JSP的getProperty

一 作用 获取指定Javabean对象的属性值。   二 语法 <jsp:getProperty name="Javabean实例名" property="属性名" />   三 代码 1、login.jsp <%@ page language = "java" import = "java.util.*" contentType = "text/html; charset=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 'login.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 >     < h1 > 系统登录 </ h1 >     < hr >     < form name = "loginForm" action = "dologin.jsp?mypass=999999" method = "post" >       < table >         < tr >           < td > 用户名： </ td >           < td >< input type = "text" name = "username" value = "" /></ td >         </ tr >         < tr >           < td > 密码： </ td >           < td >< input type = "password" name = "password" value = "" /></ td >         </ tr >         < tr >           < td colspan = "2" align = "center" >< input type = "submit" value = "登录" /></ td >                   </ tr >       </ table >     </ form >   </ body > </ html > 2、dologin.jsp <%@ page language = "java" import = "java.util.*" contentType = "text/html; charset=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 'dologin.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动作元素 </ h1 >     < hr >    <!--根据表单自动匹配所有的属性 -->    <%--    <jsp:setProperty name="myUsers" property="*"/>     --%>    <!--根据表单匹配所有部分的属性 -->    <%--    <jsp:setProperty name="myUsers" property=" username "/>     --%>    <!--根表单无关，通过手工赋值给属性 -->    <%--    <jsp:setProperty name="myUsers" property=" username " value=" lisi "/>    <jsp:setProperty name="myUsers" property="password" value="888888"/>    --%>    <!--通过URL传参数给属性赋值 -->    < jsp:setProperty name = "myUsers" property = "username" />    < jsp:setProperty name = "myUsers" property = "password" param = "mypass" />    <!-- 使用传统的表达式方式来获取用户名和密码 -->    <%--            用户名：<%=myUsers.getUsername() %><br>        密码：<%=myUsers.getPassword() %><br>    --%>    <!-- 使用getProperty方式来获取用户名和密码 -->       用户名： < jsp:getProperty name = "myUsers" property = "username" /> < br >       密码： < jsp:getProperty name = "myUsers" property = "password" />< br >    < br >    < br >   </ body > </ html >   四 运行结果