Struts example source code file (JasperReportsResult.java)
The Struts JasperReportsResult.java source code/*
* $Id: JasperReportsResult.java 1076544 2011-03-03 07:19:37Z lukaszlenart $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts2.views.jasperreports;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporter;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JRParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.export.JRCsvExporter;
import net.sf.jasperreports.engine.export.JRCsvExporterParameter;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.export.JRRtfExporter;
import net.sf.jasperreports.engine.export.JRXlsExporter;
import net.sf.jasperreports.engine.export.JRXmlExporter;
import net.sf.jasperreports.engine.util.JRLoader;
import org.apache.commons.lang.StringUtils;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.StrutsResultSupport;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.sql.Connection;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;
/**
* <!-- START SNIPPET: description -->
* <p/>
* Generates a JasperReports report using the specified format or PDF if no
* format is specified.
* <p/>
* <!-- END SNIPPET: description -->
* <p />
* <b>This result type takes the following parameters:
* <p/>
* <!-- START SNIPPET: params -->
* <p/>
* <ul>
* <p/>
* <li>location (default) - the location where the compiled jasper report
* definition is (foo.jasper), relative from current URL.</li>
* <p/>
* <li>dataSource (required) - the EL expression used to retrieve the
* datasource from the value stack (usually a List).</li>
* <p/>
* <li>parse - true by default. If set to false, the location param will
* not be parsed for EL expressions.</li>
* <p/>
* <li>format - the format in which the report should be generated. Valid
* values can be found in {@link JasperReportConstants}. If no format is
* specified, PDF will be used.</li>
* <p/>
* <li>contentDisposition - disposition (defaults to "inline", values are
* typically <i>filename="document.pdf").
* <p/>
* <li>documentName - name of the document (will generate the http header
* <code>Content-disposition = X; filename=X.[format]).
* <p/>
* <li>delimiter - the delimiter used when generating CSV reports. By
* default, the character used is ",".</li>
* <p/>
* <li>imageServletUrl - name of the url that, when prefixed with the
* context page, can return report images.</li>
* <p/>
* <li>
* <b>reportParameters - (2.1.2+) OGNL expression used to retrieve a map of
* report parameters from the value stack. The parameters may be accessed
* in the report via the usual JR mechanism and might include data not
* part of the dataSource, such as the user name of the report creator, etc.
* </li>
* <p/>
* <li>
* <b>exportParameters - (2.1.2+) OGNL expression used to retrieve a map of
* JR exporter parameters from the value stack. The export parameters are
* used to customize the JR export. For example, a PDF export might enable
* encryption and set the user password to a string known to the report creator.
* </li>
* <p/>
* <li>
* <b>connection - (2.1.7+) JDBC Connection which can be passed to the
* report instead of dataSource
* </li>
* <p/>
* </ul>
* <p/>
* <p>
* This result follows the same rules from {@link StrutsResultSupport}.
* Specifically, all parameters will be parsed if the "parse" parameter
* is not set to false.
* </p>
* <!-- END SNIPPET: params -->
* <p/>
* <b>Example:
* <p/>
* <pre>
* <result name="success" type="jasper">
* <param name="location">foo.jasper</param>
* <param name="dataSource">mySource</param>
* <param name="format">CSV</param>
* </result>
* <!-- END SNIPPET: example1 -->
* or for pdf
* <pre>
* <result name="success" type="jasper">
* <param name="location">foo.jasper</param>
* <param name="dataSource">mySource</param>
* </result>
* <!-- END SNIPPET: example2 -->
*/
public class JasperReportsResult extends StrutsResultSupport implements JasperReportConstants {
private static final long serialVersionUID = -2523174799621182907L;
private final static Logger LOG = LoggerFactory.getLogger(JasperReportsResult.class);
protected String dataSource;
protected String format;
protected String documentName;
protected String contentDisposition;
protected String delimiter;
protected String imageServletUrl = "/images/";
protected String timeZone;
/**
* Connection which can be passed to the report
* instead od dataSource.
*/
protected String connection;
/**
* Names a report parameters map stack value, allowing
* additional report parameters from the action.
*/
protected String reportParameters;
/**
* Names an exporter parameters map stack value,
* allowing the use of custom export parameters.
*/
protected String exportParameters;
/**
* Default ctor.
*/
public JasperReportsResult() {
super();
}
/**
* Default ctor with location.
*
* @param location Result location.
*/
public JasperReportsResult(String location) {
super(location);
}
public String getImageServletUrl() {
return imageServletUrl;
}
public void setImageServletUrl(final String imageServletUrl) {
this.imageServletUrl = imageServletUrl;
}
public void setDataSource(String dataSource) {
this.dataSource = dataSource;
}
public void setFormat(String format) {
this.format = format;
}
public void setDocumentName(String documentName) {
this.documentName = documentName;
}
public void setContentDisposition(String contentDisposition) {
this.contentDisposition = contentDisposition;
}
public void setDelimiter(String delimiter) {
this.delimiter = delimiter;
}
/**
* set time zone id
*
* @param timeZone
*/
public void setTimeZone(final String timeZone) {
this.timeZone = timeZone;
}
public String getReportParameters() {
return reportParameters;
}
public void setReportParameters(String reportParameters) {
this.reportParameters = reportParameters;
}
public String getExportParameters() {
return exportParameters;
}
public void setExportParameters(String exportParameters) {
this.exportParameters = exportParameters;
}
public String getConnection() {
return connection;
}
public void setConnection(String connection) {
this.connection = connection;
}
protected void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
// Will throw a runtime exception if no "datasource" property. TODO Best place for that is...?
initializeProperties(invocation);
if (LOG.isDebugEnabled()) {
LOG.debug("Creating JasperReport for dataSource = " + dataSource + ", format = " + format);
}
HttpServletRequest request = (HttpServletRequest) invocation.getInvocationContext().get(ServletActionContext.HTTP_REQUEST);
HttpServletResponse response = (HttpServletResponse) invocation.getInvocationContext().get(ServletActionContext.HTTP_RESPONSE);
// Handle IE special case: it sends a "contype" request first.
// TODO Set content type to config settings?
if ("contype".equals(request.getHeader("User-Agent"))) {
try {
response.setContentType("application/pdf");
response.setContentLength(0);
ServletOutputStream outputStream = response.getOutputStream();
outputStream.close();
} catch (IOException e) {
LOG.error("Error writing report output", e);
throw new ServletException(e.getMessage(), e);
}
return;
}
// Construct the data source for the report.
ValueStack stack = invocation.getStack();
ValueStackDataSource stackDataSource = null;
Connection conn = (Connection) stack.findValue(connection);
if (conn == null)
stackDataSource = new ValueStackDataSource(stack, dataSource);
// Determine the directory that the report file is in and set the reportDirectory parameter
// For WW 2.1.7:
// ServletContext servletContext = ((ServletConfig) invocation.getInvocationContext().get(ServletActionContext.SERVLET_CONFIG)).getServletContext();
ServletContext servletContext = (ServletContext) invocation.getInvocationContext().get(ServletActionContext.SERVLET_CONTEXT);
String systemId = servletContext.getRealPath(finalLocation);
Map parameters = new ValueStackShadowMap(stack);
File directory = new File(systemId.substring(0, systemId.lastIndexOf(File.separator)));
parameters.put("reportDirectory", directory);
parameters.put(JRParameter.REPORT_LOCALE, invocation.getInvocationContext().getLocale());
// put timezone in jasper report parameter
if (timeZone != null) {
timeZone = conditionalParse(timeZone, invocation);
final TimeZone tz = TimeZone.getTimeZone(timeZone);
if (tz != null) {
// put the report time zone
parameters.put(JRParameter.REPORT_TIME_ZONE, tz);
}
}
// Add any report parameters from action to param map.
Map reportParams = (Map) stack.findValue(reportParameters);
if (reportParams != null) {
LOG.debug("Found report parameters; adding to parameters...");
parameters.putAll(reportParams);
}
byte[] output;
JasperPrint jasperPrint;
// Fill the report and produce a print object
try {
JasperReport jasperReport = (JasperReport) JRLoader.loadObject(systemId);
if (conn == null)
jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, stackDataSource);
else
jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, conn);
} 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 (contentDisposition != null || documentName != null) {
final StringBuffer tmp = new StringBuffer();
tmp.append((contentDisposition == null) ? "inline" : contentDisposition);
if (documentName != null) {
tmp.append("; filename=");
tmp.append(documentName);
tmp.append(".");
tmp.append(format.toLowerCase());
}
response.setHeader("Content-disposition", tmp.toString());
}
JRExporter exporter;
if (format.equals(FORMAT_PDF)) {
response.setContentType("application/pdf");
exporter = new JRPdfExporter();
} else if (format.equals(FORMAT_CSV)) {
response.setContentType("text/plain");
exporter = new JRCsvExporter();
} else if (format.equals(FORMAT_HTML)) {
response.setContentType("text/html");
// IMAGES_MAPS seems to be only supported as "backward compatible" from JasperReports 1.1.0
Map imagesMap = new HashMap();
request.getSession(true).setAttribute("IMAGES_MAP", imagesMap);
exporter = new JRHtmlExporter();
exporter.setParameter(JRHtmlExporterParameter.IMAGES_MAP, imagesMap);
exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, request.getContextPath() + imageServletUrl);
// Needed to support chart images:
exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
request.getSession().setAttribute("net.sf.jasperreports.j2ee.jasper_print", jasperPrint);
} else if (format.equals(FORMAT_XLS)) {
response.setContentType("application/vnd.ms-excel");
exporter = new JRXlsExporter();
} else if (format.equals(FORMAT_XML)) {
response.setContentType("text/xml");
exporter = new JRXmlExporter();
} else if (format.equals(FORMAT_RTF)) {
response.setContentType("application/rtf");
exporter = new JRRtfExporter();
} else {
throw new ServletException("Unknown report format: " + format);
}
Map exportParams = (Map) stack.findValue(exportParameters);
if (exportParams != null) {
LOG.debug("Found export parameters; adding to exporter parameters...");
exporter.getParameters().putAll(exportParams);
}
output = exportReportToBytes(jasperPrint, exporter);
} catch (JRException e) {
String message = "Error producing " + format + " report for uri " + systemId;
LOG.error(message, e);
throw new ServletException(e.getMessage(), e);
}
response.setContentLength(output.length);
// Will throw ServletException on IOException.
writeReport(response, output);
}
/**
* Writes report bytes to response output stream.
*
* @param response Current response.
* @param output Report bytes to write.
* @throws ServletException on stream IOException.
*/
private void writeReport(HttpServletResponse response, byte[] output) throws ServletException {
ServletOutputStream outputStream = null;
try {
outputStream = response.getOutputStream();
outputStream.write(output);
outputStream.flush();
} catch (IOException e) {
LOG.error("Error writing report output", e);
throw new ServletException(e.getMessage(), e);
} finally {
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
LOG.error("Error closing report output stream", e);
throw new ServletException(e.getMessage(), e);
}
}
}
/**
* Sets up result properties, parsing etc.
*
* @param invocation Current invocation.
* @throws Exception on initialization error.
*/
private void initializeProperties(ActionInvocation invocation) throws Exception {
if (dataSource == null && connection == null) {
String message = "No dataSource specified...";
LOG.error(message);
throw new RuntimeException(message);
}
if (dataSource != null)
dataSource = conditionalParse(dataSource, invocation);
format = conditionalParse(format, invocation);
if (StringUtils.isEmpty(format)) {
format = FORMAT_PDF;
}
if (contentDisposition != null) {
contentDisposition = conditionalParse(contentDisposition, invocation);
}
if (documentName != null) {
documentName = conditionalParse(documentName, invocation);
}
reportParameters = conditionalParse(reportParameters, invocation);
exportParameters = conditionalParse(exportParameters, invocation);
}
/**
* 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 net.sf.jasperreports.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);
if (delimiter != null) {
exporter.setParameter(JRCsvExporterParameter.FIELD_DELIMITER, delimiter);
}
exporter.exportReport();
output = baos.toByteArray();
return output;
}
}
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