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How to generate excel sheet by using java

To generate an excel sheet by using java, we need to download the jxl.jar. This will help us to generate xls file by using predefined classes. For downloading jxl jar click here. This link will point to Maven repository from there you need to click on download button for downloading jar file.

When jxl jar downloading will get complete, add the jar to project class path by following these steps. Right click on project --> goto properties --> select java build path --> select libraries --> click on add external jars button to browse downloaded jar path --> select jar and click on open button --> Ok. This jar file will provide few classes to design the excel sheet. 

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package com.thbs.java.jxl;

import java.io.File;

//Import the JExcel API
import jxl.Workbook;
import jxl.format.Colour;
import jxl.write.Label;
import jxl.write.WritableCell;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

/*
* Created By JavaTBrains
*
* This Java class is used to create an Excel File output
* from a given String
*
*/

public class CreateExcelSheet {

   public static void main(String[] args) {
     try {

     /*
     * The assumption is that the data has the field separator as comma
     * (,) and the end separator for each record is found by the literal
     * END
     */

     // Assume the below is the input file format
     String input = "100,subba reddy,MIS,Software Engineer END 200,Nallamachu S,Java,Programmer END 300,Reddy   Nallamachu,MISTechmologies,Project Manager END";

     int counter = 0;

     WritableWorkbook workbook = Workbook.createWorkbook(new File(
"E:/LOGS/excel.xls"));
     WritableSheet sheet = workbook.createSheet("Page1", 0);

     // Set Header

     String header[] = new String[4];
     header[0] = "Emp ID";
     header[1] = "Name";
     header[2] = "Department";
     header[3] = "Designation";

     // Setting Background colour for Cells
     Colour bckcolor = Colour.LIME;
     WritableCellFormat cellFormat = new WritableCellFormat();
     cellFormat.setBackground(bckcolor);

     // Setting Colour & Font for the Text

     WritableFont font = new WritableFont(WritableFont.ARIAL);
     font.setColour(Colour.BLACK);
     cellFormat.setFont(font);

     // Write the Header to the excel file
     for (int i = 0; i < header.length; i++) {
         Label label = new Label(i, 0, header[i]);
         sheet.addCell(label);
         WritableCell cell = sheet.getWritableCell(i, 0);
         cell.setCellFormat(cellFormat);
     }

     String inputArray[] = input.split("END");

     for (int i = 0; i < inputArray.length; i++) {

         counter++;

         String fieldValuesArray[] = inputArray[i].split(",");

         for (int j = 0; j < fieldValuesArray.length; j++) {

             Label label = new Label(j, counter,
             fieldValuesArray[j].toString());
             sheet.addCell(label);
         }
     }

      workbook.write();
      workbook.close();

     } catch (Exception e) {
     /*
     * Write your logic to handle exception. For a module,
     * recommendation is to write out trace/log messages so that  error
     * tracking is easy via the adapter logs
     */
     }
   }
}

When we will execute above source code in our local, it will generates an excel sheet with few values which we added in a String class. String value will separate the line where all the END word is present. Then each line will divide by (,) to peace of words, that will treat as the column values.

Now, lets come into the excel design.
  • In this article we are using the Workbook class which will write xls file.
  • WritableWorkbook is one more class which will creates .xls file. 
  • WorkSheet class will represents the sheets inside the .xls file. 
  • Color, WritableFont and WritableCellFormat classes will help us to design cells/Font into custom format.
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Location: Bengaluru, Karnataka 560017, India

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