{"id":2697,"date":"2023-04-11T11:23:04","date_gmt":"2023-04-11T03:23:04","guid":{"rendered":"https:\/\/hsin-life.com\/?p=2697"},"modified":"2023-04-11T11:23:07","modified_gmt":"2023-04-11T03:23:07","slug":"java-%e4%b8%ad-string%e3%80%81date-%e5%92%8c-timestamp-%e4%b9%8b%e9%96%93%e7%9a%84%e8%bd%89%e6%8f%9b","status":"publish","type":"post","link":"https:\/\/hsin-life.com\/archives\/2697","title":{"rendered":"Java \u4e2d String\u3001Date \u548c Timestamp \u4e4b\u9593\u7684\u8f49\u63db"},"content":{"rendered":"\n

\u5728 Java \u7a0b\u5e8f\u4e2d\uff0c\u6211\u5011\u7d93\u5e38\u9700\u8981\u8655\u7406\u6642\u9593\u548c\u65e5\u671f\u3002<\/p>\n\n\n\n

\u5728\u9019\u500b\u904e\u7a0b\u4e2d\uff0c\u6211\u5011\u9700\u8981\u5c07 String \u8207 Date \u548c Timestamp \u4e4b\u9593\u9032\u884c\u76f8\u4e92\u8f49\u63db\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728 Java \u4e2d\u5be6\u73fe\u9019\u4e9b\u8f49\u63db\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u4ee3\u78bc\u793a\u4f8b\u4ee5\u4fbf\u65bc\u7406\u89e3\u3002<\/p>\n\n\n\n

\u4e00\u3001String \u8207 Date\uff08java.util.Date\uff09\u4e92\u8f49<\/p>\n\n\n\n

1.1 String \u8f49 Date\uff1a \u4f7f\u7528 SimpleDateFormat \u985e\u4f86\u5be6\u73fe String \u8f49 Date\u3002<\/p>\n\n\n\n

\u6ce8\u610f format \u7684\u683c\u5f0f\u8981\u8207\u65e5\u671f String \u7684\u683c\u5f0f\u76f8\u5339\u914d\u3002<\/p>\n\n\n\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n

@org.junit.Test\r\npublic void testStringToDate() throws ParseException {\r\n  String dateStr = \"2010-05-04 12:34:23\";\r\n  SimpleDateFormat sdf = new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\");\r\n  Date date = sdf.parse(dateStr);\r\n  System.out.println(date.toString()); \/\/ Tue May 04 12:34:23 CST 2010\r\n}<\/code><\/pre>\n\n\n\n
1.2 Date \u8f49 String\uff1a \u4f7f\u7528 SimpleDateFormat \u985e\u5c07 Date \u8f49\u63db\u70ba String\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
@org.junit.Test\r\npublic void testDateToString() {\r\n  Date date = new Date();\r\n  DateFormat sdf = new SimpleDateFormat(\"yyyy\/MM\/dd HH:mm:ss\");\r\n  DateFormat sdf2 = new SimpleDateFormat(\"yyyy-MM-dd HH\/mm\/ss\");\r\n  String dateStr = sdf.format(date);\r\n  System.out.println(dateStr); \/\/2017\/01\/15 13:52:05\r\n  dateStr = sdf2.format(date);\r\n  System.out.println(dateStr); \/\/ 2017-01-15 13\/52\/05\r\n}<\/code><\/pre>\n\n\n\n
\u4e8c\u3001String \u8207 Timestamp \u4e92\u8f49<\/p>\n\n\n\n
2.1 String \u8f49 Timestamp\uff1a \u4f7f\u7528 Timestamp \u7684 valueOf() \u65b9\u6cd5\u4f86\u5be6\u73fe String \u8f49 Timestamp\u3002<\/p>\n\n\n\n
\u6ce8\u610f String \u7684\u683c\u5f0f\u5fc5\u9808\u662f yyyy-mm-dd hh:mm:ss[.f…] \u9019\u6a23\u7684\u683c\u5f0f\uff0c\u5426\u5247\u6703\u5831\u932f\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
@org.junit.Test\r\npublic void testStringToTimestamp() {\r\n  String tsStr = \"2011-05-09 11:49:45\";\r\n  Timestamp ts = Timestamp.valueOf(tsStr);\r\n  System.out.println(ts); \/\/ 2011-05-09 11:49:45.0\r\n}<\/code><\/pre>\n\n\n\n
2.2 Timestamp \u8f49 String\uff1a \u4f7f\u7528 SimpleDateFormat \u985e\u5c07 Timestamp \u8f49\u63db\u70ba String\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
@org.junit.Test\npublic void testTimestampToString() {\n  Timestamp ts = new Timestamp(System.currentTimeMillis());\n  DateFormat sdf = new SimpleDateFormat(\"yyyy-MM-dd HH:mm:ss\");\n  String tsStr = sdf.format(ts);\n  System.out.println(tsStr); \/\/ 2017-01-15 21:17:04\n}<\/code><\/pre>\n\n\n\n
\u6216\u8005\u4f7f\u7528 Timestamp \u7684 toString() \u65b9\u6cd5\uff1a<\/p>\n\n\n\n
tsStr = ts.toString();\r\nSystem.out.println(tsStr); \/\/ 2017-01-15 21:17:04.7\r\n}<\/code><\/pre>\n\n\n\n
\u4e09\u3001Date\uff08java.util.Date\uff09\u548c Timestamp \u4e92\u8f49<\/p>\n\n\n\n
3.1 Timestamp \u8f49 Date\uff1a \u7531\u65bc Timestamp \u662f java.util.Date \u7684\u5b50\u985e\uff0c\u53ef\u4ee5\u76f4\u63a5\u5c07 Timestamp \u5c0d\u8c61\u8ce6\u503c\u7d66 Date \u5c0d\u8c61\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
@org.junit.Test\r\npublic void testTimestampToDate() {\r\n  Timestamp ts = new Timestamp(System.currentTimeMillis());\r\n  Date date = ts;\r\n  System.out.println(date); \/\/ 2017-01-15 21:31:47.801\r\n}<\/code><\/pre>\n\n\n\n
\u6b64\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u901a\u904e getTime() \u65b9\u6cd5\u7372\u53d6 Timestamp \u5c0d\u8c61\u7684\u6642\u9593\u6233\uff0c\u4e26\u4f7f\u7528\u5b83\u5275\u5efa\u4e00\u500b\u65b0\u7684 Date \u5c0d\u8c61\uff1a<\/p>\n\n\n\n
date = new Date(ts.getTime());\r\nSystem.out.println(date); \/\/ Sun Jan 15 21:31:47 CST 2017\r\n}<\/code><\/pre>\n\n\n\n
3.2 Date \u8f49 Timestamp\uff1a \u7531\u65bc\u7236\u985e\u4e0d\u80fd\u76f4\u63a5\u5411\u5b50\u985e\u8f49\u5316\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 Date \u7684 getTime() \u65b9\u6cd5\u7372\u53d6\u6642\u9593\u6233\uff0c\u7136\u5f8c\u4f7f\u7528\u6b64\u6642\u9593\u6233\u5275\u5efa\u4e00\u500b\u65b0\u7684 Timestamp \u5c0d\u8c61\u3002<\/p>\n\n\n\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n\n\n\n
@org.junit.Test\r\npublic void testDateToTimestamp() {\r\n  Date date = new Date();\r\n  Timestamp ts = new Timestamp(date.getTime());\r\n  System.out.println(ts); \/\/ 2017-01-15 21:33:32.203\r\n}<\/code><\/pre>\n\n\n\n
\u7d9c\u4e0a\u6240\u8ff0\uff0c\u6211\u5011\u5df2\u7d93\u5b78\u6703\u4e86\u5982\u4f55\u5728 Java \u4e2d\u5be6\u73fe String\u3001Date \u548c Timestamp \u4e4b\u9593\u7684\u8f49\u63db\u3002<\/p>\n\n\n\n
\u5e0c\u671b\u672c\u6587\u5c0d\u60a8\u6709\u6240\u5e6b\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u672c\u6587\u4ecb\u7d39\u4e86\u5982\u4f55\u5728 Java \u4e2d\u5be6\u73fe String\u3001Date \u548c Timestamp \u4e4b\u9593\u7684\u8f49\u63db\uff0c\u63d0\u4f9b\u4e86\u76f8\u61c9\u7684\u4ee3\u78bc\u793a\u4f8b\u4ee5\u4fbf\u65bc\u7406\u89e3\u3002<\/p>\n","protected":false},"author":1,"featured_media":2699,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[145],"tags":[620,87,621,619,618,440],"aioseo_notices":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/hsin-life.com\/wp-content\/uploads\/2023\/04\/pexels-photo-965345.jpeg?fit=1880%2C1227&ssl=1","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2697"}],"collection":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/comments?post=2697"}],"version-history":[{"count":0,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/posts\/2697\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media\/2699"}],"wp:attachment":[{"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/media?parent=2697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/categories?post=2697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hsin-life.com\/wp-json\/wp\/v2\/tags?post=2697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}