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JSP的setProperty的使用方法

时间：2021-06-08 21:24 编辑：来源：阅读：
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摘要：JSP的setProperty的使用方法

[b]JSP的setProperty的使用方法[/b] [b]一介绍 [/b] <jsp:setProperty>作用给已经实例化的javabean对象的属性赋值，一共有四种形式。 [b]二四种形式[/b] [img]http://files.jb51.net/file_images/article/201710/20171012152641529.png?2017912152724[/img] [b]三实例[/b] 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%>" 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>
  <br>
  <br>
 </body>
</html>

[b]四运行结果[/b] [img]http://files.jb51.net/file_images/article/201710/20171012152812062.png?2017912152826[/img] 如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！

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