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servlets thread: Why I can't open my file?
Message #1 by Edward <zhangsc@n...> on Fri, 24 May 2002 13:56:33 +0800
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Edvard,
If wou want to load this file from subdirectory you can use
getClass().getResourceAsStream("data/error.txt")
regards,
Viktar
----- Original Message -----
From: "Viktar Duzh" <duzhv@s...>
To: "Servlets" <servlets@p...>
Sent: Friday, May 24, 2002 11:18 AM
Subject: [servlets] Re: Why I can't open my file?
> hi Edward,
>
> I guess You should use class loader of your GetUserIdentity.class to get
> resource error.txt.
>
> I've put error.txt file to classes directory and created class
>
> ------------------
> package com.any;
>
> import java.io.*;
>
> public class GetUserIdentity {
> public GetUserIdentity() {
> }
>
> public void readError() {
> ClassLoader classLoader = getClass().getClassLoader();
> System.out.println("class loader = " + classLoader);
>
> BufferedReader input = null;
> try {
> input = new BufferedReader(
> new
> InputStreamReader(classLoader.getResourceAsStream("error.txt")));
> System.out.println("input = " + input.readLine());
> } catch (Exception e) {
> System.out.println("error = " + e.toString());
> }
> }
> }
> ----------
>
> It's Ok.
>
> Viktar
>
> ----- Original Message -----
> From: "Edward" <zhangsc@n...>
> To: "Servlets" <servlets@p...>
> Sent: Friday, May 24, 2002 8:56 AM
> Subject: [servlets] Why I can't open my file?
>
>
> > I have a question about open file at same directory.I have some
> files,like follows:
> > D:\Apache Tomcat 4.0\webapps\login\WEB-INF\classes\GetUserIdentity.class
> > D:\Apache Tomcat 4.0\webapps\login\WEB-INF\classes\error.txt
> > The role of GetUserIdentity.class is read data from the file
> "error.txt",The file "GetUserIdentity.java" like:
> > ...
> > try
> > {
> > input=new BufferedReader(new FileReader("error.txt"));
> > ...
> > }
> > catch(IOException e)
> >
>
> > e.printStackTrace();
> > }
> >
> > But when I start Apache Tomcat 4.0,and I visit index.html which locate
> http://localhost:8080/login/servlets/index.html
> >
> > index.html is follows:
> > <html>
> > <head>
> > <title>Check Identity</title>
> > <STYLE>.red {background-color:red;}</STYLE>
> > </head>
> > <body>
> > <center>
> > <br><br>
> > <form action="http://localhost:8080/login/servlet/GetUserIdentity"
> method="POST">
> > <table align="center" width="%100" cellspacing="2"
cellpadding="2">
> > <tr>
> > <td align="right">Input ID </td>
> > <td><input type="Text" name="ID" align="left" size=15></td>
> > </tr>
> > <br><br><br>
> > <tr>
> > <td align="right">Input Password </td>
> > <td><input type="password" name="password" align="left"
size=15
> color="red"></td>
> > </tr>
> > </table>
> > <br><br>
> > <input type="Submit" name="okbutton" value=" OK " >
> > <input type="button" name="cancelbutton" value=" Cancel "
> onclick="window.close()">
> > </form>
> > </center>
> > </body>
> > <html>
> >
> > Then I click OK button,I got errors:
> >
> > Starting service Tomcat-Standalone
> > Apache Tomcat/4.0.1
> > Starting service Tomcat-Apache
> > Apache Tomcat/4.0.1
> > java.io.FileNotFoundException: error.txt
> > at java.io.FileInputStream.open(Native Method)
> > at java.io.FileInputStream.<init>(Unknown Source)
> > at java.io.FileReader.<init>(Unknown Source)
> > at PreReadError.<init>(PreReadError.java:22)
> > at GetUserIdentity.<init>(GetUserIdentity.java:20)
> > at java.lang.Class.newInstance0(Native Method)
> > at java.lang.Class.newInstance(Unknown Source)
> > at
> org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:82
> > 0)
> > at
> org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.jav
> > a:615)
> > at
> org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServl
> > et.java:396)
> > at
> org.apache.catalina.servlets.InvokerServlet.doPost(InvokerServlet.jav
> > a:216)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> > at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
> > icationFilterChain.java:247)
> > at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
> > ilterChain.java:193)
> > at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
> > alve.java:243)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:566)
> > at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
> > a:472)
> > at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> >
> > at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
> > alve.java:201)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:566)
> > at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
> > a:472)
> > at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> >
> > at
> org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
> > 2344)
> > at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
> > ava:164)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:566)
> > at
> org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
> > rValve.java:170)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:564)
> > at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
> > ava:170)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:564)
> > at
> org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:
> > 462)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:564)
> > at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
> > a:472)
> > at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> >
> > at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
> > ve.java:163)
> > at
> org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
> > .java:566)
> > at
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
> > a:472)
> > at
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
> >
> > at
> org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso
> > r.java:1011)
> > at
> org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja
> > va:1106)
> > at java.lang.Thread.run(Unknown Source)
> >
> > I have put GetUserIdentity.class and error.txt in same dictionary,but
why
> can't find it?
> > Any idea will be appreciated!
> > Edward
> >
>
>
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