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JSP的setProperty的使用方法

jsp的setproperty的使用方法

一 介紹

<jsp:setproperty>作用

給已經實例化的javabean對象的屬性賦值，一共有四種形式。 

二 四種形式

三 實例

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%>" rel="external nofollow" rel="external nofollow" >
  
  <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" rel="external nofollow" rel="external nofollow" >
    -->
 
 </head>
 
 <body>
  <h1>系統登錄</h1>
  <hr>
  <form name="loginform" action="dologin.jsp?mypass=999999" method="post">
   <table>
    <tr>
     <td>用戶名：</td>
     <td><input type="text" name="username" value=""/></td>
    </tr>
    <tr>
     <td>密碼：</td>
     <td><input type="password" name="password" value=""/></td>
    </tr>
    <tr>
     <td colspan="2" align="center"><input type="submit" value="登錄"/></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%>" rel="external nofollow" rel="external nofollow" >
  
  <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" rel="external nofollow" rel="external nofollow" >
    -->
 
 </head>
 
 <body>
  <jsp:usebean id="myusers" class="com.po.users" scope="page"/>
  <h1>setproperty動作元素</h1>
  <hr>
  <!--根據表單自動匹配所有的屬性 -->
  <%--
  <jsp:setproperty name="myusers" property="*"/> 
  --%>
  <!--根據表單匹配所有部分的屬性 -->
  <%--
  <jsp:setproperty name="myusers" property="username"/> 
  --%>
  <!--根表單無關，通過手工賦值給屬性 -->
  <%--
  <jsp:setproperty name="myusers" property="username" value="lisi"/>
  <jsp:setproperty name="myusers" property="password" value="888888"/>
  --%>
  <!--通過url傳參數給屬性賦值 -->
  <jsp:setproperty name="myusers" property="username"/>
  <jsp:setproperty name="myusers" property="password" 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>
  <br>
  <br>
 </body>
</html>

四 運行結果

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