Frequent question: How do I add a column in Excel in Java?

How do I create a column in Excel in Java?

To create a cell in Excel Sheet, we can use Apache POI which provides createCell() method. This method requires an integer argument which should be a column number. The createCell() is a method of Row class.

How do you add data in existing Excel using Java?

Java Example to Update Existing Excel Files Using Apache POI

  1. Read the Excel file to an InputStreamand get the Workbook from this stream.
  2. Update new data to an existing Sheet or create a new Sheet.
  3. Close the InputStream.
  4. Write the workbook to an OutputStream. This will overwrite the existing file with updated data.

How do I add a header in Excel in Java?

Apache POI Excel Header Example

  1. package poiexample;
  2. import java.io.FileOutputStream;
  3. import java.io.OutputStream;
  4. import org.apache.poi.hssf.usermodel.HSSFWorkbook;
  5. import org.apache.poi.ss.usermodel.Cell;
  6. import org.apache.poi.ss.usermodel.Header;
  7. import org.apache.poi.ss.usermodel.Row;
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How do you update a cell in Excel in Java?

Steps to update excel file will be:

  1. Open excel file in input mode (inputstream)
  2. Use POI API and read the excel content.
  3. Update cell’s value using different setCellValue methods.
  4. Close the excel input file (inputstream)
  5. Open same excel file in output mode (outputstream)
  6. Write content of updated workbook in output file.

How do I create multiple sheets in Excel using Java?

Creating Sheets in Excel File in Java using Apache POI

  1. Create a JAVA Maven project.
  2. Create a class in javaResource folder. import java.io.*; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; public class CreateSheet {

How do you create a row in Java?

The insertRow() method of the ResultSet interface inserts the contents of the row into the ResultSet object (and into the table as well). Statement stmt = con. createStatement( ResultSet.

How do I open an existing Excel file in Java?

Steps to Open Existing Excel Sheet in Java, in eclipse

  1. Create a JAVA Maven project.
  2. Create a class in javaResource folder. import java.io.File; import java.io.FileInputStream; import org.apache.poi.xssf.usermodel.XSSFWorkbook; public class GFG { …
  3. Run the code as java aplication.
  4. Finish.

How do you add a column in Apache POI in Excel?

2 Answers. There is no explicit way of doing this using apache POI. If you know the number of rows and the number of columns that you need, you can first create the required number of rows and then create the corresponding cells in the rows.

What is difference between XSSF and HSSF?

HSSF is the POI Project’s pure Java implementation of the Excel ’97(-2007) file format. XSSF is the POI Project’s pure Java implementation of the Excel 2007 OOXML (. xlsx) file format. HSSF and XSSF provides ways to read spreadsheets create, modify, read and write XLS spreadsheets.

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How do I add a footer in Excel in Java?

How to set header and footer in Java

  1. Step 1: Download and install EasyXLS Excel Library for Java. …
  2. Step 2: Create a Java project. …
  3. Step 3: Include EasyXLS library into project. …
  4. Step 4: Run Java code that exports an Excel file with header and footer.

How do I bold a cell in Excel in Java?

There exists a method “setCellStyle” in the class Cell, that takes an object of type HSSFCellStyle , which we can use for formatting. You can do anything with HSSFCellStyle, and we are going to see how to make cell bold with HSSFCellStyle. Let us get started. Create a workbook and worksheet to start with.

What is XSSFWorkbook in Java?

XSSFWorkbook. It is a class that is used to represent both high and low level Excel file formats. It belongs to the org. apache. xssf.

How do you copy one Excel file to another Excel file using Java?

Duplicate Worksheets within a Workbook

Load an Excel file using LoadFromFile() method. Get the specific worksheet from workbook using get() method. Add a new blank sheet to the workbook using add() method. Copy the original worksheet to the new sheet using copyFrom() method.

How do you read and write in the same Excel file in Java?

1 Answer

  1. Open the file to Input stream.
  2. Open the same file to an Output Stream.
  3. Read and do the processing.
  4. Write contents to output stream.
  5. Close the read/input stream, close file.
  6. Close output stream, close file.

How do I create a table in Excel using Apache POI?

Insert Table – Format As Table – Excel Apache POI Example

  1. Create a workbook object, Add a worksheet.
  2. Create an XSSFTable object in the worksheet.
  3. Get CTTable object from XSSFTable.
  4. Define Style and Style options for your Excel Table – CTTableStyleInfo.
  5. Define Data Range for your Excel Table – AreaReference.
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