Click here to close now.


Weblogic Authors: Elizabeth White, Michael Meiner, Michael Bushong, Avi Rosenthal

Related Topics: Weblogic

Weblogic: Article

WebLogic Tutorial: "Integrating Apache Poi in WebLogic Server"

The Apache Jakarta POI project provides components for the access and generation of Excel documents

The Apache Jakarta POI project provides components for the access and generation of Excel documents. The POI HSSF API is used to generate Excel Workbooks and to add Excel spreadsheets to a workbook. An Excel spreadsheet consists of rows and cells. The layout and fonts of a spreadsheet are also set with the POI HSSF API.

A database table is often required to be presented in an Excel spreadsheet. Also, a developer's requirement could be to store an Excel spreadsheet in a database table. The Apache POI HSSF project is an API to create an Excel spreadsheet. The data in the Excel spreadsheet generated with the POI HSSF project may be static data in an XML document, or dynamically retrieved data from a database. Also, an Excel document may be converted to an XML document or be stored in a database. In this tutorial we will discuss the procedure to create an Excel spreadsheet from a MySQL database table in WebLogic Server. Subsequently, an Excel spreadsheet will be stored in a database table.

Preliminary Setup
The implementation of the POI HSSF project is provided in the org.apache.poi.hssf.usermodel package. The org.apache.poi.hssf.usermodel package classes are required in the Classpath to generate an Excel spreadsheet or to parse an Excel spreadsheet. Download the Apache POI library file and extract the zip file to an installation directory ( Install WebLogic 8.1 Server. Download the MySQL database ( Extract the MySQL zip file to a directory. Install the MySQL database. Download the MySQL Connector/J JDBC driver ( Extract the MySQL zip file to a directory. Add the MySQL JDBC driver jar file, mysql-connector-java-3.1.10-bin.jar, to the <weblogic81>\samples\domains\examples\startExamplesServer script CLASSPATH variable.

Login to the MySQL database with the DOS command:


Access the example database test with the command:

mysql>use test

Create an example database table in the MySQL database from which an Excel spreadsheet will be generated. The SQL script to create example table Catalog is shown in Listing 1.

Next, we will add the Apache POI .jar file to the WebLogic Server Classpath and create a JDBC datasource in the WebLogic Server to retrieve data for an Excel spreadsheet.

Add the poi-2.5.1-final-20040804.jar file to the CLASSPATH variable in the <weblogic81>\samples\domains\examples\startExamplesServer script. <weblogic81> is the directory in which the WebLogic Server is installed.

Next, create a JDBC connection with the MySQL database in WebLogic Server. Start the examples server with the script startExamplesServer. Access the administration console with the URL http://localhost:7001/console or with the Administration Console link in the WebLogic Server Examples index. In the administration console, right-click on the examples>Services>JDBC>Connection Pools node and select Configure a new JDBCConnectionPool. Specify the following connection properties to configure a JDBC connection pool:

  • The database type: MySQL
  • The JDBC driver: MySQL's Driver (Type 4)
  • Database name: test
  • Host name: localhost
  • Port number: 3306
  • Driver class name: com.mysql.jdbc.Driver
  • Connection URL: jdbc:mysql://localhost:3306/test
Next, configure a JDBC datasource in the administration console. Right-click on the examples>Services>JDBC>DataSources node and select Configure a new JDBCTxDataSource. In the "Configure the data source" frame, specify a datasource name and a JNDI Name - MySqlDS, for example. In the "Connect to connection pool" frame select the Connection Pool previously configured with the MySQL database. In the "Target the datasource frame," select the examplesServer. A datasource gets configured with the MySQL database.

Generating an Excel Document with Apache POI
In this section we will generate an Excel spreadsheet from the example database table. First, create a JSP application to generate an Excel spreadsheet.

In the JSP an Excel spreadsheet will be created from a MySQL database table. The Apache POI HSSF API is used to generate an Excel spreadsheet. The Apache POI HSSF package has classes for the different components of an Excel spreadsheet. Some of the commonly used classes of the Apache POI HSSF package are listed in Table 1.

First, import the Apache POI HSSF package:

<%@ page import="org.apache.poi.hssf.usermodel.*, java.sql.*,*,javax.naming.InitialContext"%>

Create an Excel stylesheet workbook:

HSSFWorkbook wb=new HSSFWorkbook();

Next, create an Excel spreadsheet:

HSSFSheet sheet1=wb.createSheet("sheet1");

The data for the stylesheet is retrieved from a MySQL database table. Obtain a JDBC connection from the database. The JDBC connection is obtained with the datasource JNDI MySqlDS.

InitialContext initialContext = new InitialContext();
javax.sql.DataSource ds = (javax.sql.DataSource)
java.sql.Connection conn = ds.getConnection();

Create a java.sql.Statement and get a result set from the example table Catalog:

Statement stmt=conn.createStatement();
ResultSet resultSet=stmt.executeQuery("Select * from Catalog");

Create a header row for the Excel spreadsheet. The rows in an Excel spreadsheet are "0" based.

HSSFRow row=sheet1.createRow(0);

Set the header row cell values corresponding to the table columns. The row cells are also "0" based. For example, the value for the first cell in the row is set with the setCellValue method to CatalogId.


To add rows to the spreadsheet, iterate over the result set and add a row for each of the table rows. Retrieve the column values from the ResultSet and set the values in the row cells.

More Stories By Deepak Vohra

Deepak Vohra is a Sun Certified Java 1.4 Programmer and a Web developer.

More Stories By Ajay Vohra

Ajay Vohra is a senior solutions architect with DataSynapse Inc.

Comments (2) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

Most Recent Comments
bob kennelly 08/19/06 05:49:54 PM EDT

Hello this is just what i've been looking for, it's a very helpfull article!

In the article there is a statement saying "see the Reference area" to find the JSP code, can anyone tell me where i can find the reference section please?

Thanks very much!

SYS-CON Italy News Desk 02/19/06 03:33:36 PM EST

The Apache Jakarta POI project provides components for the access and generation of Excel documents. The POI HSSF API is used to generate Excel Workbooks and to add Excel spreadsheets to a workbook. An Excel spreadsheet consists of rows and cells. The layout and fonts of a spreadsheet are also set with the POI HSSF API.

@ThingsExpo Stories
Cloud computing delivers on-demand resources that provide businesses with flexibility and cost-savings. The challenge in moving workloads to the cloud has been the cost and complexity of ensuring the initial and ongoing security and regulatory (PCI, HIPAA, FFIEC) compliance across private and public clouds. Manual security compliance is slow, prone to human error, and represents over 50% of the cost of managing cloud applications. Determining how to automate cloud security compliance is critical to maintaining positive ROI. Raxak Protect is an automated security compliance SaaS platform and ma...
The Internet of Things (IoT) is growing rapidly by extending current technologies, products and networks. By 2020, Cisco estimates there will be 50 billion connected devices. Gartner has forecast revenues of over $300 billion, just to IoT suppliers. Now is the time to figure out how you’ll make money – not just create innovative products. With hundreds of new products and companies jumping into the IoT fray every month, there’s no shortage of innovation. Despite this, McKinsey/VisionMobile data shows "less than 10 percent of IoT developers are making enough to support a reasonably sized team....
Just over a week ago I received a long and loud sustained applause for a presentation I delivered at this year’s Cloud Expo in Santa Clara. I was extremely pleased with the turnout and had some very good conversations with many of the attendees. Over the next few days I had many more meaningful conversations and was not only happy with the results but also learned a few new things. Here is everything I learned in those three days distilled into three short points.
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York and Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound cha...
DevOps is about increasing efficiency, but nothing is more inefficient than building the same application twice. However, this is a routine occurrence with enterprise applications that need both a rich desktop web interface and strong mobile support. With recent technological advances from Isomorphic Software and others, rich desktop and tuned mobile experiences can now be created with a single codebase – without compromising functionality, performance or usability. In his session at DevOps Summit, Charles Kendrick, CTO and Chief Architect at Isomorphic Software, demonstrated examples of com...
As organizations realize the scope of the Internet of Things, gaining key insights from Big Data, through the use of advanced analytics, becomes crucial. However, IoT also creates the need for petabyte scale storage of data from millions of devices. A new type of Storage is required which seamlessly integrates robust data analytics with massive scale. These storage systems will act as “smart systems” provide in-place analytics that speed discovery and enable businesses to quickly derive meaningful and actionable insights. In his session at @ThingsExpo, Paul Turner, Chief Marketing Officer at...
In his keynote at @ThingsExpo, Chris Matthieu, Director of IoT Engineering at Citrix and co-founder and CTO of Octoblu, focused on building an IoT platform and company. He provided a behind-the-scenes look at Octoblu’s platform, business, and pivots along the way (including the Citrix acquisition of Octoblu).
In his General Session at 17th Cloud Expo, Bruce Swann, Senior Product Marketing Manager for Adobe Campaign, explored the key ingredients of cross-channel marketing in a digital world. Learn how the Adobe Marketing Cloud can help marketers embrace opportunities for personalized, relevant and real-time customer engagement across offline (direct mail, point of sale, call center) and digital (email, website, SMS, mobile apps, social networks, connected objects).
We all know that data growth is exploding and storage budgets are shrinking. Instead of showing you charts on about how much data there is, in his General Session at 17th Cloud Expo, Scott Cleland, Senior Director of Product Marketing at HGST, showed how to capture all of your data in one place. After you have your data under control, you can then analyze it in one place, saving time and resources.
The Internet of Everything is re-shaping technology trends–moving away from “request/response” architecture to an “always-on” Streaming Web where data is in constant motion and secure, reliable communication is an absolute necessity. As more and more THINGS go online, the challenges that developers will need to address will only increase exponentially. In his session at @ThingsExpo, Todd Greene, Founder & CEO of PubNub, exploreed the current state of IoT connectivity and review key trends and technology requirements that will drive the Internet of Things from hype to reality.
Two weeks ago (November 3-5), I attended the Cloud Expo Silicon Valley as a speaker, where I presented on the security and privacy due diligence requirements for cloud solutions. Cloud security is a topical issue for every CIO, CISO, and technology buyer. Decision-makers are always looking for insights on how to mitigate the security risks of implementing and using cloud solutions. Based on the presentation topics covered at the conference, as well as the general discussions heard between sessions, I wanted to share some of my observations on emerging trends. As cyber security serves as a fou...
With all the incredible momentum behind the Internet of Things (IoT) industry, it is easy to forget that not a single CEO wakes up and wonders if “my IoT is broken.” What they wonder is if they are making the right decisions to do all they can to increase revenue, decrease costs, and improve customer experience – effectively the same challenges they have always had in growing their business. The exciting thing about the IoT industry is now these decisions can be better, faster, and smarter. Now all corporate assets – people, objects, and spaces – can share information about themselves and thei...
Continuous processes around the development and deployment of applications are both impacted by -- and a benefit to -- the Internet of Things trend. To help better understand the relationship between DevOps and a plethora of new end-devices and data please welcome Gary Gruver, consultant, author and a former IT executive who has led many large-scale IT transformation projects, and John Jeremiah, Technology Evangelist at Hewlett Packard Enterprise (HPE), on Twitter at @j_jeremiah. The discussion is moderated by me, Dana Gardner, Principal Analyst at Interarbor Solutions.
Too often with compelling new technologies market participants become overly enamored with that attractiveness of the technology and neglect underlying business drivers. This tendency, what some call the “newest shiny object syndrome” is understandable given that virtually all of us are heavily engaged in technology. But it is also mistaken. Without concrete business cases driving its deployment, IoT, like many other technologies before it, will fade into obscurity.
Discussions of cloud computing have evolved in recent years from a focus on specific types of cloud, to a world of hybrid cloud, and to a world dominated by the APIs that make today's multi-cloud environments and hybrid clouds possible. In this Power Panel at 17th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists addressed the importance of customers being able to use the specific technologies they need, through environments and ecosystems that expose their APIs to make true change and transformation possible.
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists discussed what things are the most important, which will have the most profound effect on the world, and what should we expect to see over the next couple of years.
Microservices are a very exciting architectural approach that many organizations are looking to as a way to accelerate innovation. Microservices promise to allow teams to move away from monolithic "ball of mud" systems, but the reality is that, in the vast majority of organizations, different projects and technologies will continue to be developed at different speeds. How to handle the dependencies between these disparate systems with different iteration cycles? Consider the "canoncial problem" in this scenario: microservice A (releases daily) depends on a couple of additions to backend B (re...
The cloud. Like a comic book superhero, there seems to be no problem it can’t fix or cost it can’t slash. Yet making the transition is not always easy and production environments are still largely on premise. Taking some practical and sensible steps to reduce risk can also help provide a basis for a successful cloud transition. A plethora of surveys from the likes of IDG and Gartner show that more than 70 percent of enterprises have deployed at least one or more cloud application or workload. Yet a closer inspection at the data reveals less than half of these cloud projects involve production...
Growth hacking is common for startups to make unheard-of progress in building their business. Career Hacks can help Geek Girls and those who support them (yes, that's you too, Dad!) to excel in this typically male-dominated world. Get ready to learn the facts: Is there a bias against women in the tech / developer communities? Why are women 50% of the workforce, but hold only 24% of the STEM or IT positions? Some beginnings of what to do about it! In her Day 2 Keynote at 17th Cloud Expo, Sandy Carter, IBM General Manager Cloud Ecosystem and Developers, and a Social Business Evangelist, wil...
PubNub has announced the release of BLOCKS, a set of customizable microservices that give developers a simple way to add code and deploy features for realtime apps.PubNub BLOCKS executes business logic directly on the data streaming through PubNub’s network without splitting it off to an intermediary server controlled by the customer. This revolutionary approach streamlines app development, reduces endpoint-to-endpoint latency, and allows apps to better leverage the enormous scalability of PubNub’s Data Stream Network.