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Java - Dynamic Report Servlet (BIRT)

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Dynamic Report Servlet

This example demonstrate using the DE API to add a table to an existing report or template while running it within a servlet. This example should be setup as described in the Report Engine API Servlet Example. This class should replace the WebReport class. Add comments at the bottom of the example.

Moved from the old examples area: BIRT Design Engine API



Place this file in the webapps/DynamicReport directory.

	The Query that is used for this example is Select * From OFFICES
		<form id="form1" method="get" action="http://localhost:8080/DynamicReport/run">
			<select name="dyna1" multiple size="8" >
				<option value="COUNTRY">COUNTRY</option>
				<option value="CITY">CITY</option>
				<option value="STATE">STATE</option>
				<option value="OFFICECODE">OFFICECODE</option>	
				<option value="ADDRESSLINE1">ADDRESSLINE1</option>	
				<option value="ADDRESSLINE2">ADDRESSLINE2</option>
				<option value="POSTALCODE">POSTALCODE</option>	
				<option value="TERRITORY">TERRITORY</option>			
<INPUT TYPE="SUBMIT" VALUE="Run Dynamic Report"> <INPUT TYPE="HIDDEN" NAME="ReportName" Value="DynamicTableExample.rpttemplate"> </form> </body> </html>


import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.birt.report.engine.api.EngineConstants;
import org.eclipse.birt.report.engine.api.HTMLRenderOption;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.model.api.CellHandle;
import org.eclipse.birt.report.model.api.DataItemHandle;
import org.eclipse.birt.report.model.api.ElementFactory;
import org.eclipse.birt.report.model.api.LabelHandle;
import org.eclipse.birt.report.model.api.OdaDataSetHandle;
import org.eclipse.birt.report.model.api.OdaDataSourceHandle;
import org.eclipse.birt.report.model.api.PropertyHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.RowHandle;
import org.eclipse.birt.report.model.api.StructureFactory;
import org.eclipse.birt.report.model.api.TableHandle;
import org.eclipse.birt.report.model.api.activity.SemanticException;
import org.eclipse.birt.report.model.api.elements.structures.ComputedColumn; 
import org.eclipse.birt.report.engine.api.HTMLServerImageHandler;

public class DynamicReport extends HttpServlet {

	private static final long serialVersionUID = 1L;
	 * Constructor of the object.
	private IReportEngine birtReportEngine = null;
	protected static Logger logger = Logger.getLogger( "org.eclipse.birt" );
	public DynamicReport() {

	 * Destruction of the servlet. 
*/ public void destroy() { super.destroy(); BirtEngine.destroyBirtEngine(); } /** * The doGet method of the servlet.
* */ public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //get report name and launch the engine resp.setContentType("text/html"); //resp.setContentType( "application/pdf" ); //resp.setHeader ("Content-Disposition","inline; filename=test.pdf"); String reportName = req.getParameter("ReportName"); String[] cols = (String[])req.getParameterMap().get("dyna1"); ServletContext sc = req.getSession().getServletContext(); this.birtReportEngine = BirtEngine.getBirtEngine(sc); IReportRunnable design; try { //Open report design design = birtReportEngine.openReportDesign( sc.getRealPath("/Reports")+"/"+reportName ); ReportDesignHandle report = (ReportDesignHandle) design.getDesignHandle( ); buildReport( cols, report ); //create task to run and render report IRunAndRenderTask task = birtReportEngine.createRunAndRenderTask( design ); task.setAppContext( contextMap ); //set output options HTMLRenderOption options = new HTMLRenderOption(); options.setImageHandler( new HTMLServerImageHandler() ); options.setImageDirectory( sc.getRealPath("/images"); options.setBaseImageURL( req.getContextPath() + "/images" ); options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML); //options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_PDF); options.setOutputStream(resp.getOutputStream()); task.setRenderOption(options); //run report task.run(); task.close(); }catch (Exception e){ e.printStackTrace(); throw new ServletException( e ); } } public void buildReport(String[] cols, ReportDesignHandle designHandle){ try{ ElementFactory designFactory = designHandle.getElementFactory( ); buildDataSource(designFactory, designHandle); //ArrayList cols = new ArrayList(); //cols.add("OFFICECODE"); //cols.add("CITY"); //cols.add("COUNTRY"); buildDataSet(cols, "From Offices", designFactory, designHandle); TableHandle table = designFactory.newTableItem( "table", cols.length ); table.setWidth( "100%" ); table.setDataSet( designHandle.findDataSet( "ds" ) ); PropertyHandle computedSet = table.getColumnBindings( ); ComputedColumn cs1 = null; for( int i=0; i < cols.length; i++){ cs1 = StructureFactory.createComputedColumn(); cs1.setName((String)cols[i]); cs1.setExpression("dataSetRow[\"" + (String)cols[i] + "\"]"); computedSet.addItem(cs1); } // table header RowHandle tableheader = (RowHandle) table.getHeader( ).get( 0 ); for( int i=0; i < cols.length; i++){ LabelHandle label1 = designFactory.newLabel( (String)cols[i] ); label1.setText((String)cols[i]); CellHandle cell = (CellHandle) tableheader.getCells( ).get( i ); cell.getContent( ).add( label1 ); } // table detail RowHandle tabledetail = (RowHandle) table.getDetail( ).get( 0 ); for( int i=0; i < cols.length; i++){ CellHandle cell = (CellHandle) tabledetail.getCells( ).get( i ); DataItemHandle data = designFactory.newDataItem( "data_"+(String)cols[i] ); data.setResultSetColumn( (String)cols[i]); cell.getContent( ).add( data ); } designHandle.getBody( ).add( table ); }catch(Exception e){ e.printStackTrace(); } } void buildDataSource( ElementFactory designFactory, ReportDesignHandle designHandle ) throws SemanticException { OdaDataSourceHandle dsHandle = designFactory.newOdaDataSource( "Data Source", "org.eclipse.birt.report.data.oda.jdbc" ); dsHandle.setProperty( "odaDriverClass", "org.eclipse.birt.report.data.oda.sampledb.Driver" ); dsHandle.setProperty( "odaURL", "jdbc:classicmodels:sampledb" ); dsHandle.setProperty( "odaUser", "ClassicModels" ); dsHandle.setProperty( "odaPassword", "" ); designHandle.getDataSources( ).add( dsHandle ); } void buildDataSet(String[] cols, String fromClause, ElementFactory designFactory, ReportDesignHandle designHandle ) throws SemanticException { OdaDataSetHandle dsHandle = designFactory.newOdaDataSet( "ds", "org.eclipse.birt.report.data.oda.jdbc.JdbcSelectDataSet" ); dsHandle.setDataSource( "Data Source" ); String qry = "Select "; for( int i=0; i < cols.length; i++){ qry += " " + cols[i]; if( i != (cols.length -1) ){ qry += ","; } } qry += " " + fromClause; dsHandle.setQueryText( qry ); designHandle.getDataSets( ).add( dsHandle ); } /** * The doPost method of the servlet.
* */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.println(" Post Not Supported"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * Initialization of the servlet.
* * @throws ServletException if an error occure */ public void init() throws ServletException { BirtEngine.initBirtConfig(); } }


<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"





Example Report Template

Example Report Template


Please enter comments below by selecting the edit icon to the right. You will need a Bugzilla account to add comments.

Thank you for this splendid example! This is what I have been looking for. For the range of issues this explains, it's worth more than the entire Integrating and Extending BIRT book. Thank you!

The code uses the class BirtEngine (e.g. in the destroy() method), but its not imported - where is it from?

  Answer: There is a BirtReport.zip example floating around this wiki. It includes the BirtReport.java engine. You should find that and it's pretty much complete.


Take a look at Servlet Example