org.dbforms.servlets.reports
Class LineReportServletAbstract

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.dbforms.servlets.reports.ReportServletAbstract
              org.dbforms.servlets.reports.LineReportServletAbstract

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

Direct Known Subclasses:

CSVReportServlet, ExcelReportServlet

public abstract class LineReportServletAbstract
extends ReportServletAbstract

This servlet generates a comma separated values file (CSV). Data is read from the current dbForm, a Collection or a ResultSetVector The template file is in the reports directory with a .cr extension it consists of two lines of text, the first is a list of stirngs to use as header the second a list of comma separated field names. both lines must have the same number of elements. Normally the output file will use the first row as the headers. But if no header line is provided, then no headers are output and every row is data. usage: with a simple goto button: <db:gotoButton destTable="web_parts" destination=" /reports/Artikel"/> or for one record: <db:gotoButton destTable="web_parts" keyToDestPos="currentRow" destination="/reports/Artikel" /> Servlet mapping must be set to handle all /reports by this servlet!!! <servlet/> <servlet-name/>startreport</servlet-name/> <display-name/>startreport</display-name/> <servlet-class/>org.dbforms.StartReportServlet</servlet-class/> </servlet> <servlet-mapping/> <servlet-name/>startreport</servlet-name/> <url-pattern/>/reports/</url-pattern/> </servlet-mapping> web.xml optional parameters reportdirs list of directories to search for report file reportMimeType mime type to send to browser Parameters filename=xyz.csv name the output file Support for grabbing data from a Collection or an existing ResultSetVector set session variable "jasper.input" to use a Collection object set session variable "jasper.rsv" to use a ResultSetVector object ex <c:set var="jasper.rsv" value="${rsv_xxxxx}" scope="session" />

Author:

Neal Katz

See Also:

Serialized Form

Constructor Summary

LineReportServletAbstract()

Method Summary

protected abstract void	closeStream(OutputStream out)
protected abstract String	getFileExtension()
protected abstract String	getMimeType()
protected String	getReportFileExtension()
void	init() Initialize this servlet.
protected abstract void	openStream(OutputStream out)
protected ReportWriter	processReport(String reportFileFullName, JRDataSourceAbstract dataSource, ServletContext context, HttpServletRequest request, HttpServletResponse response) generates a report.
protected abstract void	writeData(Object[] data)
protected void	writeHeader(String[] header)

Methods inherited from class org.dbforms.servlets.reports.ReportServletAbstract

compileReport, doGet, doPost, handleException, process

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LineReportServletAbstract

public LineReportServletAbstract()

Method Detail

getMimeType

protected abstract String getMimeType()

getFileExtension

protected abstract String getFileExtension()

writeData

protected abstract void writeData(Object[] data)
                           throws Exception

Throws:

Exception

openStream

protected abstract void openStream(OutputStream out)
                            throws Exception

Throws:

Exception

closeStream

protected abstract void closeStream(OutputStream out)
                             throws Exception

Throws:

Exception

init

public void init()
          throws ServletException

Description copied from class: ReportServletAbstract

Initialize this servlet.

Overrides:

init in class ReportServletAbstract

Throws:

ServletException - if we cannot configure ourselves correctly

getReportFileExtension

protected String getReportFileExtension()

Specified by:

getReportFileExtension in class ReportServletAbstract

writeHeader

protected void writeHeader(String[] header)
                    throws Exception

Throws:

Exception

processReport

protected ReportWriter processReport(String reportFileFullName,
                                     JRDataSourceAbstract dataSource,
                                     ServletContext context,
                                     HttpServletRequest request,
                                     HttpServletResponse response)

generates a report.

Specified by:

processReport in class ReportServletAbstract

Parameters:

reportFileFullName - filename of report to process reportHTTPServletRequest generated by getReportFile! getReportFile should be called before fetching data, so that error handling of report not found e.g. could be processed first!

dataSource - data for the report

context - ServletContext

request - HTTPServletRequest

response - HTTPServletResponse