关于JSP中JavaBean的Scope属性

10/25/2009来源:JSP技巧人气:12213

测试application和request:

1.包:

package ScopeTest;

/**
 *
 * @author lucifer
 */
public class TestScope {
     PRivate int i;
     public TestScope(){
          i = 0;
     }
     public int getNextInt(){
          return ++i;
     }
}

2.jsp代码:

<%--
    Document   : TestScope
    Created on : 2009-10-3, 14:29:18
    Author     : lucifer
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">


<jsp:useBean id="reqScope" class="ScopeTest.TestScope" scope="request"/>
<jsp:useBean id="appScope" class="ScopeTest.TestScope" scope="application"/>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
        Application Scope:
        <jsp:getProperty name="appScope" property="nextInt"/>
        <br>
        Request Scope:
        <jsp:getProperty name="reqScope" property="nextInt"/>
        <form method="get" action="TestScope.jsp">
               <input type="submit" value="Reget">
        </form>
    </body>
</html>

3.输出:

Application Scope: 1
Request Scope: 1

 
按下按钮后输出:

Application Scope: 2
Request Scope: 1