UC知道JSP+JavaBean的高手进。我是一个新手。
来源：百度知道 编辑：UC知道 时间：2024/09/21 23:32:54
Java代码：
package testa;
public class b
{
String hello = "";
public b(){}
public void setHello(String str)
{
hello = str;
}
public String getHello()
{
return hello;
}
}
JSP代码：
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="testa.b"%>
<html>
<body>
<jsp:useBean id="bc" class="testa.b" scope="page">
</jsp:useBean>
<%
bc.setHello("Hello");
%>
<%=bc.getHello()%>
</body>
</html>
运行结果：
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /javaBean2.jsp(6,0) The value for
package testa;
public class b
{
String hello = "";
public b(){}
public void setHello(String str)
{
hello = str;
}
public String getHello()
{
return hello;
}
}
JSP代码：
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="testa.b"%>
<html>
<body>
<jsp:useBean id="bc" class="testa.b" scope="page">
</jsp:useBean>
<%
bc.setHello("Hello");
%>
<%=bc.getHello()%>
</body>
</html>
运行结果：
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /javaBean2.jsp(6,0) The value for
在
<jsp:useBean id="bc" class="testa.b" scope="page">
</jsp:useBean>
之间加上这样一段代码再试试。
<jsp:setProperty property="*" name="bc" />
原因：你想在页面是设定Bean的属性，可是没有得到对其属性设定的权限。
只知道Servlet里面可以用 .setXX()方法
JavaBean标签一般是这么写
传值给bean:<jsp:setProperty name="bc" property="hello" value="hello"/>
从bean中取值::<jsp:getProperty name="bc" property="hello"/>