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