{"id":2226,"date":"2022-12-07T21:48:41","date_gmt":"2022-12-07T13:48:41","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2226"},"modified":"2023-01-05T18:05:28","modified_gmt":"2023-01-05T10:05:28","slug":"jsp-%e4%bb%80%e4%b9%88%e6%98%afjsp%ef%bc%8c%e4%bb%a5%e5%8f%8a%e5%ae%83%e6%9c%89%e4%bb%80%e4%b9%88%e4%bd%9c%e7%94%a8%e3%80%81jsp-jsp%e7%9a%84%e5%b0%8f%e7%bb%93%e3%80%81jsp-jsp%e9%a1%b5%e9%9d%a2-2","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2226","title":{"rendered":"jsp-\u4ec0\u4e48\u662fjsp\uff0c\u4ee5\u53ca\u5b83\u6709\u4ec0\u4e48\u4f5c\u7528\u3001jsp\u7684\u5c0f\u7ed3\u3001jsp\u9875\u9762\u7684\u672c\u8d28\u3001jsp\u7684page\u6307\u4ee4\u3001\u58f0\u660e\u811a\u672c\u3001\u8868\u8fbe\u5f0f\u811a\u672c\u3001\u4ee3\u7801\u811a\u672c\u3001jsp\u4e2d\u7684\u4e09\u79cd\u6ce8\u91ca\u3001jsp\u4e2d\u7684\u4e5d\u5927\u5185\u7f6e\u5bf9\u8c61\u3001\u56db\u4e2a\u57df\u5bf9\u8c61\u7684\u6f14\u793a\u3001out\u548cresponse\u8f93\u51fa\u7684\u533a\u522b\u3001\u5e38\u7528\u6807\u7b7e \u4e4b \u9759\u6001\u5305\u542b\u3001\u5e38\u7528\u6807\u7b7e \u4e4b \u52a8\u6001\u5305\u542b\u3001\u5e38\u7528\u6807\u7b7e \u4e4b \u8bf7\u6c42\u8f6c\u53d1\u3001\u7ec3\u4e60\u4e00\uff1a\u4e5d\u4e5d\u4e58\u6cd5\u53e3\u8bc0\u8868\u3001\u7ec3\u4e60\u4e8c\uff1a\u904d\u5386\u8f93\u51fa10\u4e2a\u5b66\u751f\u4fe1\u606f\u5230\u8868\u683c\u4e2d\u3001\u8bf7\u6c42\u8f6c\u53d1\u7684\u4f7f\u7528\u8bf4\u660e\u3001\u4ec0\u4e48\u662fListener\u76d1\u542c\u5668\u3001ServletContextListener\u76d1\u542c\u5668\u6f14\u793a"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">08-jsp<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u4ec0\u4e48\u662f jsp\uff0c\u5b83\u6709\u4ec0\u4e48\u7528?<\/h2>\n\n\n\n<p>jsp \u7684\u5168\u79f0\u662f java server pages\u3002Java \u7684\u670d\u52a1\u5668\u9875\u9762\u3002<br>jsp \u7684\u4e3b\u8981\u4f5c\u7528\u662f\u4ee3\u66ff Servlet \u7a0b\u5e8f\u56de\u4f20 html \u9875\u9762\u7684\u6570\u636e\u3002<br>\u56e0\u4e3a Servlet \u7a0b\u5e8f\u56de\u4f20 html \u9875\u9762\u6570\u636e\u662f\u4e00\u4ef6\u975e\u5e38\u7e41\u9501\u7684\u4e8b\u60c5\u3002\u5f00\u53d1\u6210\u672c\u548c\u7ef4\u62a4\u6210\u672c\u90fd\u6781\u9ad8\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Servlet \u56de\u4f20 html \u9875\u9762\u6570\u636e\u7684\u4ee3\u7801\uff1a\n\npublic class PringHtml extends HttpServlet {\n@Override\nprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,\nIOException {\n\/\/ \u901a\u8fc7\u54cd\u5e94\u7684\u56de\u4f20\u6d41\u56de\u4f20 html \u9875\u9762\u6570\u636e\nresp.setContentType(\"text\/html; charset=UTF-8\");\nPrintWriter writer = resp.getWriter();\nwriter.write(\"&lt;!DOCTYPE html&gt;\\r\\n\");\nwriter.write(\" &lt;html lang=\\\"en\\\"&gt;\\r\\n\");\nwriter.write(\" &lt;head&gt;\\r\\n\");\nwriter.write(\" &lt;meta charset=\\\"UTF-8\\\"&gt;\\r\\n\");\nwriter.write(\" &lt;title&gt;Title&lt;\/title&gt;\\r\\n\");\nwriter.write(\" &lt;\/head&gt;\\r\\n\");\nwriter.write(\" &lt;body&gt;\\r\\n\");\nwriter.write(\" \u8fd9\u662f html \u9875\u9762\u6570\u636e \\r\\n\");\nwriter.write(\" &lt;\/body&gt;\\r\\n\");\nwriter.write(\"&lt;\/html&gt;\\r\\n\");\nwriter.write(\"\\r\\n\");\n}\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>jsp \u56de\u4f20\u4e00\u4e2a\u7b80\u5355 html \u9875\u9762\u7684\u4ee3\u7801\uff1a\n\n&lt;%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %&gt;\n&lt;html&gt;\n&lt;head&gt;\n&lt;title&gt;Title&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n\u8fd9\u662f html \u9875\u9762\u6570\u636e&lt;\/body&gt;&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p>jsp \u7684\u5c0f\u7ed3\uff1a<br>1\u3001\u5982\u4f55\u521b\u5efa jsp \u7684\u9875\u9762?<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-101.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"825\" height=\"267\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-101.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2227\"  sizes=\"(max-width: 825px) 100vw, 825px\" \/><\/div><\/figure>\n\n\n\n<p>\u8f93\u5165\u6587\u4ef6\u540d\u6572\u56de\u8f66\u5373\u53ef\uff01\uff01<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-102.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"268\" height=\"130\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-102.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2228\"\/><\/div><\/figure>\n\n\n\n<p>2\u3001jsp \u5982\u4f55\u8bbf\u95ee\uff1a<br>jsp \u9875\u9762\u548c html \u9875\u9762\u4e00\u6837\uff0c\u90fd\u662f\u5b58\u653e\u5728 web \u76ee\u5f55\u4e0b\u3002\u8bbf\u95ee\u4e5f\u8ddf\u8bbf\u95ee html \u9875\u9762\u4e00\u6837\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6bd4\u5982\uff1a\n\u5728 web \u76ee\u5f55\u4e0b\u6709\u5982\u4e0b\u7684\u6587\u4ef6\uff1a\nweb \u76ee\u5f55\na.html \u9875\u9762 \u8bbf\u95ee\u5730\u5740\u662f =======&gt;&gt;&gt;&gt;&gt;&gt; http:\/\/ip:port\/\u5de5\u7a0b\u8def\u5f84\/a.html\nb.jsp \u9875\u9762\u8bbf\u95ee\u5730\u5740\u662f =======&gt;&gt;&gt;&gt;&gt;&gt; http:\/\/ip:port\/\u5de5\u7a0b\u8def\u5f84\/b.jsp<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.jsp \u7684\u672c\u8d28\u662f\u4ec0\u4e48\u3002<\/h2>\n\n\n\n<p>jsp \u9875\u9762\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a Servlet \u7a0b\u5e8f\u3002<\/p>\n\n\n\n<p><br>\u5f53\u6211\u4eec\u7b2c\u4e00\u6b21\u8bbf\u95ee jsp \u9875\u9762\u7684\u65f6\u5019\u3002Tomcat \u670d\u52a1\u5668\u4f1a\u5e2e\u6211\u4eec\u628a jsp \u9875\u9762\u7ffb\u8bd1\u6210\u4e3a\u4e00\u4e2a java \u6e90\u6587\u4ef6\u3002\u5e76\u4e14\u5bf9\u5b83\u8fdb\u884c\u7f16\u8bd1\u6210\u4e3a.class \u5b57\u8282\u7801\u7a0b\u5e8f\u3002\u6211\u4eec\u6253\u5f00 java \u6e90\u6587\u4ef6\u4e0d\u96be\u53d1\u73b0\u5176\u91cc\u9762\u7684\u5185\u5bb9\u662f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-103.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"689\" height=\"279\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-103.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2229\"  sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/div><\/figure>\n\n\n\n<p>\u6211\u4eec\u8ddf\u8e2a\u539f\u4ee3\u7801\u53d1\u73b0\uff0cHttpJspBase \u7c7b\u3002\u5b83\u76f4\u63a5\u5730\u7ee7\u627f\u4e86 HttpServlet \u7c7b\u3002\u4e5f\u5c31\u662f\u8bf4\u3002jsp \u7ffb\u8bd1\u51fa\u6765\u7684 java \u7c7b\uff0c\u5b83\u95f4\u63a5\u4e86\u7ee7\u627f\u4e86 HttpServlet \u7c7b\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u7ffb\u8bd1\u51fa\u6765\u7684\u662f\u4e00\u4e2a Servlet \u7a0b\u5e8f<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-104.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"882\" height=\"251\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-104.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2230\"  sizes=\"(max-width: 882px) 100vw, 882px\" \/><\/div><\/figure>\n\n\n\n<p>\u603b\u7ed3\uff1a\u901a\u8fc7\u7ffb\u8bd1\u7684 java \u6e90\u4ee3\u7801\u6211\u4eec\u5c31\u53ef\u4ee5\u5f97\u5230\u7ed3\u679c\uff1ajsp \u5c31\u662f Servlet \u7a0b\u5e8f\u3002<\/p>\n\n\n\n<p><br>\u5927\u5bb6\u4e5f\u53ef\u4ee5\u53bb\u89c2\u5bdf\u7ffb\u8bd1\u51fa\u6765\u7684 Servlet \u7a0b\u5e8f\u7684\u6e90\u4ee3\u7801\uff0c\u4e0d\u96be\u53d1\u73b0\u3002\u5176\u5e95\u5c42\u5b9e\u73b0\uff0c\u4e5f\u662f\u901a\u8fc7\u8f93\u51fa\u6d41\u3002\u628a html \u9875\u9762\u6570\u636e\u56de\u4f20\u7ed9\u5ba2\u6237\u7aef\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public void _jspService(final javax.servlet.http.HttpServletRequest request, final\njavax.servlet.http.HttpServletResponse response)\nthrows java.io.IOException, javax.servlet.ServletException {\nfinal java.lang.String _jspx_method = request.getMethod();\nif (!\"GET\".equals(_jspx_method) &amp;&amp; !\"POST\".equals(_jspx_method) &amp;&amp; !\"HEAD\".equals(_jspx_method)\n&amp;&amp; !javax.servlet.DispatcherType.ERROR.equals(request.getDispatcherType())) {\nresponse.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, \"JSPs only permit GET POST or\nHEAD\");\nreturn;\n}\nfinal javax.servlet.jsp.PageContext pageContext;\njavax.servlet.http.HttpSession session = null;\nfinal javax.servlet.ServletContext application;\nfinal javax.servlet.ServletConfig config;\njavax.servlet.jsp.JspWriter out = null;\nfinal java.lang.Object page = this;\njavax.servlet.jsp.JspWriter _jspx_out = null;\njavax.servlet.jsp.PageContext _jspx_page_context = null;\ntry {\nresponse.setContentType(\"text\/html;charset=UTF-8\");\npageContext = _jspxFactory.getPageContext(this, request, response,\nnull, true, 8192, true);\n_jspx_page_context = pageContext;\napplication = pageContext.getServletContext();\nconfig = pageContext.getServletConfig();\nsession = pageContext.getSession();\nout = pageContext.getOut();\n_jspx_out = out;\nout.write(\"\\r\\n\");\nout.write(\"\\r\\n\");\nout.write(\"&lt;html&gt;\\r\\n\");\nout.write(\"&lt;head&gt;\\r\\n\");\nout.write(\" &lt;title&gt;Title&lt;\/title&gt;\\r\\n\");\nout.write(\"&lt;\/head&gt;\\r\\n\");\nout.write(\"&lt;body&gt;\\r\\n\");\nout.write(\" a.jsp \u9875\u9762\\r\\n\");\nout.write(\"&lt;\/body&gt;\\r\\n\");\nout.write(\"&lt;\/html&gt;\\r\\n\");\n} catch (java.lang.Throwable t) {\nif (!(t instanceof javax.servlet.jsp.SkipPageException)){\nout = _jspx_out;\nif (out != null &amp;&amp; out.getBufferSize() != 0)\ntry {\nif (response.isCommitted()) {\nout.flush();\n} else {\nout.clearBuffer();\n}\n} catch (java.io.IOException e) {}\nif (_jspx_page_context != null) _jspx_page_context.handlePageException(t);\nelse throw new ServletException(t);\n}\n} finally {\n_jspxFactory.releasePageContext(_jspx_page_context);\n}\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.jsp \u7684\u4e09\u79cd\u8bed\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">a)jsp \u5934\u90e8\u7684 page \u6307\u4ee4<\/h3>\n\n\n\n<p>jsp \u7684 page \u6307\u4ee4\u53ef\u4ee5\u4fee\u6539 jsp \u9875\u9762\u4e2d\u4e00\u4e9b\u91cd\u8981\u7684\u5c5e\u6027\uff0c\u6216\u8005\u884c\u4e3a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>i. language \u5c5e\u6027\n\u8868\u793a jsp \u7ffb\u8bd1\u540e\u662f\u4ec0\u4e48\u8bed\u8a00\u6587\u4ef6\u3002\u6682\u65f6\u53ea\u652f\u6301 java\u3002\nii. contentType \u5c5e\u6027\n\u8868\u793a jsp \u8fd4\u56de\u7684\u6570\u636e\u7c7b\u578b\u662f\u4ec0\u4e48\u3002\u4e5f\u662f\u6e90\u7801\u4e2d response.setContentType()\u53c2\u6570\u503c\niii. pageEncoding \u5c5e\u6027 \n\u8868\u793a\u5f53\u524d jsp \u9875\u9762\u6587\u4ef6\u672c\u8eab\u7684\u5b57\u7b26\u96c6\u3002\niv. import \u5c5e\u6027\n\u8ddf java \u6e90\u4ee3\u7801\u4e2d\u4e00\u6837\u3002\u7528\u4e8e\u5bfc\u5305\uff0c\u5bfc\u7c7b\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>========================\u4e24\u4e2a\u5c5e\u6027\u662f\u7ed9 out \u8f93\u51fa\u6d41\u4f7f\u7528=============================\nv. autoFlush \u5c5e\u6027\n\u8bbe\u7f6e\u5f53 out \u8f93\u51fa\u6d41\u7f13\u51b2\u533a\u6ee1\u4e86\u4e4b\u540e\uff0c\u662f\u5426\u81ea\u52a8\u5237\u65b0\u51b2\u7ea7\u533a\u3002\u9ed8\u8ba4\u503c\u662f true\u3002\nvi. buffer \u5c5e\u6027\n\u8bbe\u7f6e out \u7f13\u51b2\u533a\u7684\u5927\u5c0f\u3002\u9ed8\u8ba4\u662f 8kb<\/code><\/pre>\n\n\n\n<p>\u7f13\u51b2\u533a\u6ea2\u51fa\u9519\u8bef\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-105.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"629\" height=\"223\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-105.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2231\"  sizes=\"(max-width: 629px) 100vw, 629px\" \/><\/div><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>vii. errorPage \u5c5e\u6027\n\u8bbe\u7f6e\u5f53 jsp \u9875\u9762\u8fd0\u884c\u65f6\u51fa\u9519\uff0c\u81ea\u52a8\u8df3\u8f6c\u53bb\u7684\u9519\u8bef\u9875\u9762\u8def\u5f84\u3002\n\n&lt;!--\nerrorPage \u8868\u793a\u9519\u8bef\u540e\u81ea\u52a8\u8df3\u8f6c\u53bb\u7684\u8def\u5f84 &lt;br\/&gt;\n\u8fd9\u4e2a\u8def\u5f84\u4e00\u822c\u90fd\u662f\u4ee5\u659c\u6760\u6253\u5934\uff0c\u5b83\u8868\u793a\u8bf7\u6c42\u5730\u5740\u4e3a http:\/\/ip:port\/\u5de5\u7a0b\u8def\u5f84\/\n\u6620\u5c04\u5230\u4ee3\u7801\u7684 Web \u76ee\u5f55\n--&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>viii. isErrorPage \u5c5e\u6027 \n\u8bbe\u7f6e\u5f53\u524d jsp \u9875\u9762\u662f\u5426\u662f\u9519\u8bef\u4fe1\u606f\u9875\u9762\u3002\u9ed8\u8ba4\u662f false\u3002\u5982\u679c\u662f true \u53ef\u4ee5\n\u83b7\u53d6\u5f02\u5e38\u4fe1\u606f\u3002\nix. session \u5c5e\u6027\n\u8bbe\u7f6e\u8bbf\u95ee\u5f53\u524d jsp \u9875\u9762\uff0c\u662f\u5426\u4f1a\u521b\u5efa HttpSession \u5bf9\u8c61\u3002\u9ed8\u8ba4\u662f true\u3002\nx. extends \u5c5e\u6027\n\u8bbe\u7f6e jsp \u7ffb\u8bd1\u51fa\u6765\u7684 java \u7c7b\u9ed8\u8ba4\u7ee7\u627f\u8c01\u3002<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">b)jsp \u4e2d\u7684\u5e38\u7528\u811a\u672c<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>i. \u58f0\u660e\u811a\u672c(\u6781\u5c11\u4f7f\u7528)\n\u58f0\u660e\u811a\u672c\u7684\u683c\u5f0f\u662f\uff1a &lt;%! \u58f0\u660e java \u4ee3\u7801 %&gt;\n\u4f5c\u7528\uff1a\u53ef\u4ee5\u7ed9 jsp \u7ffb\u8bd1\u51fa\u6765\u7684 java \u7c7b\u5b9a\u4e49\u5c5e\u6027\u548c\u65b9\u6cd5\u751a\u81f3\u662f\u9759\u6001\u4ee3\u7801\u5757\u3002\u5185\u90e8\u7c7b\u7b49\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4ee3\u7801\u793a\u4f8b\uff1a\n\n&lt;%--1\u3001\u58f0\u660e\u7c7b\u5c5e\u6027--%&gt;\n&lt;%!\nprivate Integer id;\nprivate String name;\nprivate static Map&lt;String,Object&gt; map;\n%&gt;\n&lt;%--2\u3001\u58f0\u660e static \u9759\u6001\u4ee3\u7801\u5757--%&gt;\n&lt;%!\nstatic {\nmap = new HashMap&lt;String,Object&gt;();\nmap.put(\"key1\", \"value1\");\nmap.put(\"key2\", \"value2\");\nmap.put(\"key3\", \"value3\");\n}\n%&gt;\n&lt;%--3\u3001\u58f0\u660e\u7c7b\u65b9\u6cd5--%&gt;\n&lt;%!\npublic int abc(){\nreturn 12;\n}\n%&gt;\n&lt;%--4\u3001\u58f0\u660e\u5185\u90e8\u7c7b--%&gt;\n&lt;%!\npublic static class A {\nprivate Integer id = 12;\nprivate String abc = \"abc\";\n}\n%&gt;<\/code><\/pre>\n\n\n\n<p>\u58f0\u660e\u811a\u672c\u4ee3\u7801\u7ffb\u8bd1\u5bf9\u7167\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-106-1024x502.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"502\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-106-1024x502.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2232\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>ii. \u8868\u8fbe\u5f0f\u811a\u672c\uff08\u5e38\u7528\uff09\n\n\u8868\u8fbe\u5f0f\u811a\u672c\u7684\u683c\u5f0f\u662f\uff1a&lt;%=\u8868\u8fbe\u5f0f%&gt;\n\u8868\u8fbe\u5f0f\u811a\u672c\u7684\u4f5c\u7528\u662f\uff1a\u7684 jsp \u9875\u9762\u4e0a\u8f93\u51fa\u6570\u636e\u3002\n\n\u8868\u8fbe\u5f0f\u811a\u672c\u7684\u7279\u70b9\uff1a\n1\u3001\u6240\u6709\u7684\u8868\u8fbe\u5f0f\u811a\u672c\u90fd\u4f1a\u88ab\u7ffb\u8bd1\u5230_jspService() \u65b9\u6cd5\u4e2d\n2\u3001\u8868\u8fbe\u5f0f\u811a\u672c\u90fd\u4f1a\u88ab\u7ffb\u8bd1\u6210\u4e3a out.print()\u8f93\u51fa\u5230\u9875\u9762\u4e0a\n3\u3001\u7531\u4e8e\u8868\u8fbe\u5f0f\u811a\u672c\u7ffb\u8bd1\u7684\u5185\u5bb9\u90fd\u5728_jspService() \u65b9\u6cd5\u4e2d,\u6240\u4ee5_jspService()\u65b9\u6cd5\u4e2d\u7684\u5bf9\u8c61\u90fd\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002\n4\u3001\u8868\u8fbe\u5f0f\u811a\u672c\u4e2d\u7684\u8868\u8fbe\u5f0f\u4e0d\u80fd\u4ee5\u5206\u53f7\u7ed3\u675f\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u793a\u4f8b\u4ee3\u7801\uff1a\n\n&lt;%=12 %&gt; &lt;br&gt;\n&lt;%=12.12 %&gt; &lt;br&gt;\n&lt;%=\"\u6211\u662f\u5b57\u7b26\u4e32\" %&gt; &lt;br&gt;\n&lt;%=map%&gt; &lt;br&gt;\n&lt;%=request.getParameter(\"username\")%&gt;<\/code><\/pre>\n\n\n\n<p>\u7ffb\u8bd1\u5bf9\u7167\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-107-1024x292.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"292\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-107-1024x292.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2233\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<pre class=\"wp-block-code\"><code>iii. \u4ee3\u7801\u811a\u672c\n\n\u4ee3\u7801\u811a\u672c\u7684\u683c\u5f0f\u662f\uff1a\n&lt;%\njava \u8bed\u53e5%&gt;\n\u4ee3\u7801\u811a\u672c\u7684\u4f5c\u7528\u662f\uff1a\u53ef\u4ee5\u5728 jsp \u9875\u9762\u4e2d\uff0c\u7f16\u5199\u6211\u4eec\u81ea\u5df1\u9700\u8981\u7684\u529f\u80fd\uff08\u5199\u7684\u662f java \u8bed\u53e5\uff09\u3002\n\n\u4ee3\u7801\u811a\u672c\u7684\u7279\u70b9\u662f\uff1a\n1\u3001\u4ee3\u7801\u811a\u672c\u7ffb\u8bd1\u4e4b\u540e\u90fd\u5728_jspService \u65b9\u6cd5\u4e2d\n2\u3001\u4ee3\u7801\u811a\u672c\u7531\u4e8e\u7ffb\u8bd1\u5230_jspService()\u65b9\u6cd5\u4e2d\uff0c\u6240\u4ee5\u5728_jspService()\u65b9\u6cd5\u4e2d\u7684\u73b0\u6709\u5bf9\u8c61\u90fd\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002\n3\u3001\u8fd8\u53ef\u4ee5\u7531\u591a\u4e2a\u4ee3\u7801\u811a\u672c\u5757\u7ec4\u5408\u5b8c\u6210\u4e00\u4e2a\u5b8c\u6574\u7684 java \u8bed\u53e5\u3002\n4\u3001\u4ee3\u7801\u811a\u672c\u8fd8\u53ef\u4ee5\u548c\u8868\u8fbe\u5f0f\u811a\u672c\u4e00\u8d77\u7ec4\u5408\u4f7f\u7528\uff0c\u5728 jsp \u9875\u9762\u4e0a\u8f93\u51fa\u6570\u636e<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u793a\u4f8b\u4ee3\u7801\uff1a\n\n&lt;%--\u7ec3\u4e60\uff1a--%&gt;\n&lt;%--1.\u4ee3\u7801\u811a\u672c----if \u8bed\u53e5--%&gt;\n&lt;%\nint i = 13 ;\nif (i == 12) {\n%&gt;\n&lt;h1&gt;\u56fd\u54e5\u597d\u5e05&lt;\/h1&gt;\n&lt;%\n} else {\n%&gt;\n&lt;h1&gt;\u56fd\u54e5\u53c8\u9a97\u4eba\u4e86\uff01&lt;\/h1&gt;&lt;%\n}\n%&gt;\n&lt;br&gt;\n&lt;%--2.\u4ee3\u7801\u811a\u672c----for \u5faa\u73af\u8bed\u53e5--%&gt;\n&lt;table border=\"1\" cellspacing=\"0\"&gt;\n&lt;%\nfor (int j = 0; j &lt; 10; j++) {\n%&gt;\n&lt;tr&gt;\n&lt;td&gt;\u7b2c &lt;%=j + 1%&gt;\u884c&lt;\/td&gt;&lt;\/tr&gt;\n&lt;%\n}\n%&gt;\n&lt;\/table&gt;\n&lt;%--3.\u7ffb\u8bd1\u540e java \u6587\u4ef6\u4e2d_jspService \u65b9\u6cd5\u5185\u7684\u4ee3\u7801\u90fd\u53ef\u4ee5\u5199--%&gt;\n&lt;%\nString username = request.getParameter(\"username\");\nSystem.out.println(\"\u7528\u6237\u540d\u7684\u8bf7\u6c42\u53c2\u6570\u503c\u662f\uff1a\" + username);%&gt;<\/code><\/pre>\n\n\n\n<p>\u7ffb\u8bd1\u4e4b\u540e\u7684\u5bf9\u6bd4\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-108-1024x275.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"275\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-108-1024x275.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2234\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">c)jsp \u4e2d\u7684\u4e09\u79cd\u6ce8\u91ca<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>i. html \u6ce8\u91ca\n\n&lt;!-- \u8fd9\u662f html \u6ce8\u91ca --&gt;\nhtml \u6ce8\u91ca\u4f1a\u88ab\u7ffb\u8bd1\u5230 java \u6e90\u4ee3\u7801\u4e2d\u3002\u5728_jspService \u65b9\u6cd5\u91cc\uff0c\u4ee5 out.writer \u8f93\u51fa\u5230\u5ba2\u6237\u7aef\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>ii. java \u6ce8\u91ca\n\n\/\/ \u5355\u884c java \u6ce8\u91ca\n\/* \u591a\u884c java \u6ce8\u91ca *\/\n\njava \u6ce8\u91ca\u4f1a\u88ab\u7ffb\u8bd1\u5230 java \u6e90\u4ee3\u7801\u4e2d\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>iii. jsp \u6ce8\u91ca\n&lt;%-- \u8fd9\u662f jsp \u6ce8\u91ca --%&gt;\njsp \u6ce8\u91ca\u53ef\u4ee5\u6ce8\u6389\uff0cjsp \u9875\u9762\u4e2d\u6240\u6709\u4ee3\u7801\u3002<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4.jsp \u4e5d\u5927\u5185\u7f6e\u5bf9\u8c61<\/h2>\n\n\n\n<p>jsp \u4e2d\u7684\u5185\u7f6e\u5bf9\u8c61\uff0c\u662f\u6307 Tomcat \u5728\u7ffb\u8bd1 jsp \u9875\u9762\u6210\u4e3a Servlet \u6e90\u4ee3\u7801\u540e\uff0c\u5185\u90e8\u63d0\u4f9b\u7684\u4e5d\u5927\u5bf9\u8c61\uff0c\u53eb\u5185\u7f6e\u5bf9\u8c61\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-109-1024x443.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"443\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-109-1024x443.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2235\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">5.jsp \u56db\u5927\u57df\u5bf9\u8c61<\/h2>\n\n\n\n<p>\u56db\u4e2a\u57df\u5bf9\u8c61\u5206\u522b\u662f\uff1a<br>pageContext (PageContextImpl \u7c7b)\u3001\u5f53\u524d jsp \u9875\u9762\u8303\u56f4\u5185\u6709\u6548<br>request (HttpServletRequest \u7c7b)\u3001\u4e00\u6b21\u8bf7\u6c42\u5185\u6709\u6548<br>session (HttpSession \u7c7b)\u3001\u4e00\u4e2a\u4f1a\u8bdd\u8303\u56f4\u5185\u6709\u6548\uff08\u6253\u5f00\u6d4f\u89c8\u5668\u8bbf\u95ee\u670d\u52a1\u5668\uff0c\u76f4\u5230\u5173\u95ed\u6d4f\u89c8\u5668\uff09<br>application(ServletContext \u7c7b)\u3001\u6574\u4e2a web \u5de5\u7a0b\u8303\u56f4\u5185\u90fd\u6709\u6548\uff08\u53ea\u8981 web \u5de5\u7a0b\u4e0d\u505c\u6b62\uff0c\u6570\u636e\u90fd\u5728\uff09<\/p>\n\n\n\n<p>\u57df\u5bf9\u8c61\u662f\u53ef\u4ee5\u50cf Map \u4e00\u6837\u5b58\u53d6\u6570\u636e\u7684\u5bf9\u8c61\u3002\u56db\u4e2a\u57df\u5bf9\u8c61\u529f\u80fd\u4e00\u6837\u3002\u4e0d\u540c\u7684\u662f\u5b83\u4eec\u5bf9\u6570\u636e\u7684\u5b58\u53d6\u8303\u56f4\u3002<\/p>\n\n\n\n<p>\u867d\u7136\u56db\u4e2a\u57df\u5bf9\u8c61\u90fd\u53ef\u4ee5\u5b58\u53d6\u6570\u636e\u3002\u5728\u4f7f\u7528\u4e0a\u5b83\u4eec\u662f\u6709\u4f18\u5148\u987a\u5e8f\u7684\u3002<\/p>\n\n\n\n<p>\u56db\u4e2a\u57df\u5728\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u4f18\u5148\u987a\u5e8f\u5206\u522b\u662f\uff0c\u4ed6\u4eec\u4ece\u5c0f\u5230\u5927\u7684\u8303\u56f4\u7684\u987a\u5e8f\u3002<\/p>\n\n\n\n<p>pageContext ====&gt;&gt;&gt; request ====&gt;&gt;&gt; session ====&gt;&gt;&gt; application<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>scope.jsp \u9875\u9762\n\n&lt;body&gt;\n&lt;h1&gt;scope.jsp \u9875\u9762&lt;\/h1&gt;\n&lt;%\n\/\/ \u5f80\u56db\u4e2a\u57df\u4e2d\u90fd\u5206\u522b\u4fdd\u5b58\u4e86\u6570\u636e\npageContext.setAttribute(\"key\", \"pageContext\");\nrequest.setAttribute(\"key\", \"request\");\nsession.setAttribute(\"key\", \"session\");\napplication.setAttribute(\"key\", \"application\");\n%&gt;\npageContext \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=pageContext.getAttribute(\"key\")%&gt; &lt;br&gt;\nrequest \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=request.getAttribute(\"key\")%&gt; &lt;br&gt;\nsession \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=session.getAttribute(\"key\")%&gt; &lt;br&gt;\napplication \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=application.getAttribute(\"key\")%&gt; &lt;br&gt;\n&lt;%\nrequest.getRequestDispatcher(\"\/scope2.jsp\").forward(request,response);\n%&gt;\n&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>scope2.jsp \u9875\u9762\n\n&lt;body&gt;\n&lt;h1&gt;scope2.jsp \u9875\u9762&lt;\/h1&gt;\npageContext \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=pageContext.getAttribute(\"key\")%&gt; &lt;br&gt;\nrequest \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=request.getAttribute(\"key\")%&gt; &lt;br&gt;\nsession \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=session.getAttribute(\"key\")%&gt; &lt;br&gt;\napplication \u57df\u662f\u5426\u6709\u503c\uff1a&lt;%=application.getAttribute(\"key\")%&gt; &lt;br&gt;&lt;\/body&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">6.jsp \u4e2d\u7684 out \u8f93\u51fa\u548c response.getWriter \u8f93\u51fa\u7684\u533a\u522b<\/h2>\n\n\n\n<p>response \u4e2d\u8868\u793a\u54cd\u5e94\uff0c\u6211\u4eec\u7ecf\u5e38\u7528\u4e8e\u8bbe\u7f6e\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u7684\u5185\u5bb9\uff08\u8f93\u51fa\uff09<br>out \u4e5f\u662f\u7ed9\u7528\u6237\u505a\u8f93\u51fa\u4f7f\u7528\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-110-1024x361.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"361\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-110-1024x361.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2236\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u7531\u4e8e jsp \u7ffb\u8bd1\u4e4b\u540e\uff0c\u5e95\u5c42\u6e90\u4ee3\u7801\u90fd\u662f\u4f7f\u7528 out \u6765\u8fdb\u884c\u8f93\u51fa\uff0c\u6240\u4ee5\u4e00\u822c\u60c5\u51b5\u4e0b\u3002\u6211\u4eec\u5728 jsp \u9875\u9762\u4e2d\u7edf\u4e00\u4f7f\u7528 out \u6765\u8fdb\u884c\u8f93\u51fa\u3002\u907f\u514d\u6253\u4e71\u9875\u9762\u8f93\u51fa\u5185\u5bb9\u7684\u987a\u5e8f\u3002<\/p>\n\n\n\n<p>out.write() \u8f93\u51fa\u5b57\u7b26\u4e32\u6ca1\u6709\u95ee\u9898<br>out.print() \u8f93\u51fa\u4efb\u610f\u6570\u636e\u90fd\u6ca1\u6709\u95ee\u9898\uff08\u90fd\u8f6c\u6362\u6210\u4e3a\u5b57\u7b26\u4e32\u540e\u8c03\u7528\u7684 write \u8f93\u51fa\uff09<\/p>\n\n\n\n<p>\u6df1\u5165\u6e90\u7801\uff0c\u6d45\u51fa\u7ed3\u8bba\uff1a\u5728 jsp \u9875\u9762\u4e2d\uff0c\u53ef\u4ee5\u7edf\u4e00\u4f7f\u7528 out.print()\u6765\u8fdb\u884c\u8f93\u51fa<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7.jsp \u7684\u5e38\u7528\u6807\u7b7e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">a)jsp \u9759\u6001\u5305\u542b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u793a\u4f8b\u8bf4\u660e\uff1a\n\n&lt;%--\n&lt;%@ include file=\"\"%&gt; \u5c31\u662f\u9759\u6001\u5305\u542b\nfile \u5c5e\u6027\u6307\u5b9a\u4f60\u8981\u5305\u542b\u7684 jsp \u9875\u9762\u7684\u8def\u5f84\n\u5730\u5740\u4e2d\u7b2c\u4e00\u4e2a\u659c\u6760 \/ \u8868\u793a\u4e3a http:\/\/ip:port\/\u5de5\u7a0b\u8def\u5f84\/ \u6620\u5c04\u5230\u4ee3\u7801\u7684 web \u76ee\u5f55\n\n\u9759\u6001\u5305\u542b\u7684\u7279\u70b9\uff1a\n1\u3001\u9759\u6001\u5305\u542b\u4e0d\u4f1a\u7ffb\u8bd1\u88ab\u5305\u542b\u7684 jsp \u9875\u9762\u3002\n2\u3001\u9759\u6001\u5305\u542b\u5176\u5b9e\u662f\u628a\u88ab\u5305\u542b\u7684 jsp \u9875\u9762\u7684\u4ee3\u7801\u62f7\u8d1d\u5230\u5305\u542b\u7684\u4f4d\u7f6e\u6267\u884c\u8f93\u51fa\u3002\n--%&gt;\n&lt;%@ include file=\"\/include\/footer.jsp\"%&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">b)jsp \u52a8\u6001\u5305\u542b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u793a\u4f8b\u8bf4\u660e\uff1a\n\n&lt;%--\n&lt;jsp:include page=\"\"&gt;&lt;\/jsp:include&gt; \u8fd9\u662f\u52a8\u6001\u5305\u542b\npage \u5c5e\u6027\u662f\u6307\u5b9a\u4f60\u8981\u5305\u542b\u7684 jsp \u9875\u9762\u7684\u8def\u5f84\n\u52a8\u6001\u5305\u542b\u4e5f\u53ef\u4ee5\u50cf\u9759\u6001\u5305\u542b\u4e00\u6837\u3002\u628a\u88ab\u5305\u542b\u7684\u5185\u5bb9\u6267\u884c\u8f93\u51fa\u5230\u5305\u542b\u4f4d\u7f6e\n\n\u52a8\u6001\u5305\u542b\u7684\u7279\u70b9\uff1a\n1\u3001\u52a8\u6001\u5305\u542b\u4f1a\u628a\u5305\u542b\u7684 jsp \u9875\u9762\u4e5f\u7ffb\u8bd1\u6210\u4e3a java \u4ee3\u7801\n2\u3001\u52a8\u6001\u5305\u542b\u5e95\u5c42\u4ee3\u7801\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\u53bb\u8c03\u7528\u88ab\u5305\u542b\u7684 jsp \u9875\u9762\u6267\u884c\u8f93\u51fa\u3002\nJspRuntimeLibrary.include(request, response, \"\/include\/footer.jsp\", out, false);\n3\u3001\u52a8\u6001\u5305\u542b\uff0c\u8fd8\u53ef\u4ee5\u4f20\u9012\u53c2\u6570\n--%&gt;\n&lt;jsp:include page=\"\/include\/footer.jsp\"&gt;\n&lt;jsp:param name=\"username\" value=\"bbj\"\/&gt;\n&lt;jsp:param name=\"password\" value=\"root\"\/&gt;\n&lt;\/jsp:include&gt;<\/code><\/pre>\n\n\n\n<p>\u52a8\u6001\u5305\u542b\u7684\u5e95\u5c42\u539f\u7406\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-111.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"977\" height=\"505\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-111.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2237\"  sizes=\"(max-width: 977px) 100vw, 977px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">c)jsp \u6807\u7b7e-\u8f6c\u53d1<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u793a\u4f8b\u8bf4\u660e\uff1a\n\n&lt;%--\n&lt;jsp:forward page=\"\"&gt;&lt;\/jsp:forward&gt; \u662f\u8bf7\u6c42\u8f6c\u53d1\u6807\u7b7e\uff0c\u5b83\u7684\u529f\u80fd\u5c31\u662f\u8bf7\u6c42\u8f6c\u53d1\npage \u5c5e\u6027\u8bbe\u7f6e\u8bf7\u6c42\u8f6c\u53d1\u7684\u8def\u5f84\n--%&gt;\n&lt;jsp:forward page=\"\/scope2.jsp\"&gt;&lt;\/jsp:forward&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">8\u3001jsp \u7684\u7ec3\u4e60\u9898<\/h2>\n\n\n\n<p>\u7ec3\u4e60\u4e00\uff1a\u5728 jsp \u9875\u9762\u4e2d\u8f93\u51fa\u4e5d\u4e5d\u4e58\u6cd5\u53e3\u8bc0\u8868<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %&gt;\n&lt;html&gt;\n&lt;head&gt;\n&lt;title&gt;Title&lt;\/title&gt;\n&lt;style type=\"text\/css\"&gt;\ntable{\nwidth: 650px;\n}\n&lt;\/style&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n&lt;%-- \u7ec3\u4e60\u4e00\uff1a\u5728 jsp \u9875\u9762\u4e2d\u8f93\u51fa\u4e5d\u4e5d\u4e58\u6cd5\u53e3\u8bc0\u8868 --%&gt;\n&lt;h1 align=\"center\"&gt;\u4e5d\u4e5d\u4e58\u6cd5\u53e3\u8bc0\u8868&lt;\/h1&gt;\n&lt;table align=\"center\"&gt;\n&lt;%-- \u5916\u5c42\u5faa\u73af\u904d\u5386\u884c --%&gt;\n&lt;% for (int i = 1; i &lt;= 9; i++) { %&gt;\n&lt;tr&gt;\n&lt;%-- \u5185\u5c42\u5faa\u73af\u904d\u5386\u5355\u5143\u683c --%&gt;\n&lt;% for (int j = 1; j &lt;= i ; j++) { %&gt;\n&lt;td&gt;&lt;%=j + \"x\" + i + \"=\" + (i*j)%&gt;&lt;\/td&gt;\n&lt;% } %&gt;\n&lt;\/tr&gt;\n&lt;% } %&gt;\n&lt;\/table&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p> \u7ec3\u4e60\u4e8c\uff1ajsp \u8f93\u51fa\u4e00\u4e2a\u8868\u683c\uff0c\u91cc\u9762\u6709 10 \u4e2a\u5b66\u751f\u4fe1\u606f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-112-1024x362.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"362\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-112-1024x362.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2254\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>Student \u7c7b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Student {\nprivate Integer id;\nprivate String name;\nprivate Integer age;\nprivate String phone;<\/code><\/pre>\n\n\n\n<p>SearchStudentServlet \u7a0b\u5e8f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class SearchStudentServlet extends HttpServlet {\n@Override\nprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,\nIOException {\n\/\/ \u83b7\u53d6\u8bf7\u6c42\u7684\u53c2\u6570\n\/\/ \u53d1 sql \u8bed\u53e5\u67e5\u8be2\u5b66\u751f\u7684\u4fe1\u606f\n\/\/ \u4f7f\u7528 for \u5faa\u73af\u751f\u6210\u67e5\u8be2\u5230\u7684\u6570\u636e\u505a\u6a21\u62df\nList&lt;Student&gt; studentList = new ArrayList&lt;Student&gt;();\nfor (int i = 0; i &lt; 10; i++) {\nint t = i + 1;\nstudentList.add(new Student(t,\"name\"+t, 18+t,\"phone\"+t));\n}\n\/\/ \u4fdd\u5b58\u67e5\u8be2\u5230\u7684\u7ed3\u679c\uff08\u5b66\u751f\u4fe1\u606f\uff09\u5230 request \u57df\u4e2d\nreq.setAttribute(\"stuList\", studentList);\n\/\/ \u8bf7\u6c42\u8f6c\u53d1\u5230 showStudent.jsp \u9875\u9762\nreq.getRequestDispatcher(\"\/test\/showStudent.jsp\").forward(req,resp);\n}\n}<\/code><\/pre>\n\n\n\n<p>showStudent.jsp \u9875\u9762<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;%@ page import=\"java.util.List\" %>\n&lt;%@ page import=\"top.qaqaq.pojo.Student\" %>\n&lt;%@ page import=\"java.util.ArrayList\" %>\n&lt;%@ page contentType=\"text\/html;charset=UTF-8\" language=\"java\" %>\n&lt;html>\n&lt;head>\n&lt;title>Title&lt;\/title>\n&lt;style>\ntable{\nborder: 1px blue solid;\nwidth: 600px;\nborder-collapse: collapse;\n}\ntd,th{\nborder: 1px blue solid;\n}\n&lt;\/style>\n&lt;\/head>\n&lt;body>\n&lt;%--\u7ec3\u4e60\u4e8c\uff1ajsp \u8f93\u51fa\u4e00\u4e2a\u8868\u683c\uff0c\u91cc\u9762\u6709 10 \u4e2a\u5b66\u751f\u4fe1\u606f\u3002--%>\n&lt;%\nList&lt;Student> studentList = (List&lt;Student>) request.getAttribute(\"stuList\");\n%>\n&lt;table>\n&lt;tr>\n&lt;td>\u7f16\u53f7&lt;\/td>\n&lt;td>\u59d3\u540d&lt;\/td>\n&lt;td>\u5e74\u9f84&lt;\/td>\n&lt;td>\u7535\u8bdd&lt;\/td>\n&lt;td>\u64cd\u4f5c&lt;\/td>&lt;\/tr>\n&lt;% for (Student student : studentList) { %>\n&lt;tr>\n&lt;td>&lt;%=student.getId()%>&lt;\/td>\n&lt;td>&lt;%=student.getName()%>&lt;\/td>\n&lt;td>&lt;%=student.getAge()%>&lt;\/td>\n&lt;td>&lt;%=student.getPhone()%>&lt;\/td>\n&lt;td>\u5220\u9664\u3001\u4fee\u6539&lt;\/td>&lt;\/tr>\n&lt;% } %>\n&lt;\/table>\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">9\u3001\u4ec0\u4e48\u662f Listener \u76d1\u542c\u5668\uff1f<\/h2>\n\n\n\n<p>1\u3001Listener \u76d1\u542c\u5668\u5b83\u662f JavaWeb \u7684\u4e09\u5927\u7ec4\u4ef6\u4e4b\u4e00\u3002JavaWeb \u7684\u4e09\u5927\u7ec4\u4ef6\u5206\u522b\u662f\uff1aServlet \u7a0b\u5e8f\u3001Filter \u8fc7\u6ee4\u5668\u3001Listener \u76d1\u542c\u5668\u3002<br>2\u3001Listener \u5b83\u662f JavaEE \u7684\u89c4\u8303\uff0c\u5c31\u662f\u63a5\u53e3<br>3\u3001\u76d1\u542c\u5668\u7684\u4f5c\u7528\u662f\uff0c\u76d1\u542c\u67d0\u79cd\u4e8b\u7269\u7684\u53d8\u5316\u3002\u7136\u540e\u901a\u8fc7\u56de\u8c03\u51fd\u6570\uff0c\u53cd\u9988\u7ed9\u5ba2\u6237\uff08\u7a0b\u5e8f\uff09\u53bb\u505a\u4e00\u4e9b\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">9.1\u3001ServletContextListener \u76d1\u542c\u5668<\/h3>\n\n\n\n<p>ServletContextListener \u5b83\u53ef\u4ee5\u76d1\u542c ServletContext \u5bf9\u8c61\u7684\u521b\u5efa\u548c\u9500\u6bc1\u3002<\/p>\n\n\n\n<p>ServletContext \u5bf9\u8c61\u5728 web \u5de5\u7a0b\u542f\u52a8\u7684\u65f6\u5019\u521b\u5efa\uff0c\u5728 web \u5de5\u7a0b\u505c\u6b62\u7684\u65f6\u5019\u9500\u6bc1\u3002<\/p>\n\n\n\n<p>\u76d1\u542c\u5230\u521b\u5efa\u548c\u9500\u6bc1\u4e4b\u540e\u90fd\u4f1a\u5206\u522b\u8c03\u7528 ServletContextListener \u76d1\u542c\u5668\u7684\u65b9\u6cd5\u53cd\u9988\u3002<\/p>\n\n\n\n<p>\u4e24\u4e2a\u65b9\u6cd5\u5206\u522b\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public interface ServletContextListener extends EventListener {\n\/**\n* \u5728 ServletContext \u5bf9\u8c61\u521b\u5efa\u4e4b\u540e\u9a6c\u4e0a\u8c03\u7528\uff0c\u505a\u521d\u59cb\u5316\n*\/\npublic void contextInitialized(ServletContextEvent sce);\n\/**\n* \u5728 ServletContext \u5bf9\u8c61\u9500\u6bc1\u4e4b\u540e\u8c03\u7528\n*\/\npublic void contextDestroyed(ServletContextEvent sce);\n}<\/code><\/pre>\n\n\n\n<p>\u5982\u4f55\u4f7f\u7528 ServletContextListener \u76d1\u542c\u5668\u76d1\u542c ServletContext \u5bf9\u8c61\u3002<br>\u4f7f\u7528\u6b65\u9aa4\u5982\u4e0b\uff1a<br>1\u3001\u7f16\u5199\u4e00\u4e2a\u7c7b\u53bb\u5b9e\u73b0 ServletContextListener<br>2\u3001\u5b9e\u73b0\u5176\u4e24\u4e2a\u56de\u8c03\u65b9\u6cd5<br>3\u3001\u5230 web.xml \u4e2d\u53bb\u914d\u7f6e\u76d1\u542c\u5668<\/p>\n\n\n\n<p>\u76d1\u542c\u5668\u5b9e\u73b0\u7c7b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class MyServletContextListenerImpl implements ServletContextListener {\n@Override\npublic void contextInitialized(ServletContextEvent sce) {\nSystem.out.println(\"ServletContext \u5bf9\u8c61\u88ab\u521b\u5efa\u4e86\");}\n@Override\npublic void contextDestroyed(ServletContextEvent sce) {\nSystem.out.println(\"ServletContext \u5bf9\u8c61\u88ab\u9500\u6bc1\u4e86\");}\n}<\/code><\/pre>\n\n\n\n<p>web.xml \u4e2d\u7684\u914d\u7f6e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!--\u914d\u7f6e\u76d1\u542c\u5668-->\n&lt;listener>\n&lt;listener-class>top.qaqaq.listener.MyServletContextListenerImpl&lt;\/listener-class>\n&lt;\/listener><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>08-jsp 1.\u4ec0\u4e48\u662f jsp\uff0c\u5b83\u6709\u4ec0\u4e48\u7528? jsp \u7684\u5168\u79f0\u662f java server pages\u3002Java [&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-2226","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\/2226"}],"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=2226"}],"version-history":[{"count":5,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2226\/revisions"}],"predecessor-version":[{"id":3248,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2226\/revisions\/3248"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}