Best answer: How do I read an existing Excel file in Java?

Can Java read Excel files?

Although it is not an opened file format, Java applications can still read and write Excel files using the Apache POI – the Java API for Microsoft Documents, because the development team uses reverse-engineering to understand the Excel file format. Hence the name POI stands for Poor Obfuscation Implementation.

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 can I download Excel file in Java?

First of all download the JAR file of JAVA POI library. The POI library is to read the Sheet and then after you can write the data in that sheet using this library. Step-1 : Download the JAR of POI library. Step-2 : Read the Sheet using POI library.

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What are the jars required to read Excel file in Java?

Excel file can be read by Java IO operation. For that, we need to use Apache POI Jar. There are two kinds of a workbook in Excel file, XLSX and XLS files. POI has different Interfaces Workbook, Sheet, Row, Cell.

How do I view an XLSX file?

How to open an XLSX file

  1. Step 1: Double click on the XLSX file. To open XLSX files in Excel, simply double click on the file. …
  2. Step 2: Drag and drop the XLSX file onto an Excel window to open it. …
  3. Step 3: “Open with” – open the XLSX file in Excel using the right-click menu.

How do you read data from an Excel file?

File: Workbook

  1. Select Data > Get Data > From File > From Workbook.
  2. In the Excel Browse dialog box, browse for or type a path to the file that you want to query.
  3. Select Open.

How do you write values 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 you write into Excel using Hashmap?

write excel file using poi:

  1. Create a blank workbook.
  2. Create a sheet and pass name of the sheet.
  3. Create row.
  4. Create cells, set its value and add cell to above row.
  5. Repeat 3 and 4 until you have data.
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How is Apache POI implemented?

Get the Sheet instance using getSheetAt(int i) method. Get Row iterator and then Cell iterator to get the Cell object. Apache POI is using iterator pattern here. Use switch-case to read the type of Cell and the process it accordingly.

How add Excel to eclipse?

to import one or multiple files, select the folder/project where i want to add the files, then use the menu file > import :

  1. menu file import.
  2. import context menu.
  3. import from file system.
  4. importing files from filesystem.
  5. drag and drop to add files.

What is the difference between an XLS and XLSX file?

The File Format Difference

XLS files are based on the Binary Interchange File Format (BIFF) and store information in binary format as per XLS File Format Specifications. … In contrast, an XLSX file is based on Office Open XML format that stores data in compressed XML files in ZIP format.

How do I write an XLSX file in Java?

How to Write Data into Excel Sheet using Java?

  1. Create a blank workbook. XSSFWorkbook workbook = new XSSFWorkbook();
  2. Create a sheet and name it. XSSFSheet spreadsheet = workbook.createSheet(” Student Data “);
  3. Create a row. Row row = sheet. …
  4. Add cells to the sheet.
  5. Repeat Steps 3 and 4 to write the complete data.

What is Sxssfworkbook?

Sxssfworkbook is a streaming version of xssfworkbook. It only saves the latest excel rows for viewing in memory. Before that, excel rows will be written to the hard disk (for windows computers, it is written to the temp folder under the root directory of C disk).

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How do I get row count and column count in Excel?

In this blog we will use Apache POI to get the row count and column count from the excel sheet.

Below are the classes will use to read/write the data:

  1. FileInputStream – A FileInputStream is an inputstream for reading data from a File.
  2. XSSFWorkbook.
  3. XSSFSheet.
  4. XSSFRow.
  5. XSSFCell.