Well, it seems that you try to open a file called count.txt that just does not exist.
-hendrik
- - - - - - - - - - - - - - - - - - - - - - - - - - -
tagtraum industries http://www.tagtraum.com/
jo! small&smart 2.2 servletengine
Java Server & Servlets The web-application book
The WebApp Framework http://www.webapp.de/
Yang cun dong wrote:
> Hendrik Schreiber
> help me please, I make a counter ,but it reports the errorness as follow. I use
>tomcat3.1
>
> Error: 500
> Location: /website/index/file/jsp/count.jsp
> Internal Servlet Error:
>
> javax.servlet.ServletException: count.txt (ϵͳ�Ҳ���ָ�����ļ���)
> at
>org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386)
> at
>website.index.file.jsp._0002fwebsite_0002findex_0002ffile_0002fjsp_0002fcount_0002ejspcount_jsp_2._jspService(_0002fwebsite_0002findex_0002ffile_0002fjsp_0002fcount_0002ejspcount_jsp_2.java:117)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java, Compiled
>Code)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
> at
>org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java,
>Compiled Code)
> at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java,
>Compiled Code)
> at org.apache.jasper.runtime.JspServlet.service(JspServlet.java, Compiled
>Code)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
> at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java,
>Compiled Code)
> at org.apache.tomcat.core.ContextManager.service(ContextManager.java,
>Compiled Code)
> at
>org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java,
> Compiled Code)
> at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java,
>Compiled Code)
> at java.lang.Thread.run(Thread.java, Compiled Code)
>
> Root cause:
> java.io.FileNotFoundException: count.txt (ϵͳ�Ҳ���ָ�����ļ���)
> at java.io.FileInputStream.open(Native Method)
> at java.io.FileInputStream.(FileInputStream.java, Compiled Code)
> at java.io.FileReader.(FileReader.java:35)
> at
>website.index.file.jsp._0002fwebsite_0002findex_0002ffile_0002fjsp_0002fcount_0002ejspcount_jsp_2._jspService(_0002fwebsite_0002findex_0002ffile_0002fjsp_0002fcount_0002ejspcount_jsp_2.java:78)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java, Compiled
>Code)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
> at
>org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java,
>Compiled Code)
> at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java,
>Compiled Code)
> at org.apache.jasper.runtime.JspServlet.service(JspServlet.java, Compiled
>Code)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
> at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java,
>Compiled Code)
> at org.apache.tomcat.core.ContextManager.service(ContextManager.java,
>Compiled Code)
> at
>org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java,
> Compiled Code)
> at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java,
>Compiled Code)
> at java.lang.Thread.run(Thread.java, Compiled Code)
>
> �� 00-11-1 12:32:00 �����
> >Hi!
> >
> >I currently prefer the following:
> >
> > * encapsulate JDBC in some kind of beans or persistence layer. Do not spread SQL
> > statements all over your application. Do not embed SQL in JSP, even if some
> > taglib vendors offer that as feature.
> > * place your servlet independent application logic in your beans or business
> > objects.
> > * use a servlet or a logic JSP (no displaying here) to interprete the data you
> > receive from forms. do whatever you need to do with your database etc. here.
> > Place the objects you want to display in the request, the session or the
> > servletcontext, so that it is accessible from a display JSP. Then forward the
> > request to a display JSP appropriate for displaying whatever you need to
>display.
> > I.e. there is a 1:n relation between servlet/logic-JSP and display-JSP. There
> > shouldn't be a lot of code in the servlet. It should merely be used to call
> > methods of other servlet independent objects. Only the servlet specific code
>has
> > to be placed here.
> > * display your stuff with a display JSP. As you put your objects in the request
>(or
> > session, etc.). you can access them via <jsp:usebean>. In your display JSP make
> > sure you have no or close to no scriptlets. Use a taglib for iteration and
> > conditional execution (e.g. <customtag:foreach> and <customtag:if>). Write more
> > custom tags for other special display tasks. Do not write tags for stuff
>related
> > to application logic. Do not write too many tags.
> >
> >Why? If you follow the proposed way, you have a chance of achieving the following
> >goals:
> >
> > * separate your application from the web interface (no app logic in the servlet,
> > just the glue between the web and your app goes here, instead place the
>applogic
> > in your app beans or business objects)
> > * the glue/servlet code and the app code can be written and maintained by real
> > programmers, not HTML guys (no offense, HTML guys, it is really difficult to do
> > HTML and Java, but most people do only know to do either one really well)
> > * the display JSP can be written and maintained by HTML guys who learn some extra
> > stuff like iteration with custom tags and JSP expressions (e.g.
> > <%=person.getName()%>)
> > * JDBC is hidden, so not everybody has to know everything about the underlying
> > tables and has to be an expert in how to efficiently do joins etc. Also you can
> > reuse PreparedStatements (*in theory* that gives you a performance boost) and
> > don't have to deal with SQL all that much
> >
> >Well, even if you don't follow 'the proposed way' you have a chance to achieve these
> >goals :-)
> >This is just my opinion about the whole thing if you want to do it with
>JSP/Servlets.
> >It is certainly not the only way to go. Also there are still EJB and XML/XSL(T) and
> >....
> >
> >cheers,
> >
> >-hendrik
> >- - - - - - - - - - - - - - - - - - - - - - - - - - -
> > tagtraum industries http://www.tagtraum.com/
> > jo! small&smart 2.2 servletengine
> > Java Server & Servlets The web-application book
> > The WebApp Framework http://www.webapp.de/
> >
> >
> >Thang Nguyen wrote:
> >
> >> Hi,
> >>
> >> I have this fundalmental question. I hope you can shed some lights for me. I am
> >> looking to see what would be a common solution to my application.
> >>
> >> My project is a web based application which will retrieve values from the informix
> >> database, manupulate them, and send the results back to the requestors. As far as
> >> I understand, and was able to run a few examples, I noticed these:
> >>
> >> (1) JSP can use JDBC to communicate with database directly
> >> (2) Servlet can use JDBC to communicate with database directly
> >> (3) Service Beans can use JDBC to communicate with database directly
> >> (4) JSP can call Servlet as well as Java Bean
> >>
> >> So, what should I use, since the scope of this project can be larger? I am
> >> looking for these qualities: fast, easy to maintain, and simple.
> >>
> >> (1) just use JSP only, use HTML like tag for visual, and JDBDC directly
> >> for accessing database?
> >>
> >> or
> >> (2) use JSP and Servlets, use HTML like tag for visual, and Servlets (jdbc
> >> embeded) for accessing database?
> >>
> >> or
> >> (3) use JSP with Java Beans, use Visual Bean for visual and Service Bean
> >> (jdbc embeded) for accessing database.?
> >>
> >> Please help. Thank you very much for your time.
> >>
> >> TN
> >
> >===========================================================================
> >To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
> >Some relevant FAQs on JSP/Servlets can be found at:
> >
> > http://java.sun.com/products/jsp/faq.html
> > http://www.esperanto.org.nz/jsp/jspfaq.html
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> > http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
> ��
> ��
>
> ycd
> [EMAIL PROTECTED]
>
> ===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
