{"id":300165,"date":"2024-05-20T17:35:54","date_gmt":"2024-05-20T09:35:54","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/300165.html"},"modified":"2024-05-20T17:36:18","modified_gmt":"2024-05-20T09:36:18","slug":"java-%e9%a1%b9%e7%9b%ae%e7%a8%8b%e5%ba%8f%e4%b8%ad%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96%e7%b3%bb%e7%bb%9f%e6%97%b6%e9%97%b4-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/300165.html","title":{"rendered":"Java \u9879\u76ee\u7a0b\u5e8f\u4e2d\u5982\u4f55\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/26212342\/5ef56c3a-6989-48eb-92a4-e9b0a7c382b2.webp\" alt=\"Java \u9879\u76ee\u7a0b\u5e8f\u4e2d\u5982\u4f55\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\" \/><\/p>\n<p><p>\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u662fJava\u7f16\u7a0b\u4e2d\u7684\u4e00\u9879\u57fa\u7840\u4e14\u91cd\u8981\u7684\u529f\u80fd\uff0c\u5b83\u53ef\u4ee5\u5e94\u7528\u4e8e\u65e5\u5fd7\u8bb0\u5f55\u3001\u6027\u80fd\u76d1\u63a7\u3001\u7528\u6237\u884c\u4e3a\u5206\u6790\u7b49\u591a\u4e2a\u65b9\u9762\u3002\u5728Java\u9879\u76ee\u7a0b\u5e8f\u4e2d\uff0c<strong>\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u7684\u4e3b\u8981\u65b9\u6cd5\u6709\uff1aSystem\u7c7b\u7684<code>currentTimeMillis()<\/code>\u65b9\u6cd5\u3001Date\u7c7b\u3001Calendar\u7c7b\u4ee5\u53caJava 8\u4e2d\u5f15\u5165\u7684\u65b0\u7684\u65f6\u95f4API\uff1aLocalDateTime\u7c7b\u3001Instant\u7c7b<\/strong>\u7b49\u3002\u8fd9\u4e9b\u65b9\u6cd5\u80fd\u591f\u6ee1\u8db3\u7edd\u5927\u591a\u6570\u5bf9\u7cfb\u7edf\u65f6\u95f4\u83b7\u53d6\u7684\u9700\u6c42\u3002\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0c<strong><code>System.currentTimeMillis()<\/code><\/strong> \u63d0\u4f9b\u4e86\u4e00\u79cd\u5feb\u901f\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\u7684\u6beb\u79d2\u6570\uff0c\u8fd9\u662f\u65f6\u95f4\u64cd\u4f5c\u4e2d\u6700\u4e3a\u57fa\u7840\u4e14\u5e7f\u6cdb\u4f7f\u7528\u7684\u4e00\u79cd\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001SYSTEM.CURRENTTIMEMILLIS() \u65b9\u6cd5<\/h3>\n<\/p>\n<p><p><code>System.currentTimeMillis()<\/code> \u65b9\u6cd5\u975e\u5e38\u76f4\u63a5\uff0c\u5b83\u83b7\u53d6\u7684\u662f\u5f53\u524d\u65f6\u95f4\u4e0e1970\u5e741\u67081\u65e50\u70b90\u52060\u79d2\uff08UTC\u65f6\u533a\uff09\u4e4b\u95f4\u7684\u5dee\u503c\uff0c\u5355\u4f4d\u662f\u6beb\u79d2\u3002\u8fd9\u4e2a\u65b9\u6cd5\u662f\u56e0\u4e3a\u5176\u9ad8\u6548\u6027\u800c\u88ab\u5e7f\u6cdb\u4f7f\u7528\u4e8e\u6027\u80fd\u654f\u611f\u7684\u5e94\u7528\u4e2d\u3002\u5bf9\u4e8e\u9700\u8981\u8fdb\u884c\u65f6\u95f4\u6233\u8bb0\u5f55\u7684\u60c5\u51b5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u5f88\u597d\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528\u793a\u4f8b<\/h4>\n<\/p>\n<p><pre><code class=\"language-java\">long currentTimeMillis = System.currentTimeMillis();<\/p>\n<p>System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u7684\u6beb\u79d2\u6570: &quot; + currentTimeMillis);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u5e94\u7528\u573a\u666f<\/h4>\n<\/p>\n<p><p>\u6b64\u65b9\u6cd5\u4e3b\u8981\u88ab\u7528\u5728\u6027\u80fd\u6d4b\u91cf\u4ee5\u53ca\u65e5\u5fd7\u8bb0\u5f55\u4e2d\uff0c\u56e0\u4e3a\u5b83\u7684\u6267\u884c\u901f\u5ea6\u975e\u5e38\u5feb\uff0c\u51e0\u4e4e\u4e0d\u4f1a\u5bf9\u7a0b\u5e8f\u6027\u80fd\u4ea7\u751f\u5f71\u54cd\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001DATE\u7c7b<\/h3>\n<\/p>\n<p><p>Java\u7684<code>Date<\/code>\u7c7b\u4e5f\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\u3002\u5c3d\u7ba1\u5b83\u5728Java 8\u4e4b\u540e\u7684\u7248\u672c\u4e2d\u5df2\u7ecf\u4e0d\u518d\u662f\u6700\u63a8\u8350\u7684\u65f6\u95f4\u83b7\u53d6\u65b9\u5f0f\uff0c\u4f46\u5728\u4e00\u4e9b\u9057\u7559\u7cfb\u7edf\u4e2d\uff0c\u4f60\u53ef\u80fd\u8fd8\u4f1a\u7ecf\u5e38\u770b\u5230\u5b83\u7684\u8eab\u5f71\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528\u793a\u4f8b<\/h4>\n<\/p>\n<p><pre><code class=\"language-java\">Date now = new Date();<\/p>\n<p>System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u662f\uff1a&quot; + now);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u5c55\u5f00\u63cf\u8ff0<\/h4>\n<\/p>\n<p><p><code>Date<\/code>\u7c7b\u4e0d\u4ec5\u53ef\u4ee5\u8868\u793a\u65f6\u95f4\uff0c\u8fd8\u53ef\u4ee5\u7528\u4e8e\u8868\u793a\u65e5\u671f\u3002\u5bf9\u4e8e\u4e00\u4e9b\u7b80\u5355\u7684\u65e5\u671f\u65f6\u95f4\u64cd\u4f5c\uff0c<code>Date<\/code>\u7c7b\u7684\u4f7f\u7528\u662f\u6bd4\u8f83\u76f4\u63a5\u7684\u3002\u4f46\u662f\uff0c\u5b83\u7684\u5f88\u591a\u65b9\u6cd5\u5728Java 8\u4e2d\u5df2\u7ecf\u88ab\u6807\u8bb0\u4e3a\u8fc7\u65f6\uff08deprecated\uff09\uff0c\u6240\u4ee5\u5728\u65b0\u7684\u9879\u76ee\u4e2d\u63a8\u8350\u4f7f\u7528Java 8\u7684\u65f6\u95f4API\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001CALENDAR\u7c7b<\/h3>\n<\/p>\n<p><p><code>Calendar<\/code>\u7c7b\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u4e9b\u65b9\u6cd5\u6765\u64cd\u4f5c\u65e5\u671f\u548c\u65f6\u95f4\u3002\u4e0e<code>Date<\/code>\u7c7b\u76f8\u6bd4\uff0c<code>Calendar<\/code>\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u529f\u80fd\uff0c\u5982\u83b7\u53d6\u7279\u5b9a\u65f6\u95f4\u5b57\u6bb5\uff08\u5e74\u3001\u6708\u3001\u65e5\u3001\u65f6\u3001\u5206\u3001\u79d2\uff09\u548c\u8fdb\u884c\u65e5\u671f\u65f6\u95f4\u7684\u52a0\u51cf\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528\u793a\u4f8b<\/h4>\n<\/p>\n<p><pre><code class=\"language-java\">Calendar calendar = Calendar.getInstance();<\/p>\n<p>System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u662f\uff1a&quot; + calendar.getTime());<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>\u5e94\u7528\u573a\u666f<\/h4>\n<\/p>\n<p><p><code>Calendar<\/code>\u7c7b\u975e\u5e38\u9002\u5408\u4e8e\u9700\u8981\u8fdb\u884c\u8be6\u7ec6\u7684\u65e5\u671f\u548c\u65f6\u95f4\u5b57\u6bb5\u64cd\u4f5c\u7684\u573a\u666f\uff0c\u6bd4\u5982\u8ba1\u7b97\u4e24\u4e2a\u65e5\u671f\u4e4b\u95f4\u7684\u5929\u6570\u3001\u8c03\u6574\u65f6\u95f4\u5b57\u6bb5\u503c\u7b49\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001JDK 8 \u65f6\u95f4API<\/h3>\n<\/p>\n<p><p>Java 8\u5f15\u5165\u4e86\u5168\u65b0\u7684\u65f6\u95f4\u548c\u65e5\u671fAPI\uff0c\u5176\u8bbe\u8ba1\u76ee\u7684\u662f\u4e3a\u4e86\u514b\u670d\u65e7\u6709<code>Date<\/code>\u548c<code>Calendar<\/code>\u7c7b\u7684\u7f3a\u9677\u3002<strong>\u65b0\u7684API\u5305\u62ec<code>LocalDateTime<\/code>\u3001<code>Instant<\/code>\u7b49\u7c7b<\/strong>\uff0c\u5b83\u4eec\u63d0\u4f9b\u4e86\u66f4\u4e3a\u5168\u9762\u548c\u7cbe\u786e\u7684\u65f6\u95f4\u65e5\u671f\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<p><h4>LocalDateTime<\/h4>\n<\/p>\n<p><p><code>LocalDateTime<\/code>\u7c7b\u662f\u4e0d\u5e26\u65f6\u533a\u7684\u65e5\u671f\u65f6\u95f4\u7c7b\uff0c\u5b83\u4ee3\u8868\u4e86\u65e5\u671f\u548c\u65f6\u95f4\uff0c\u4f46\u4e0d\u5305\u542b\u65f6\u533a\u4fe1\u606f\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">LocalDateTime now = LocalDateTime.now();<\/p>\n<p>System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u662f\uff1a&quot; + now);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h4>Instant<\/h4>\n<\/p>\n<p><p><code>Instant<\/code>\u7c7b\u4ee3\u8868\u7684\u662f\u65f6\u95f4\u6233\uff0c\u7c7b\u4f3c\u4e8e<code>System.currentTimeMillis()<\/code>\uff0c\u4f46\u5b83\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u65b9\u6cd5\u548c\u7cbe\u786e\u5ea6\u3002<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">Instant instant = Instant.now();<\/p>\n<p>System.out.println(&quot;\u5f53\u524d\u65f6\u95f4\u6233\u662f\uff1a&quot; + instant);<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><h3>\u4e94\u3001\u6bd4\u8f83\u4e0e\u9009\u62e9<\/h3>\n<\/p>\n<p><p>\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u9009\u62e9\u54ea\u79cd\u65b9\u5f0f\u6765\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u7684\u5e94\u7528\u9700\u8981\u4e0e\u5176\u4ed6\u57fa\u4e8eUnix\u65f6\u95f4\u6233\u7684\u7cfb\u7edf\u4ea4\u4e92\uff0c<code>Instant<\/code>\u6216<code>System.currentTimeMillis()<\/code>\u53ef\u80fd\u662f\u66f4\u597d\u7684\u9009\u62e9\u3002\u5982\u679c\u9700\u8981\u5bf9\u65e5\u671f\u548c\u65f6\u95f4\u8fdb\u884c\u590d\u6742\u7684\u64cd\u4f5c\uff0c\u800c\u4e14\u662f\u5728Java 8\u53ca\u5176\u4e4b\u540e\u7684\u7248\u672c\u4e0a\u8fd0\u884c\uff0c\u90a3\u4e48\u4f7f\u7528\u57fa\u4e8eJava 8\u7684\u65b0\u65f6\u95f4API\u4f1a\u662f\u66f4\u4f18\u7684\u9009\u62e9\u3002<\/p>\n<\/p>\n<p><p>\u901a\u8fc7\u7406\u89e3\u548c\u6bd4\u8f83\u4e0a\u8ff0\u5404\u65b9\u6cd5\u7684\u7279\u70b9\u548c\u5e94\u7528\u573a\u666f\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u5728Java\u9879\u76ee\u4e2d\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u7cfb\u7edf\u65f6\u95f4\u83b7\u53d6\u65b9\u5f0f\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u4f7f\u7528Java\u4ee3\u7801\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\uff1f<\/strong><br \/>\n\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u662fJava\u7a0b\u5e8f\u4e2d\u5e38\u89c1\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528Java\u4e2d\u7684<code>java.util.Date<\/code>\u548c<code>java.util.Calendar<\/code>\u6765\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u3002\u4f8b\u5982\uff0c\u4f7f\u7528<code>Date<\/code>\u7c7b\u53ef\u4ee5\u901a\u8fc7<code>new Date()<\/code>\u521b\u5efa\u4e00\u4e2a\u8868\u793a\u5f53\u524d\u65f6\u95f4\u7684\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528<code>getTime()<\/code>\u65b9\u6cd5\u83b7\u53d6\u65f6\u95f4\u6233\u3002\u4f7f\u7528<code>Calendar<\/code>\u7c7b\u53ef\u4ee5\u4f7f\u7528<code>Calendar.getInstance()<\/code>\u83b7\u53d6\u5f53\u524d\u65e5\u5386\u5b9e\u4f8b\uff0c\u5e76\u4f7f\u7528<code>get(Calendar.xxx)<\/code>\u65b9\u6cd5\u83b7\u53d6\u6240\u9700\u7684\u65f6\u95f4\u4fe1\u606f\u3002<\/p>\n<p><strong>2. \u5982\u4f55\u683c\u5f0f\u5316\u7cfb\u7edf\u65f6\u95f4\u8f93\u51fa\uff1f<\/strong><br \/>\n\u5982\u679c\u4f60\u9700\u8981\u5c06\u7cfb\u7edf\u65f6\u95f4\u6309\u7167\u7279\u5b9a\u7684\u683c\u5f0f\u8f93\u51fa\uff0c\u53ef\u4ee5\u4f7f\u7528<code>SimpleDateFormat<\/code>\u7c7b\u3002\u4f7f\u7528<code>SimpleDateFormat<\/code>\u7684<code>format()<\/code>\u65b9\u6cd5\uff0c\u4f60\u53ef\u4ee5\u4f20\u5165\u4e00\u4e2a<code>Date<\/code>\u5bf9\u8c61\uff0c\u5e76\u6307\u5b9a\u4f60\u60f3\u8981\u7684\u65f6\u95f4\u683c\u5f0f\uff0c\u4f8b\u5982&quot;yyyy-MM-dd HH:mm:ss&quot;\u3002\u8fd9\u6837\uff0c\u4f60\u5c31\u80fd\u591f\u83b7\u5f97\u4e00\u4e2a\u6309\u7167\u4f60\u6307\u5b9a\u683c\u5f0f\u7684\u7cfb\u7edf\u65f6\u95f4\u3002<\/p>\n<p><strong>3. \u5982\u4f55\u5904\u7406\u4e0d\u540c\u65f6\u533a\u7684\u7cfb\u7edf\u65f6\u95f4\uff1f<\/strong><br \/>\n\u5728Java\u4e2d\u5904\u7406\u4e0d\u540c\u65f6\u533a\u7684\u7cfb\u7edf\u65f6\u95f4\uff0c\u53ef\u4ee5\u4f7f\u7528<code>java.time<\/code>\u5305\u4e0b\u7684\u76f8\u5173\u7c7b\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528<code>ZonedDateTime<\/code>\u6765\u8868\u793a\u5e26\u6709\u65f6\u533a\u4fe1\u606f\u7684\u65f6\u95f4\u3002\u5982\u679c\u4f60\u9700\u8981\u5c06\u4e00\u4e2a\u65f6\u533a\u7684\u65f6\u95f4\u8f6c\u6362\u4e3a\u53e6\u4e00\u4e2a\u65f6\u533a\u7684\u65f6\u95f4\uff0c\u53ef\u4ee5\u4f7f\u7528<code>ZonedDateTime<\/code>\u7684<code>withZoneSameInstant()<\/code>\u65b9\u6cd5\u3002\u901a\u8fc7\u6307\u5b9a\u76ee\u6807\u65f6\u533a\uff0c\u4f60\u53ef\u4ee5\u83b7\u53d6\u5728\u76ee\u6807\u65f6\u533a\u4e2d\u5bf9\u5e94\u7684\u65f6\u95f4\u503c\u3002<\/p>\n<p>\u6ce8\u610f\uff1a\u5728\u5904\u7406\u7cfb\u7edf\u65f6\u95f4\u65f6\uff0c\u5efa\u8bae\u4f7f\u7528<code>java.time<\/code>\u5305\u4e0b\u7684\u7c7b\uff0c\u56e0\u4e3aJava 8\u6216\u66f4\u9ad8\u7248\u672c\u4e2d\u5f15\u5165\u7684\u8fd9\u4e9b\u7c7b\u63d0\u4f9b\u4e86\u66f4\u597d\u7684\u529f\u80fd\u548c\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u83b7\u53d6\u7cfb\u7edf\u65f6\u95f4\u662fJava\u7f16\u7a0b\u4e2d\u7684\u4e00\u9879\u57fa\u7840\u4e14\u91cd\u8981\u7684\u529f\u80fd\uff0c\u5b83\u53ef\u4ee5\u5e94\u7528\u4e8e\u65e5\u5fd7\u8bb0\u5f55\u3001\u6027\u80fd\u76d1\u63a7\u3001\u7528\u6237\u884c\u4e3a\u5206\u6790\u7b49\u591a\u4e2a\u65b9\u9762\u3002\u5728 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