htmlreportservlet.java

利用jasperreports和Ireport做报表6

package net.ensode.jasperbook;

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

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

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.j2ee.servlets.ImageServlet;

public class HtmlReportServlet extends HttpServlet
{
  public static final String REPORT_DIRECTORY = "/reports";

  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException
  {
    ServletContext context = this.getServletConfig().getServletContext();
    String reportName = request.getParameter("reportName");
    File file = new File(context.getRealPath(REPORT_DIRECTORY + "/"
        + reportName + ".jrprint"));
    PrintWriter printWriter = response.getWriter();

    try
    {

      JasperPrint jasperPrint = (JasperPrint) JRLoader.loadObject(file
          .getPath());
      JRHtmlExporter htmlExporter = new JRHtmlExporter();

      response.setContentType("text/html");
      request.getSession().setAttribute(
          ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE, jasperPrint);

      htmlExporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
      htmlExporter.setParameter(JRExporterParameter.OUTPUT_WRITER, printWriter);
      htmlExporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,
          "image?image=");

      htmlExporter.exportReport();
    }
    catch (Throwable t)
    {
      // display stack trace in the browser
      t.printStackTrace(printWriter);
    }
  }
}