关于javabean的存放目录问题

bean应该放在包里,在你的程序里用上package关键字,然后再用调用.

解决方案 »

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你是指把Demo.class放在一个jar包里，然后放在classes目录下吗？
我说的不是打包成jar,只是在你bean的最前面加上一名package yourPackageName,编译通过后再调用yourPackageName.Demo就行了.
这是原文件：
package mypk;
public class Demo
{
String name="";
public void setName(String aName)
{
name=aName;
}
public String getName()
{
return name;
}
}
编译完后，只给出了class，没有包喔...
你如果这样写的话：
package mypk;
public class Demo{
……
}
要将生成的类文件放到web-inf\classes\mydk下就可以了
对啊..我就是这样放的,但还是出错..
我怀疑是我的Tomcat有问题,我装的是5.0版本
这两天一直在搞这个,烦死~
谢谢大侠指导喔.....
org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
    [javac] Compiling 1 source fileC:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:42: cannot resolve symbol
symbol  : class Demo
location: package mypk
      mypk.Demo demo = null;
          ^An error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:44: cannot resolve symbol
symbol  : class Demo
location: package mypk
        demo = (mypk.Demo) pageContext.getAttribute("demo", PageContext.SESSION_SCOPE);
                    ^An error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:46: cannot resolve symbol
symbol  : class Demo
location: package mypk
          demo = new mypk.Demo();
这些错误
type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: Unable to compile class for JSPAn error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
    [javac] Compiling 1 source fileC:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:42: cannot resolve symbol
symbol  : class Demo
location: class org.apache.jsp.ub_jsp
      Demo demo = null;
      ^
An error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:44: cannot resolve symbol
symbol  : class Demo
location: class org.apache.jsp.ub_jsp
        demo = (Demo) pageContext.getAttribute("demo", PageContext.SESSION_SCOPE);

An error occurred at line: 10 in the jsp file: /ub.jspGenerated servlet error:
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\ub_jsp.java:46: cannot resolve symbol
symbol  : class Demo
location: class org.apache.jsp.ub_jsp
          demo = new Demo();
                     ^
3 errors
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:552)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
通过javabean里的id可以直接调用Demo里的方法了，不用再去声明Demo demo = new Demo();了吧
对啊..以上是错误信息.
我在jsp是这样调用的:
<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="mypk.*"%>
<html>
<body>
<jsp:useBean id="demo" class="Demo" scope="session" />
</body>
</html>