\uff09\uff0c\u4f46\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u524d\u63d0\u662f\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5bf9\u5176\u8fdb\u884c\u4fee\u6539\uff0c\u5b9a\u4f4d\u4ee3\u7801\u53d1\u73b0\u5728\u6bcf\u6b21\u8c03\u7528\u65b9\u5f0f\u65f6\u90fd\u4f1a\u91cd\u65b0\u751f\u6210<\/strong>\u4e00\u4e2aHashMap\uff0c\u6545\u800c\u5e94\u8be5\u4e0d\u4f1a<\/strong>\u662f\u7531\u4e8e\u8fd9\u4e2a\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7c7b\u5bfc\u81f4\u7684\u3002<\/p>\n

\"\"<\/p>\n

\u7ee7\u7eed\u5b9a\u4f4d\u53d1\u73b0\uff0cloanPayTime<\/strong>\u8fd9\u4e2a\u5b57\u6bb5\u5728\u8fdb\u884cAviator\u89c4\u5219\u5f15\u64ce\u5339\u914d\u524d\u4f7f\u7528SimpleDateFormat<\/strong>\u8fdb\u884c\u4e86\u683c\u5f0f\u5316\uff0c\u6240\u4ee5\u6709\u53ef\u80fd<\/strong>\u662f\u7531\u4e8e\u8be5\u7c7b\u7684\u7ebf\u7a0b\u4e0d\u5b89\u5168<\/strong>\u5bfc\u81f4\u7684\u6570\u636e\u9519\u4e71<\/strong>\u95ee\u9898\uff0c\u4f46\u662f\u8fd9\u4e2a\u7c7b\u5e94\u8be5\u53ea\u662f\u5bf9\u65e5\u671f\u8fdb\u884c\u683c\u5f0f\u5316\u5904\u7406\uff0c\u96be\u4e0d\u6210\u8fd8\u80fd\u5f71\u54cd\u6700\u7ec8\u7684\u6570\u636e\u3002\u5e26\u7740\u8fd9\u4e2a\u7591\u95ee\u67e5\u8be2\u8d44\u6599\u53d1\u73b0\uff0cemm\u786e\u5b9e\u662f\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u3002<\/p>\n

\"\"<\/p>\n

\u597d\u5bb6\u4f19\uff0c\u5acc\u7591\u5bf9\u8c61<\/strong>\u76ee\u524d\u5df2\u7ecf\u6709\u4e86\uff0c\u73b0\u5728\u5c31\u662f\u5bfb\u627e\u76f8\u5173\u8bc1\u636e\u6765\u4f50\u8bc1<\/strong>\u4e86\u3002<\/p>\n

3. SimpleDateFormat \u8fd8\u80fd\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff1f<\/h3>\n

3.1 \u5148\u5199\u4e2ademo\u8bd5\u8bd5<\/h4>\n

\u8bdd\u4e0d\u591a\u8bf4\uff0c\u76f4\u63a5\u53bb\u6d4b\u8bd5\u4e00\u4e0b\u5728\u5e76\u53d1\u573a\u666f<\/strong>\u4e0b\uff0cSimpleDateFormat\u7c7b\u4f1a\u4e0d\u4f1a\u5bf9\u9700\u8981\u683c\u5f0f\u5316\u7684\u65e5\u671f\u8fdb\u884c\u9519\u4e71<\/strong>\u683c\u5f0f\u5316\u3002\u5148\u6a21\u62df\u4e00\u4e2a\u573a\u666f\uff0c\u5bf9\u591a\u7ebf\u7a0b\u5e76\u53d1\u573a\u666f\u4e0b\u683c\u5f0f\u5316\u65e5\u671f\uff0c\u5373\u5728[0,9]<\/strong>\u7684\u6570\u636e\u8303\u56f4\u5185\uff0c\u5728\u5076\u6570<\/strong>\u60c5\u51b5\u4e0b\u5bf92024\u5e741\u670823\u65e5\u8fdb\u884c\u683c\u5f0f\u5316\uff0c\u5728\u5947\u6570<\/strong>\u60c5\u51b5\u4e0b\u5bf92024\u5e741\u670822\u65e5\u8fdb\u884c\u683c\u5f0f\u5316\uff0c\u7136\u540e\u89c2\u6d4b\u65e5\u5fd7\u6253\u5370\u6548\u679c\u3002<\/p>\n

import java.text.SimpleDateFormat;\nimport java.time.Duration;\nimport java.time.LocalDateTime;\nimport java.util.Date;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.TimeUnit;\npublic class ThreadSafeDateFormatDemo {\n    static SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");\n\n\n    public static void main(String[] args) {\n        ExecutorService executor = Executors.newFixedThreadPool(10);\n        LocalDateTime startDateTime = LocalDateTime.now();\n        Date date = new Date();\n        for (int i = 0; i < 1000; i++) {\n            int finalI = i;\n            executor.submit(() -> {\n                try {\n                    if (finalI % 2 == 0) {\n\n                        String formattedDate = dateFormat.format(date);\n                        \/\/\u7b2c\u4e00\u79cd\n\/\/                        String formattedDate = DateUtil.formatDate(date);\n                        \/\/\u7b2c\u4e8c\u79cd\n\/\/                        String formattedDate = DateSyncUtil.formatDate(date);\n                        \/\/\u7b2c\u4e09\u79cd\n\/\/                        String formattedDate = ThreadLocalDateUtil.formatDate(date);\n                        System.out.println("\u7ebf\u7a0b " + Thread.currentThread().getName() + " \u65f6\u95f4\u4e3a: " + formattedDate + " \u5076\u6570i:" + finalI);\n                    } else {\n                        Date now = new Date();\n                        now.setTime(now.getTime() - TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS));\n                        String formattedDate = dateFormat.format(now);\n                        \/\/\u7b2c\u4e00\u79cd\n\/\/                        String formattedDate = DateUtil.formatDate(now);\n                        \/\/\u7b2c\u4e8c\u79cd\n\/\/                        String formattedDate = DateSyncUtil.formatDate(now);\n                        \/\/\u7b2c\u4e09\u79cd\n\/\/                        String formattedDate = ThreadLocalDateUtil.formatDate(now);\n                        System.out.println("\u7ebf\u7a0b " + Thread.currentThread().getName() + " \u65f6\u95f4\u4e3a: " + formattedDate + " \u5947\u6570i:" + finalI);\n                    }\n\n                } catch (Exception e) {\n                    System.err.println("\u7ebf\u7a0b " + Thread.currentThread().getName() + " \u51fa\u73b0\u4e86\u5f02\u5e38: " + e.getMessage());\n                }\n            });\n        }\n\n        executor.shutdown();\n        try {\n            executor.awaitTermination(30, TimeUnit.SECONDS);\n        } catch (InterruptedException e) {\n            e.printStackTrace();\n        }\n        \/\/ \u8ba1\u7b97\u603b\u8017\u65f6\n        LocalDateTime endDateTime = LocalDateTime.now();\n        Duration duration = Duration.between(startDateTime, endDateTime);\n        System.out.println("\u6240\u6709\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u603b\u8017\u65f6: " + duration.toMillis() + " \u6beb\u79d2");\n    }\n}<\/code><\/pre>\n
\u5177\u4f53demo\u4ee3\u7801\u5982\u4e0a\u6240\u793a\uff0c\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff0c\u7406\u8bba\u4e0a\u6765\u8bf4<\/strong>\u5e94\u8be5\u662f2024\u5e741\u670823\u65e5<\/strong>\u548c2024\u5e741\u670822\u65e5<\/strong>\u6253\u5370\u65e5\u5fd7\u7684\u6b21\u6570\u54045<\/strong>\u6b21\u3002\u5b9e\u9645\u7ed3\u679c\u53d1\u73b0\u5728\u5076\u6570\u7684\u573a\u666f\u4e0b<\/strong>\u4ecd\u7136\u4f1a\u51fa\u73b0\u6253\u5370\u683c\u5f0f\u53162024\u5e741\u670822\u65e5<\/strong>\u7684\u573a\u666f\u3002\u660e\u663e<\/strong>\u51fa\u73b0\u4e86\u6570\u636e\u9519\u4e71\u8d4b\u503c\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u5230\u8fd9\u91cc\u5927\u6982\u53ef\u4ee5\u57fa\u672c\u786e\u5b9a<\/strong>\u5c31\u662fSimpleDateFormat\u7c7b\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u7ebf\u7a0b\u4e0d\u5b89\u5168\u5bfc\u81f4\u7684<\/strong>\u3002<\/p>\n
\"\"<\/p>\n
3.2 SimpleDateFormat\u4e3a\u4ec0\u4e48\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff1f<\/h4>\n
\u67e5\u8be2\u76f8\u5173\u8d44\u6599\u53d1\u73b0\uff0c\u4eceSimpleDateFormat\u7c7b\u63d0\u4f9b\u7684\u63a5\u53e3\u6765\u770b\uff0c\u5b9e\u5728\u8ba9\u4eba\u770b\u4e0d\u51fa\u5b83\u4e0e\u7ebf\u7a0b\u5b89\u5168\u6709\u4ec0\u4e48\u5173\u7cfb\uff0c\u8fdb\u5165SimpleDateFormat\u6e90\u7801\u53d1\u73b0\u7c7b\u4e0a\u9762\u786e\u5b9e\u5b58\u5728\u6ce8\u91ca\u63d0\u9192\uff1a\u610f\u601d\u5c31\u662f\uff0c SimpleDateFormat\u4e2d\u7684\u65e5\u671f\u683c\u5f0f\u4e0d\u662f\u540c\u6b65\u7684\u3002\u63a8\u8350\uff08\u5efa\u8bae\uff09\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u521b\u5efa\u72ec\u7acb\u7684\u683c\u5f0f\u5b9e\u4f8b\u3002\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u4e00\u4e2a\u683c\u5f0f\uff0c\u5219\u5b83\u5fc5\u987b\u4fdd\u6301\u5916\u90e8\u540c\u6b65\u3002<\/p>\n
\"\"<\/p>\n
\u7ee7\u7eed\u5206\u6790\u6e90\u7801\u53d1\u73b0\uff0cSimpleDateFormat\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u771f\u6b63\u539f\u56e0\u662f\u7ee7\u627f\u4e86DateFormat,<\/strong>\u5728DateFormat<\/strong>\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2aprotected<\/strong>\u5c5e\u6027\u7684 Calendar<\/strong>\u7c7b\u7684\u5bf9\u8c61\uff1acalendar\u3002\u7531\u4e8eCalendar\u7c7b\u7684\u6982\u5ff5\u590d\u6742\uff0c\u7275\u626f\u5230\u65f6\u533a\u4e0e\u672c\u5730\u5316<\/strong>\u7b49\u7b49\uff0cjdk\u7684\u5b9e\u73b0\u4e2d\u4f7f\u7528\u4e86\u6210\u5458\u53d8\u91cf\u6765\u4f20\u9012\u53c2\u6570\uff0c\u8fd9\u5c31\u9020\u6210\u5728\u591a\u7ebf\u7a0b\u7684\u65f6\u5019\u4f1a\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n
\"\"<\/p>\n
\u6ce8\u610f\u5230\u5728format\u65b9\u6cd5\u4e2d\u6709\u4e00\u6bb5\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
 public StringBuffer format(Date date, StringBuffer toAppendTo,\n                               FieldPosition pos)\n    {\n        pos.beginIndex = pos.endIndex = 0;\n        return format(date, toAppendTo, pos.getFieldDelegate());\n    }\n\n    \/\/ Called from Format after creating a FieldDelegate\n    private StringBuffer format(Date date, StringBuffer toAppendTo,\n                                FieldDelegate delegate) {\n        \/\/ Convert input date to time field list\n        calendar.setTime(date);\n\n        boolean useDateFormatSymbols = useDateFormatSymbols();\n\n        for (int i = 0; i < compiledPattern.length; ) {\n            int tag = compiledPattern[i] >>> 8;\n            int count = compiledPattern[i++] & 0xff;\n            if (count == 255) {\n                count = compiledPattern[i++] << 16;\n                count |= compiledPattern[i++];\n            }\n\n            switch (tag) {\n            case TAG_QUOTE_ASCII_CHAR:\n                toAppendTo.append((char)count);\n                break;\n\n            case TAG_QUOTE_CHARS:\n                toAppendTo.append(compiledPattern, i, count);\n                i += count;\n                break;\n\n            default:\n                subFormat(tag, count, delegate, toAppendTo, useDateFormatSymbols);\n                break;\n            }\n        }\n        return toAppendTo;\n    }<\/code><\/pre>\n
calendar.setTime(date)<\/strong>\u8fd9\u6761\u8bed\u53e5\u6539\u53d8\u4e86calendar\uff0c\u7a0d\u540e\uff0ccalendar\u8fd8\u4f1a\u7528\u5230\uff08\u5728subFormat\u65b9\u6cd5\u91cc\uff09\uff0c\u800c\u8fd9\u5c31\u662f\u5f15\u53d1\u95ee\u9898\u7684\u6839\u6e90\u3002<\/p>\n
\u60f3\u8c61\u4e00\u4e0b\uff0c\u5728\u4e00\u4e2a\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u6709\u4e24\u4e2a\u7ebf\u7a0b\u6301\u6709\u4e86\u540c\u4e00\u4e2aSimpleDateFormat\u7684\u5b9e\u4f8b\uff0c\u5206\u522b\u8c03\u7528format\u65b9\u6cd5\uff1a \u7ebf\u7a0b1\u8c03\u7528format\u65b9\u6cd5\uff0c\u6539\u53d8\u4e86calendar\u8fd9\u4e2a\u5b57\u6bb5\u3002 \u4e2d\u65ad\u6765\u4e86\u3002 \u7ebf\u7a0b2\u5f00\u59cb\u6267\u884c\uff0c\u5b83\u4e5f\u6539\u53d8\u4e86calendar\u3002 \u53c8\u4e2d\u65ad\u4e86\u3002 \u7ebf\u7a0b1\u56de\u6765\u4e86\uff0c\u6b64\u65f6\uff0ccalendar\u5df2\u7136\u4e0d\u662f\u5b83\u6240\u8bbe\u7684\u503c\uff0c\u800c\u662f\u8d70\u4e0a\u4e86\u7ebf\u7a0b2\u8bbe\u8ba1\u7684\u9053\u8def\u3002<\/p>\n
\u5982\u679c\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4e89\u62a2calendar\u5bf9\u8c61\uff0c\u5219\u4f1a\u51fa\u73b0\u5404\u79cd\u95ee\u9898\uff0c\u65f6\u95f4\u4e0d\u5bf9<\/strong>\uff0c\u7ebf\u7a0b\u6302\u6b7b<\/strong>\u7b49\u7b49\u3002 \u5206\u6790\u4e00\u4e0bformat\u7684\u5b9e\u73b0\uff0c\u6211\u4eec\u4e0d\u96be\u53d1\u73b0\uff0c\u7528\u5230\u6210\u5458\u53d8\u91cfcalendar\uff0c\u552f\u4e00\u7684\u597d\u5904\uff0c\u5c31\u662f\u5728\u8c03\u7528subFormat\u65f6\uff0c\u5c11\u4e86\u4e00\u4e2a\u53c2\u6570\uff0c\u5374\u5e26\u6765\u4e86\u8fd9\u8bb8\u591a\u7684\u95ee\u9898\u3002<\/p>\n
\u5176\u5b9e\uff0c\u53ea\u8981\u5728\u8fd9\u91cc\u7528\u4e00\u4e2a\u5c40\u90e8\u53d8\u91cf\uff0c\u4e00\u8def\u4f20\u9012\u4e0b\u53bb\uff0c\u6240\u6709\u95ee\u9898\u90fd\u5c06\u8fce\u5203\u800c\u89e3\u3002 \u8fd9\u4e2a\u95ee\u9898\u80cc\u540e\u9690\u85cf\u7740\u4e00\u4e2a\u66f4\u4e3a\u91cd\u8981\u7684\u95ee\u9898\u2013\u65e0\u72b6\u6001<\/strong>\uff1a\u65e0\u72b6\u6001\u65b9\u6cd5\u7684\u597d\u5904\u4e4b\u4e00\uff0c\u5c31\u662f\u5b83\u5728\u5404\u79cd\u73af\u5883\u4e0b\uff0c\u90fd\u53ef\u4ee5\u5b89\u5168\u7684\u8c03\u7528\u3002\u8861\u91cf\u4e00\u4e2a\u65b9\u6cd5\u662f\u5426\u662f\u6709\u72b6\u6001\u7684\uff0c\u5c31\u770b\u5b83\u662f\u5426\u6539\u52a8\u4e86\u5176\u5b83\u7684\u4e1c\u897f\uff0c\u6bd4\u5982\u5168\u5c40\u53d8\u91cf\uff0c\u6bd4\u5982\u5b9e\u4f8b\u7684\u5b57\u6bb5\u3002format\u65b9\u6cd5\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u6539\u52a8\u4e86SimpleDateFormat\u7684calendar\u5b57\u6bb5\uff0c\u6240\u4ee5\uff0c\u5b83\u662f\u6709\u72b6\u6001\u7684\u3002<\/p>\n
4. \u5982\u4f55\u89e3\u51b3\uff1f<\/h3>\n
4.1 \u6bcf\u6b21\u5728\u9700\u8981\u65f6\u65b0\u521b\u5efa\u5b9e\u4f8b<\/h4>\n
\u5728\u9700\u8981\u8fdb\u884c\u683c\u5f0f\u5316\u65e5\u671f\u7684\u5730\u65b9\u65b0\u5efa\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u4e0d\u7ba1\u4ec0\u4e48\u65f6\u5019\uff0c\u5c06\u6709\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u7684\u5bf9\u8c61\u7531\u5171\u4eab\u53d8\u4e3a\u5c40\u90e8\u79c1\u6709\u90fd\u80fd\u907f\u514d\u591a\u7ebf\u7a0b\u95ee\u9898\uff0c\u4e0d\u8fc7\u4e5f\u52a0\u91cd\u4e86\u521b\u5efa\u5bf9\u8c61\u7684\u8d1f\u62c5\u3002\u5728\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u8fd9\u6837\u5176\u5b9e\u5bf9\u6027\u80fd\u5f71\u54cd\u6bd4\u4e0d\u662f\u5f88\u660e\u663e\u7684\u3002\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\u3002<\/p>\n
import java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n * @author \n * @date 2024\/1\/23 20:04\n *\/\n\n\npublic class DateUtil {\n\n    public static String formatDate(Date date) throws ParseException {\n        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");\n        return sdf.format(date);\n    }\n\n    public static Date parse(String strDate) throws ParseException {\n        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");\n        return sdf.parse(strDate);\n    }\n}\u200b<\/code><\/pre>\n
4.2 \u540c\u6b65SimpleDateFormat\u5bf9\u8c61<\/h4>\n
import java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n * @author \n * @date 2024\/1\/23 20:04\n *\/\n\n\npublic class DateSyncUtil {\n\n    private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");\n\n    public static String formatDate(Date date) throws ParseException {\n        synchronized (sdf) {\n            return sdf.format(date);\n        }\n    }\n\n    public static Date parse(String strDate) throws ParseException {\n        synchronized (sdf) {\n            return sdf.parse(strDate);\n        }\n    }\n}<\/code><\/pre>\n
\u8bf4\u660e\uff1a<\/strong>\u5f53\u7ebf\u7a0b\u8f83\u591a\u65f6\uff0c\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528\u8be5\u65b9\u6cd5\u65f6\uff0c\u5176\u4ed6\u60f3\u8981\u8c03\u7528\u6b64\u65b9\u6cd5\u7684\u7ebf\u7a0b\u5c31\u8981block\uff0c\u591a\u7ebf\u7a0b\u5e76\u53d1\u91cf\u5927\u7684\u65f6\u5019\u4f1a\u5bf9\u6027\u80fd\u6709\u4e00\u5b9a\u7684\u5f71\u54cd\u3002<\/h4>\n
4.3 ThreadLocal<\/h4>\n
import java.text.DateFormat;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\npublic class ConcurrentDateUtil {\n\n    private static ThreadLocal<DateFormat> threadLocal = new ThreadLocal<DateFormat>() {\n        @Override\n        protected DateFormat initialValue() {\n            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");\n        }\n    };\n\n    public static Date parse(String dateStr) throws ParseException {\n        return threadLocal.get().parse(dateStr);\n    }\n\n    public static String format(Date date) {\n        return threadLocal.get().format(date);\n    }\n}<\/code><\/pre>\n
\u53e6\u4e00\u79cd\u5199\u6cd5<\/p>\n
import java.text.DateFormat;\nimport java.text.ParseException;\nimport java.text.SimpleDateFormat;\nimport java.util.Date;\n\n\/**\n * @author \n * @date 2024\/1\/23 15:44\n * @description \u7ebf\u7a0b\u5b89\u5168\u7684\u65e5\u671f\u5904\u7406\u7c7b\n *\/\n\n\npublic class ThreadLocalDateUtil {\n    \/**\n     * \u65e5\u671f\u683c\u5f0f\n     *\/\n    private static final String date_format = "yyyy-MM-dd HH:mm:ss";\n    \/**\n     * \u7ebf\u7a0b\u5b89\u5168\u5904\u7406\n     *\/\n    private static ThreadLocal<DateFormat> threadLocal = new ThreadLocal<>();\n\n    \/**\n     * \u7ebf\u7a0b\u5b89\u5168\u5904\u7406\n     *\/\n    public static DateFormat getDateFormat() {\n        DateFormat df = threadLocal.get();\n        if (df == null) {\n            df = new SimpleDateFormat(date_format);\n            threadLocal.set(df);\n        }\n        return df;\n    }\n\n    \/**\n     * \u7ebf\u7a0b\u5b89\u5168\u5904\u7406\u65e5\u671f\u683c\u5f0f\u5316\n     *\/\n    public static String formatDate(Date date) {\n        return getDateFormat().format(date);\n    }\n\n    \/**\n     * \u7ebf\u7a0b\u5b89\u5168\u5904\u7406\u65e5\u671f\u89e3\u6790\n     *\/\n    public static Date parse(String strDate) throws ParseException {\n        return getDateFormat().parse(strDate);\n    }\n}<\/code><\/pre>\n
\u8bf4\u660e\uff1a<\/strong>\u4f7f\u7528ThreadLocal, \u4e5f\u662f\u5c06\u5171\u4eab\u53d8\u91cf\u53d8\u4e3a\u72ec\u4eab\uff0c\u7ebf\u7a0b\u72ec\u4eab\u80af\u5b9a\u80fd\u6bd4\u65b9\u6cd5\u72ec\u4eab\u5728\u5e76\u53d1\u73af\u5883\u4e2d\u80fd\u51cf\u5c11\u4e0d\u5c11\u521b\u5efa\u5bf9\u8c61\u7684\u5f00\u9500\u3002\u5982\u679c\u5bf9\u6027\u80fd\u8981\u6c42\u6bd4\u8f83\u9ad8\u7684\u60c5\u51b5\u4e0b\uff0c\u4e00\u822c\u63a8\u8350\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5<\/p>\n
4.4 \u629b\u5f03JDK\uff0c\u4f7f\u7528\u5176\u4ed6\u7c7b\u5e93\u4e2d\u7684\u65f6\u95f4\u683c\u5f0f\u5316\u7c7b<\/h4>\n
\u2022\u4f7f\u7528Apache commons<\/strong> \u91cc\u7684FastDateFormat<\/strong>\uff0c\u5ba3\u79f0\u662f\u65e2\u5feb\u53c8\u7ebf\u7a0b\u5b89\u5168\u7684SimpleDateFormat, \u53ef\u60dc\u5b83\u53ea\u80fd<\/strong>\u5bf9\u65e5\u671f\u8fdb\u884cformat, \u4e0d\u80fd<\/strong>\u5bf9\u65e5\u671f\u4e32\u8fdb\u884c\u89e3\u6790\u3002<\/p>\n
\u2022\u4f7f\u7528Joda-Time<\/strong>\u7c7b\u5e93\u6765\u5904\u7406\u65f6\u95f4\u76f8\u5173\u95ee\u9898\u3002<\/p>\n
5. \u6027\u80fd\u6bd4\u8f83<\/h3>\n
\u901a\u8fc7\u8ffd\u52a0\u65f6\u95f4\u76d1\u63a7\uff0c\u5c06\u539f\u6709\u6570\u636e\u8303\u56f4\u6269\u5145\u5230[0,999]<\/strong>\uff0c\u7ebf\u7a0b\u6c60\u4fdd\u755910<\/strong>\u4e2a\u7ebf\u7a0b\u4e0d\u53d8\uff0c\u89c2\u5bdf\u4e09\u79cd\u60c5\u51b5\u4e0b\u6027\u80fd\u60c5\u51b5\u3002<\/p>\n
\u2022\u7b2c\u4e00\u79cd\uff1a\u8017\u65f640ms<\/p>\n
\"\"<\/p>\n
\u2022\u7b2c\u4e8c\u79cd\uff1a\u8017\u65f633ms<\/p>\n
\"\"<\/p>\n
\u2022\u7b2c\u4e09\u79cd\uff1a\u8017\u65f630ms<\/p>\n
\"\"<\/p>\n
\u901a\u8fc7\u6027\u80fd\u538b\u6d4b\u53d1\u73b04.3<\/strong>\u4e2d\u7684ThreadLocal\u6027\u80fd\u6700\u4f18\uff0c\u8017\u65f630ms\uff0c4.1<\/strong>\u6bcf\u6b21\u65b0\u521b\u5efa\u5b9e\u4f8b\u6027\u80fd\u6700\u5dee\uff0c\u9700\u8981\u8017\u65f640ms\uff0c\u5f53\u7136\u4e86\u5728\u6781\u81f4\u7684\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u63d0\u5347\u6548\u679c\u5e94\u8be5\u4f1a\u66f4\u52a0\u660e\u663e\u3002\u6027\u80fd\u95ee\u9898\u4e0d\u662f\u672c\u6587\u63a2\u8ba8\u7684\u91cd\u70b9\uff0c\u5728\u6b64\u4e0d\u591a\u505a\u8d58\u8ff0\u3002<\/p>\n
6. \u603b\u7ed3<\/h3>\n
\u4ee5\u4e0a\u5c31\u662f\u9488\u5bf9\u672c\u6b21\u95ee\u9898\u6392\u67e5\u7684\u4e3b\u8981\u601d\u8def\u53ca\u6d41\u7a0b<\/strong>\uff0c\u521a\u5f00\u59cb\u7684\u6392\u67e5\u601d\u8def\u4e5f\u4e00\u76f4\u5c40\u9650\u4e8e<\/strong>\u89c4\u5219\u5f15\u64ce\u7684\u7ebf\u7a0b\u4e0d\u5b89\u5168\u6216\u8005\u662f\u4f20\u5165\u7684env\uff08\u7531\u4e8e\u4f7f\u7528\u7684\u662fHashMap\uff09\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u8fd8\u662f\u53d7\u5230\u7ec4\u5185\u5927\u4f6c<\/strong>\u7684\u542f\u53d1\u548c\u5e2e\u52a9\u624d\u8fdb\u4e00\u6b65\u53bb\u5206\u6790SimpleDateFormat<\/strong>\u7c7b\u53ef\u80fd\u4f1a\u5b58\u5728\u7ebf\u7a0b\u4e0d\u5b89\u5168\u3002\u672c\u6b21\u95ee\u9898\u6392\u67e5\u786e\u5b9e\u63d0\u4f9b\u4e00\u4e2a\u7ecf\u9a8c<\/strong>\uff0c\u6253\u7834\u5e38\u89c4\u601d\u8def<\/strong>\uff0c\u6bd4\u5982SimpleDateFormat<\/strong>\u7c7b\u770b\u8d77\u6765\u53ea\u662f<\/strong>\u5bf9\u65e5\u671f\u8fdb\u884c\u683c\u5f0f\u5316\uff0c\u5f88\u96be<\/strong>\u548c\u5728\u5e76\u53d1\u573a\u666f\u4e0b\u7ebf\u7a0b\u4e0d\u5b89\u5168\u4f1a\u5bfc\u81f4\u6570\u636e\u9519\u4e71\u5173\u8054\u8d77\u6765<\/strong>\u3002<\/p>\n
\u4f5c\u8005\uff1a\u4eac\u4e1c\u79d1\u6280 \u5b8b\u6167\u8d85<\/p>\n
\u6765\u6e90\uff1a\u4eac\u4e1c\u4e91\u5f00\u53d1\u8005\u793e\u533a \u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u6e90<\/p>\n
https:\/\/segmentfault.com\/a\/1190000044636035<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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