{"id":2165,"date":"2022-12-05T21:14:27","date_gmt":"2022-12-05T13:14:27","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2165"},"modified":"2022-12-07T10:12:20","modified_gmt":"2022-12-07T02:12:20","slug":"servlet-servletcontext%e5%af%b9%e8%b1%a1%e4%bd%9c%e7%94%a8%e7%9a%84%e6%bc%94%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2165","title":{"rendered":"Servlet-ServletContext\u5bf9\u8c61\u4f5c\u7528\u7684\u6f14\u793a"},"content":{"rendered":"\n<p>\u4ec0\u4e48\u662f ServletContext?<br>1\u3001ServletContext \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u8868\u793a Servlet \u4e0a\u4e0b\u6587\u5bf9\u8c61<br>2\u3001\u4e00\u4e2a web \u5de5\u7a0b\uff0c\u53ea\u6709\u4e00\u4e2a ServletContext \u5bf9\u8c61\u5b9e\u4f8b\u3002<br>3\u3001ServletContext \u5bf9\u8c61\u662f\u4e00\u4e2a\u57df\u5bf9\u8c61\u3002<br>4\u3001ServletContext \u662f\u5728 web \u5de5\u7a0b\u90e8\u7f72\u542f\u52a8\u7684\u65f6\u5019\u521b\u5efa\u3002\u5728 web \u5de5\u7a0b\u505c\u6b62\u7684\u65f6\u5019\u9500\u6bc1\u3002<\/p>\n\n\n\n<p>ServletContext \u7c7b\u7684\u56db\u4e2a\u4f5c\u7528<br>1\u3001\u83b7\u53d6 web.xml \u4e2d\u914d\u7f6e\u7684\u4e0a\u4e0b\u6587\u53c2\u6570 context-param<br>2\u3001\u83b7\u53d6\u5f53\u524d\u7684\u5de5\u7a0b\u8def\u5f84\uff0c\u683c\u5f0f: \/\u5de5\u7a0b\u8def\u5f84<br>3\u3001\u83b7\u53d6\u5de5\u7a0b\u90e8\u7f72\u540e\u5728\u670d\u52a1\u5668\u786c\u76d8\u4e0a\u7684\u7edd\u5bf9\u8def\u5f84<br>4\u3001\u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P133; \/**\r\n * @author RichieZhang\r\n * @create 2022-12-05 \u4e0b\u5348 12:45\r\n *\/\r\n\r\nimport jakarta.servlet.*;\r\nimport jakarta.servlet.http.*;\r\n\r\nimport java.io.IOException;\r\n\r\npublic class ContextServlet extends HttpServlet {\r\n    @Override\r\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\/\/        1\u3001\u83b7\u53d6 web.xml \u4e2d\u914d\u7f6e\u7684\u4e0a\u4e0b\u6587\u53c2\u6570 context-param\r\n        ServletContext context = getServletConfig().getServletContext();\r\n        String username = context.getInitParameter(\"username\");\r\n        System.out.println(\"context-param\u53c2\u6570username\u7684\u503c\u662f\" + username);\r\n        System.out.println(\"context-param\u53c2\u6570password\u7684\u503c\u662f\" + context.getInitParameter(\"password\"));\r\n        \/\/init-param\u53ea\u80fd\u88abServletConfig\u83b7\u53d6\r\n        System.out.println(\"init-param\u53c2\u6570url\u7684\u503c\u662f\" + context.getInitParameter(\"url\"));\r\n\r\n\/\/        2\u3001\u83b7\u53d6\u5f53\u524d\u7684\u5de5\u7a0b\u8def\u5f84\uff0c\u683c\u5f0f: \/\u5de5\u7a0b\u8def\u5f84\r\n        System.out.println(\"\u5f53\u524d\u5de5\u7a0b\u8def\u5f84\uff1a\" + context.getContextPath());\r\n\r\n\/\/        3\u3001\u83b7\u53d6\u5de5\u7a0b\u90e8\u7f72\u540e\u5728\u670d\u52a1\u5668\u786c\u76d8\u4e0a\u7684\u7edd\u5bf9\u8def\u5f84\r\n        \/**\r\n         * \u659c\u6760\u88ab\u670d\u52a1\u5668\u89e3\u6790\u5730\u5740\u4e3a\uff1ahttp:\/\/ip:port\/\u5de5\u7a0b\u540d\/  \u6620\u5c04\u5230IDEA\u4ee3\u7801\u7684web\u76ee\u5f55&lt;br\/>\r\n         *\/\r\n        System.out.println(\"\u5de5\u7a0b\u90e8\u7f72\u7684\u8def\u5f84\u662f\uff1a\" + context.getRealPath(\"\/\"));\r\n        System.out.println(\"\u5de5\u7a0b\u4e0bcss\u76ee\u5f55\u7684\u7edd\u5bf9\u8def\u5f84\u662f\uff1a\" + context.getRealPath(\"\/css\"));\r\n        System.out.println(\"\u5de5\u7a0b\u4e0bimgs\u76ee\u5f551.jpg\u7684\u7edd\u5bf9\u8def\u5f84\u662f\uff1a\" + context.getRealPath(\"\/imgs\/1.jpg\"));\r\n\r\n    }\r\n\r\n    @Override\r\n    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\r\n    }\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>    &lt;servlet&gt;\n        &lt;servlet-name&gt;ContextServlet&lt;\/servlet-name&gt;\n        &lt;servlet-class&gt;top.qaqaq.P133.ContextServlet&lt;\/servlet-class&gt;\n    &lt;\/servlet&gt;\n    &lt;servlet-mapping&gt;\n        &lt;servlet-name&gt;ContextServlet&lt;\/servlet-name&gt;\n        &lt;url-pattern&gt;\/contextServlet&lt;\/url-pattern&gt;\n    &lt;\/servlet-mapping&gt;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662f ServletContext?1\u3001ServletContext \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u8868\u793a Servlet \u4e0a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[61],"class_list":["post-2165","post","type-post","status-publish","format-standard","hentry","category-javaweb-code","tag-javaweb"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2165"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2165"}],"version-history":[{"count":3,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2165\/revisions"}],"predecessor-version":[{"id":2194,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2165\/revisions\/2194"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}