useBean动作元素

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一 <jsp:useBeans>
作用:在jsp页面中实例化或者在指定范围内使用javabean:
<jsp:useBean id="标示符" class="java类全名" scope="作用范围">
 
二 代码
1、Users.java
package com.po;
/*
 * 用户类
 * */
public class Users {
 
        private String username;//用户名
        private String password;//密码
        
        //保留此默认的构造方法
        public Users()
        {
                
        }
 
        public String getUsername() {
                return username;
        }
 
        public void setUsername(String username) {
                this.username = username;
        }
 
        public String getPassword() {
                return password;
        }
 
        public void setPassword(String password) {
                this.password = password;
        }
        
        
}
2、useBean.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%>">
   
    <title>My JSP 'index.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">
        -->
  </head>
 
  <body>
    <jsp:useBean id="myUsers" class="com.po.Users" scope="page"/>
    <h1>使用useBean动作创建javabean的实例</h1>
    <hr>
       用户名:<%=myUsers.getUsername() %><br>
       密码:<%=myUsers.getPassword() %><br>
  </body>
</html>
 
三 测试

 



 
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