| 发表于：2007-05-14 11:33:48 楼主 |
环境变量的配置:
> catalina_base:d:\tomcat5.5
> catalina_home:d:\tomcat5.5
> class_path:.;%java_home%\lib\dt.jar;%java_home%\lib\tools.jar;%tomcat_home%\lib
> java_home:c:\jdk1.5.0_06
> path:c:\jdk1.5.0_06\bin;.;c:\jdk1.5.0_06\lib\dt.jar;c:\jdk1.5.0_06\lib\tools.jar
> tomcat_home:d:\tomcat5.5
> class文件放在:tomcat5.5/webapps/myjavabean/wen-inf/classes
> jsp文件放在：tomcat5.5/webapps/myjavabean
> 在浏览器输入:http://localhost:8080/myjavabean/counterjavabeanjsp.jsp
> 错误如下：
> type exception report
> message
> description the server encountered an internal error （) that prevented
> it from fulfilling this request.
> exception
> org.apache.jasper.jasperexception: unable to compile class for jsp
> generated servlet error:
> the import counter cannot be resolved
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
>
> org.apache.jasper.servlet.jspservletwrapper.handlejspexception（jspservletwrapper.java:510)
> org.apache.jasper.servlet.jspservletwrapper.service（jspservletwrapper.java:375)
> org.apache.jasper.servlet.jspservlet.servicejspfile（jspservlet.java:314)
> org.apache.jasper.servlet.jspservlet.service（jspservlet.java:264)
> javax.servlet.http.httpservlet.service（httpservlet.java:802)
>
> root cause
> org.apache.jasper.jasperexception: unable to compile class for jsp
> generated servlet error:
> the import counter cannot be resolved
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
> an error occurred at line: 3 in the jsp file: /counterjavabeanjsp.jsp
> generated servlet error:
> counter cannot be resolved to a type
>
> org.apache.jasper.compiler.defaulterrorhandler.javacerror（defaulterrorhandler.java:84)
> org.apache.jasper.compiler.errordispatcher.javacerror（errordispatcher.java:328)
> org.apache.jasper.compiler.jdtcompiler.generateclass（jdtcompiler.java:414)
> org.apache.jasper.compiler.compiler.compile（compiler.java:297)
> org.apache.jasper.compiler.compiler.compile（compiler.java:276)
> org.apache.jasper.compiler.compiler.compile（compiler.java:264)
> org.apache.jasper.jspcompilationcontext.compile（jspcompilationcontext.java:563)
> org.apache.jasper.servlet.jspservletwrapper.service（jspservletwrapper.java:303)
> org.apache.jasper.servlet.jspservlet.servicejspfile（jspservlet.java:314)
> org.apache.jasper.servlet.jspservlet.service（jspservlet.java:264)
> javax.servlet.http.httpservlet.service（httpservlet.java:802)
>
> note the full stack trace of the root cause is available in the apache
> tomcat/5.5.17 logs.
> java源代码:
> import java.io.*;
> public class counter
> { long count=0;
> public long getcount（)
> {
> return count;
> }
> public synchronized long setcount（)
> {count++;
> return count;
> }
> }
> jsp代码:
> <%@ page contenttype= "text/html;charset=gb2312 " %>
> <%@ page import= "counter " %>
> <jsp:usebean id= "counter " class= "counter " scope= "application ">
> </jsp:usebean>
> <html>
> <head>
> <title> 用javabean作网站计数器 </title>
> </head>
> <body>
> <% if（session.isnew（))//如果是一个新的会话
> counter.setcount（);
> %>
> <p> <p> 欢迎访问本站，您是第
> <%=counter.getcount（)%>
> 个访问用户。
> </body>
> </html>
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