RelatorioHtml.java

 
    /*
    *
    * Copyright (c) 2013 - 2014 INT - National Institute of Technology & COPPE - Alberto Luiz Coimbra Institute 
- Graduate School and Research in Engineering.
    * See the file license.txt for copyright permission.
    *
    */
        
     
package relatorio;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.faces.context.FacesContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.j2ee.servlets.ImageServlet;
import exception.relatorio.RelatorioException;

	
	public class RelatorioHtml {
		
		private String caminhoRelatorioHTML;

	    public RelatorioHtml() {
	    }

	    public RelatorioHtml(String pathRelatorioHTML) {
	        this.caminhoRelatorioHTML = pathRelatorioHTML;
	    }
	    
	    /**
	     * metodo responsavel pelo preenchimento do relatorio, a partir do arquivo jasper compilado, do nome do arquivo html, 
	     * e considerando os dados sob a forma de List e os par�metros 
	     * 
	     * @param nomeArquivo
	     * @param streamRelatorio
	     * @param parametros
	     * @param dados
	     * @throws RelatorioException
	     */
	    public void download(String nomeArquivo, InputStream streamRelatorio, Map parametros, List dados) throws RelatorioException {

	        String caminhoRelatorio = caminhoRelatorioHTML + nomeArquivo;
	        System.out.println("CAMINHO RELAT�RIO: " + caminhoRelatorio);

	        File relatorio = new File(caminhoRelatorio);
	        byte[] buffer = null;

	        try {
	            FacesContext context = FacesContext.getCurrentInstance();
	            HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
	            HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getResponse();

	            response.setContentType("application/octet-stream");
	            response.setHeader("Content-Disposition", "attachment;filename=\"" + nomeArquivo + "\"");

	            if (parametros == null) {
	                parametros = new HashMap();
	            }
	            
	            //Neste ponto, a nossa lista preenchida com o modelo � entregue ao Jasper, que cria um DataSource com ela
	            JRBeanCollectionDataSource dataSource = new JRBeanCollectionDataSource(dados);

	            //Aqui � onde ocorre de fato o preenchimento do relat�rio, com os par�metros e DataSource passados
	            JasperPrint impressao = JasperFillManager.fillReport(streamRelatorio, parametros, dataSource);

	            //Ponto onde o relat�rio com os dados montados � exportado para o formato HTML
	            JasperExportManager.exportReportToHtmlFile(impressao, caminhoRelatorio);

	            FileInputStream fis = new FileInputStream(relatorio);
	            OutputStream os = response.getOutputStream();
	            
	            response.setContentType("text/html");
				
	            JRHtmlExporter htmlExporter = new JRHtmlExporter();
	            
				request.getSession().setAttribute(ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, impressao);
				htmlExporter.setParameter(JRExporterParameter.JASPER_PRINT, impressao);
				htmlExporter.setParameter(JRExporterParameter.OUTPUT_WRITER, os);
				htmlExporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "/gesplan/image?image=");
				htmlExporter.exportReport();

	            int read = 0;
	            buffer = new byte[1024];

	            while ((read = fis.read(buffer)) != -1) {
	                os.write(buffer, 0, read);
	            }
	            
	            os.flush();
	            os.close();
	            fis.close();

	            FacesContext.getCurrentInstance().responseComplete();

	        } catch (Throwable ex) {
	            ex.printStackTrace();
	            throw new RelatorioException(ex);
	        } finally {
	            buffer = null;
	        }
	    }

	}