Equipos, Materiales, Programas y Recursos:
- PC con Sistema Operativo con soporte a Java.
- IDE para Java
- Navegador Web (recomendable Firefox)
- Contenedor de Servlets (recomendable Tomcat)
Procedimiento y Resultados:
1. Preparar el código en jsf
<!DOCTYPE html PUBLIC "-//W3C//DTD
XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:opt="http://primefaces.prime.com.tr/optimus">
<ui:composition template="/WEB-INF/plantillas/plantilla.xhtml">
<ui:define name="contenido">
<h:form style="margin-bottom: 8px">
<p:commandButton action="#{alumnoBean.imprimir()}"
value="Reporte"
icon="icon-report" ajax="false">
</p:commandButton>
</h:form>
</ui:define>
</ui:composition>
</html>
2. Crear una Clase llamada AlumnoBean
package org.login.managedbeans;
import
java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.text.DateFormat;
import
java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import
javax.faces.bean.ManagedBean;
import
javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import
javax.servlet.ServletOutputStream;
import
javax.servlet.http.HttpServletResponse;
import org.login.beans.Alumno;
import org.login.dao.AlumnoDao;
import
org.login.utils.FacesUtils;
import
com.itextpdf.text.BaseColor;
import
com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import
com.itextpdf.text.FontFactory;
import
com.itextpdf.text.PageSize;
import
com.itextpdf.text.pdf.PdfPCell;
import
com.itextpdf.text.pdf.PdfPTable;
import
com.itextpdf.text.pdf.PdfWriter;
import
com.itextpdf.text.Paragraph;
import
org.primefaces.context.RequestContext;
@ManagedBean
@SessionScoped
public class AlumnoBean implements Serializable {
private static final long serialVersionUID = 1L;
private Alumno alumno;
private List<Alumno> alumnos;
private AlumnoDao alumnoDao;
public AlumnoBean() {
alumno = new Alumno();
}
public Alumno getAlumno() {
return alumno;
}
public void setAlumno(Alumno alumno) {
this.alumno = alumno;
}
public List<Alumno> getAlumnos() {
alumnoDao = new AlumnoDao();
alumnos = alumnoDao.buscarTodos();
return alumnos;
}
}
public void imprimir() {
Document document
= new Document(PageSize.LETTER);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
PdfWriter.getInstance(document, baos);
//METADATA
AlumnoDao alumnodaos = new AlumnoDao();
List<Alumno> alList =
alumnodaos.buscarTodos();
document.open();
document.add(new Paragraph(" ESTUDIANTES INSCRITOS \n"));
DateFormat formatter= new SimpleDateFormat("dd/MM/yy '-'
hh:mm:ss:");
Date currentDate = new Date();
String date = formatter.format(currentDate);
document.add(new Paragraph("Fecha Generado: "+date));
document.add(new Paragraph("\n"));
PdfPTable table = new PdfPTable(6);
table.setTotalWidth(new float[]{ 20,72, 110, 95, 170, 72
});
table.setLockedWidth(true);
PdfPCell cell = new PdfPCell(new Paragraph("Listado de ALumnos" ,
FontFactory.getFont("arial",
// fuente
8, // tamaño
Font.BOLD, // estilo
BaseColor.MAGENTA)));
cell.setHorizontalAlignment(Element.ALIGN_CENTER);
cell.setBackgroundColor(BaseColor.GRAY);
cell.setColspan(6);
table.addCell(cell);
cell = new PdfPCell(new Paragraph ("ID", FontFactory.getFont("arial",8,Font.BOLD,BaseColor.GRAY )));
table.addCell("Paterno");
table.addCell("Materno");
table.addCell("Nombre");
table.addCell("Correo");
table.addCell("Dni");
for (int i = 0; i <
alList.size(); i++) {
Alumno id = alList.get(i);
table.addCell(id.getId().toString());
cell.setBackgroundColor(BaseColor.LIGHT_GRAY);
table.addCell(id.getPaterno());
table.addCell(id.getMaterno());
table.addCell(id.getNombres());
table.addCell(id.getCorreo());
table.addCell(id.getDni());
}
document.add(table);
} catch
(Exception ex) {
System.out.println("Error " + ex.getMessage());
}
document.close();
FacesContext context = FacesContext.getCurrentInstance();
Object response =
context.getExternalContext().getResponse();
if (response instanceof HttpServletResponse) {
HttpServletResponse hsr = (HttpServletResponse)
response;
hsr.setContentType("application/pdf");
hsr.setHeader("Content-disposition", "attachment");
hsr.setContentLength(baos.size());
try {
ServletOutputStream out =
hsr.getOutputStream();
baos.writeTo(out);
out.flush();
} catch
(IOException ex) {
System.out.println("Error:
" +
ex.getMessage());
}
context.responseComplete();
}
}
public void reset() {
RequestContext.getCurrentInstance().reset("formEditar:panel");
}
}
3. Resultado
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