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ServletContext.getResource
Posted on 2011-03-16
Under Tomcat, we initialize some values based on the contents of a directory contained in an unexploded WAR file.
To do this, the code gets a URL by issuing a servletContext.getResource
With the URL, we do a "getContent", which returns an object with class "javax.naming.directory.Di
When deployed under weblogic 9.2, the "getContent" returns a plain text object, which appears to be useless for our purposes.
Is there an appserver-independent way of getting a directory of files from an unexploded war file?
To do this, the code gets a URL by issuing a servletContext.getResource
With the URL, we do a "getContent", which returns an object with class "javax.naming.directory.Di
When deployed under weblogic 9.2, the "getContent" returns a plain text object, which appears to be useless for our purposes.
Is there an appserver-independent way of getting a directory of files from an unexploded war file?
URL theFolderUrl = Z.context.getResource(tabCornerDir);
if (theFolderUrl == null) return tabColorGifs;
javax.naming.directory.DirContext jndd = (javax.naming.directory.DirContext)theFolderUrl.getContent();
//This last line produces a ClassCastException under weblogic
'weblogic.kernel.Default (self-tuning)' Exception =
java.lang.ClassCastException: sun.net.www.content.text.PlainTextInputStream
cannot be cast to javax.naming.directory.DirContext
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1 Comment
Okay. With no answers forthcoming, I did some analysis and testing and discovered the following.
If the content type is plain text for a directory (as it is under weblogic), you can get the content of the url as an InputStream and read it.
I found that the InputStream returns a line (terminated by cr-lf) for each filename entry in the directory.
This turned out to be sufficient for my needs, so now the code parses the content in two ways:
1. as a directory under tomcat, and
2. as a plain text input stream under weblogic
I assume it is JRockit that is responsible for this rather odd content delivery, which could be considered a bug.
See the attached code snippet for details.
If the content type is plain text for a directory (as it is under weblogic), you can get the content of the url as an InputStream and read it.
I found that the InputStream returns a line (terminated by cr-lf) for each filename entry in the directory.
This turned out to be sufficient for my needs, so now the code parses the content in two ways:
1. as a directory under tomcat, and
2. as a plain text input stream under weblogic
I assume it is JRockit that is responsible for this rather odd content delivery, which could be considered a bug.
See the attached code snippet for details.
URLConnection uc = theFolderUrl.openConnection();
Z.log.writeToLog(Z.log.DEBUG, "TD: resource type/length is:" + uc.getContentType() + "/" + uc.getContentLength());
InputStream is = uc.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "UTF-8");
BufferedReader br = new BufferedReader(isr);
int fileCount = 0;
while (true) {
try {
String fileName = br.readLine();
fileCount++;
//Z.log.writeToLog(Z.log.INFO, "TD: collected filename=" + fileName);
if (fileName == null || fileCount > 500 ) break;
theGifs.add(fileName);
} catch(Exception e) {
ErrorWriter.write(e, ErrorWriter.LOG);
break;
}
}
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