{"id":2168,"date":"2022-12-05T21:16:15","date_gmt":"2022-12-05T13:16:15","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2168"},"modified":"2022-12-05T21:16:16","modified_gmt":"2022-12-05T13:16:16","slug":"servlet-servletcontext%e5%83%8fmap%e4%b8%80%e6%a0%b7%e5%ad%98%e5%8f%96%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2168","title":{"rendered":"Servlet-ServletContext\u50cfmap\u4e00\u6837\u5b58\u53d6\u6570\u636e"},"content":{"rendered":"\n<p>\u4ec0\u4e48\u662f\u57df\u5bf9\u8c61?<br>\u57df\u5bf9\u8c61\uff0c\u662f\u53ef\u4ee5\u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e\u7684\u5bf9\u8c61\uff0c\u53eb\u57df\u5bf9\u8c61\u3002<br>\u8fd9\u91cc\u7684\u57df\u6307\u7684\u662f\u5b58\u53d6\u6570\u636e\u7684\u64cd\u4f5c\u8303\u56f4\uff0c\u6574\u4e2a web \u5de5\u7a0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>                  \u5b58\u6570\u636e            \u53d6\u6570\u636e             \u5220\u9664 \u6570\u636e\r\nMap               put()             get()             remove()\r\n\u57df\u5bf9\u8c61            setAttribute()    getAttribute()     removeAttribute();\r\n<\/code><\/pre>\n\n\n\n<p>ServletContext \u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.P134; \/**\r\n * @author RichieZhang\r\n * @create 2022-12-05 \u4e0b\u5348 1:36\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 ContextServlet1 extends HttpServlet {\r\n    @Override\r\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n\r\n        \/*\r\n        \u4ec0\u4e48\u662f\u57df\u5bf9\u8c61?\r\n        \u57df\u5bf9\u8c61\uff0c\u662f\u53ef\u4ee5\u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e\u7684\u5bf9\u8c61\uff0c\u53eb\u57df\u5bf9\u8c61\u3002\r\n        \u8fd9\u91cc\u7684\u57df\u6307\u7684\u662f\u5b58\u53d6\u6570\u636e\u7684\u64cd\u4f5c\u8303\u56f4\uff0c\u6574\u4e2a web \u5de5\u7a0b\u3002\r\n\r\n                    \u5b58\u6570\u636e             \u53d6\u6570\u636e             \u5220\u9664 \u6570\u636e\r\n        Map         put()              get()              remove()\r\n        \u57df\u5bf9\u8c61      setAttribute()     getAttribute()     removeAttribute();\r\n         *\/\r\n\r\n        \/\/ \u83b7\u53d6ServletContext\u5bf9\u8c61\r\n        ServletContext context = getServletContext();\r\n        System.out.println(context);\r\n        System.out.println(\"\u4fdd\u5b58\u4e4b\u524d\uff1aContext1 \u83b7\u53d6key1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\r\n\r\n        context.setAttribute(\"key1\",\"value1\");\r\n\r\n        System.out.println(\"Context1 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\r\n        System.out.println(\"Context1 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\r\n        System.out.println(\"Context1 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\r\n        System.out.println(\"Context1 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\r\n        System.out.println(\"Context1 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\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>package top.qaqaq.P134; \/**\r\n * @author RichieZhang\r\n * @create 2022-12-05 \u4e0b\u5348 1:45\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 ContextServlet2 extends HttpServlet {\r\n    @Override\r\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\r\n        ServletContext context = getServletContext();\r\n        System.out.println(context);\r\n        System.out.println(\"Context2 \u4e2d\u83b7\u53d6\u57df\u6570\u636ekey1\u7684\u503c\u662f\uff1a\" + context.getAttribute(\"key1\"));\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>\r\n        &lt;servlet-name>ContextServlet1&lt;\/servlet-name>\r\n        &lt;servlet-class>top.qaqaq.P134.ContextServlet1&lt;\/servlet-class>\r\n    &lt;\/servlet>\r\n    &lt;servlet-mapping>\r\n        &lt;servlet-name>ContextServlet1&lt;\/servlet-name>\r\n        &lt;url-pattern>\/context1&lt;\/url-pattern>\r\n    &lt;\/servlet-mapping>\r\n    \r\n    &lt;servlet>\r\n        &lt;servlet-name>ContextServlet2&lt;\/servlet-name>\r\n        &lt;servlet-class>top.qaqaq.P134.ContextServlet2&lt;\/servlet-class>\r\n    &lt;\/servlet>\r\n    &lt;servlet-mapping>\r\n        &lt;servlet-name>ContextServlet2&lt;\/servlet-name>\r\n        &lt;url-pattern>\/context2&lt;\/url-pattern>\r\n    &lt;\/servlet-mapping><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4ec0\u4e48\u662f\u57df\u5bf9\u8c61?\u57df\u5bf9\u8c61\uff0c\u662f\u53ef\u4ee5\u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e\u7684\u5bf9\u8c61\uff0c\u53eb\u57df\u5bf9\u8c61\u3002\u8fd9\u91cc\u7684\u57df\u6307\u7684\u662f\u5b58\u53d6\u6570\u636e\u7684\u64cd\u4f5c\u8303\u56f4\uff0c\u6574\u4e2a  [&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-2168","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\/2168"}],"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=2168"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2168\/revisions"}],"predecessor-version":[{"id":2169,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2168\/revisions\/2169"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}