ok Amit,
I have a class that's called XLReport implementing runnable.
and that's generating a report to a file on the system.
I have a report servlet that's doing the following :
//1. builds a random filename where the final report will be copied
String reportName=
this.cenProps.getProperty("webrootpath")+"/reports/"+login+(new
Date()).getTime() ;
//2. creates a XLReport object
XLReport threadedReport = new XLReport();
//3. set various params
threadedReport.setLogin(login) ;
threadedReport.setCriteriaQuery(criteriaQuery) ;
//4. set the target filename
threadedReport.setReportName(reportName) ;
//5. starts the generating
threadedReport.generate() ;
//6. redirect to the jsp (waiting.jsp) that will monitor the existence of
the file every 30 secs
res.sendRedirect("/cen/"+User.language(login)+"/waiting.jsp?target="+reportN
ame+".csv");
//7.finaly registers the report object seomewhere (in session) where it's
not going to be destroyed, there
//is probably a better solution, but that one works, unless the same user
genetares several reports,
//but in this case this system needs more modifications.
session.setAttribute("reporter",threadedReport);
The XLReport is not doing much :
public class XLReport implements Runnable {
//properties
private String criteriaQuery;
private String login;
private String reportName= null;
//setters
public void setCriteriaQuery( String value){
this.criteriaQuery=value;
}
public void setLogin( String value){
this.login=value;
}
public void setReportName( String value){
this.reportName =value;
}
/**
* empty constructor, does nothing
*/
public XLReport() {
}
/**
* main method to be called after setting the values,
* creates and starts the thread.
*/
public void generate(){
Thread myThread = new Thread(this);
myThread.start() ;
}
/**
* run method, generate the report in a temporary file and rename it when
finished,
* this is used in conjunction with another jsp or servlet to monitor if the
report
* is done or not.
*/
public void run(){
//rename file
tempFile.renameTo(targetFile);
tempFile=null;
targetFile=null;
}
}
Philippe Bertramo
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