{"id":78860,"date":"2024-03-20T20:23:37","date_gmt":"2024-03-20T11:23:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%a7%e3%83%ad%e3%82%b0%e3%82%a4%e3%83%b3%e8%aa%8d%e8%a8%bc%e3%81%ab%e4%bd%bf%e3%81%86captcha%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/"},"modified":"2025-08-12T04:14:02","modified_gmt":"2025-08-11T19:14:02","slug":"java%e3%81%a7%e3%83%ad%e3%82%b0%e3%82%a4%e3%83%b3%e8%aa%8d%e8%a8%bc%e3%81%ab%e4%bd%bf%e3%81%86captcha%e3%82%92%e4%bd%9c%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\/java%e3%81%a7%e3%83%ad%e3%82%b0%e3%82%a4%e3%83%b3%e8%aa%8d%e8%a8%bc%e3%81%ab%e4%bd%bf%e3%81%86captcha%e3%82%92%e4%bd%9c%e6%88%90%e3%81%99%e3%82%8b%e6%96%b9%e6%b3%95\/","title":{"rendered":"Java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046CAPTCHA\u3092\u4f5c\u6210\u306e\u65b9\u6cd5"},"content":{"rendered":"

Java\u306e\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306e\u305f\u3081\u306e\u30ad\u30e3\u30d7\u30c1\u30e3\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3044\u307e\u3059\u3002<\/p>\n

    \n
  1. \u30e9\u30f3\u30c0\u30e0\u306a\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3001Java \u306e\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u30e9\u30f3\u30c0\u30e0\u306a\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Random \u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066 4 \u6841\u306e\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
    Random<\/span> random<\/span> =<\/span> new<\/span> Random<\/span>();\r\nint<\/span> code<\/span> =<\/span> random.nextInt(9000<\/span>) + 1000<\/span>;\r\nString<\/span> captchaCode<\/span> =<\/span> String.valueOf(code);\r\n<\/code><\/pre>\n
      \n
    1. \u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u6642\u306b\u6bd4\u8f03\u3059\u308b\u305f\u3081\u306b\u3001\u751f\u6210\u3055\u308c\u305f\u8a8d\u8a3c\u30b3\u30fc\u30c9\u3092\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u4fdd\u5b58\u3057\u307e\u3059\u3002\u8a8d\u8a3c\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3059\u308b\u306b\u306f\u3001HttpSession\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
      HttpSession<\/span> session<\/span> =<\/span> request.getSession();\r\nsession.setAttribute(\"captchaCode\"<\/span>, captchaCode);\r\n<\/code><\/pre>\n
        \n
      1. \u30ed\u30b0\u30a4\u30f3\u753b\u9762\u306bCAPTCHA\u753b\u50cf\u3092\u8868\u793a\u3057\u307e\u3059\u3002CAPTCHA\u753b\u50cf\u306f\u3001\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea\u3084\u72ec\u81ea\u306e\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u751f\u6210\u3057\u3001\u30ed\u30b0\u30a4\u30f3\u753b\u9762\u306b\u8868\u793a\u3067\u304d\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Kaptcha\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3057\u3066\u3001CAPTCHA\u753b\u50cf\u3092\u751f\u6210\u3067\u304d\u307e\u3059\u3002<\/li>\n<\/ol>\n
        <dependency>\r\n    <groupId>com.github.penggle<\/groupId>\r\n    <artifactId>kaptcha<\/artifactId>\r\n    <version>2.3<\/span>.2<\/span><\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\n
        \/\/ \u751f\u6210\u9a8c\u8bc1\u7801\u56fe\u7247<\/span>\r\nKaptchaUtil.createCaptcha(response.getOutputStream(), captchaCode);\r\n<\/code><\/pre>\n
          \n
        1. \u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u6642\u306b\u3001\u30e6\u30fc\u30b6\u304c\u5165\u529b\u3057\u305f\u8a8d\u8a3c\u30b3\u30fc\u30c9\u3068\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u4fdd\u5b58\u3055\u308c\u305f\u8a8d\u8a3c\u30b3\u30fc\u30c9\u304c\u4e00\u81f4\u3059\u308b\u304b\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n
          String<\/span> userInputCode<\/span> =<\/span> request.getParameter(\"captchaCode\"<\/span>);\r\nString<\/span> sessionCode<\/span> =<\/span> (String) session.getAttribute(\"captchaCode\"<\/span>);\r\n\r\nif<\/span> (userInputCode.equalsIgnoreCase(sessionCode)) {\r\n    \/\/ \u9a8c\u8bc1\u7801\u6b63\u786e\uff0c\u7ee7\u7eed\u767b\u5f55\u9a8c\u8bc1\u64cd\u4f5c<\/span>\r\n    \/\/ ...<\/span>\r\n} else<\/span> {\r\n    \/\/ \u9a8c\u8bc1\u7801\u9519\u8bef\uff0c\u63d0\u793a\u7528\u6237\u91cd\u65b0\u8f93\u5165<\/span>\r\n    \/\/ ...<\/span>\r\n}\r\n<\/code><\/pre>\n
          \u3053\u306e\u3088\u3046\u306b\u3057\u3066Java\u306e\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u30b3\u30fc\u30c9\u6a5f\u80fd\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002\u6ce8\u610f\u3001\u4e0a\u8a18\u306f\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u307f\u3067\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u306f\u5b9f\u969b\u306e\u30cb\u30fc\u30ba\u306b\u5408\u308f\u305b\u3066\u8abf\u6574\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u8a8d\u8a3c\u30b3\u30fc\u30c9\u306e\u5b89\u5168\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u6570\u5024\u3092\u751f\u6210\u3059\u308b\u969b\u306b\u306fSecureRandom\u30af\u30e9\u30b9\u3092\u4f7f\u7528\u3057\u3066\u751f\u6210\u3059\u308b\u306a\u3069\u306e\u5b89\u5168\u306a\u65b9\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          Java\u306e\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306e\u305f\u3081\u306e\u30ad\u30e3\u30d7\u30c1\u30e3\u6a5f\u80fd\u3092\u5b9f\u88c5\u3059\u308b\u306b\u306f\u4ee5\u4e0b\u306e\u624b\u9806\u306b\u5f93\u3044\u307e\u3059\u3002 \u30e9\u30f3\u30c0\u30e0\u306a\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u4f5c\u6210\u3057\u3001Java \u306e\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3092\u4f7f\u7528\u3057\u3066\u30e9\u30f3\u30c0\u30e0\u306a\u691c\u8a3c\u30b3\u30fc\u30c9\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Rand […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-78860","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\nJava\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046CAPTCHA\u3092\u4f5c\u6210\u306e\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046CAPTCHA\u3092\u4f5c\u6210\u306e\u65b9\u6cd5\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046captcha\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046CAPTCHA\u3092\u4f5c\u6210\u306e\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046CAPTCHA\u3092\u4f5c\u6210\u306e\u65b9\u6cd5\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002\u5b9f\u8df5\u7684\u306a\u4f8b\u3068\u30b3\u30fc\u30c9\u3001\u6ce8\u610f\u70b9\u3092\u542b\u3081\u3066\u521d\u5fc3\u8005\u306b\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u8aac\u660e\u3057\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/java\u3067\u30ed\u30b0\u30a4\u30f3\u8a8d\u8a3c\u306b\u4f7f\u3046captcha\u3092\u4f5c\u6210\u3059\u308b\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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