ServletContextListener\u306f\u79c1\u305f\u3061\u304c\u6301\u3063\u3066\u3044\u308b\u591a\u304f\u306eServlet\u30ea\u30b9\u30ca\u30fc\u306e1\u3064\u3067\u3059\u3002\u3053\u308c\u306fJava Web Application\u30b7\u30ea\u30fc\u30ba\u306e5\u756a\u76ee\u306e\u8a18\u4e8b\u3067\u3042\u308a\u3001\u4ee5\u524d\u306e4\u3064\u306e\u8a18\u4e8b\u3082\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u306f\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30b9\u30ca\u30fc\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30b9\u30ca\u30fc\u306e\u5229\u70b9\u3001\u30ea\u30b9\u30ca\u30fc\u3092\u4f7f\u7528\u3057\u3066\u884c\u3048\u308b\u4e00\u822c\u7684\u306a\u30bf\u30b9\u30af\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8API\u306e\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3084\u30a4\u30d9\u30f3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001ServletContext\u3001Session\u3001ServletRequest\u306e\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u30ea\u30b9\u30ca\u30fc\u5b9f\u88c5\u306e\u4f8b\u3092\u793a\u3059\u305f\u3081\u306b\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u30a6\u30a7\u30d6\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n
\u79c1\u305f\u3061\u306f\u3001ServletContext\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ed6\u306e\u3059\u3079\u3066\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b9\u30b3\u30fc\u30d7\u306e\u5c5e\u6027\u3092\u4f5c\u6210\u3067\u304d\u308b\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u8a18\u8ff0\u5b50\uff08web.xml\uff09\u3067\u306f\u3001ServletContext\u306e\u521d\u671f\u5316\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6587\u5b57\u5217\u306e\u307f\u3067\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u79c1\u305f\u3061\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u6307\u5411\u3067\u3042\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u306e\u305f\u3081\u306bServletContext\u306b\u5c5e\u6027\u3092\u8a2d\u5b9a\u3057\u305f\u3044\u5834\u5408\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u5358\u4e00\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u30dd\u30a4\u30f3\u30c8\uff08\u30e6\u30fc\u30b6\u30fc\u30ed\u30b0\u30a4\u30f3\uff09\u304c\u3042\u308b\u5834\u5408\u3001\u6700\u521d\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u8907\u6570\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u308b\u5834\u5408\u3001\u3059\u3079\u3066\u306e\u5834\u6240\u3067\u884c\u3046\u3068\u30b3\u30fc\u30c9\u306e\u91cd\u8907\u304c\u751f\u3058\u307e\u3059\u3002\u307e\u305f\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u30c0\u30a6\u30f3\u3057\u3066\u3044\u308b\u304b\u3001\u6b63\u3057\u304f\u69cb\u6210\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u6700\u521d\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u3088\u3046\u306a\u30b7\u30ca\u30ea\u30aa\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8API\u306f\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u30a4\u30d9\u30f3\u30c8\u3092\u805e\u304f\u305f\u3081\u306e\u5b9f\u88c5\u3068\u69cb\u6210\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30a4\u30d9\u30f3\u30c8\u3068\u306f\u4f55\u304b\u304c\u8d77\u3053\u308b\u3053\u3068\u3067\u3042\u308a\u3001Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4e16\u754c\u3067\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u521d\u671f\u5316\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7834\u68c4\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u4f5c\u6210\/\u7834\u68c4\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u5185\u306e\u5c5e\u6027\u306e\u5909\u66f4\u306a\u3069\u3068\u3044\u3063\u305f\u3053\u3068\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8API\u3067\u306f\u3001\u7279\u5b9a\u306e\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u969b\u306b\u4f55\u304b\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u5b9f\u88c5\u3068\u69cb\u6210\u3067\u304d\u308b\u3055\u307e\u3056\u307e\u306a\u30bf\u30a4\u30d7\u306e\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u4e0a\u8a18\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u8d77\u52d5\u30a4\u30d9\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u30ea\u30b9\u30ca\u30fc\u3092\u4f5c\u6210\u3057\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u521d\u671f\u5316\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8aad\u307f\u53d6\u308a\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u3092\u4f5c\u6210\u3057\u3066\u4ed6\u306e\u30ea\u30bd\u30fc\u30b9\u304c\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5c5e\u6027\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
Servlet API\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e\u30a4\u30d9\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u7570\u306a\u308b\u30bf\u30a4\u30d7\u306e\u30ea\u30b9\u30ca\u30fc\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001\u540c\u69d8\u306e\u30a4\u30d9\u30f3\u30c8\u306e\u30b0\u30eb\u30fc\u30d7\u3068\u4e00\u7dd2\u306b\u4f5c\u696d\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u5ba3\u8a00\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001ServletContext\u30ea\u30b9\u30ca\u30fc\u306f\u3001\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u8d77\u52d5\u304a\u3088\u3073\u30b7\u30e3\u30c3\u30c8\u30c0\u30a6\u30f3\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30ea\u30b9\u30ca\u30fc\u3067\u3059\u3002\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5165\u529b\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u307e\u3059\u3002\u30a4\u30d9\u30f3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30ea\u30b9\u30ca\u30fc\u306b\u7279\u5b9a\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u63d0\u4f9b\u3059\u308b\u30e9\u30c3\u30d1\u30fc\u3068\u3057\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002Servlet API\u306f\u4ee5\u4e0b\u306e\u30a4\u30d9\u30f3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
<\/p>\n
Servlet API\u306b\u306f\u3001\u6b21\u306e\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
javax.servlet.ServletContextListener – ServletContext\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u5909\u66f4\u306b\u95a2\u3059\u308b\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.ServletContextAttributeListener – ServletContext\u5c5e\u6027\u306e\u5909\u66f4\u306b\u95a2\u3059\u308b\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.ServletRequestListener – \u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30b9\u30b3\u30fc\u30d7\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u5165\u3063\u3066\u304d\u305f\u308a\u51fa\u3066\u884c\u3063\u305f\u308a\u3059\u308b\u969b\u306e\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.ServletRequestAttributeListener – ServletRequest\u5c5e\u6027\u306e\u5909\u66f4\u306b\u95a2\u3059\u308b\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.http.HttpSessionListener – HttpSession\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u5909\u66f4\u306b\u95a2\u3059\u308b\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.http.HttpSessionBindingListener – \u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u30d0\u30a4\u30f3\u30c9\u307e\u305f\u306f\u30a2\u30f3\u30d0\u30a4\u30f3\u30c9\u3055\u308c\u305f\u969b\u306b\u901a\u77e5\u3092\u53d7\u3051\u308b\u305f\u3081\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6307\u5b9a\u3059\u308b\u3002<\/p>\n
javax.servlet.http.HttpSessionAttributeListener – HttpSession\u5c5e\u6027\u306e\u5909\u66f4\u306b\u95a2\u3059\u308b\u901a\u77e5\u30a4\u30d9\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/p>\n
javax.servlet.http.HttpSessionActivationListener – \u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u30d0\u30a4\u30f3\u30c9\u3055\u308c\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u30d1\u30c3\u30b7\u30d9\u30fc\u30c8\u3055\u308c\u308b\u3053\u3068\u3084\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u30a2\u30af\u30c6\u30a3\u30d6\u5316\u3055\u308c\u308b\u3053\u3068\u3092\u901a\u77e5\u3059\u308b\u30b3\u30f3\u30c6\u30ca\u30a4\u30d9\u30f3\u30c8\u3092\u30ea\u30c3\u30b9\u30f3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30bb\u30c3\u30b7\u30e7\u30f3\u3092VM\u9593\u3067\u79fb\u884c\u307e\u305f\u306f\u6c38\u7d9a\u5316\u3059\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u3001HttpSessionActivationListener\u3092\u5b9f\u88c5\u3057\u305f\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u30d0\u30a4\u30f3\u30c9\u3055\u308c\u305f\u3059\u3079\u3066\u306e\u5c5e\u6027\u306b\u901a\u77e5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30b9\u30ca\u30fc\u306e\u8a2d\u5b9a<\/p>\n
@WebListener\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30af\u30e9\u30b9\u3092\u30ea\u30b9\u30ca\u30fc\u3068\u3057\u3066\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u306e\u30af\u30e9\u30b9\u306f1\u3064\u4ee5\u4e0a\u306e\u30ea\u30b9\u30ca\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002web.xml\u306b\u30ea\u30b9\u30ca\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
<listener>\r\n <listener-class>\r\n com.scdev.listener.AppContextListener\r\n <\/listener-class>\r\n<\/listener>\r\n<\/code><\/pre>\n\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30b9\u30ca\u30fc\u306e\u4f8b<\/ol>\nServlet\u30ea\u30b9\u30ca\u30fc\u3092\u52d5\u4f5c\u3055\u305b\u308b\u305f\u3081\u306e\u30b7\u30f3\u30d7\u30eb\u306aWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3057\u3087\u3046\u3002Eclipse ServletListenerExample\u5185\u306b\u52d5\u7684Web\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u4ee5\u4e0b\u306e\u30a4\u30e1\u30fc\u30b8\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u69cb\u9020\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002web.xml\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u521d\u671f\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u30ea\u30b9\u30ca\u30fc\u306e\u8a2d\u5b9a\u3092\u30c7\u30d7\u30ed\u30a4\u8a18\u8ff0\u5b50\u3067\u5b9a\u7fa9\u3057\u307e\u3059\u3002<\/p>\n
<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<web-app xmlns:xsi=\"https:\/\/www.w3.org\/2001\/XMLSchema-instance\" xmlns=\"https:\/\/java.sun.com\/xml\/ns\/javaee\" xsi:schemaLocation=\"https:\/\/java.sun.com\/xml\/ns\/javaee https:\/\/java.sun.com\/xml\/ns\/javaee\/web-app_3_0.xsd\" id=\"WebApp_ID\" version=\"3.0\">\r\n <display-name>ServletListenerExample<\/display-name>\r\n \r\n <context-param>\r\n <param-name>DBUSER<\/param-name>\r\n <param-value>scdev<\/param-value>\r\n <\/context-param>\r\n <context-param>\r\n <param-name>DBPWD<\/param-name>\r\n <param-value>password<\/param-value>\r\n <\/context-param>\r\n <context-param>\r\n <param-name>DBURL<\/param-name>\r\n <param-value>jdbc:mysql:\/\/localhost\/mysql_db<\/param-value>\r\n <\/context-param>\r\n \r\n <listener>\r\n <listener-class>com.scdev.listener.AppContextListener<\/listener-class>\r\n <\/listener>\r\n <listener>\r\n <listener-class>com.scdev.listener.AppContextAttributeListener<\/listener-class>\r\n <\/listener>\r\n <listener>\r\n <listener-class>com.scdev.listener.MySessionListener<\/listener-class>\r\n <\/listener>\r\n <listener>\r\n <listener-class>com.scdev.listener.MyServletRequestListener<\/listener-class>\r\n <\/listener>\r\n<\/web-app>\r\n<\/code><\/pre>\nDBConnectionManager: \u3053\u308c\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u63a5\u7d9a\u6027\u306b\u95a2\u3059\u308b\u30af\u30e9\u30b9\u3067\u3059\u3002\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u63a5\u7d9a\u306e\u305f\u3081\u306e\u30b3\u30fc\u30c9\u306f\u7701\u7565\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5c5e\u6027\u3068\u3057\u3066\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n
package com.scdev.db;\r\n\r\nimport java.sql.Connection;\r\n\r\npublic class DBConnectionManager {\r\n\r\n\tprivate String dbURL;\r\n\tprivate String user;\r\n\tprivate String password;\r\n\tprivate Connection con;\r\n\t\r\n\tpublic DBConnectionManager(String url, String u, String p){\r\n\t\tthis.dbURL=url;\r\n\t\tthis.user=u;\r\n\t\tthis.password=p;\r\n\t\t\/\/create db connection now\r\n\t\t\r\n\t}\r\n\t\r\n\tpublic Connection getConnection(){\r\n\t\treturn this.con;\r\n\t}\r\n\t\r\n\tpublic void closeConnection(){\r\n\t\t\/\/close DB connection here\r\n\t}\r\n}\r\n<\/code><\/pre>\nMyServlet: \u30bb\u30c3\u30b7\u30e7\u30f3\u3001\u5c5e\u6027\u306a\u3069\u3092\u64cd\u4f5c\u3059\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30af\u30e9\u30b9\u3067\u3059\u3002<\/p>\n
package com.scdev.servlet;\r\n\r\nimport java.io.IOException;\r\nimport java.io.PrintWriter;\r\n\r\nimport javax.servlet.ServletContext;\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\nimport javax.servlet.http.HttpSession;\r\n\r\n@WebServlet(\"\/MyServlet\")\r\npublic class MyServlet extends HttpServlet {\r\n\tprivate static final long serialVersionUID = 1L;\r\n \r\n\tprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\t\t\tServletContext ctx = request.getServletContext();\r\n\t\t\tctx.setAttribute(\"User\", \"Pankaj\");\r\n\t\t\tString user = (String) ctx.getAttribute(\"User\");\r\n\t\t\tctx.removeAttribute(\"User\");\r\n\t\t\t\r\n\t\t\tHttpSession session = request.getSession();\r\n\t\t\tsession.invalidate();\r\n\t\t\t\r\n\t\t\tPrintWriter out = response.getWriter();\r\n\t\t\tout.write(\"Hi \"+user);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n\u4eca\u56de\u306f\u30ea\u30b9\u30ca\u30fc\u30af\u30e9\u30b9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308b\u30ea\u30b9\u30ca\u30fc\u306b\u95a2\u3057\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u306e\u30ea\u30b9\u30ca\u30fc\u30af\u30e9\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059 – ServletContextListener\u3001ServletContextAttributeListener\u3001ServletRequestListener\u3001\u305d\u3057\u3066HttpSessionListener\u300227.<\/p>\n
\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u521d\u671f\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3093\u3067\u3001DBConnectionManager\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3001\u305d\u308c\u3092ServletContext\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5c5e\u6027\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.listener;\r\n\r\nimport javax.servlet.ServletContext;\r\nimport javax.servlet.ServletContextEvent;\r\nimport javax.servlet.ServletContextListener;\r\nimport javax.servlet.annotation.WebListener;\r\n\r\nimport com.scdev.db.DBConnectionManager;\r\n\r\n@WebListener\r\npublic class AppContextListener implements ServletContextListener {\r\n\r\n public void contextInitialized(ServletContextEvent servletContextEvent) {\r\n \tServletContext ctx = servletContextEvent.getServletContext();\r\n \t\r\n \tString url = ctx.getInitParameter(\"DBURL\");\r\n \tString u = ctx.getInitParameter(\"DBUSER\");\r\n \tString p = ctx.getInitParameter(\"DBPWD\");\r\n \t\r\n \t\/\/create database connection from init parameters and set it to context\r\n \tDBConnectionManager dbManager = new DBConnectionManager(url, u, p);\r\n \tctx.setAttribute(\"DBManager\", dbManager);\r\n \tSystem.out.println(\"Database connection initialized for Application.\");\r\n }\r\n\r\n public void contextDestroyed(ServletContextEvent servletContextEvent) {\r\n \tServletContext ctx = servletContextEvent.getServletContext();\r\n \tDBConnectionManager dbManager = (DBConnectionManager) ctx.getAttribute(\"DBManager\");\r\n \tdbManager.closeConnection();\r\n \tSystem.out.println(\"Database connection closed for Application.\");\r\n \t\r\n }\r\n\t\r\n}\r\n<\/code><\/pre>\n\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5c5e\u6027\u30ea\u30b9\u30ca\u30fc<\/ol>\n\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u5c5e\u6027\u304c\u8ffd\u52a0\u3001\u524a\u9664\u3001\u307e\u305f\u306f\u7f6e\u304d\u63db\u3048\u3089\u308c\u305f\u3068\u304d\u306b\u30a4\u30d9\u30f3\u30c8\u3092\u30ed\u30b0\u306b\u8a18\u9332\u3059\u308b\u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5\u3002<\/p>\n
package com.scdev.listener;\r\n\r\nimport javax.servlet.ServletContextAttributeEvent;\r\nimport javax.servlet.ServletContextAttributeListener;\r\nimport javax.servlet.annotation.WebListener;\r\n\r\n@WebListener\r\npublic class AppContextAttributeListener implements ServletContextAttributeListener {\r\n\r\n public void attributeAdded(ServletContextAttributeEvent servletContextAttributeEvent) {\r\n \tSystem.out.println(\"ServletContext attribute added::{\"+servletContextAttributeEvent.getName()+\",\"+servletContextAttributeEvent.getValue()+\"}\");\r\n }\r\n\r\n public void attributeReplaced(ServletContextAttributeEvent servletContextAttributeEvent) {\r\n \tSystem.out.println(\"ServletContext attribute replaced::{\"+servletContextAttributeEvent.getName()+\",\"+servletContextAttributeEvent.getValue()+\"}\");\r\n }\r\n\r\n public void attributeRemoved(ServletContextAttributeEvent servletContextAttributeEvent) {\r\n \tSystem.out.println(\"ServletContext attribute removed::{\"+servletContextAttributeEvent.getName()+\",\"+servletContextAttributeEvent.getValue()+\"}\");\r\n }\r\n\t\r\n}\r\n<\/code><\/pre>\n\n- \n
HttpSessionListener<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u30ea\u30b9\u30ca\u30fc<\/ol>\n\u30bb\u30c3\u30b7\u30e7\u30f3\u304c\u4f5c\u6210\u307e\u305f\u306f\u7834\u68c4\u3055\u308c\u305f\u3068\u304d\u306b\u30a4\u30d9\u30f3\u30c8\u3092\u8a18\u9332\u3059\u308b\u305f\u3081\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u5b9f\u88c5\u3002<\/p>\n
package com.scdev.listener;\r\n\r\nimport javax.servlet.annotation.WebListener;\r\nimport javax.servlet.http.HttpSessionEvent;\r\nimport javax.servlet.http.HttpSessionListener;\r\n\r\n@WebListener\r\npublic class MySessionListener implements HttpSessionListener {\r\n\r\n public void sessionCreated(HttpSessionEvent sessionEvent) {\r\n \tSystem.out.println(\"Session Created:: ID=\"+sessionEvent.getSession().getId());\r\n }\r\n\r\n public void sessionDestroyed(HttpSessionEvent sessionEvent) {\r\n \tSystem.out.println(\"Session Destroyed:: ID=\"+sessionEvent.getSession().getId());\r\n }\r\n\t\r\n}\r\n<\/code><\/pre>\nServletRequestListener<\/ol>\n\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u521d\u671f\u5316\u3055\u308c\u308b\u969b\u3068\u7834\u68c4\u3055\u308c\u308b\u969b\u306b\u3001ServletRequestListener\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u7c21\u5358\u306a\u5b9f\u88c5\u3092\u4f7f\u7528\u3057\u3066\u3001ServletRequest\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u30ed\u30b0\u306b\u8a18\u9332\u3057\u307e\u3059\u3002<\/p>\n
package com.scdev.listener;\r\n\r\nimport javax.servlet.ServletRequest;\r\nimport javax.servlet.ServletRequestEvent;\r\nimport javax.servlet.ServletRequestListener;\r\nimport javax.servlet.annotation.WebListener;\r\n\r\n@WebListener\r\npublic class MyServletRequestListener implements ServletRequestListener {\r\n\r\n public void requestDestroyed(ServletRequestEvent servletRequestEvent) {\r\n \tServletRequest servletRequest = servletRequestEvent.getServletRequest();\r\n \tSystem.out.println(\"ServletRequest destroyed. Remote IP=\"+servletRequest.getRemoteAddr());\r\n }\r\n\r\n public void requestInitialized(ServletRequestEvent servletRequestEvent) {\r\n \tServletRequest servletRequest = servletRequestEvent.getServletRequest();\r\n \tSystem.out.println(\"ServletRequest initialized. Remote IP=\"+servletRequest.getRemoteAddr());\r\n }\r\n\t\r\n}\r\n<\/code><\/pre>\n\u79c1\u305f\u3061\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u5c55\u958b\u3057\u3001URL https:\/\/localhost:8080\/ServletListenerExample\/MyServlet \u3067\u30d6\u30e9\u30a6\u30b6\u304b\u3089MyServlet\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3068\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306b\u4ee5\u4e0b\u306e\u30ed\u30b0\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
ServletContext attribute added::{DBManager,com.scdev.db.DBConnectionManager@4def3d1b}\r\nDatabase connection initialized for Application.\r\nServletContext attribute added::{org.apache.jasper.compiler.TldLocationsCache,org.apache.jasper.compiler.TldLocationsCache@1594df96}\r\n\r\nServletRequest initialized. Remote IP=0:0:0:0:0:0:0:1%0\r\nServletContext attribute added::{User,Pankaj}\r\nServletContext attribute removed::{User,Pankaj}\r\nSession Created:: ID=8805E7AE4CCCF98AFD60142A6B300CD6\r\nSession Destroyed:: ID=8805E7AE4CCCF98AFD60142A6B300CD6\r\nServletRequest destroyed. Remote IP=0:0:0:0:0:0:0:1%0\r\n\r\n\r\nServletRequest initialized. Remote IP=0:0:0:0:0:0:0:1%0\r\nServletContext attribute added::{User,Pankaj}\r\nServletContext attribute removed::{User,Pankaj}\r\nSession Created:: ID=88A7A1388AB96F611840886012A4475F\r\nSession Destroyed:: ID=88A7A1388AB96F611840886012A4475F\r\nServletRequest destroyed. Remote IP=0:0:0:0:0:0:0:1%0\r\n\r\n\r\nDatabase connection closed for Application.\r\n<\/code><\/pre>\n\u30ed\u30b0\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u306b\u6ce8\u610f\u3057\u3001\u5b9f\u884c\u306e\u9806\u5e8f\u306b\u5f93\u3063\u3066\u3044\u307e\u3059\u3002\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u307e\u305f\u306f\u30b3\u30f3\u30c6\u30ca\u3092\u30b7\u30e3\u30c3\u30c8\u30c0\u30a6\u30f3\u3059\u308b\u969b\u306b\u3001\u6700\u5f8c\u306e\u30ed\u30b0\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u30ea\u30b9\u30ca\u30fc\u306b\u95a2\u3057\u3066\u306f\u4ee5\u4e0a\u3067\u3059\u3002\u6b21\u306f\u30af\u30c3\u30ad\u30fc\u3068\u4e00\u822c\u7684\u306a\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u306e\u4f8b\u3092\u8abf\u3079\u307e\u3059\u3002\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306f\u4ee5\u4e0b\u306e\u30ea\u30f3\u30af\u304b\u3089\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u3001\u3088\u308a\u8a73\u3057\u304f\u5b66\u3076\u305f\u3081\u306b\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u30ea\u30b9\u30ca\u30fc\u306e\u4f8b\u984c\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9<\/p>\n
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