{"id":16569,"date":"2024-03-16T04:28:44","date_gmt":"2024-03-15T19:28:44","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%a7%e3%81%af%e3%80%81%e3%82%bb%e3%83%83%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e5%ad%98%e5%9c%a8%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b\/"},"modified":"2025-08-06T07:48:31","modified_gmt":"2025-08-05T22:48:31","slug":"java-%e3%81%a7%e3%81%af%e3%80%81%e3%82%bb%e3%83%83%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e5%ad%98%e5%9c%a8%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java-%e3%81%a7%e3%81%af%e3%80%81%e3%82%bb%e3%83%83%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e5%ad%98%e5%9c%a8%e3%82%92%e3%81%a9%e3%81%ae%e3%82%88%e3%81%86%e3%81%ab%e5%88%a4%e6%96%ad%e3%81%99%e3%82%8b\/","title":{"rendered":"Java \u3067\u306f\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u5b58\u5728\u3092\u3069\u306e\u3088\u3046\u306b\u5224\u65ad\u3059\u308b\u306e\u304b\u3002"},"content":{"rendered":"<p>Java\u3067\u306f\u3001HttpSession\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306egetAttribute()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u6709\u7121\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002getAttribute()\u30e1\u30bd\u30c3\u30c9\u304cnull\u3092\u8fd4\u3059\u3068\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u5f53\u524d\u8bf7\u6c42\u7684session\u5bf9\u8c61<\/span>\r\n<span class=\"hljs-type\">HttpSession<\/span> <span class=\"hljs-variable\">session<\/span> <span class=\"hljs-operator\">=<\/span> request.getSession(<span class=\"hljs-literal\">false<\/span>);\r\n\r\n<span class=\"hljs-comment\">\/\/ \u5224\u65adsession\u662f\u5426\u5b58\u5728<\/span>\r\n<span class=\"hljs-keyword\">if<\/span> (session != <span class=\"hljs-literal\">null<\/span> &amp;&amp; session.getAttribute(<span class=\"hljs-string\">\"username\"<\/span>) != <span class=\"hljs-literal\">null<\/span>) {\r\n    <span class=\"hljs-comment\">\/\/ session\u5b58\u5728<\/span>\r\n    <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">username<\/span> <span class=\"hljs-operator\">=<\/span> (String) session.getAttribute(<span class=\"hljs-string\">\"username\"<\/span>);\r\n    System.out.println(<span class=\"hljs-string\">\"\u5f53\u524d\u7528\u6237\u662f\uff1a\"<\/span> + username);\r\n} <span class=\"hljs-keyword\">else<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ session\u4e0d\u5b58\u5728<\/span>\r\n    System.out.println(<span class=\"hljs-string\">\"session\u4e0d\u5b58\u5728\"<\/span>);\r\n}\r\n<\/code><\/pre>\n<p>\u4f8b\u3048\u3070\u3001request.getSession(false)\u3092\u4f7f\u7528\u3057\u3066\u3001\u73fe\u5728\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u3001false\u3092\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3068\u3057\u3066\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306b\u65b0\u3057\u3044\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001getAttribute\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u30c7\u30fc\u30bf\uff08\u4f8b\uff1a\u30e6\u30fc\u30b6\u30fc\u540d\uff09\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002 getAttribute\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u304cnull\u3092\u8fd4\u3059\u5834\u5408\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u3067\u306f\u3001HttpSession\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306egetAttribute()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u6709\u7121\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002getAttribute()\u30e1\u30bd\u30c3\u30c9\u304cnull\u3092\u8fd4\u3059\u3068\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-16569","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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