怎么在java web 中通过action调用ireport

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.bitsperu.academia.reporte;
import com.bitsperu.academia.utilidades.DAO.DAO;
import java.io.IOException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.sql.Connection;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.*;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.util.JRLoader;/**
 *
 * @author carlos
 */
public class Matricula extends HttpServlet {    protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("application/pdf");
        ServletOutputStream out = response.getOutputStream();
        Connection cn = DAO.getConexion();        try {
            JasperReport reporte = (JasperReport) JRLoader.loadObject(getServletContext().getRealPath("app/matricula/matricula_byid.jasper"));            Map parametros = new HashMap();
            parametros.put("id", request.getParameter("id"));
            //parametros.put("ot_entidad_id", request.getSession().getAttribute("ot_entidad_id"));
            JasperPrint jasperPrint = JasperFillManager.fillReport(reporte, parametros, cn);            JRExporter exporter = new JRPdfExporter();
            exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, out);
            exporter.exportReport();        } catch (Exception e) {
            e.printStackTrace();
        }
    }    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        processRequest(request, response);
    }    @Override
    public String getServletInfo() {
        return "Short description";
    }
}