Relatorios com o Birt

Segue abaixo um HttpServlet responsável por interpretar arquivo de design do Birt, e exibi-los.
Futuramente irei demonstrar como alterar DataSource e DataSet em tempo de execuçao.

import org.eclipse.birt.report.engine.api.EngineConstants;
import org.eclipse.birt.report.engine.api.HTMLRenderContext;
import org.eclipse.birt.report.engine.api.HTMLRenderOption;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.model.api.ElementFactory;
import org.eclipse.birt.report.model.api.OdaDataSetHandle;
import org.eclipse.birt.report.model.api.OdaDataSourceHandle;
import org.eclipse.birt.report.model.api.ReportDesignHandle;
import org.eclipse.birt.report.model.api.activity.SemanticException;


import java.io.IOException;
import java.io.PrintWriter;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;

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


/**
* Class description
*
*/
public class BuildRelatorio extends HttpServlet {

/** Field description */
private static final long serialVersionUID = 1L;
protected static Logger   logger           =
    Logger.getLogger("org.eclipse.birt");

/**
 *
 */
private Connection currentConnection = null;

/**
 * Constructor of the object.
 */
private IReportEngine birtReportEngine = null;

/** Field description */
private ObjRelatorio ObjRel;


/**
 * Constructs ...
 *
 */
public BuildRelatorio() {
    super();
}

/**
 * Destruction of the servlet.
 *
 */
public void destroy() {
    super.destroy();
    BirtEngine.destroyBirtEngine();
}

/**
 * The doGet method of the servlet.
 *
 * @param req
 * @param resp
 * @throws ServletException
 * @throws IOException
 */
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" );
    ServletContext sc = req.getSession().
    getServletContext();

    this.birtReportEngine = BirtEngine.
    getBirtEngine(sc);

    // setup image directory
    HTMLRenderContext renderContext =
    new HTMLRenderContext();
    String  pastaImagens  = "pastaImagens";

    renderContext.setBaseImageURL(pastaImagens);
    renderContext.setImageDirectory(pastaImagens);
    logger.log(Level.FINE, pastaImagens);

    HashMap contextMap =
        new HashMap();

    contextMap.put(EngineConstants.
 APPCONTEXT_HTML_RENDER_CONTEXT, renderContext);

    IReportRunnable design;

    try {

        // Open report design
        String reportName = "N";

        design = birtReportEngine.
   openReportDesign(reportName);

 //Esta parte sera descrita em um post futuro        
 //designFactory(design);

        // create task to run and render report
        IRunAndRenderTask task =
            birtReportEngine.createRunAndRenderTask(
      design);

        task.setAppContext(contextMap);

        // set output options
        HTMLRenderOption options = new HTMLRenderOption();

        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);
    }
}

/**
 * The doPost method of the servlet.     *
 *
 * @param request
 * @param response
 * @throws ServletException
 * @throws IOException
 */
    public void doPost(HttpServletRequest request,
                     HttpServletResponse response)
          throws ServletException, IOException {
      response.setContentType("text/html");

      PrintWriter out = response.getWriter();

      out.println("CODIGOS HTML");
    
  }
/**
 * Initialization of the servlet.
 *
 *
 * @throws ServletException if an error occure
 */
public void init() throws ServletException {
    BirtEngine.initBirtConfig();
}
}