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In this tutorial we will use Apache POI library to perform different functions on Microsoft Excel spreadsheet. To read an excel file, Apache POI provides certain easy-to-use APIs. However, to get the most out of it, you need to have some prerequisites installed: Rails is a web application framework running on the Ruby programming language.If you have no prior experience with Ruby, you will find a very steep learning curve diving straight into Rails. HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.create Sheet("Calculate Simple Interest"); Row header = sheet.create Row(0); header.create Cell(0)Cell Value("Pricipal Amount (P)"); header.create Cell(1)Cell Value("Rate of Interest (r)"); header.create Cell(2)Cell Value("Tenure (t)"); header.create Cell(3)Cell Value("Interest (P r t)"); Row data Row = sheet.create Row(1); data Row.create Cell(0)Cell Value(14500d); data Row.create Cell(1)Cell Value(9.25); data Row.create Cell(2)Cell Value(3d); data Row.create Cell(3)Cell Formula("A2*B2*C2"); try catch (File Not Found Exception e) catch (IOException e) File Input Stream fis = new File Input Stream("/somepath/test.xls"); Workbook wb = new HSSFWorkbook(fis); //or new XSSFWorkbook("C:\test.xls") Formula Evaluator evaluator = Creation Helper().create Formula Evaluator(); for(int sheet Num = 0; sheet Num class to evaluate formula defined in each of the cell. Check following example which creates two new cell one with bold font and another with italic and add text to it. Similar to HSSF, POI has different prefix for other file formats too: import org.hssf.usermodel. One thing we need to note here is that we can update the excel file only when we close it first.Windows users can use Rails Installer, while mac OS users can use Tokaido.
On Windows, if you installed Rails through Rails Installer, you already have SQLite installed.All steps are essential to run this example application and no additional code or steps are needed.By following along with this guide, you'll create a Rails project called A number of tools exist to help you quickly install Ruby and Ruby on Rails on your system.Currently, Azat works as a Team Lead / Senior Software Engineer at Docu Sign, where his team rebuilds 50 million user product (Docu Sign web app) using the tech stack of Node.js, Express.js, Backbone.js, Coffee Script, Jade, Stylus and Redis.
Recently, he worked as an engineer at the curated social media news aggregator website, (acquired by Live Fyre) which is used by BBC, NBC, CNN, The White House and others. It’s the maintainer of the open-source library jade-browser.
If you persist in bringing old habits from other languages to your Rails development, and trying to use patterns you learned elsewhere, you may have a less happy experience.