我的一个JSP+Javabean的练习放在如下路径
D:\J2ee\Apache Software Foundation\Tomcat 6.0\webapps\Jsp\exercises
useBean -folder 下面
-[WEB-INF] ---> Folder
-classes ----> folder
- tax ----> folder
-TaxRate.class
- TaxRate.java
-UseBean.jsp
-settax.jsp
UseBean.jsp
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- HTML code
<html><body><%@ page language="java" %><jsp:useBean id="taxbean" scope="application" class="tax.TaxRate" /><jsp:setProperty name="taxbean" property="*"/>产品:<jsp:getProperty name="taxbean" property="product"/><br>税率:<jsp:getProperty name="taxbean" property="rate"/></body></html>
settax.jsp
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- HTML code
<html><head><title>设置产品税率</title></head><body bgcolor="#fffffr"><FORM method="post" action="UseBean.jsp"> <TABLE border=0 cellspacing=1 cellpadding=5> <TR> <td width="100"> </td> <td align="right"><H1><FONT color="red">设置产品税率</FONT></H1></TD> </TR> <TR> <td width="100" align="right"><B><FONT color="blue">产品:</FONT></B></TD> <td align="left"><INPUT TYPE="text" name="product" size="30"></TD> </TR> <TR> <td width="100" align="right"><B><FONT color="blue">税率:</FONT></B></TD> <td align="left"><INPUT TYPE="text" name="rate" size="30"></TD> </TR> <TR> <td width="100"> </TD> <td align="right"></TD> </TR> <TR> <TD width="100"> </td> <td align="left"><input type="submit" value="Submit"></td> </tr> </table> </FORM> </BODY> </HTML>
TaxRate.java
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- Java code
package tax; public class TaxRate { double rate; String product; public TaxRate(){ } public void setProduct(String ProductName){ this.product=ProductName; } public String getProduct(){ return (this.product); } public void setRate(double rateValue){ this.rate=rateValue; } public double getRate(){ return this.rate;} }..\Tomact6.0\conf\Server.xml 中<host 部分的缺省如下
- XML code
<Host name="localhost" appBase="webapps" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false">
在ie 中进入以下页面 并输入 产品: test , 税率: 17.0
http://localhost:8080/Jsp/exercises/useBean/settax.jsp
提交后error message 如下：
org.apache.jasper.JasperException: /exercises/useBean/UseBean.jsp(4,0) The value for the useBean class attribute tax.TaxRate is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)