Welcome!

Java IoT Authors: Pat Romanski, Elizabeth White, Liz McMillan, Yeshim Deniz, Mehdi Daoudi

Related Topics: Java IoT, Machine Learning

Java IoT: Blog Feed Post

BIRT and Struts 2

BIRT offers several ways reports can be deployed

Java Developer Magazine on Ultizer

BIRT offers several ways reports can be deployed. The AJAX based BIRT viewer can be deployed to your application server, the BIRT tag libraries can be used or you can deploy the Report Engine in your application. You can also modify any of the above options, given that the source is available for download. Several commercial options are also available. This post explains deploying the BIRT engine as an Action component within Struts2. It also discusses using Actuate’s JSAPI with Struts 2’s Bean tag.

BIRT Engine Deployed to Struts 2
The BIRT report engine can be deployed as a Servlet and the process for doing this is described in the BIRT wiki.

If you happen to be using Struts 2 as your application framework you can deploy the Report Engine as an Action component. The process for doing this is not much different than the Servlet approach described in the above link. First you have to implement the ActionSupport class.

package org.birt.struts2;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import org.apache.struts2.util.ServletContextAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import com.opensymphony.xwork2.ActionSupport;
public class BirtStruts2 extends ActionSupport implements ServletContextAware, ServletRequestAware {

private ByteArrayInputStream inputStream;

public ByteArrayInputStream getInputStream() {
return inputStream;
}
private HttpServletRequest request;
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
private ServletContext context;
public void setServletContext(ServletContext context) {
this.context = context;
}
public String execute() throws Exception {

RunBirt rb = new RunBirt();
inputStream = new ByteArrayInputStream(rb.runReport(this.context, this.request));

return SUCCESS;
}

}

In this example we are going to create a RunBirt class that will return the report in a byte array. The above BirtStruts2 class extends the ActionSupport class and implements ServletContextAware and ServletRequestAware. The reason we implement the two extra interfaces is that the RunBirt class will need the ServletContext and the Request object. The BirtStruts2 class also has an inputStream member that is used by the Struts 2 framework to handle the returned report. The struts.config file is as follows:

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="BirtStruts2" extends="struts-default">
<action name="BirtStruts2" class="org.birt.struts2.BirtStruts2">
<result type="stream">
<param name="contentType">text/html</param>
<param name="inputName">inputStream</param>
</result>
</action>
</package>
</struts>


The result for the BirtStruts2 action is set to stream, the content type is set to html, and the inputStream variable from our BirtStruts2 class is set as the inputName stream result parameter. You will need to change the contentType if you plan on altering the example to return PDF, XLS, or Word.

The RunBirt class is similar to the WebReport class described in the Wiki example.

public byte[] runReport(ServletContext sc, HttpServletRequest req) throws ServletException{

this.birtReportEngine = BirtEngine.getBirtEngine(sc);

IReportRunnable design;
try
{
//Open report design
design = birtReportEngine.openReportDesign( sc.getRealPath("/Reports/TopNPercent.rptdesign") );
//create task to run and render report
IRunAndRenderTask task = birtReportEngine.createRunAndRenderTask( design );
task.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, RunBirt.class.getClassLoader());
//task.getAppContext().put("BIRT_VIEWER_HTTPSERVLET_REQUEST", req );
if( req.getParameter("TopCount") != null ){
task.setParameterValue("Top Count", Integer.valueOf(req.getParameter("TopCount")));
}
if( req.getParameter("TopPercentage") != null ){
task.setParameterValue("Top Percentage", Float.valueOf(req.getParameter("TopPercentage")));
}
//set output options
HTMLRenderOption options = new HTMLRenderOption();
options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML);
ByteArrayOutputStream oStream = new ByteArrayOutputStream();
options.setOutputStream(oStream);
options.setImageHandler(new HTMLServerImageHandler());
options.setBaseImageURL(req.getContextPath()+"/images");
options.setImageDirectory(sc.getRealPath("/images"));
task.setRenderOption(options);

//run report
task.run();
task.close();
return oStream.toByteArray();

}catch (Exception e){

e.printStackTrace();
throw new ServletException( e );
}
}
}

If you have used the BIRT Report Engine API there is nothing unique in this example for Struts 2. The report name is hard-coded but could easily be changed to be set as a parameter. The HTML render options are setup to write to a ByteArrayOutputStream which is then converted to a byte array and returned the BirtStruts2 class.

HTMLRenderOption options = new HTMLRenderOption();
options.setOutputFormat(HTMLRenderOption.OUTPUT_FORMAT_HTML);
ByteArrayOutputStream oStream = new ByteArrayOutputStream();
options.setOutputStream(oStream);
options.setImageHandler(new HTMLServerImageHandler());
options.setBaseImageURL(req.getContextPath()+"/images");
options.setImageDirectory(sc.getRealPath("/images"));
task.setRenderOption(options);


The images directory and base URL (pre-pended to the img src tag in the output) are also set based on the passed in ServletContext and Request objects. The only other class is the BirtEngine class which is desribed in the Wiki example but is shown here for completeness. This class provides static synchronized method to return the ReportEngine.

package org.birt.struts2;
import javax.servlet.ServletContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.birt.report.engine.api.EngineConstants;
import org.eclipse.birt.report.engine.api.HTMLRenderOption;
import org.eclipse.birt.report.engine.api.IReportRunnable;
import org.eclipse.birt.report.engine.api.IRunAndRenderTask;
import org.eclipse.birt.report.engine.api.IReportEngine;
import org.eclipse.birt.report.engine.api.HTMLServerImageHandler;
import org.eclipse.birt.report.engine.api.PDFRenderOption;
import org.eclipse.birt.report.engine.api.RenderOption;
import java.io.ByteArrayOutputStream;

public class RunBirt{
private IReportEngine birtReportEngine = null;

package org.birt.struts2;

import java.io.InputStream;
import java.io.IOException;
import java.util.Properties;
import java.util.logging.Level;

import org.eclipse.birt.report.engine.api.EngineConfig;
import org.eclipse.birt.report.engine.api.IReportEngine;
import javax.servlet.*;
import org.eclipse.birt.core.framework.PlatformServletContext;
import org.eclipse.birt.core.framework.IPlatformContext;
import org.eclipse.birt.core.framework.Platform;
import org.eclipse.birt.core.exception.BirtException;
import org.eclipse.birt.report.engine.api.IReportEngineFactory;
import org.eclipse.birt.report.engine.api.ReportEngine;
import javax.servlet.http.HttpServletRequest;

public class BirtEngine {

private static IReportEngine birtEngine = null;

private static Properties configProps = new Properties();

private final static String configFile = "BirtConfig.properties";

public static synchronized void initBirtConfig() {
loadEngineProps();
}

public static synchronized IReportEngine getBirtEngine(ServletContext sc) {
if (birtEngine == null)
{
EngineConfig config = new EngineConfig();
if( configProps != null){
String logLevel = configProps.getProperty("logLevel");
Level level = Level.OFF;
if ("SEVERE".equalsIgnoreCase(logLevel))
{
level = Level.SEVERE;
} else if ("WARNING".equalsIgnoreCase(logLevel))
{
level = Level.WARNING;
} else if ("INFO".equalsIgnoreCase(logLevel))
{
level = Level.INFO;
} else if ("CONFIG".equalsIgnoreCase(logLevel))
{
level = Level.CONFIG;
} else if ("FINE".equalsIgnoreCase(logLevel))
{
level = Level.FINE;
} else if ("FINER".equalsIgnoreCase(logLevel))
{
level = Level.FINER;
} else if ("FINEST".equalsIgnoreCase(logLevel))
{
level = Level.FINEST;
} else if ("OFF".equalsIgnoreCase(logLevel))
{
level = Level.OFF;
}

config.setLogConfig(configProps.getProperty("logDirectory"), level);
}
config.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, BirtEngine.class.getClassLoader());
config.setEngineHome("");

IPlatformContext context = new PlatformServletContext( sc );
config.setPlatformContext( context );

try
{
Platform.startup( config );
}
catch ( BirtException e )
{
e.printStackTrace( );
}

IReportEngineFactory factory = (IReportEngineFactory) Platform
.createFactoryObject( IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY );
birtEngine = factory.createReportEngine( config );


}
return birtEngine;
}

public static synchronized void destroyBirtEngine() {
if (birtEngine == null) {
return;
}
birtEngine.destroy();
Platform.shutdown();
birtEngine = null;
}

To call this code you can implement a page similar to the following:

<html>
<head>
</head>
<body>
<s:form action="/BirtStruts2.action" method="POST">
<s:textfield name="TopCount" label="Top Count"/><br>
<s:textfield name="TopPercentage" label="Top Percentage"/><br>
<s:submit value="Run Report" align="center"/>
</s:form>
</body>
</html>

This example has very little error checking for brevity. Also note that the report engine should be shutdown using a context listener, but should not be shutdown while the context is up and running as starting the engine is resource intensive. Finally no code is provided in the example to remove image files that are generated by the engine in the images directory.

The complete example with ant build and a readme that describes where to put the BIRT plugins and libs is available at Birt-Exchange.

Example Output:

Using Actuate’s JSAPI with Struts 2
If you are using Actuate’s JSAPI, integration with Struts 2 is very easy as the API is AJAX based and can be included in virtually any front-end. One interesting way the two technologies can be deployed together is to use the Struts 2 Bean tag to pass parameters to the JSAPI. For example assume we have the following bean class.

package com.actuate.jsapi.struts2;

public class MyRegionBean {

private String region;
private String rep;

public String getRegion(){
//expecting rep passed in and region lookup in db
//based on the rep. Hard coded for example purposes
this.region = "EMEA";
return region;
}
public void setRegion(String nRegion ){
this.region = nRegion;
}
public String getRep(){
return rep;
}
public void setRep(String nRep ){
this.rep = nRep;
}
}

This bean can be used in conjunction with the JSAPI to pass report parameters to the Report Engine.

<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSAPI Struts 2</title>
</head>
<body>

<div id="acviewer" />
<div id="jsapi_example_container">
<script type="text/javascript"
src="http://localhost:8080/ActuateJavaComponent/jsapi">
</script>

<script type="text/javascript">
actuate.load("viewer");
actuate.initialize("http://localhost:8080/ActuateJavaComponent/",
null,
null,
null,
initViewer);
var viewer;
function initViewer()
{
viewer = new actuate.Viewer("acviewer");
var viewerwidth = 800;
var viewerheight = 620;
viewer.setWidth(viewerwidth);
viewer.setHeight(viewerheight);
runInitial();
}
function runInitial()
{
<s:bean name="com.actuate.jsapi.struts2.MyRegionBean">
<s:param name="rep" value="John Smith" />
viewer.setParameters({"Territory":"<s:property value="region" />"});
</s:bean>
viewer.setReportName("/Public/BIRT and BIRT Report Studio Examples/Sales by Territory.rptdesign");
viewer.submit();

}
</script>
</div>

</body>
</html>


In the runInitial JavaScript function the viewer components setParameters method is called passing the value of the bean’s region member variable as the value for the Territory report parameter.

More information is available on the JSAPI here.

The example is available at Birt-Exchange.

Output for this example is as follows:

Read the original blog entry...

More Stories By Jason Weathersby

Jason Weathersby is a member of the extended BIRT development team at Actuate Corporation and has backgrounds in both computer science and technical writing. He has many years experience in technical consulting, training, writing, and publishing about reporting, business intelligence tools, and database technologies.

IoT & Smart Cities Stories
The platform combines the strengths of Singtel's extensive, intelligent network capabilities with Microsoft's cloud expertise to create a unique solution that sets new standards for IoT applications," said Mr Diomedes Kastanis, Head of IoT at Singtel. "Our solution provides speed, transparency and flexibility, paving the way for a more pervasive use of IoT to accelerate enterprises' digitalisation efforts. AI-powered intelligent connectivity over Microsoft Azure will be the fastest connected pat...
There are many examples of disruption in consumer space – Uber disrupting the cab industry, Airbnb disrupting the hospitality industry and so on; but have you wondered who is disrupting support and operations? AISERA helps make businesses and customers successful by offering consumer-like user experience for support and operations. We have built the world’s first AI-driven IT / HR / Cloud / Customer Support and Operations solution.
Codete accelerates their clients growth through technological expertise and experience. Codite team works with organizations to meet the challenges that digitalization presents. Their clients include digital start-ups as well as established enterprises in the IT industry. To stay competitive in a highly innovative IT industry, strong R&D departments and bold spin-off initiatives is a must. Codete Data Science and Software Architects teams help corporate clients to stay up to date with the mod...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...
Druva is the global leader in Cloud Data Protection and Management, delivering the industry's first data management-as-a-service solution that aggregates data from endpoints, servers and cloud applications and leverages the public cloud to offer a single pane of glass to enable data protection, governance and intelligence-dramatically increasing the availability and visibility of business critical information, while reducing the risk, cost and complexity of managing and protecting it. Druva's...
BMC has unmatched experience in IT management, supporting 92 of the Forbes Global 100, and earning recognition as an ITSM Gartner Magic Quadrant Leader for five years running. Our solutions offer speed, agility, and efficiency to tackle business challenges in the areas of service management, automation, operations, and the mainframe.
The Jevons Paradox suggests that when technological advances increase efficiency of a resource, it results in an overall increase in consumption. Writing on the increased use of coal as a result of technological improvements, 19th-century economist William Stanley Jevons found that these improvements led to the development of new ways to utilize coal. In his session at 19th Cloud Expo, Mark Thiele, Chief Strategy Officer for Apcera, compared the Jevons Paradox to modern-day enterprise IT, examin...
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, @CloudEXPO and DXWorldEXPO are two of the most important technology events of the year. Since its launch over eight years ago, @CloudEXPO and DXWorldEXPO have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, we provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading...
DSR is a supplier of project management, consultancy services and IT solutions that increase effectiveness of a company's operations in the production sector. The company combines in-depth knowledge of international companies with expert knowledge utilising IT tools that support manufacturing and distribution processes. DSR ensures optimization and integration of internal processes which is necessary for companies to grow rapidly. The rapid growth is possible thanks, to specialized services an...
At CloudEXPO Silicon Valley, June 24-26, 2019, Digital Transformation (DX) is a major focus with expanded DevOpsSUMMIT and FinTechEXPO programs within the DXWorldEXPO agenda. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of business. Only 12% still survive. Similar percentages are found throug...