這篇文章主要介紹了JSP的setProperty的使用方法的相關資料,希望通過本文能幫助到大家，讓大家理解應用setProperty,需要的朋友可以參考下
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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