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How to Read Excel File in Java

In this section, we are going to learn how we can read data from an excel file.

In Java, reading excel file is not similar to read word file because of cells in excel file. JDK does not provide direct API to read or write Microsoft Excel or Word document. We have to rely on the third-party library that is Apache POI.

What is Apache POI?

Apache POI (Poor Obfuscation Implementation) is a Java API for reading and writing Microsoft Documents in both formats .xls and .xlsx. It contains classes and interfaces. The Apache POI library provides two implementations for reading excel files:

  • HSSF (Horrible SpreadSheet Format) Implementation: It denotes an API that is working with Excel 2003 or earlier versions.
  • XSSF (XML SpreadSheet Format) Implementation: It denotes an API that is working with Excel 2007 or later versions.

Interfaces and Classes in Apache POI

Interfaces

  • Workbook: It represents an Excel Workbook. It is an interface implement by HSSFWorkbook and XSSFWorkbook.
  • Sheet: It is an interface that represents an Excel worksheet. A sheet is a central structure of a workbook, which represents a grid of cells. The Sheet interface extends java.lang.Iterable.
  • Row: It is also an interface that represents the row of the spreadsheet. The Row interface extends java.lang.Iterable. There are two concrete classes: HSSFRow and XSSFRow.
  • Cell: It is an interface. It is a high-level representation of a cell in a row of the spreadsheet. HSSFCell and XSSFCell implement Cell interface.

Classes

XLS Classes

  • HSSFWorkbook: It is a class representing the XLS file.
  • HSSFSheet: It is a class representing the sheet in an XLS file.
  • HSSFRow: It is a class representing a row in the sheet of XLS file.
  • HSSFCell: It is a class representing a cell in a row of XLS file.

XLSX Classes

  • XSSFWorkbook: It is a class representing the XLSX file.
  • XSSFSheet: It is a class representing the sheet in an XLSX file.
  • XSSFRow: It is a class representing a row in the sheet of XLSX file.
  • XSSFCell: It is a class representing a cell in a row of XLSX file.

Steps to read data from XLS file

Step 1: Create a simple Java project in eclipse.

Step 2: Now, create a lib folder in the project.

Step 3: Download and add the following jar files in the lib folder:

Step 4: Set the Class Path:

Right-click on the project ->Build Path ->Add External JARs -> select all the above jar files -> Apply and close.

Step 5: Now create a class file with the name ReadExcelFileDemo and write the following code in the file.

Step 6: Create an excel file with the name "student.xls" and write some data into it.


How to Read Excel File in Java

Step 7: Save and run the program.

Example of reading excel file (.xls) file

Output:

Name        Age        Height		
Swarit      23.0        5"
Puneet      25.0        6'1"
Swastik     22.0        5'5"
Tejas       12.0        4'9"

Reading XLSX File

All steps will remain same except file format.

Table: employee.xslx


How to Read Excel File in Java

Example of read excel file (.xlsx)

In this example we use XSSFWorkbook class.

Output:

Employee ID   Employee Name    Salary     Designation          Department	
1223.0         Harsh           20000.0    Marketing Manager    Marketing
3213.0         Vivek           15000.0    Financial Advisor    Finance	
6542.0         Krishna         21000.0    HR Manager           HR		
9213.0         Sarika          34000.0    Sales Manager       Sales 

Reading a particular cell value from a excel file (.xlsx)

Table: EmployeeData.xlsx


How to Read Excel File in Java

Example

In the following example, we read the value of the 2nd row and the 2nd column. The row and column counting start from 0. So the program returns "Software Engineer."


How to Read Excel File in Java

Output:

Software Engineer

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