菜鸟问题！怎样在jsp页面调用一个连数据库的bean?

Question

<jsp:useBean id="***" scope="page" class="jdo.firm" />

Answer 1

<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="dbBean" scope="page" class="jdo.firm" />
countrs=dbBean.executeQuery("select count(*) as cnt from user where name<>'administrator'");

Answer 2

我现在这样做了，可是在执行插入一条纪录时又遇到一下错误，请大虾帮忙看看：
[javac] Since fork is true, ignoring compiler setting.
    [javac] Compiling 1 source file
    [javac] Since fork is true, ignoring compiler setting.
    [javac] D:\java\tomcat\work\Standalone\localhost\ht\personnel\add_jsp.java:80: illegal character: \65307    [javac]                                                       ^
    [javac] D:\java\tomcat\work\Standalone\localhost\ht\personnel\add_jsp.java:42: package jdo does not exist
    [javac]       jdo.firm addBean = null;
    [javac]          ^
    [javac] D:\java\tomcat\work\Standalone\localhost\ht\personnel\add_jsp.java:44: package jdo does not exist
    [javac]         addBean = (jdo.firm) pageContext.getAttribute("addBean", PageContext.REQUEST_SCOPE);
    [javac]                       ^
    [javac] D:\java\tomcat\work\Standalone\localhost\ht\personnel\add_jsp.java:47: package jdo does not exist
    [javac]             addBean = (jdo.firm) java.beans.Beans.instantiate(this.getClass().getClassLoader(), "jdo.firm");
    [javac]                           ^

Answer 3

package jdo does not existfirm.class文件要放在jdo文件夹下
jdo文件夹要放在WEB-INF/class下

Answer 4

bean的路经是这样的webroot\web-inf\classes\jdo，应该是对的吧！
tomcat我是每次有所改变都会重启的！

Answer 5

通过bean的ID（你自己定义的）号来调用

Answer 6

现在是这样的错误：
javac] D:\java\tomcat\work\Standalone\localhost\ht\personnel\add_jsp.java:80: illegal character: \65307