{"id":2434,"date":"2020-10-28T16:58:05","date_gmt":"2020-10-28T08:58:05","guid":{"rendered":"http:\/\/admin.evshou.com\/?p=2434"},"modified":"2020-10-28T16:58:05","modified_gmt":"2020-10-28T08:58:05","slug":"2020javaweb%e6%95%99%e7%a8%8b%e4%b9%8bjsp","status":"publish","type":"post","link":"https:\/\/www.9713job.com\/?p=2434","title":{"rendered":"2020javaweb\u6559\u7a0b\u4e4bJSP"},"content":{"rendered":"

2020javaweb\u6559\u7a0b\u4e4bJSP<\/h3>\n

\u4ec0\u4e48\u662fJSP\uff1f<\/span><\/strong>
\n\u5168\u79f0\uff1a Java Server Pages,java\u670d\u52a1\u5668\u9875\u9762<\/span>\u3002\u548cServlet\u4e00\u6837\uff0c\u662fsun\u516c\u53f8\u5b9a\u4e49\u7684\u4e00\u79cd\u52a8\u6001\u7f51\u9875\u5f00\u53d1\u6280\u672f\u3002
\n\u7279\u70b9\uff1a\u57fa\u4e8ehtml\u6a21\u7248\uff0c\u53ef\u4ee5\u5728html\u6a21\u7248\u5d4c\u5165java\u4ee3\u7801\u548cjsp\u4e2d\u7684\u6807\u7b7e\u3002
\n<\/p>\n

Tomcat\u53ef\u4ee5\u5305\u542b\u7684\u8d44\u6e90\u6709\u9759\u6001\u8d44\u6e90\u548c\u52a8\u6001\u8d44\u6e90<\/span><\/strong>\uff1a
\n\u9759\u6001\u8d44\u6e90\uff1aHTML+css+js<\/span>
\n\u52a8\u6001\u8d44\u6e90\uff1aservlet\u3001JSP<\/span><\/p>\n

\u4e3a\u4ec0\u4e48\u8981\u7528JSP\uff1f<\/span><\/strong><\/p>\n

1.jsp\u6027\u80fd\u597d<\/span>\uff0c\u53ef\u4ee5\u5728HTML\u9875\u9762\u4e2d\u52a8\u6001\u5d4c\u5165\u5143\u7d20
\n2.\u670d\u52a1\u5668\u8c03\u7528<\/span>\u7684\u662f\u5df2\u7ecf\u7f16\u8bd1\u597d\u7684jsp\u6587\u4ef6<\/span>
\n3.jsp\u57fa\u4e8ejava servlet Api<\/span> \u6709\u5f88\u591a\u5f3a\u5927\u4f01\u4e1a\u652f\u6301
\n4.jsp\u53ef\u4ee5\u4e0e\u5904\u7406\u4e1a\u52a1\u903b\u8f91\u7684servlet\u4e00\u8d77\u4f7f\u7528<\/span>\uff0c\u8be5\u6a21\u5f0f\u88abjava servlet\u6a21\u677f\u5f15\u64ce\u6240\u652f\u6301<\/p>\n

JSP\u6784\u6210<\/span><\/strong><\/p>\n

JSP\u9875\u9762\u4e2d\u53ef\u4ee5\u5305\u542b\u6307\u4ee4\uff0cJava\u8bed\u53e5\u3001\u53d8\u91cf\u3001\u65b9\u6cd5\u6216\u8868\u8fbe\u5f0f\u3001\u9759\u6001\u5185\u5bb9(html\u3001css\u3001javascript)<\/p>\n

\u811a\u672c\u5143\u7d20<\/span>(Scripting Elements):\u58f0\u660e\u3001\u811a\u672c\u6bb5\u3001\u8868\u8fbe\u5f0f\u3002
\n\u6ce8\u91ca\u6307\u4ee4<\/span>(Comment Elements):HTML\u6ce8\u91ca\u3001Java\u6ce8\u91ca\u3001JSP\u9690\u5f0f\u6ce8\u91ca\u3002
\n\u6307\u4ee4\u5143\u7d20<\/span>(Directive Elements):page\u3001include\u3001taglib \u7b49
\n\u52a8\u4f5c\u5143\u7d20<\/span>(Action Elements):jsp:include\u3001jsp:forward\u3001jsp:useBean\u7b49\u3002<\/p>\n

JSP\u6307\u4ee4<\/span><\/strong><\/p>\n

\u544a\u8bc9JSP\u5f15\u64ce\u5982\u4f55\u89e3\u6790JSP\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9<\/p>\n

\u8bed\u6cd5\uff1a <%@ \u6307\u4ee4\u540d\u79f0 \u5c5e\u6027\u540d\u79f01\uff1d\u201c\u5c5e\u6027\u503c1\u201d \u5c5e\u6027\u540d\u79f02\uff1d\u201c\u5c5e\u6027\u503c2\u201d \u3002\u3002\u3002\u3002\u3002%> \u200b
\n\u793a\u4f8b\uff1a<%@ page language=”java” contentType=”text\/html; charset=UTF-8″ pageEncoding=”UTF-8″%><\/p>\n

page\u6307\u4ee4<\/span><\/strong>
\n\u4f5c\u7528\uff1a\u7528\u4e8e\u5b9a\u4e49JSP\u9875\u9762\u7684\u5404\u79cd\u5c5e\u6027<\/p>\n

<%@ page import=”java.util.Date,java.util.List”%><\/span><\/p>\n

session:\u662f\u5426\u4f1a\u81ea\u52a8\u521b\u5efasession\u5bf9\u8c61\uff0c\u9ed8\u8ba4\u503c\u4e3atrue;
\n<%@ page session=”false” %><\/span><\/p>\n

buffer:JSP\u4e2d\u6709javax.servlet.jsp.JspWriter\u8f93\u51fa\u5b57\u7b26\u6d41\u3002\u8bbe\u7f6e\u8f93\u51fa\u6570\u636e\u7684\u7f13\u5b58\u5927\u5c0f\u3002\u9ed8\u8ba48kb.
\n<%@ page buffer=”80kb” %><\/span><\/p>\n

errorPage:\u5982\u679c\u9875\u9762\u4e2d\u6709\u9519\u8bef\uff0c\u8df3\u8f6c\u5230\u6307\u5b9a\u7684\u8d44\u6e90 errorPage=”\/uri” \u5982\u679c\u5199\u201c\/\u201d\u5219\u4ee3\u8868\u5f53\u524d\u5e94\u7528\u7684\u76ee\u5f55 \u4e0b\uff0c\u7edd\u5bf9\u8def\u5f84\u3002 \u5982\u679c\u4e0d\u5199\u201c\/\u201d\u5219\u4ee3\u8868\u76f8\u5bf9\u8def\u5f84
\n<%@ page errorPage=”URI” %><\/span><\/p>\n

isErrorPage:\u662f\u5426\u521b\u5efathrowable\u5bf9\u8c61\u3002\u9ed8\u8ba4\u662ffalse
\n<%@ page isErrorPage=”true” %><\/span><\/p>\n

contentType:\u7b49\u540c\u4e8eresponse.setContentType(\u201ctext\/html\u201d\uff1bcharset=utf-8);\u670d\u52a1\u5668\u53d1\u9001\u5ba2\u6237\u7aef\u7684\u5185\u5bb9\u7f16\u7801
\n<%@ page contentType=”text\/html;charset=utf-8″ language=”java” %><\/span><\/p>\n

pageEncoding: Jsp\u6587\u4ef6\u672c\u8eab\u7684\u7f16\u7801
\n<%@ page pageEncoding=”UTF-8″ %><\/span><\/p>\n

isELIgnored: \u662f\u5426\u652f\u6301EL\u8868\u8fbe\u5f0f\u3002 \u9ed8\u8ba4\u662ffalse,\u652f\u6301\u8868\u8fbe\u5f0f;\u662ftrue\u8868\u793a\u4e0d\u652f\u6301\u8868\u8fbe\u5f0f\uff0c${1+1};false\u8f93\u51fa\u7ed3\u679c2 true\u6309\u7167\u539f\u6837\u8f93\u51fa
\n<%@ page isELIgnored=”false” %><\/span><\/p>\n

include\u6307\u4ee4<\/span><\/strong><\/p>\n

\u9759\u6001\u5305\u542b(\u9875\u9762\u5408\u5e76)\uff1a<%@ include file=”test.jsp” %><\/span>
\n\u52a8\u6001\u5305\u542b(\u52a8\u6001\u5f15\u7528)\uff1a<jsp:include page=”test.jsp”><\/span><\/p>\n

\u811a\u672c\u5143\u7d20<\/p>\n

\u811a\u672c\uff1a
\n<%<\/span><\/p>\n

java\u4ee3\u7801<\/span>
\nint a=97;\/\/\u5c40\u90e8\u53d8\u91cf<\/span>
\nout.write(a);\/\/\u6253\u5370\u5230\u9875\u9762<\/span><\/p>\n

%><\/span><\/p>\n

\u811a\u672c\u8868\u8fbe\u5f0f\uff1a<%=2+3 %>\u7b49\u4ef7\u4e8e\u8f93\u51fa\u8bed\u53e5 (\u6ce8\u610f\uff1a\u4e0d\u80fd\u4f7f\u7528\u5206\u53f7\u6765\u7ed3\u675f\u8868\u8fbe\u5f0f)<\/span><\/p>\n

<%!<\/p>\n

\u5b9a\u4e49\u65b9\u6cd5
\npublic void eat(){}
\nint num=5;\/\/\u5168\u5c40\u53d8\u91cf<\/p>\n

%><\/p>\n

jsp:forward\u8bf7\u6c42\u8f6c\u53d1<\/span><\/strong><\/p>\n

<jsp:forward page=\"index.jsp\">\r\n    <jsp:param name=\"username\" value=\"admin\"\/>\r\n    <jsp:param name=\"password\" value=\"123456\"\/>\r\n<\/jsp:forward><\/pre>\n
<%\r\n  String username = request.getParameter(\"username\");\r\n  String password = request.getParameter(\"password\");\r\n%>\r\n\u83b7\u53d6\u503c<%=username%> <br><%=password%><\/pre>\n
JavaBean\u6307\u4ee4<\/span><\/strong><\/p>\n
<%\r\n    \/\/java\u4ee3\u7801\u521b\u5efa\r\n    Users users=new Users();\r\n    users.setUsername(\"admin\");\r\n    users.setPassword(\"admin\");\r\n%>\r\n<%--1.\u58f0\u660e\u5f15\u7528 2.\u67e5\u8be2\u6709\u6ca1\u6709\u91cd\u590d\u7684 3.\u521b\u5efa\u65b0\u5bf9\u8c61 4.\u5b58\u5230\u4f5c\u7528\u57df 5.\u8d4b\u503c--%>\r\n<jsp:useBean id=\"user\" class=\"entity.Users\"><\/jsp:useBean>\r\n<jsp:setProperty name=\"user\" property=\"username\" value=\"admin888\"><\/jsp:setProperty>\r\n<jsp:setProperty name=\"user\" property=\"password\" value=\"admin888\"><\/jsp:setProperty><\/pre>\n
<%--\u53d6\u503c--%>\r\n<%=users.getUsername()%>\r\n<jsp:getProperty name=\"user\" property=\"username\"\/><\/pre>\n
\u8868\u5355\u7cbe\u786e\u5339\u914d<\/span><\/strong><\/p>\n
<jsp:useBean id=\"users2\" class=\"entity.Users\"><\/jsp:useBean>\r\n<jsp:setProperty name=\"users2\" property=\"*\"><\/jsp:setProperty>\r\n<jsp:getProperty name=\"users2\" property=\"username\"\/>\r\n<jsp:getProperty name=\"users2\" property=\"password\"\/><\/pre>\n
\u5229\u7528setProperty\u5c01\u88c5\u6210\u5bf9\u8c61<\/span><\/strong><\/p>\n
\u8868\u5355\u9875\u9762<\/span><\/p>\n
<form action=\"test.jsp\" method=\"post\">\r\n    username : <input type=\"text\" name=\"username\"><br>\r\n    password : <input type=\"password\" name=\"password\"><br>\r\n    <input type=\"submit\" value=\"\u6ce8\u518c\">\r\n<\/form><\/pre>\n
jsp\u9875\u9762<\/span><\/p>\n
<jsp:useBean id=\"users2\" class=\"entity.Users\"><\/jsp:useBean>\r\n<jsp:setProperty name=\"users2\" property=\"*\"><\/jsp:setProperty><\/span>\r\n<%\r\n    request.setAttribute(\"users\",users2);\r\n    request.getRequestDispatcher(\"\/test\").forward(request,response);\r\n%>\r\n<jsp:getProperty name=\"users2\" property=\"username\"\/>\r\n<jsp:getProperty name=\"users2\" property=\"password\"\/><\/pre>\n
servlet<\/span><\/p>\n
Users users = (Users) request.getAttribute(\"users\");\r\nUsersService us=new UsersServiceImpl();\r\nint add = us.add(users);<\/pre>\n
 <\/p>\n
\u5185\u7f6e\u5bf9\u8c61<\/span><\/strong><\/p>\n
\u4e5d\u5927\u5185\u7f6e\u5bf9\u8c61<\/span><\/p>\n
servlet\u4e2d\u5185\u7f6e\u5bf9\u8c61\uff1a
\nrequest\u3001response\u3001session\u3001application\u3001config\u3001exception\u3001out\u3001pageContext\u3001page<\/p>\n
\"\"<\/p>\n
\u5b58\u5230\u4f5c\u7528\u57df<\/span><\/strong><\/p>\n
<%\r\n    pageContext.setAttribute(\"mobile\",\"133\");\r\n    request.setAttribute(\"username\",\"admin\");\r\n    session.setAttribute(\"password\",\"admin888\");\r\n    application.setAttribute(\"sex\",\"\u7537\");<\/span>\r\n    request.getRequestDispatcher(\"test.jsp\").forward(request,response);\r\n    response.sendRedirect(\"test.jsp\");\r\n%><\/pre>\n
\u5728\u4f5c\u7528\u57df\u53d6\u503c<\/span><\/strong><\/p>\n
<%\r\n    \/\/pageContext\u7684\u81ea\u8eab\u4f5c\u7528\u57df\u4ec5\u80fd\u4f5c\u7528\u5728\u5f53\u524djsp\uff0c\u4e0d\u80fd\u8de8\u8bf7\u6c42\r\n    Object mobile = pageContext.getAttribute(\"mobile\")<\/span>;\r\n    \/\/request\u5bf9\u5e94\u7684\u662f\u4e00\u6b21\u8bf7\u6c42\uff0c\u91cd\u5b9a\u5411\u6216\u8de8\u8d8a\u8d85\u8fc71\u4e2a\u9875\u9762\u5c31\u4e22\u5931\u4e86\r\n    Object username = request.getAttribute(\"username\");<\/span>\r\n    \/\/session\u5bf9\u5e94\u4e00\u6b21\u4f1a\u8bdd\uff0c\u6d4f\u89c8\u5668\u5173\u95ed\u5c31\u4e22\u5931\u4e86\r\n    Object password = session.getAttribute(\"password\");<\/span>\r\n    \/\/application\u5bf9\u5e94\u4e00\u6b21\u670d\u52a1\u5668\u542f\u52a8\uff0c\u5173\u95ed\u5373\u9500\u6bc1\r\n    Object sex = application.getAttribute(\"sex\");<\/span>\r\n%>\r\n<%=username%> <br>\r\n<%=password%> <br>\r\n<%=sex%> <br>\r\n<%=mobile%><\/pre>\n
JSP\u7684out\u548cgetWriter()\u65b9\u6cd5\u7684\u533a\u522b<\/span><\/strong><\/p>\n
1.out\u662fJspWriter\u7c7b\u578b\uff0cgetWriter()\u662fPrintWriter\u7c7b\u578b
\n2.out\u8f93\u51fa\u5230\u7f13\u51b2\u533a\u4e2d\uff0c\u6ca1\u6709\u5199\u5230response\u4e2d\uff0cgetWriter()\u76f4\u63a5\u5199\u5230response\u4e2d
\n3.out\u4e00\u822c\u7528\u5728jsp\u4e2d\uff0cgetWriter()\u7528\u5728servlet\u4e2d<\/p>\n
pageContext\u5bf9\u8c61<\/span><\/strong><\/p>\n
pageContext\u4f5c\u7528\uff1a1.\u4ee3\u8868\u5bb9\u5668\u4f7f\u7528 2.\u4ee3\u8868\u9875\u9762\u4e0a\u4e0b\u6587\uff0c\u83b7\u53d6\u5176\u4ed6\u516b\u4e2a\u5185\u7f6e\u5bf9\u8c61<\/span><\/p>\n
\u57df\u5bf9\u8c61\uff1a<\/span><\/p>\n
jsp\u4e2d\u5171\u5305\u542b\u56db\u4e2a\u57df\u5bf9\u8c61\u5206\u522b\u662fpageContext\u3001request\u3001session\u3001application<\/p>\n
request\u57df\u7684\u4f7f\u7528\u573a\u666f:\u672c\u6b21\u8bf7\u6c42\u4e4b\u540e\uff0c\u6570\u636e\u5c31\u4e0d\u518d\u4f7f\u7528\u4e86\uff0c\u6839\u636e\u5b66\u53f7\u67e5\u8be2\u5b66\u751f\uff0c\u6839\u636e\u65b0\u95fbid\u67e5\u8be2\u65b0\u95fb\u3002<\/p>\n
session\u57df\u7684\u4f7f\u7528\u573a\u666f:\u540c\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\u5171\u4eab\u7684\u6570\u636e\uff0c\u4f7f\u7528session\uff0c\u7528\u6237\u767b\u5f55\u4fe1\u606f<\/p>\n
application\u57df\u7684\u4f7f\u7528\u573a\u666f:\u6240\u6709\u7528\u6237\u5171\u4eab\u7684\u6570\u636e\u3002\u6574\u4e2a\u7a0b\u5e8f\u7684\u914d\u7f6e\u4fe1\u606f<\/p>\n
pageContext\u57df\u7684\u4f7f\u7528\u573a\u666f\uff1a\u5f53\u524d\u9875\u9762\u3002<\/p>\n
\u5176\u4e2dpageContext\u53ef\u4ee5\u64cd\u4f5c\u5176\u4ed6\u4e09\u4e2a\u57df\u5bf9\u8c61(request,session,application)\u7684\u6570\u636e<\/p>\n
<%\r\n    \/\/\u5b58\u7684\u662f\u5f53\u524d\u9875\u9762\u4f5c\u7528\u57df\r\n    pageContext.setAttribute(\"user\",\"user\");\r\n    \/\/\u5b58\u5728\u6307\u5b9a\u7684\u4f5c\u7528\u57df\u91cc\r\n    pageContext.setAttribute(\"username\",\"admin\",PageContext.REQUEST_SCOPE<\/span>);\r\n    \/\/\u5b58\u5728session\u91cc\r\n    pageContext.setAttribute(\"password\",\"123\",PageContext.SESSION_SCOPE<\/span>);\r\n    \/\/\u5b58\u5728application\u91cc\r\n    pageContext.setAttribute(\"mobile\",\"133\",PageContext.APPLICATION_SCOPE<\/span>);\r\n%>\r\n<%=pageContext.getAttribute(\"user\")%>\r\n<%=pageContext.getAttribute(\"username\")%>\r\n<%=pageContext.getAttribute(\"password\")%>\r\n<%=pageContext.getAttribute(\"mobile\")%>\r\n<br>\r\n<%--\u7528pageContext\u5728\u6240\u6709\u4f5c\u7528\u57df\u91cc\u53d6\u503c\uff0cgetAttribute\u65b9\u6cd5\u9700\u8981\u6307\u5b9a\u540d\u79f0\u3001\u4f5c\u7528\u57df--%>\r\n<%=pageContext.getAttribute(\"username\",2)%>\r\n<%=pageContext.getAttribute(\"password\",3)%>\r\n<%=pageContext.getAttribute(\"mobile\",4)%>\r\n<br>\r\n<%--\u9002\u5408\u4e0d\u77e5\u9053\u5728\u54ea\u4e2a\u4f5c\u7528\u57df\u5b58\u7684,\u53ea\u77e5\u9053\u540d\u79f0<\/span>--%>\r\n<%=pageContext.findAttribute<\/span>(\"username\")%><\/pre>\n
\u5b83\u53ef\u4ee5\u8bbf\u95ee\u5176\u4ed68\u4e2a\u5185\u7f6e\u5bf9\u8c61<\/span><\/strong><\/p>\n
\u5728\u666e\u901a\u7c7b\u4e2d\u53ef\u4ee5\u901a\u8fc7PageContext\u83b7\u53d6\u5176\u5b83JSP\u9690\u5f0f\u5bf9\u8c61,\u5177\u4f53\u5982\u4e0b\uff1a<\/p>\n
getException\u65b9\u6cd5\u8fd4\u56deexception\u9690\u5f0f\u5bf9\u8c61
\ngetPage\u65b9\u6cd5\u8fd4\u56depage\u9690\u5f0f\u5bf9\u8c61
\ngetRequest\u65b9\u6cd5\u8fd4\u56derequest\u9690\u5f0f\u5bf9\u8c61
\ngetResponse\u65b9\u6cd5\u8fd4\u56deresponse\u9690\u5f0f\u5bf9\u8c61
\ngetServletConfig\u65b9\u6cd5\u8fd4\u56deconfig\u9690\u5f0f\u5bf9\u8c61
\ngetServletContext\u65b9\u6cd5\u8fd4\u56deapplication\u9690\u5f0f\u5bf9\u8c61
\ngetSession\u65b9\u6cd5\u8fd4\u56desession\u9690\u5f0f\u5bf9\u8c61
\ngetOut\u65b9\u6cd5\u8fd4\u56deout\u9690\u5f0f\u5bf9\u8c61<\/p>\n
\u63d0\u4f9b\u4e86\u7b80\u6613\u65b9\u6cd5\uff1a<\/span><\/p>\n
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