I am not aware if the issue has been solved by others, but when I tried to
use JasperReportViewServlet for displaying charts/images in html files, it
didn't work. Then I checked the source code, there is a line marked "// todo
fixme... currently not working...". After exploring more on Jasper report
document, I got the problem solved. Basically we need to load images from
IMAGES_MAP. The following is the modified code. Anybody can check the code
and compile it into the lib?
Thanks.
Manyuan Jin
/*
* Copyright (c) 2002-2003 by OpenSymphony
* All rights reserved.
*/
package com.opensymphony.webwork.views.jasperreports;
import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.util.OgnlValueStack;
import dori.jasper.engine.*;
import dori.jasper.engine.export.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
* Provide a view of a webwork action as a jasper report. The report format
will be determined by
* the format parameter passed in the xwork action definition.
* Example action definition:
*
* <action name="jasperTest"
class="com.opensymphony.webwork.views.jasperreports.example.OrderListAction"
>
* <param name="dataSource">orders</param>
* <param name="format">PDF</param>
* <result name="success" type="dispatcher">
* <param name="location">orderList.jasper</param>
* </result>
* <interceptor-ref name="defaultStack"/>
* </action>
*
* Valid report format strings are the following:
* <ul>
* <li>PDF</li>
* <li>XML</li>
* <li>HTML</li>
* <li>XLS</li>
* <li>CSV</li>
* </ul>
* It will then look for a compiled report definition of the form
<code><view name>.jasper</code>,
* run it to the appropriate output format and stream the results as the
HTTP response.
*
* Ported to WebWork2:
*
* @author <a href="[EMAIL PROTECTED]">Rainer Hermanns</a>
* @version $Id: JasperReportViewServlet.java,v 1.1 2003/10/03 05:45:27
cameronbraid Exp $
*/
public class JasperReportViewServlet extends HttpServlet implements
JasperReportConstants {
//~ Static fields/initializers
/////////////////////////////////////////////
protected static Log log =
LogFactory.getLog(JasperReportViewServlet.class);
//~ Instance fields
////////////////////////////////////////////////////////
protected String IMAGES_URI = "/images/";
//~ Methods
////////////////////////////////////////////////////////////////
/* (non-Javadoc)
* @see javax.servlet.GenericServlet#init()
*/
public void init() throws ServletException {
super.init();
if (getServletConfig().getInitParameter("IMAGES_URI") != null) {
IMAGES_URI = getServletConfig().getInitParameter("IMAGES_URI");
}
}
/**
* Service a HTTP request
* @param request the request to service
* @param response the response to send to the client
*/
public void service(HttpServletRequest request, HttpServletResponse
response) throws ServletException {
String imageName=request.getParameter("image");
//load image from IMAGES_MAP
if(imageName !=null){
Map imagesMap = (Map)
request.getSession().getAttribute("IMAGES_MAP");
if (imagesMap != null){
byte[] imageData = (byte[]) imagesMap.get(imageName);
try{
response.setContentLength(imageData.length);
ServletOutputStream ouputStream = response.getOutputStream();
ouputStream.write(imageData, 0, imageData.length);
ouputStream.flush();
ouputStream.close();
}
catch(IOException ioe){
log.warn(ioe.toString());
}
}
}
else{
//construct the data source for the report
OgnlValueStack stack =
ServletActionContext.getContext().getValueStack();
String dataSource = "" + request.getAttribute("dataSource");
OgnlValueStackDataSource stackDataSource = new
OgnlValueStackDataSource(stack, dataSource);
//get the output format
String outputFormat = "" + request.getAttribute("format");
// (Map) ActionContext.getContext().getSession().get("IMAGES_MAP");
if (outputFormat == null) {
outputFormat = FORMAT_PDF;
}
if (!"contype".equals(request.getHeader("User-Agent"))) {
// Determine the directory that the report file is in and set
the reportDirectory parameter
String systemId =
getServletContext().getRealPath(request.getServletPath());
Map parameters = new OgnlValueStackShadowMap(stack);
File directory = new File(systemId.substring(0,
systemId.lastIndexOf(File.separator)));
parameters.put("reportDirectory", directory);
byte[] output = null;
JasperPrint jasperPrint = null;
// Fill the report and produce a print object
try {
JasperReport jasperReport =
JasperManager.loadReport(systemId);
jasperPrint = JasperFillManager.fillReport(jasperReport,
parameters, stackDataSource);
} catch (JRException e) {
log.error("Error building report for uri " + systemId, e);
throw new ServletException(e.getMessage(), e);
}
// Export the print object to the desired output format
try {
if (outputFormat.equals(FORMAT_PDF)) {
response.setContentType("application/pdf");
// response.setHeader("Content-disposition", "inline;
filename=report.pdf");
output =
JasperExportManager.exportReportToPdf(jasperPrint);
} else {
JRExporter exporter = null;
if (outputFormat.equals(FORMAT_CSV)) {
response.setContentType("text/plain");
exporter = new JRCsvExporter();
} else if (outputFormat.equals(FORMAT_HTML)) {
response.setContentType("text/html");
Map imagesMap = new HashMap();
request.getSession().setAttribute("IMAGES_MAP",
imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI,
"*.jasper?image=");
} else if (outputFormat.equals(FORMAT_XLS)) {
response.setContentType("application/vnd.ms-excel");
exporter = new JRXlsExporter();
} else if (outputFormat.equals(FORMAT_XML)) {
response.setContentType("text/xml");
exporter = new JRXmlExporter();
} else {
throw new ServletException("Unknown report format: "
+ outputFormat);
}
output = exportReportToBytes(jasperPrint, exporter);
}
} catch (JRException e) {
String message = "Error producing " + outputFormat + "
report for uri " + systemId;
log.error(message, e);
throw new ServletException(e.getMessage(), e);
}
response.setContentLength(output.length);
ServletOutputStream ouputStream;
try {
if (log.isDebugEnabled()) {
//log.debug("Writing " + output.length + " bytes to
output stream");
}
ouputStream = response.getOutputStream();
ouputStream.write(output);
ouputStream.flush();
ouputStream.close();
} catch (IOException e) {
log.error("Error writing report output", e);
throw new ServletException(e.getMessage(), e);
}
} else {
// Code to handle "contype" request from IE
try {
ServletOutputStream outputStream;
response.setContentType("application/pdf");
response.setContentLength(0);
outputStream = response.getOutputStream();
outputStream.close();
} catch (IOException e) {
log.error("Error writing report output", e);
throw new ServletException(e.getMessage(), e);
}
}
}
}
/**
* Run a Jasper report to CSV format and put the results in a byte array
* @param jasperPrint The Print object to render as CSV
* @param exporter The exporter to use to export the report
* @return A CSV formatted report
* @throws dori.jasper.engine.JRException If there is a problem running
the report
*/
private byte[] exportReportToBytes(JasperPrint jasperPrint, JRExporter
exporter) throws JRException {
byte[] output;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
exporter.setParameter(JRExporterParameter.JASPER_PRINT,
jasperPrint);
exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, baos);
exporter.exportReport();
output = baos.toByteArray();
return output;
}
}
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