{"id":74980,"date":"2024-03-20T15:08:15","date_gmt":"2024-03-20T06:08:15","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/log4j2%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e5%ae%9a%e6%9c%9f%e7%9a%84%e3%81%ab%e7%94%9f%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-11T09:55:33","modified_gmt":"2025-08-11T00:55:33","slug":"log4j2%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e5%ae%9a%e6%9c%9f%e7%9a%84%e3%81%ab%e7%94%9f%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/log4j2%e3%81%a7%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e3%82%92%e5%ae%9a%e6%9c%9f%e7%9a%84%e3%81%ab%e7%94%9f%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"log4j2\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u5b9a\u671f\u7684\u306b\u751f\u6210\u306e\u65b9\u6cd5"},"content":{"rendered":"<p>log4j2\u3067\u3001RollingFileAppender\u3092\u30d5\u30a1\u30a4\u30eb\u306e\u81ea\u52d5\u751f\u6210\u306b\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001\u6bce\u65e5\u65b0\u3057\u3044\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3059\u308b\u30b5\u30f3\u30d7\u30eb\u69cb\u6210\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">&lt;?xml version=<span class=\"hljs-string\">\"1.0\"<\/span> encoding=<span class=\"hljs-string\">\"UTF-8\"<\/span>?&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">Configuration<\/span> <span class=\"hljs-attr\">status<\/span>=<span class=\"hljs-string\">\"INFO\"<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">Appenders<\/span>&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">RollingFile<\/span> <span class=\"hljs-attr\">name<\/span>=<span class=\"hljs-string\">\"RollingFile\"<\/span> <span class=\"hljs-attr\">fileName<\/span>=<span class=\"hljs-string\">\"logs\/app.log\"<\/span>\r\n                     <span class=\"hljs-attr\">filePattern<\/span>=<span class=\"hljs-string\">\"logs\/app-%d{yyyy-MM-dd}.log\"<\/span>&gt;<\/span>\r\n            <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">PatternLayout<\/span> <span class=\"hljs-attr\">pattern<\/span>=<span class=\"hljs-string\">\"%d [%t] %-5p %c{1}:%L - %m%n\"<\/span> \/&gt;<\/span>\r\n            <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">Policies<\/span>&gt;<\/span>\r\n                <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">TimeBasedTriggeringPolicy<\/span> \/&gt;<\/span>\r\n            <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">Policies<\/span>&gt;<\/span>\r\n            <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">DefaultRolloverStrategy<\/span> <span class=\"hljs-attr\">max<\/span>=<span class=\"hljs-string\">\"10\"<\/span> \/&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">RollingFile<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">Appenders<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">Loggers<\/span>&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">Root<\/span> <span class=\"hljs-attr\">level<\/span>=<span class=\"hljs-string\">\"info\"<\/span>&gt;<\/span>\r\n            <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">AppenderRef<\/span> <span class=\"hljs-attr\">ref<\/span>=<span class=\"hljs-string\">\"RollingFile\"<\/span> \/&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">Root<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">Loggers<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">Configuration<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b3\u30f3\u30d5\u30a3\u30ae\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u30d5\u30a1\u30a4\u30eb\u3067\u306f\u3001\u306b\u3088\u3063\u3066\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u540d\u3068\u30d5\u30a1\u30a4\u30eb\u30d1\u30bf\u30fc\u30f3\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002%d{yyyy-MM-dd}\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u540d\u304c1\u65e5\u3054\u3068\u306b\u65b0\u3057\u3044\u30d5\u30a1\u30a4\u30eb\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u30ed\u30fc\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u30dd\u30ea\u30b7\u30fc\u3092\u6307\u5b9a\u3057\u3066\u304a\u308a\u3001\u3053\u3053\u3067\u306f\u306b\u3088\u3063\u3066\u6642\u9593\u306b\u57fa\u3065\u3044\u3066\u30ed\u30fc\u30ea\u30f3\u30b0\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u307e\u3059\u3002\u3067\u306f\u30ed\u30fc\u30ea\u30f3\u30b0\u6226\u7565\u3092\u6307\u5b9a\u3057\u3066\u304a\u308a\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u6700\u592710\u500b\u306e\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002<\/p>\n<p>Log4j2.xml\u3068\u3044\u3046\u69cb\u6210\u30d5\u30a1\u30a4\u30eb\u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u4fdd\u5b58\u3057\u3001\u30af\u30e9\u30b9\u30d1\u30b9\u306b\u914d\u7f6e\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u6b21\u306b\u3001\u30b3\u30fc\u30c9\u3067Log4j2\u3092\u521d\u671f\u5316\u3059\u308b\u3068\u3001\u69cb\u6210\u3055\u308c\u305f\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb\u3067\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.logging.log4j.LogManager;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.logging.log4j.Logger;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyApp<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">final<\/span> <span class=\"hljs-type\">Logger<\/span> <span class=\"hljs-variable\">logger<\/span> <span class=\"hljs-operator\">=<\/span> LogManager.getLogger(MyApp.class);\r\n    \r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        logger.info(<span class=\"hljs-string\">\"Hello, World!\"<\/span>);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u30ed\u30b0\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u5185\u306b1\u65e51\u3064\u306e\u65b0\u3057\u3044\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\uff08\u4f8b: app-2022-01-01.log\u3001app-2022-01-02.log\uff09\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002\u5404\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30ed\u30b0\u60c5\u5831\u304c\u8a18\u9332\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>log4j2\u3092\u4f7f\u7528\u3059\u308b\u524d\u306b\u3001log4j2\u306e\u4f9d\u5b58\u95a2\u4fc2\u304c\u6b63\u3057\u304f\u8a2d\u5b9a\u3055\u308c\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306epom.xml\u307e\u305f\u306fbuild.gradle\u306b\u9069\u5207\u306a\u4f9d\u5b58\u95a2\u4fc2\u304c 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