Read / Write Excel file in Java with Apache POIApache POI is a powerful Java library to work with different Microsoft Office file formats such as Excel, Power point, Visio, MS Word etc. The name POI was originally an acronym for Poor Obfuscation Implementation, referring humorously to the fact that the file formats seemed to be deliberately obfuscated, but poorly, since they were successfully reverse- engineered. In this tutorial we will use Apache POI library to perform different functions on Microsoft Excel spreadsheet. Let’s get started. Tools & Technologies: Java JDK 1.

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Apache POI library v. Eclipse 3. 2 above (optional)1. Add Apache POI dependency. Make sure to include apache poi jar file to your project. If your project uses Maven as dependency management, add following in your Pom. Id> org. apache.

Id>. < artifact. Id> poi< /artifact. Id>. < version> 3. If you are not using Maven then you can directly add required JAR files in your classpath.

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Download poi- 2. 5. Include this file in your projects class path. Create new java project in eclipse with auto generated main function.

Read Excel File. To read an excel file, Apache POI provides certain easy- to- use APIs. In below sample code we use different classes from POI library to read content of cell from excel file. This is for quick reference. HSSFWorkbook, HSSFSheet etc. HSSF stands for Horrible Spread.

Initializes a new instance of the String class to the value indicated by a specified pointer to an array of Unicode characters, a starting character position within.

Sheet Format! I’m not kidding. It really is. Similar to HSSF, POI has different prefix for other file formats too: HSSF (Horrible Spread. Sheet Format) – reads and writes Microsoft Excel (XLS) format files. XSSF (XML Spread. Sheet Format) – reads and writes Office Open XML (XLSX) format files. HPSF (Horrible Property Set Format) – reads “Document Summary” information from Microsoft Office files.

HWPF (Horrible Word Processor Format) – aims to read and write Microsoft Word 9. DOC) format files. HSLF (Horrible Slide Layout Format) – a pure Java implementation for Microsoft Power. Point files. HDGF (Horrible Dia.

Gram Format) – an initial pure Java implementation for Microsoft Visio binary files. HPBF (Horrible Pu.

Blisher Format) – a pure Java implementation for Microsoft Publisher files. HSMF (Horrible Stupid Mail Format) – a pure Java implementation for Microsoft Outlook MSG files. DDF (Dreadful Drawing Format) – a package for decoding the Microsoft Office Drawing format. Working with . xlsx files. The classes we used in above code snippet, HSSFWorkbook and HSSFSheet works for . In order to work with newer xls format viz . POI classes like: import org.

HSSFSheet. import org. XSSFSheet. //. It read the sheet from workbook and iterate through each row and cell to print its values.

Just note how we use different methods like get. Boolean. Cell. Value, get. Numeric. Cell. Value etc to read cell value.

Before reading a cell content, we need to first determine its type using method cell. Cell. Type() and then call appropriate method to read content. Download Fileice Survey Bypass 2013 Movies.

Output: Emp IdNameSalary. John2. 00. 00. 00. Dean4. 20. 00. 0. Sam2. 80. 00. 0. Cass6. 00. 00. 00.

Create New Excel File. Let us create a new excel file and write data in it.

Following is the API which we will use for this purpose. HSSFSheet. import org. HSSFWorkbook. //. Update Existing Excel File. Updating an existing excel file is straight forward. Open the excel using different API that we discussed above and set the cell’s value.

One thing we need to note here is that we can update the excel file only when we close it first. Adding Formulas. Apache POI provides API to add excel formulas to cell programmatically. Following method that comes handy for this: cell. Cell. Formula(! Won't work.

The above code will throw: org. Formula. Parse. Exception. The specified formula '=A2*B2*C5' starts with an equals sign which is not allowed. It defines Principal amount, Rate of Interest and Tenure. We add an excel formula to calculate interest. HSSFWorkbook workbook = new HSSFWorkbook(). HSSFSheet sheet = workbook.

Sheet(. Following code snippet will do the trick. File. Input. Stream fis = new File. Input. Stream(. Adding Styles to Cell. Adding style to a cell is also piece of cake. Check following example which creates two new cell one with bold font and another with italic and add text to it.

HSSFWorkbook workbook = new HSSFWorkbook(). HSSFSheet sheet = workbook. Sheet(. Ideally we assume setting background color will have some API like set. Fill. Background. Color, but surprisingly to set background color of a cell, we have to set the foreground color : D.

See below API. cell. Style. set. Fill. Foreground. Color(HSSFColor.

How to: Read Characters from a String. The following code examples show how to read characters synchronously and asynchronously from a string.

It then reads the remaining characters in the string, stores them in the array starting at the sixth element, and displays the contents of the array. It then asynchronously writes each letter or white space character on a separate line followed by a line break to a Text.