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JSP的setProperty的使用方法

2020-07-27 21:19:44

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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