{"id":31635,"date":"2022-11-02T17:44:54","date_gmt":"2023-09-15T08:51:54","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%bc%9a%e8%af%9d%e8%8c%83%e5%9b%b4\/"},"modified":"2024-04-28T22:37:47","modified_gmt":"2024-04-28T14:37:47","slug":"java%e4%bc%9a%e8%af%9d%e8%8c%83%e5%9b%b4","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%bc%9a%e8%af%9d%e8%8c%83%e5%9b%b4\/","title":{"rendered":"Java\u4f1a\u8bdd\u8303\u56f4"},"content":{"rendered":"<p>\u6211\u6b63\u5728\u4ee5\u5a31\u4e50\u4e3a\u76ee\u7684\u5b66\u4e60\u7f16\u7a0b\u3002\u6211\u5f00\u59cb\u5b66\u4e60\u662f\u56e0\u4e3a\u6211\u60f3\u5236\u4f5c\u4e00\u4e2a\u53e4\u4e66\u9500\u552e\u7f51\u7ad9\uff0c\u4f46\u662f\u4e3a\u4e86\u5728\u670d\u52a1\u5668\u4e0a\u52a8\u6001\u751f\u6210\u7f51\u9875\u5e76\u8fdb\u884c\u6570\u636e\u5904\u7406\uff0c\u6211\u9700\u8981\u4e86\u89e3Java Servlet\uff08Java Servlet\uff09\u7684\u77e5\u8bc6&#8230;\uff08^^\uff1b\uff09\u4ee5\u53e4\u4e66\u7f51\u7ad9\u4e3a\u4f8b\uff0c\u6211\u53d1\u73b0\u5f88\u96be\u7406\u89e3\u987e\u5ba2\u653e\u5165\u8d2d\u7269\u8f66\u7684\u4fe1\u606f\u5982\u4f55\u4fdd\u6301\uff0c\u6240\u4ee5\u6211\u51b3\u5b9a\u5199\u4e00\u7bc7\u6587\u7ae0\u89e3\u91ca\u4e00\u4e0b\uff01\uff01\u30fe ^^\u266a<\/p>\n<p>\u30bb\u30c3\u30b7\u30e7\u30f3<\/p>\n<p>\u30e6\u30fc\u30b6\u30fc\u3054\u3068\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3059\u308b\u4ed5\u7d44\u307f<\/p>\n<p>\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3067\u306fjavax.servlet.http.HttpSession\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u4f7f\u3063\u3066\u6271\u3046<\/p>\n<pre class=\"post-pre\"><code><span class=\"kn\">package<\/span> <span class=\"nn\">session<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.io.IOException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">java.io.PrintWriter<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">javax.servlet.ServletException<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">javax.servlet.http.HttpServlet<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">javax.servlet.http.HttpServletRequest<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">javax.servlet.http.HttpServletResponse<\/span><span class=\"o\">;<\/span>\r\n<span class=\"kn\">import<\/span> <span class=\"nn\">javax.servlet.http.HttpSession<\/span><span class=\"o\">;<\/span>\r\n\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">CounterServlet<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">HttpServlet<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">doGet<\/span><span class=\"o\">(<\/span><span class=\"nc\">HttpServletRequest<\/span> <span class=\"n\">request<\/span><span class=\"o\">,<\/span><span class=\"nc\">HttpServletResponse<\/span> <span class=\"n\">response<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">ServletException<\/span><span class=\"o\">,<\/span><span class=\"nc\">IOException<\/span><span class=\"o\">{<\/span>\r\n\r\n        <span class=\"c1\">\/\/1.\u30bb\u30c3\u30b7\u30e7\u30f3\u306e\u53d6\u5f97<\/span>\r\n        <span class=\"nc\">HttpSession<\/span> <span class=\"n\">session<\/span> <span class=\"o\">=<\/span> <span class=\"n\">request<\/span><span class=\"o\">.<\/span><span class=\"na\">getSession<\/span><span class=\"o\">();<\/span>\r\n\r\n        <span class=\"c1\">\/\/2.\u30bb\u30c3\u30b7\u30e7\u30f3\u304b\u3089\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u53d6\u5f97<\/span>\r\n        <span class=\"nc\">Integer<\/span> <span class=\"n\">count<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Integer<\/span><span class=\"o\">)<\/span><span class=\"n\">session<\/span><span class=\"o\">.<\/span><span class=\"na\">getAttribute<\/span><span class=\"o\">(<\/span><span class=\"s\">\"count\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"c1\">\/\/3.\u30ab\u30a6\u30f3\u30bf\u3092+1<\/span>\r\n        <span class=\"k\">if<\/span><span class=\"o\">(<\/span><span class=\"n\">count<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span><span class=\"o\">){<\/span>\r\n            <span class=\"n\">count<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">(<\/span><span class=\"mi\">0<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"n\">count<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">(<\/span><span class=\"n\">count<\/span><span class=\"o\">.<\/span><span class=\"na\">intValue<\/span><span class=\"o\">()<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"c1\">\/\/4.\u30bb\u30c3\u30b7\u30e7\u30f3\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d<\/span>\r\n        <span class=\"n\">session<\/span><span class=\"o\">.<\/span><span class=\"na\">setAttribute<\/span><span class=\"o\">(<\/span><span class=\"s\">\"count\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">count<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"n\">response<\/span><span class=\"o\">.<\/span><span class=\"na\">setContentType<\/span><span class=\"o\">(<\/span><span class=\"s\">\"text\/html\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"nc\">PrintWriter<\/span> <span class=\"n\">out<\/span> <span class=\"o\">=<\/span> <span class=\"n\">response<\/span><span class=\"o\">.<\/span><span class=\"na\">getWriter<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"&lt;html&gt;&lt;body&gt;\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"c1\">\/\/\u30bb\u30c3\u30b7\u30e7\u30f3ID\u306e\u8868\u793a<\/span>\r\n        <span class=\"n\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"&lt;p&gt;sessionId=\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">session<\/span><span class=\"o\">.<\/span><span class=\"na\">getId<\/span><span class=\"o\">());<\/span>\r\n\r\n        <span class=\"c1\">\/\/\u30bb\u30c3\u30b7\u30e7\u30f3ID\u306e\u8868\u793a<\/span>\r\n        <span class=\"n\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">print<\/span><span class=\"o\">(<\/span><span class=\"s\">\"&lt;p&gt;count=\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">count<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"c1\">\/\/\u3053\u306e\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3078\u306e\u30ea\u30f3\u30af\u306e\u8868\u793a<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">linkurl<\/span> <span class=\"o\">=<\/span> <span class=\"n\">request<\/span><span class=\"o\">.<\/span><span class=\"na\">getRequestURI<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"n\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"&lt;p&gt;&lt;a href=\\\"\"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">linkurl<\/span> <span class=\"o\">+<\/span> <span class=\"s\">\"\\\"&gt;RELOAD&lt;\/a&gt;\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"&lt;\/body&gt;&lt;\/html&gt;\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5f53\u521b\u5efaHttpSession\u5bf9\u8c61\u65f6\uff0c\u5e94\u7528\u7a0b\u5e8f\u670d\u52a1\u5668\u4f1a\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26\u201c\u4f1a\u8bddID\u201d\u3002\u4f1a\u8bdd\u7684\u4e00\u81f4\u6027\u4f3c\u4e4e\u662f\u7531\u8be5\u4f1a\u8bddID\u8fdb\u884c\u4fdd\u8bc1\u7684\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6211\u4eec\u4ece\u4f1a\u8bdd\u5c5e\u6027\u4e2d\u83b7\u53d6\u540d\u4e3a&#8221;count&#8221;\u7684\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u8f6c\u6362\u4e3aInteger\u7c7b\u578b\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7531\u4e8e\u5728\u6700\u521d\u7684\u8bf7\u6c42\u4e2d\uff0c\u4f1a\u8bdd\u5c5e\u6027\u4e2d\u6ca1\u6709\u540d\u4e3acount\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5count\u7684\u503c\u4e3anull\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u8fdb\u884c\u8ba1\u6570\u589e\u52a0\u64cd\u4f5c<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u7531\u4e8e\u6700\u521d\u9636\u6bb5\u4e3anull\uff0c\u6240\u4ee5\u5c06\u5176\u8d4b\u503c\u4e3a0\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\u4f7f\u7528setAttribute\u65b9\u6cd5\uff0c\u5728\u52a01\u540e\u7684\u503c\u5c06\u88ab\u6ce8\u518c\u5230\u4f1a\u8bdd\u5c5e\u6027\u4e2d\u3002<\/ol>\n<p>\u5728\u4f1a\u8bdd\u8303\u56f4\u4e2d\u4f20\u9012\u6570\u636e<br \/>\n\u5728\u8bf7\u6c42\u8303\u56f4\u6ce8\u518c\u7684\u6570\u636e\u65e0\u6cd5\u8de8\u8bf7\u6c42\u4f20\u9012\uff0c\u4f46\u662f\u5728\u4f1a\u8bdd\u8303\u56f4\u6ce8\u518c\u7684\u6570\u636e\u53ef\u4ee5\u8fdb\u884c\u4f20\u9012\u3002<\/p>\n<p>request\u30b9\u30b3\u30fc\u30d7<\/p>\n<p>1\u56de\u306eHTTP\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u5b9f\u884c\u3055\u308c\u308b\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3068forward\u3055\u308c\u305fJSP\u9593\u3067\u6709\u52b9\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<br \/>\n\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u51e6\u7406\u304c\u7d42\u308f\u308b\u3068\u7834\u68c4<\/p>\n<p>HttpServletRequest\u5c5e\u6027\u3068\u3057\u3066\u8a2d\u5b9a<\/p>\n<p>session\u30b9\u30b3\u30fc\u30d7<\/p>\n<p>\u540c\u4e00\u306e\u30bb\u30c3\u30b7\u30e7\u30f3\u3067\u5b9f\u884c\u3055\u308c\u308b\u3001\u30b5\u30fc\u30d6\u30ec\u30c3\u30c8\u3084JSP\u3067\u6709\u52b9\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<br \/>\n\u4e00\u5b9a\u6642\u9593\u7d4c\u904e\u3067session\u7d42\u4e86\u3068\u3082\u306b\u7834\u68c4<br \/>\nHttpSession\u306e\u5c5e\u6027\u3068\u3057\u3066\u8a2d\u5b9a<\/p>\n<pre class=\"post-pre\"><code>\u30bb\u30c3\u30b7\u30e7\u30f3\u30b9\u30b3\u30fc\u30d7\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u64cd\u4f5c\u3059\u308b\u30e1\u30bd\u30c3\u30c9\r\n\r\nObject getAttribute(java.lang.String name)\r\n\u5f15\u6570\u3067\u6307\u5b9a\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u306fnull\u3092\u8fd4\u3057\u307e\u3059\u3002\r\n\u8fd4\u3063\u3066\u304f\u308b\u578b\u306fObject\u578b\u3067\u3059\u306e\u3067\u3001\u9069\u5207\u306b\u30ad\u30e3\u30b9\u30c8\u3057\u3066\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3088\u3046\u3067\u3059\u3002\r\n\r\nvoid setAttribute(java.lang.String name, java.lang.Object value)\r\n\u5f15\u6570value\u3067\u6307\u5b9a\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092name\u3068\u3044\u3046\u540d\u524d\u3067\u767b\u9332\u3057\u307e\u3059\u3002\r\n\r\nvoid removeAttribute(java.lang.String name)\r\n\u5f15\u6570name\u3067\u6307\u5b9a\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u524a\u9664\u3057\u307e\u3059\u3002\r\n\r\njava.util.Enumeration getAttributeNames()\r\n\u767b\u9332\u3055\u308c\u3066\u3044\u308bname\u306e\u4e00\u89a7\u3092\u8fd4\u3057\u307e\u3059\u3002\r\n<\/code><\/pre>\n<p>\u4f1a\u8bdd\u8d85\u65f6<br \/>\n\u5982\u679c\u4e0d\u5220\u9664\u4f1a\u8bdd\u6570\u636e\uff0c\u672a\u4f7f\u7528\u7684\u6570\u636e\u5c06\u5728\u670d\u52a1\u5668\u4e0a\u6b8b\u7559\u3002<br \/>\n\u4f5c\u4e3a\u4e00\u79cd\u907f\u514d\u65b9\u6cd5\uff0c\u5e94\u7528\u670d\u52a1\u5668\u5185\u7f6e\u4e86\u6839\u636e\u5ba2\u6237\u7aef\u6700\u540e\u8bbf\u95ee\u65f6\u95f4\u68c0\u67e5\u5e76\u5220\u9664\u6570\u636e\u7684\u673a\u5236\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nt\">&lt;session-config&gt;<\/span>\r\n        <span class=\"nt\">&lt;session-timeout&gt;<\/span>3<span class=\"nt\">&lt;\/session-timeout&gt;<\/span>\r\n<span class=\"nt\">&lt;\/session-config&gt;<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6211\u6b63\u5728\u4ee5\u5a31\u4e50\u4e3a\u76ee\u7684\u5b66\u4e60\u7f16\u7a0b\u3002\u6211\u5f00\u59cb\u5b66\u4e60\u662f\u56e0\u4e3a\u6211\u60f3\u5236\u4f5c\u4e00\u4e2a\u53e4\u4e66\u9500\u552e\u7f51\u7ad9\uff0c\u4f46\u662f\u4e3a\u4e86\u5728\u670d\u52a1\u5668\u4e0a\u52a8\u6001\u751f\u6210\u7f51\u9875\u5e76\u8fdb\u884c\u6570\u636e [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31635","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java\u4f1a\u8bdd\u8303\u56f4 - Blog - Silicon Cloud<\/title>\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\/zh\/blog\/java\u4f1a\u8bdd\u8303\u56f4\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u4f1a\u8bdd\u8303\u56f4\" \/>\n<meta property=\"og:description\" content=\"\u6211\u6b63\u5728\u4ee5\u5a31\u4e50\u4e3a\u76ee\u7684\u5b66\u4e60\u7f16\u7a0b\u3002\u6211\u5f00\u59cb\u5b66\u4e60\u662f\u56e0\u4e3a\u6211\u60f3\u5236\u4f5c\u4e00\u4e2a\u53e4\u4e66\u9500\u552e\u7f51\u7ad9\uff0c\u4f46\u662f\u4e3a\u4e86\u5728\u670d\u52a1\u5668\u4e0a\u52a8\u6001\u751f\u6210\u7f51\u9875\u5e76\u8fdb\u884c\u6570\u636e [&hellip;]\" \/>\n<meta property=\"og:url\" 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