{"id":244,"date":"2020-12-02T17:45:23","date_gmt":"2020-12-02T09:45:23","guid":{"rendered":"https:\/\/refusea.com\/?p=244"},"modified":"2020-12-02T17:46:39","modified_gmt":"2020-12-02T09:46:39","slug":"%e8%81%8a%e8%81%8a-java-%e7%ba%bf%e7%a8%8b%e5%ae%89%e5%85%a8","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=244","title":{"rendered":"\u804a\u804a Java \u7ebf\u7a0b\u5b89\u5168"},"content":{"rendered":"<h2>\u8d77\u56e0<\/h2>\n<p>sonar \u662f\u4e00\u4e2a\u4ee3\u7801\u8d28\u91cf\u7ba1\u7406\u5de5\u5177\uff0c\u67d0\u5929\u5b83\u63ed\u9732\u4e86\u4ee3\u7801\u91cc\u8fd9\u6837\u4e00\u4e2a\u7ea7\u522b\u4e3a\u4e25\u91cd\u7684\u8fdd\u89c4<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/static.refusea.com\/2020\/12\/Threadsafe-dataformat.png\" alt=\"\" \/><\/p>\n<h2>SimpleDateFormat \u6e90\u7801\u89e3\u6790<\/h2>\n<p>\u6839\u636e sonar \u7684\u63d0\u793a\uff0c<code>SimpleDateFormat<\/code> \u7684 <code>format<\/code> \u65b9\u6cd5\u53ef\u80fd\u5b58\u5728\u7ebf\u7a0b\u5b89\u5168\u7684\u95ee\u9898\uff0c\u90a3\u4e48\u6765\u770b\u4e0b <code>SimpleDateFormat<\/code> \u7684\u6e90\u7801\uff0c\u770b\u770b\u662f\u5426\u5982\u6b64<\/p>\n<pre><code class=\"language-java\">\/\/ Called from Format after creating a FieldDelegate\nprivate 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 &lt; compiledPattern.length; ) {\n        int tag = compiledPattern[i] &gt;&gt;&gt; 8;\n        int count = compiledPattern[i++] &amp; 0xff;\n        if (count ##  255) {\n            count = compiledPattern[i++] &lt;&lt; 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<p>\u5f53\u770b\u5230\u7b2c 5 \u884c\u4ee3\u7801\u65f6\uff0c\u5c31\u57fa\u672c\u53ef\u4ee5\u8ba4\u5b9a <code>SimpleDateFormat.format()<\/code> \u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\uff1a\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u6bcf\u6b21\u8c03\u7528 <code>format<\/code> \u65b9\u6cd5\u65f6\uff0c<code>calendar<\/code> \u90fd\u4f1a\u5c06\u65f6\u95f4\u8bbe\u7f6e\u4e3a\u4f20\u5165\u7684\u65f6\u95f4\uff0c\u8fd9\u6837\u5982\u679c\u4e0a\u4e00\u4e2a\u7ebf\u7a0b\u7684 <code>format<\/code> \u65b9\u6cd5\u8fd8\u5728\u6267\u884c\u4e2d\uff0c\u80af\u5b9a\u4f1a\u5bfc\u81f4\u8f93\u51fa\u7684\u7ed3\u679c\u4e0d\u6b63\u786e<\/p>\n<h2>\u5982\u4f55\u505a\u5230\u7ebf\u7a0b\u5b89\u5168<\/h2>\n<p>\u90a3\u4e48\u600e\u4e48\u505a\u624d\u80fd\u7ebf\u7a0b\u5b89\u5168\u5462\uff1f<\/p>\n<h3>\u4e0d\u7528\u9759\u6001\u5c5e\u6027<\/h3>\n<p>\u6bcf\u6b21\u9700\u8981\u683c\u5f0f\u5316\u65e5\u671f\u65f6\uff0c<code>new<\/code> \u4e00\u4e2a <code>DateFormat<\/code>\uff0c\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u201c\u4f18\u5316\u201d\u4e00\u4e0b<\/p>\n<pre><code class=\"language-java\">String inputValue = game.getId() + new SimpleDateFormat(&quot;yyyyMMdd&quot;).format(new Date());<\/code><\/pre>\n<p>\u867d\u7136\u7ebf\u7a0b\u5b89\u5168\u4e86\uff0c\u4f46\u662f\u8fd9\u6837\u6027\u80fd\u5c31\u4e0b\u964d\u4e86\uff0c\u5982\u679c\u8fd9\u6bb5\u4ee3\u7801\u9891\u7e41\u7684\u8c03\u7528\uff0c\u4e0d\u4ec5 <code>new<\/code> \u4e00\u4e2a <code>DateFormat<\/code> \u5bf9\u8c61\u7684\u4ee3\u4ef7\u6709\u70b9\u5927\uff0c\u800c\u4e14\u9891\u7e41\u7684 <code>new<\/code> \u4e5f\u4f1a\u5bfc\u81f4 gc \u7684\u538b\u529b\u589e\u5927<\/p>\n<h3>\u540c\u6b65\u6216\u8005\u52a0\u9501<\/h3>\n<p>\u65e2\u7136 <code>format()<\/code> \u65b9\u6cd5\u7ebf\u7a0b\u4e0d\u5b89\u5168\uff0c\u90a3\u5c31\u5728\u8c03\u7528\u65f6\u91c7\u7528\u540c\u6b65\u6216\u52a0\u9501\uff0c\u4f8b\u5982<\/p>\n<pre><code class=\"language-java\">private static SimpleDateFormat df = new SimpleDateFormat( &quot;yyyyMMdd&quot; );\/\/ \u8bbe\u7f6e\u65e5\u671f\u683c\u5f0f\n\nprivate static final Lock LOCK = new ReentrantLock();\n\n@Override\npublic void addGame( Game game ) {\n    ......\n\n    LOCK.lock();\n    try {\n        String inputValue = game.getId() + df.format( new Date() );\n    } finally {\n        LOCK.unlock();\n    }\n\n    ......\n\n}<\/code><\/pre>\n<h3>DateFormat \u6c60<\/h3>\n<p>\u52a0\u9501\u662f\u89e3\u51b3\u4e86\u7ebf\u7a0b\u5b89\u5168\u7684\u95ee\u9898\uff0c\u4e5f\u4e0d\u4f1a\u56e0\u4e3a <code>new<\/code> \u51fa\u592a\u591a\u7684 <code>DateFormat<\/code> \u589e\u52a0 gc \u7684\u8d1f\u62c5\uff0c\u4f46\u662f\u5f88\u663e\u7136\u5e76\u53d1\u6027\u80fd\u5927\u5927\u7684\u964d\u4f4e\u4e86\uff0c\u5982\u679c\u5728\u5e76\u53d1\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u573a\u5408\uff0c\u8fd8\u4e0d\u5982 <code>new<\/code> \u4e00\u4e2a\u7684\u6027\u80fd\u9ad8\u5462\uff0c\u90a3\u6709\u4ec0\u4e48\u529e\u6cd5\u518d\u4f18\u5316\u4e00\u4e0b\u5417<\/p>\n<p>\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a <code>DateFormat<\/code> \u6c60\uff0c\u5b9e\u73b0\u5982\u4e0b\u529f\u80fd<\/p>\n<ul>\n<li>\u8bbe\u5b9a\u6c60\u7684\u5927\u5c0f\uff0c\u5728\u6c60\u5b9e\u4f8b\u5316\u7684\u540c\u65f6\uff0c\u5b9e\u4f8b\u5316\u4e00\u6279 DateFormat<\/li>\n<li>\u6bcf\u4e2a DateFormat \u90fd\u6709\u4e00\u4e2a\u72b6\u6001\uff0c\u8868\u660e\u5f53\u524d\u662f\u7a7a\u95f2\u8fd8\u662f\u5fd9\uff0c\u521d\u59cb\u72b6\u6001\u4e3a\u7a7a\u95f2<\/li>\n<li>\u5f53\u9700\u8981\u683c\u5f0f\u5316\u65e5\u671f\u65f6\uff0c\u4ece\u6c60\u91cc\u53d6\u51fa\u4e00\u4e2a\u7a7a\u95f2\u7684 DateFormat\uff0c\u540c\u65f6\u5c06\u5176\u6807\u8bb0\u4e3a\u5fd9<\/li>\n<li>\u6c60\u91cc\u7684 DateFormat \u7684 format \u65b9\u6cd5\u9700\u8981\u91cd\u5199\uff0c\u5728 format \u5b8c\u6210\u540e\u5c06\u5176\u72b6\u6001\u6807\u8bb0\u4e3a\u7a7a\u95f2<\/li>\n<\/ul>\n<p>\u7528\u6c60\u7684\u4f18\u52bf\u5f88\u660e\u663e\uff1a\u53ea\u8981\u8bbe\u5b9a\u5408\u9002\u7684\u6c60\u5927\u5c0f\uff0c\u5c31\u4e0d\u7528\u62c5\u5fc3\u5e76\u53d1\u6027\u80fd\uff1b\u5e76\u4e14\u4e5f\u4e0d\u5b58\u5728\u589e\u52a0 gc \u8d1f\u62c5\u7684\u95ee\u9898\uff1b\u5f53\u7136\u6c60\u7684\u5b9e\u73b0\u6bd4\u8f83\u590d\u6742\uff0c\u800c\u4e14\u6c60\u5185\u90e8\u4e5f\u8981\u89e3\u51b3\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\uff0c\u53ef\u4ee5\u8003\u8651\u91c7\u7528\u4e00\u4e9b\u5f00\u6e90\u7684\u6c60\u6846\u67b6\u4f8b\u5982 <code>Apache commons pool<\/code> \u6765\u505a<\/p>\n<h3>ThreadLocal&lt;DateFormat&gt;<\/h3>\n<p>\u5728\u5f15\u5165 <code>ThreadLocal<\/code> \u4e4b\u524d\uff0c\u601d\u8003\u4e00\u4e0b\u8fd9\u4e2a\u95ee\u9898\uff1a\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c<code>format<\/code> \u65b9\u6cd5\u8fd8\u5b58\u5728\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u5417\uff1f<\/p>\n<p>\u663e\u7136\u4e0d\u4f1a\uff0c\u5982\u679c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u5219 <code>format<\/code> \u65b9\u6cd5\u5b9e\u9645\u4e0a\u662f\u4e32\u884c\u6267\u884c\u7684\uff0c\u7edd\u65e0\u53ef\u80fd\u5e76\u884c\u6267\u884c\uff1b\u90a3\u4e48\uff0c\u5982\u679c\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u7ed9\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u5206\u914d\u4e00\u4e2a\u56fa\u5b9a\u7684 <code>DateFormat<\/code> \u6765\u6267\u884c <code>format<\/code> \u65b9\u6cd5\uff0c\u663e\u7136\u4e5f\u4e0d\u4f1a\u6709\u7ebf\u7a0b\u5b89\u5168\u7684\u95ee\u9898\u4e86<\/p>\n<p><code>ThreadLocal<\/code> \u5c31\u662f\u7528\u4e8e\u8fd9\u79cd\u601d\u8def\u7684\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848\uff1a\u4e3a\u6bcf\u4e2a\u4f7f\u7528\u8be5\u53d8\u91cf\u7684\u7ebf\u7a0b\u63d0\u4f9b\u72ec\u7acb\u7684\u53d8\u91cf\u526f\u672c\uff0c\u6240\u4ee5\u6bcf\u4e00\u4e2a\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u72ec\u7acb\u5730\u6539\u53d8\u81ea\u5df1\u7684\u526f\u672c\uff0c\u800c\u4e0d\u4f1a\u5f71\u54cd\u5176\u5b83\u7ebf\u7a0b\u6240\u5bf9\u5e94\u7684\u526f\u672c\u3002<\/p>\n<p><code>ThreadLocal<\/code> \u7684\u4f7f\u7528\u5982\u4e0b<\/p>\n<pre><code class=\"language-java\">private static final String   DATE_FORMAT = &quot;yyyy-MM-dd&quot;;\n\nprivate static final ThreadLocal&lt;DateFormat&gt; SDF  = new ThreadLocal&lt;DateFormat&gt;() {\n    protected synchronized DateFormat initialValue() {\n        return new SimpleDateFormat(DATE_FORMAT);\n    }\n};\n\n        ......\n\n    album.setReleaseDate(SDF.get().parse(show.getReleasedate().substring(0, 10)));<\/code><\/pre>\n<h2>\u5982\u4f55\u9009\u62e9<\/h2>\n<p>\u5148\u770b\u6bcf\u6b21\u90fd <code>new<\/code> \u4e00\u4e2a\u65b0\u5bf9\u8c61\u548c <code>ThreaLocal<\/code> \u4e4b\u95f4\u7684\u5dee\u522b\uff0c\u5047\u8bbe\u6709 1 \u4e2a\u7ebf\u7a0b\u8981\u6267\u884c n \u6b21 <code>format<\/code><\/p>\n<ul>\n<li>new\uff1an \u4e2a\u5b9e\u4f8b<\/li>\n<li>ThreadLocal\uff1a1 \u4e2a\u5b9e\u4f8b<\/li>\n<\/ul>\n<p>\u4f46\u662f\uff0c\u5982\u679c\u662f n \u4e2a\u7ebf\u7a0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u53ea\u6267\u884c 1 \u6b21 <code>format<\/code> \u5462\uff1f<\/p>\n<ul>\n<li>new\uff1an \u4e2a\u5b9e\u4f8b<\/li>\n<li>ThreadLocal\uff1an \u4e2a\u5b9e\u4f8b<\/li>\n<\/ul>\n<p>\u5f88\u663e\u7136\uff0c\u5982\u679c\u4f7f\u7528 <code>ThreadLocal<\/code> \u7684\u8bdd\uff0c\u7ebf\u7a0b\u5e94\u8be5\u662f\u80fd\u590d\u7528\u7684\uff0c\u5426\u5219\u548c <code>new<\/code> \u7684\u6548\u679c\u662f\u4e00\u6837\u6ef4<\/p>\n<p>\u518d\u770b\u52a0\u9501\u548c\u6c60\u7684\u5dee\u522b\uff0c\u4e3b\u8981\u8868\u73b0\u5728\u5e76\u53d1\u6027\u80fd\u65b9\u9762\uff0c\u52a0\u9501\u5b9e\u9645\u5bfc\u81f4\u4e86\u4e32\u884c\u5316\uff0c\u4e0d\u6ee1\u8db3\u9ad8\u5e76\u53d1\u7684\u573a\u5408<\/p>\n<p>\u518d\u770b\u4e0b\u6c60\u548c <code>ThreadLocal<\/code> \u7684\u5dee\u522b<\/p>\n<ul>\n<li>\u5e76\u53d1\u6027\u80fd\u4e0a 2 \u8005\u90fd\u5f88\u4f18\u79c0<\/li>\n<li>\u76f8\u5bf9\u6765\u8bf4 <code>ThreadLocal<\/code> \u7684\u5b9e\u73b0\u66f4\u7b80\u5355\uff0c\u800c\u4e14\u5b8c\u5168\u4e0d\u9700\u8981\u52a0\u9501\u6216\u540c\u6b65\uff0c\u800c\u6c60\u5728\u7ba1\u7406\u6c60\u5185\u7684\u5143\u7d20\u65f6\u514d\u4e0d\u4e86\u9700\u8981\u52a0\u9501\u6216\u540c\u6b65<\/li>\n<li>\u6c60\u7684\u590d\u7528\u6027\u6700\u597d\uff0c\u800c <code>ThreadLocal<\/code> \u7684\u590d\u7528\u6027\u5219\u5b8c\u5168\u53d6\u51b3\u4e8e\u5176\u5bbf\u4e3b\u7ebf\u7a0b\u7684\u590d\u7528\u6027<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u8d77\u56e0 sonar \u662f\u4e00\u4e2a\u4ee3\u7801\u8d28\u91cf\u7ba1\u7406\u5de5\u5177\uff0c\u67d0\u5929\u5b83\u63ed\u9732\u4e86\u4ee3\u7801\u91cc\u8fd9\u6837\u4e00\u4e2a\u7ea7\u522b\u4e3a\u4e25\u91cd\u7684\u8fdd\u89c4 SimpleDateFo [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[23,22],"class_list":["post-244","post","type-post","status-publish","format-standard","hentry","category-java","tag-threadlocal","tag-22"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u804a\u804a Java \u7ebf\u7a0b\u5b89\u5168 - \u62d2\u6d77\u7a7a\u95f4<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/refusea.com\/?p=244\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"refusea.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 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