<!-- 使用getProperty方式獲取用戶名和密碼 -->
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
? <head>
? ? <base href="<%=basePath%>">
? ??
? ? <title>My JSP 'dologin2.jsp' starting page</title>
? ??
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> ? ?
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
? </head>
??
? <body>
? <jsp:useBean id="myUsers" class="com.po.Users" scope="page"/>
? ?<h1>setProperty動作元素的使用方法</h1>
? ?<hr>
? ?<!-- 根據表單自動匹配所有的屬性 -->
? ?<%--?
? ?<jsp:setProperty name="myUsers" property="*"/>
? ?--%>
? ?
? ?<!-- 根據表單匹配部分的屬性 -->
? ?<%--
? ?<jsp:setProperty name="myUsers" property="username"/>
? ?--%>
? ? <!-- 跟表單無關通過手工賦值給屬性 -->
? <%--
? ?<jsp:setProperty name="myUsers" property="username" value=“lisi” />
? ?<jsp:setProperty name="myUsers" property="password" value=“1234ss”/>
? ?--%>
? ?
? ?<!-- 通過URL傳參數給屬性賦值 -->
? ?<%--
? ?<jsp:setProperty name="myUsers" property="username" param="mypass" />
? ? --%>
? <!-- 使用傳統的表達式方式來獲取用戶名和密碼 -->
<%--
用戶名：<%=myUsers.getUsername() %><br>
? ?密碼：<%=myUsers.getPassword() %><br>
? --%>
? <!-- ?使用getProperty方式獲取用戶名和密碼 -->
? 用戶名：<jsp:getProperty name="myUsers" property="username"/><br>
? 密碼：<jsp:getProperty property="password" name="myUsers"/>
? ?
? </body>
</html>
MyEclipse2016 跟著老師做的
?<!-- 跟表單無關通過手工賦值給屬性 -->這個出錯。
<!-- ?使用getProperty方式獲取用戶名和密碼 -->
? 用戶名：<jsp:getProperty name="myUsers" property="username"/><br>
? 密碼：<jsp:getProperty property="password" name="myUsers"/>
這個獲得的是null,怎么辦
2016-11-19
dologin2.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
? <head>
? ? <base href="<%=basePath%>">
? ??
? ? <title>My JSP 'dologin2.jsp' starting page</title>
? ??
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> ? ?
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
? </head>
??
? <body>
? <jsp:useBean id="myUsers" class="com.po.Users" scope="page"/>
? ?<h1>setProperty動作元素的使用方法</h1>
? ?<hr>
? ?<!-- 根據表單自動匹配所有的屬性 -->
? ?<%--?
? ?<jsp:setProperty name="myUsers" property="*"/>
? ?--%>
? ?
? ?<!-- 根據表單匹配部分的屬性 -->
? ?<%--
? ?<jsp:setProperty name="myUsers" property="username"/>
? ?--%>
? ? <!-- 跟表單無關通過手工賦值給屬性 -->
??
? ?<jsp:setProperty name="myUsers" property="username" value=“lisi” />
? ?<jsp:setProperty name="myUsers" property="password" value=“1234ss”/>
? ?
? ?
? ?<!-- 通過URL傳參數給屬性賦值 -->
? ?<%--
? ?<jsp:setProperty name="myUsers" property="username" param="mypass" />
? ? --%>
? <!-- 使用傳統的表達式方式來獲取用戶名和密碼 -->
<%--
用戶名：<%=myUsers.getUsername() %><br>
? ?密碼：<%=myUsers.getPassword() %><br>
? --%>
? <!-- ?使用getProperty方式獲取用戶名和密碼 -->
? 用戶名：<jsp:getProperty name="myUsers" property="username"/><br>
? 密碼：<jsp:getProperty property="password" name="myUsers"/>
? ?
? </body>
</html>
注釋去了之后出現了如下錯誤
HTTP Status 500 - /dologin2.jsp (line: 40, column: 62) quote symbol expected
type Exception report
message /dologin2.jsp (line: 40, column: 62) quote symbol expected
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /dologin2.jsp (line: 40, column: 62) quote symbol expected
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:443)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:89)
org.apache.jasper.compiler.Parser.parseAttribute(Parser.java:222)
org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:162)
org.apache.jasper.compiler.Parser.parseAttributes(Parser.java:153)
org.apache.jasper.compiler.Parser.parseSetProperty(Parser.java:897)
org.apache.jasper.compiler.Parser.parseStandardAction(Parser.java:1118)
org.apache.jasper.compiler.Parser.parseElements(Parser.java:1434)
org.apache.jasper.compiler.Parser.parse(Parser.java:138)
org.apache.jasper.compiler.ParserController.doParse(ParserController.java:242)
org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:374)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.56 logs.
Apache Tomcat/7.0.56
2016-11-19
? ? <!-- 跟表單無關通過手工賦值給屬性 -->
? <%--
? ?<jsp:setProperty name="myUsers" property="username" value=“lisi” />
? ?<jsp:setProperty name="myUsers" property="password" value=“1234ss”/>
? ?--%>
把這段代碼的注釋去掉