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

一介绍

<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。

二四种形式

三实例

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>

四运行结果