How to read excel file data in java and convert it into an array

To read data from Excel file and convert to array, you can use Apache POI library, follow these steps: Add Apache POI library dependency. Create File and FileInputStream objects. Create a Workbook object. Get the worksheet at the specified index. Iterate over rows and columns. Get the cell value and convert it to String. Store data in a two-dimensional array.

Read Excel file data in Java and convert it into an array

Concise summary:

To read data from an Excel file and convert it into an array, you can use the Apache POI library. This library provides an API to easily manipulate and parse Excel files.

Detailed instructions:

1. Add the Apache POI library:

Add the dependencies of the Apache POI library to the project :

<code class="xml"><dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>5.2.2</version>
</dependency></code>

2. Create File and FileInputStream:

To read Excel files, first create a File object and a FileInputStream Object:

<code class="java">File excelFile = new File("path/to/your.xlsx");
FileInputStream inputStream = new FileInputStream(excelFile);</code>

3. Create Workbook:

Use the POI WorkbookFactory class to create a Workbook object, This object represents an Excel file:

<code class="java">Workbook workbook = WorkbookFactory.create(inputStream);</code>

4. Processing Sheet:

Each Excel file may contain multiple worksheets, you can use workbook.getSheetAt( index) Get the Sheet at a specific index:

<code class="java">Sheet sheet = workbook.getSheetAt(0);</code>

5. Traverse rows and columns:

Use sheet.getPhysicalNumberOfRows() and sheet.getRow(rowIndex).getPhysicalNumberOfCells() Traverse rows and columns:

<code class="java">for (int i = 0; i < sheet.getPhysicalNumberOfRows(); i++) {
  Row row = sheet.getRow(i);
  for (int j = 0; j < row.getPhysicalNumberOfCells(); j++) {
    Cell cell = row.getCell(j);
  }
}</code>

6. Get cell value:

Use cell.toString() Get the value of the cell and convert it to String:

<code class="java">String value = cell.toString();</code>

7. Convert to array:

will read Data is stored in an array. You can create a two-dimensional array String[][] to save the data:

<code class="java">String[][] data = new String[sheet.getPhysicalNumberOfRows()][sheet.getRow(0).getPhysicalNumberOfCells()];
for (int i = 0; i < sheet.getPhysicalNumberOfRows(); i++) {
  Row row = sheet.getRow(i);
  for (int j = 0; j < row.getPhysicalNumberOfCells(); j++) {
    data[i][j] = cell.toString();
  }
}</code>

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