\u6211\u4eec\u53ea\u9700\u8981\u5728\u7f51\u9875\u91cc\u8c03\u7528response.setStatus\uff08\uff09\uff1b\u5c31\u53ef\u4ee5\u66f4\u6539\u9875\u9762\u72b6\u6001\uff0c\u7c7b\u4f3c\u4e8e\u6211\u4eec\u770b\u5230\u7684404 not found\uff08P50\u6700\u4e0a\u9762\uff09<\/p><\/blockquote>\n
\u8fd9\u91cc\u5176\u5b9e\u4e66\u5199\u9519\u4e86\uff0c\u4e0d\u7ba1\u4f60\u4fe1\u4e0d\u4fe1\uff0c\u53cd\u6b63\u6211\u662f\u4fe1\u4e86\uff0c\u8fd9\u4e2aresponse.setStatus\uff08\uff09\uff1b\uff0c\u53ea\u53ef\u4ee5\u6539\u53d8\u72b6\u6001\u7801\uff0c\u4f46\u662f\u9875\u9762\u8fd8\u662f\u4f1a\u6267\u884c\u5b8c\u6bd5\u3002\u6362\u4e2a\u65b9\u5f0f\u8bf4\uff0c\u8fd0\u884c\u6210\u529f\u7684\u72b6\u6001\u7801\u4e00\u822c\u662f200\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u8ba9\u670d\u52a1\u5668\u8fd4\u56de\u7684\u72b6\u6001\u7801\u53d8\u6210\u4f60\u60f3\u8981\u7684\u4e00\u4e2a\u6570\u5b57\uff0c\u800c\u771f\u6b63\u505a\u5230\u8fd9\u4e2a\u529f\u80fd\u7684\u65b9\u6cd5\uff0c\u5b9e\u9645\u4e0a\u662fresponse.sendError();
\n\u6211\u4eec\u6765\u68c0\u9a8c\u4e00\u4e0b\u3002
\nexample3_6.jsp
\n <\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY>\n <% response.setStatus(408);\n \/\/response.sendError(408);\n out.print(\"\u4e0d\u663e\u793a\u4e86\");\n %>\n<\/BODY><\/HTML><\/pre>\n
\n\u6211\u4eec\u5148\u4f7f\u7528setStatus()\uff1b\u53d1\u73b0\u4f9d\u7136\u53ef\u4ee5\u663e\u793a\uff0c\u4f46\u662f\u5e95\u4e0b\u7684\u72b6\u6001\u7801\u53d8\u6210\u4e86408.\uff08\u5982\u679c\u4f60\u5fd8\u4e86\u53ef\u4ee5\u5411\u4e0a\u7ffb\uff0c\u8fd0\u884c\u6210\u529f\u7684\u72b6\u6001\u7801\u662f\u4e00\u4e2a\u7eff\u8272\u7684200\uff09
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620121048.png\")
\n
\n\u6211\u4eec\u8bd5\u8bd5sendError();
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620121113.png\")
\n\u9875\u9762\u53d8\u6210\u4e86HTTP status 408 \uff0c\u72b6\u6001\u7801\u4f9d\u7136\u662f408\u3002<\/p>\n
3.session\u5bf9\u8c61<\/h3>\n
\u6211\u4eec\u90fd\u77e5\u9053\uff0cHTTP\u662f\u65e0\u72b6\u6001\u8fde\u63a5\uff0c\u90a3\u4e48\u670d\u52a1\u5668\u600e\u4e48\u533a\u5206\u7528\u6237\u5462\uff0c\u7528\u7684\u5c31\u662fsession\u5bf9\u8c61\u3002\u7528\u6237\u5728\u8bbf\u95ee\u4e00\u4e2aWeb\u670d\u52a1\u76ee\u5f55\u671f\u95f4\uff0c\u670d\u52a1\u5668\u4e3a\u8be5\u7528\u6237\u91cd\u65b0\u5206\u914d\u4e00\u4e2asession\u5bf9\u8c61\uff0c\u670d\u52a1\u5668\u53ef\u4ee5\u5728\u5404\u4e2a\u9875\u9762\u4f7f\u7528\u8fd9\u4e2asession\u8bb0\u5f55\u5f53\u524d\u7528\u6237\u7684\u6709\u5173\u4fe1\u606f\u3002\u670d\u52a1\u5668\u4fdd\u8bc1\u4e0d\u540c\u7528\u6237\u7684session\u5bf9\u8c61\u4e92\u4e0d\u76f8\u540c\u3002\u6211\u4eec\u901a\u5e38\u6240\u8bf4\u7684cookies\uff0c\u5c31\u662f\u6d4f\u89c8\u5668\u7528\u6765\u4fdd\u5b58session\u5bf9\u8c61\u7684\u3002
\nexample3_7.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY bgcolor=white>\n \u6211\u662ffirst.jsp\u9875\u9762,\u8f93\u5165\u4f60\u7684\u59d3\u540d\u8fde\u63a5\u5230second.jsp\n <% String id=session.getId();\n out.println(\"\u60a8\u7684session\u5bf9\u8c61\u7684ID\u662f\uff1a<br>\"+id);\n %>\n <FORM action=\"myfile\/second.jsp\" method=post name=form>\n <INPUT type=\"text\" name=\"boy\">\n <INPUT TYPE=\"submit\" value=\"\u9001\u51fa\" name=submit>\n <\/FORM>\n<\/BODY><\/HTML><\/pre>\n
\nsecond.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY bgcolor=white>\n \u6211\u662fsecond.jsp\u9875\u9762\n <% String id=session.getId();\n out.println(\"\u60a8\u7684session\u5bf9\u8c61\u7684ID\u662f\uff1a<br>\"+id);\n %>\n<BR> \u70b9\u51fb\u8d85\u94fe\u63a5\uff0c\u8fde\u63a5\u5230third.jsp\u7684\u9875\u9762\u3002\n<A HREF=\"\/myfile\/third.jsp\"> \u6b22\u8fce\u53bbthird.jsp\u9875\u9762\uff01<\/A>\n<\/BODY><\/HTML><\/pre>\n
\nthird.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY bgcolor=white>\n \u6211\u662fthird.jsp\u9875\u9762\n <% String id=session.getId();\n out.println(\"\u60a8\u7684session\u5bf9\u8c61\u7684ID\u662f\uff1a<br>\"+id);\n %>\n<BR> \u70b9\u51fb\u8d85\u94fe\u63a5\uff0c\u8fde\u63a5\u5230first.jsp\u7684\u9875\u9762\u3002\n<A HREF=\"..\/example3_7.jsp\"> \u6b22\u8fce\u53bbfirst.jsp\uff01<\/A>\n<\/BODY><\/HTML><\/pre>\n
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620122930.png\")
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620122936.png\")
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620122941.png\")
\n\u6211\u4eec\u53d1\u73b0\uff0c\u6bcf\u4e2a\u754c\u9762\u7684session ID\u90fd\u662f\u4e00\u6837\u7684\uff0c\u5982\u679c\u6211\u4eec\u628a\u6d4f\u89c8\u5668\u4fdd\u5b58cookies\u7684\u9009\u9879\u5173\u6389\uff0c\u6211\u4eec\u5c31\u4f1a\u53d1\u73b0\u53e6\u4e00\u79cd\u60c5\u51b5\u3002
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620122956.png\")
\n\u6211\u4eec\u53d1\u73b0\u6bcf\u4e2a\u9875\u9762\u7684session ID\u90fd\u662f\u4e0d\u4e00\u6837\u7684\u3002
\n
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620123009.png\")
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620123014.png\")
\n\u8fd9\u5c31\u662fsession ID\u7684\u4f5c\u7528\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5728session\u5bf9\u8c61\u4e2d\u5b58\u50a8\u6570\u636e\u3002
\n1.public void setAttibute(String key,Object obj)
\n\u8c03\u7528\u8be5\u65b9\u6cd5\u53ef\u4ee5\u5411session\u5bf9\u8c61\u6307\u5b9a\u4e00\u4e2a\u7d22\u5f15\u5173\u952e\u5b57\uff0c\u5982\u679c\u6dfb\u52a0\u7684\u4e24\u4e2a\u5173\u952e\u5b57\u76f8\u540c\uff0c\u90a3\u5148\u524d\u7684\u4f1a\u88ab\u8986\u76d6\u3002
\n2.public Object getAttribute(String key)
\n\u8fd4\u56de\u5173\u952e\u5b57\u5bf9\u5e94\u7684\u5bf9\u8c61\uff0cObject\u7c7b\u578b\u7684\uff0c\u9700\u8981\u5f3a\u5236\u8f6c\u6362\u3002
\n3.public void removeAttribute(String name)
\n\u79fb\u9664\u5bf9\u5e94\u5bf9\u8c61\u3002
\n <\/p>\n
3 session\u7684\u751f\u547d\u5468\u671f<\/h4>\n
session\u8fbe\u5230\u53d1\u5446\u65f6\u95f4\u6216\u8005\u670d\u52a1\u5668\u5173\u95ed\uff0csession\u5931\u6548\u3002
\n\u53d1\u5446\u65f6\u95f4\u662f\u6307\u670d\u52a1\u5668\u6ca1\u6709\u6536\u5230\u7528\u6237\u7684\u8bf7\u6c42\u7684\u65f6\u95f4\u3002
\n\u53ef\u4ee5\u4fee\u6539\u89e3\u538b\u76ee\u5f55\u4e0b\u7684conf\/web.xml\u4e2d\u91cd\u65b0\u8bbe\u5b9aWeb\u670d\u52a1\u76ee\u5f55\u4e0b\u7684session\u5bf9\u8c61\u7684\u6700\u957f\u53d1\u5446\u65f6\u95f4\u3002<\/p>\n
<!-- ==================== Default Session Configuration ================= -->\n<!-- You can set the default session timeout (in minutes) for all newly -->\n<!-- created sessions by modifying the value below. -->\n <session-config>\n <session-timeout>30<\/session-timeout>\n <\/session-config>\n<\/pre>\n\u5c06\u5176\u4e2d\u768430\u6539\u4e3a\u9700\u8981\u7684\u503c\uff08\u5355\u4f4d\u5206\u949f\uff09\u3002
\n![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180620160554.png\")
\n\u5f53\u7136\u4e5f\u6709\u4e00\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u64cd\u4f5c\u8fd9\u4e2a\u503c\uff0c\u6bd4\u5982
\npublic long getCreationTime() \u53ef\u4ee5\u83b7\u53d6session\u7684\u521b\u5efa\u65f6\u95f4
\npublic long getMaxInactiveIntercal() \u53ef\u4ee5\u83b7\u53d6session\u6700\u540e\u4e00\u6b21\u88ab\u64cd\u4f5c\u7684\u65f6\u95f4
\npublic int getMaxInactiveInterval\uff08\uff09\u53ef\u4ee5\u83b7\u53d6\u6700\u957f\u53d1\u5446\u65f6\u95f4\uff08\u5355\u4f4d\u4e3a\u79d2\uff09
\npublic void setMaxInactiveInterval\uff08\uff09 \u8bbe\u7f6esession\u6700\u957f\u53d1\u5446\u65f6\u95f4\uff08\u5355\u4f4d\u4e3a\u79d2\uff09
\n <\/p>\n
4.application\u5bf9\u8c61<\/h3>\n
\u8be5\u5bf9\u8c61\u548csession\u5bf9\u8c61\u7c7b\u4f3c\uff0c\u90fd\u662f\u7528\u6765\u4fdd\u5b58\u4fe1\u606f\u7684\uff0c\u4e0d\u540c\u7684\u662f\uff0csession\u662f\u4e3a\u6bcf\u4e2a\u7528\u6237\u90fd\u5206\u914d\u4e00\u4e2a\uff0c\u6bcf\u4e2a\u7528\u6237\u72ec\u4eab\u4e00\u4e2asession\u5bf9\u8c61\uff0c\u5e76\u4e14\u968f\u7740\u53d1\u5446\u65f6\u95f4\u7ed3\u675f\u800c\u6d88\u5931\uff1b\u4f46\u662fapplication\u5bf9\u8c61\u662f\u968f\u7740\u9875\u9762\u7684\u5b58\u5728\u800c\u5b58\u5728\uff0c\u7528\u6765\u4fdd\u5b58\u9875\u9762\u4e2d\u7684\u4fe1\u606f\uff0c\u591a\u4e2a\u7528\u6237\u5171\u4eab\u4e00\u4e2aapplication\u5bf9\u8c61\uff0c\u4f46\u6bcf\u4e2aWeb\u670d\u52a1\u76ee\u5f55\u4e0b\u7684application\u4e92\u4e0d\u76f8\u540c\u3002
\napplication\u5bf9\u8c61\u4e5f\u548csession\u5bf9\u8c61\u4e00\u6837\u6709\u5f88\u591a\u4e0d\u540c\u7684\u65b9\u6cd5\uff1a
\n1.public void setAttibute(String key,Object obj)
\n\u8c03\u7528\u8be5\u65b9\u6cd5\u53ef\u4ee5\u5411session\u5bf9\u8c61\u6307\u5b9a\u4e00\u4e2a\u7d22\u5f15\u5173\u952e\u5b57\uff0c\u5982\u679c\u6dfb\u52a0\u7684\u4e24\u4e2a\u5173\u952e\u5b57\u76f8\u540c\uff0c\u90a3\u5148\u524d\u7684\u4f1a\u88ab\u8986\u76d6\u3002
\n2.public Object getAttribute(String key)
\n\u8fd4\u56de\u5173\u952e\u5b57\u5bf9\u5e94\u7684\u5bf9\u8c61\uff0cObject\u7c7b\u578b\u7684\uff0c\u9700\u8981\u5f3a\u5236\u8f6c\u6362\u3002
\n3.public void removeAttribute(String key)
\n\u79fb\u9664\u5bf9\u5e94\u5bf9\u8c61\u3002
\n
\n\u6817\u5b50\uff1a\u7528application\u5236\u4f5c\u7559\u8a00\u677f
\nexample3_8.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY>\n <FORM action=\"\/myfile\/messagePane.jsp\" method=\"post\" name=\"form\">\n \u8f93\u5165\u60a8\u7684\u540d\u5b57\uff1a<BR><INPUT type=\"text\" name=\"peopleName\">\n <BR>\u8f93\u5165\u60a8\u7684\u7559\u8a00\u6807\u9898\uff1a<BR><INPUT type=\"text\" name=\"Title\">\n <BR>\u8f93\u5165\u60a8\u7684\u7559\u8a00\uff1a<BR> <TEXTAREA name=\"messages\" ROWs=\"10\" COLS=36 WRAP=\"physical\"><\/TEXTAREA>\n <BR><INPUT type=\"submit\" value=\"\u63d0\u4ea4\u4fe1\u606f\" name=\"submit\">\n <\/FORM>\n <FORM action=\"\/myfile\/showMessage.jsp\" method=\"post\" name=\"form1\">\n <INPUT type=\"submit\" value=\"\u67e5\u770b\u7559\u8a00\u677f\" name=\"look\">\n <\/FORM>\n<\/BODY><\/HTML><\/pre>\n
\nmessagePane.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<%@ page import=\"java.util.*\" %>\n<HTML><BODY>\n <%! Vector v=new Vector();\n int i=0; ServletContext application;\n synchronized void sendMessage(String s)\n { application=getServletContext();;\n i++;\n v.add(\"No.\"+i+\",\"+s);\n application.setAttribute(\"Mess\",v);\n }\n %>\n <% String name=request.getParameter(\"peopleName\");\n String title=request.getParameter(\"Title\");\n String messages=request.getParameter(\"messages\");\n if(name==null)\n {name=\"guest\"+(int)(Math.random()*10000);\n }\n if(title==null)\n {title=\"\u65e0\u6807\u9898\";\n }\n if(messages==null)\n {messages=\"\u65e0\u4fe1\u606f\";\n }\n byte a[]=name.getBytes(\"ISO-8859-1\");\n name=new String(a);\n \t\t out.println(name+\"<br>\");\n \tbyte a1[]=title.getBytes(\"ISO-8859-1\");\n title=new String(a1);\n \t\t out.println(title+\"<br>\");\n \tbyte a2[]=messages.getBytes(\"ISO-8859-1\");\n messages=new String(a2);\n \t\t out.println(messages+\"<br>\");\n String s=\"\u59d3\u540d:\"+name+\"#\"+\"\u6807\u9898:\"+title+\"#\"+\"\u5185\u5bb9:\"+\"<BR>\"+messages;\n \/\/byte a3[]=s.getBytes(\"ISO-8859-1\");\n \/\/s=new String(a3);\n out.println(s+\"<br>\");\n sendMessage(s);\n out.print(\"\u60a8\u7684\u4fe1\u606f\u5df2\u7ecf\u63d0\u4ea4\uff01\");\n %>\n <A HREF=\"..\/example3_8.jsp\" >\u8fd4\u56de\n<\/BODY><\/HTML><\/pre>\n
\nshowMessage.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<%@ page import=\"java.util.*\" %>\n<HTML><BODY>\n <% Vector v=(Vector)application.getAttribute(\"Mess\");\n for(int i=0;i<v.size();i++)\n { String message=(String)v.elementAt(i);\n StringTokenizer fenxi=new StringTokenizer(message,\"#\");\n while(fenxi.hasMoreTokens())\n { String str=fenxi.nextToken();\n \/\/out.print(\"<BR>\"+str);\n \/\/byte a[]=str.getBytes(\"ISO-8859-1\");\n \/\/str=new String(a);\n out.print(\"<BR>\"+str);\n }\n }\n %>\n<\/BODY><\/HTML><\/pre>\n
\n\u7136\u540e\u6211\u4eec\u5c31\u53ef\u4ee5\u8bbf\u95ee\u9875\u9762\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u4efb\u4f55\u4eba\u53d1\u9001\u7684\u7559\u8a00\u53ef\u4ee5\u88ab\u6240\u6709\u4eba\u770b\u5230\u3002
\n <\/p>\n
5.out\u5bf9\u8c61<\/h3>\n
out\u5bf9\u8c61\u662f\u4e00\u4e2a\u8f93\u51fa\u6d41\uff0c\u7528\u6765\u5411\u5ba2\u6237\u7aef\u8f93\u51fa\u6570\u636e\u3002\u9700\u8981\u6ce8\u610f\u7684\u662fout.print\u548cout.println\uff0c\u867d\u7136\u4ecejava\u8bed\u6cd5\u6765\u8bf4\u4e24\u8005\u5dee\u4e00\u4e2a\u56de\u8f66\uff0c\u4f46\u662f\u6d4f\u89c8\u5668\u5e76\u4e0d\u8bc6\u522bprintln\u7684\u6362\u884c\u6807\u8bb0\uff0c\u6240\u4ee5\u5b9e\u9645\u4e0a\u4e8c\u8005\u6548\u679c\u4e00\u6837\uff0c\u5982\u679c\u9700\u8981\u6362\u884c\u53ef\u4ee5\u8f93\u51fa<br>\u5b9e\u73b0\u6362\u884c\u3002
\n
\n <\/p>\n
\u8bfe\u540e\u9898\uff1a<\/strong><\/h3>\n1.\u5047\u8bbeJSP\u4f7f\u7528\u7684\u8868\u5355\u4e2d\u6709\u5982\u4e0b\u7684GUI\uff1a<\/p>\n
<input type=\"checkbox\" name=\"item\" value=\"bird\">\u9e1f\n<input type=\"checkbox\" name=\"item\" value=\"apple\">\u82f9\u679c\n<input type=\"checkbox\" name=\"item\" value=\"cat\">\u732b\n<input type=\"checkbox\" name=\"item\" value=\"moon\">\u6708\u4eae<\/pre>\n\u8be5\u8868\u5355\u6240\u8bf7\u6c42\u7684JSP\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u5bf9\u8c61request\u83b7\u53d6\u8be5\u8868\u5355\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u90a3\u4e48\uff0c\u4e0b\u5217\u54ea\u4e9b\u662frequest\u83b7\u53d6\u8be5\u8868\u5355\u63d0\u4ea4\u7684\u503c\u7684\u6b63\u786e\u8bed\u53e5\uff08 C \uff09
\nA.String a = request.getParameter(“item”);
\nB.String b = request.getParameter(“checkbox”);
\nC.String a[] = request.getParameterValues(“item”);
\nD.String a[] = request.getParameterValues(“checkbox”);
\n2.\u5982\u679c\u8868\u5355\u63d0\u4ea4\u7684\u4fe1\u606f\u4e2d\u6709\u6c49\u5b57\uff0c\u63a5\u53d7\u8be5\u4fe1\u606f\u7684\u9875\u9762\u5e94\u505a\u600e\u6837\u7684\u5904\u7406\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u63a5\u53d7\u4e4b\u524d\u8c03\u7528request.setCharacterEncoding()\u6216\u8005\u63a5\u53d7\u4e4b\u540e\u4f7f\u7528<\/p>\n
String str=request.getParameter(\"message\");\nbyte a[]=str.getBytes(\"ISO-8859-1\");\nstr=new String(a);<\/pre>\n\u8fdb\u884c\u7f16\u7801\u8f6c\u6362\u3002
\n3.\u7f16\u5199\u4e24\u4e2aJSP\u9875\u9762inputString.jsp\u548ccomputer.jsp\uff0c\u7528\u6237\u53ef\u4ee5\u4f7f\u7528inputString.jsp\u63d0\u4f9b\u7684\u8868\u5355\u8f93\u5165\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5e76\u63d0\u4ea4\u7ed9computer.jsp\u9875\u9762\uff0c\u8be5\u9875\u9762\u901a\u8fc7\u5185\u7f6e\u5bf9\u8c61\u83b7\u53d6inputString.jsp\u9875\u9762\u63d0\u4ea4\u7684\u5b57\u7b26\u4e32\uff0c\u8ba1\u7b97\u5e76\u663e\u793a\u8be5\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002
\ninputString.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<html>\n<body bgcolor=white>\n <form action=\"computer.jsp\" method=\"post\">\n <input type=\"text\" name=\"message\" size=12 maxlength=12>\n <input type=\"submit\" name=\"submit\" value=\"submit\">\n <\/form>\n<\/body><\/html><\/pre>\n
\ncomputer.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<%\n String message=request.getParameter(\"message\");\n message=new String(message.getBytes(\"iso-8859-1\"));\n out.print(message.length());\n%><\/pre>\n
\n4.response\u8c03\u7528sendRedirect(URL url)\u65b9\u6cd5\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u54cd\u5e94\u7528\u6237\u65f6\uff0c\u9700\u8981\u5c06\u7528\u6237\u91cd\u65b0\u5f15\u5bfc\u81f3\u53e6\u4e00\u4e2a\u9875\u9762\uff0c\u4f8b\u5982\uff1a\u5982\u679c\u7528\u6237\u8f93\u5165\u7684\u8868\u5355\u4fe1\u606f\u4e0d\u5b8c\u6574\uff0c\u5c31\u4f1a\u518d\u88ab\u5f15\u5bfc\u5230\u8be5\u8868\u5355\u7684\u8f93\u5165\u9875\u9762\uff0c\u53ef\u4ee5\u4f7f\u7528response\u548csendRedirect\uff08URL url\uff09\u65b9\u6cd5\u5b9e\u73b0\u7528\u6237\u7684\u91cd\u5b9a\u5411\u3002
\n5.\u5bf9\u6817\u5b503_1\u7684\u4ee3\u7801\u8fdb\u884c\u6539\u52a8\uff0c\u5982\u679c\u7528\u6237\u57283_1\u9875\u9762\u63d0\u4f9b\u7684\u8868\u5355\u4e2d\u8f93\u5165\u4e86\u975e\u6570\u5b57\u5b57\u7b26\uff0cexample3_1_compute.jsp\u5c31\u5c06\u7528\u6237\u91cd\u65b0\u5b9a\u5411\u5230example3_1.jsp\u4e2d\u3002
\n\u53ea\u9700\u8981\u5bf9example3_1_compute.jsp\u8fdb\u884c\u6539\u52a8\uff08\u7b2c15\u884c\uff09
\nexample3_1_compute.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY bgcolor=white><Font size=3>\n <% String sideA=request.getParameter(\"sizeA\");\n String sideB=request.getParameter(\"sizeB\");\n String sideC=request.getParameter(\"sizeC\");\n try { double a=Double.parseDouble(sideA);\n double b=Double.parseDouble(sideB);\n double c=Double.parseDouble(sideC);\n double p=(a+b+c)\/2,area=0;\n area=Math.sqrt(p*(p-a)*(p-b)*(p-c));\n out.println(\"<BR>\u4e09\u89d2\u5f62\u9762\u79ef\"+area);\n }\n catch(NumberFormatException ee)\n {\n response.sendRedirect(\"..\/example3_9.jsp\"); \/\/\u539f\u6765\u662f out.print()\n }\n %>\n<\/FONT><\/BODY><\/HTML><\/pre>\n6.\u4e00\u4e2a\u7528\u6237\u5728\u4e0d\u540c\u7684Web\u670d\u52a1\u76ee\u5f55\u4e2d\u7684session\u5bf9\u8c61\u76f8\u540c\u4e48\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u4e0d\u76f8\u540c\u3002
\n7.\u4e00\u4e2a\u7528\u6237\u5728\u7528\u4e00Web\u670d\u52a1\u76ee\u5f55\u7684\u4e0d\u540c\u5b50\u76ee\u5f55\u4e2d\u7684session\u5bf9\u8c61\u76f8\u540c\u4e48\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u76f8\u540c\u3002
\n <\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148\u6211\u4eec\u5148\u5b66\u4e60\u4e00\u4e9bHTML\u6807\u8bb0 1.form\u6807\u8bb0 \u8bed\u6cd5\uff1a <form action=”\u76ee\u6807\u6587\u4ef6 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[22],"tags":[],"views":6448,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/236"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=236"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/236\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=236"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180618110122.png\")
![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180618104606.png\")
![\"\"](\"http:\/\/www.sniper97.cn\/wp-content\/uploads\/2018\/06\/QQ\u622a\u56fe20180618104514.png\")