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Apache POI Tutorial 
41 
$javac Readsheet.java 
$java Readsheet 
If your system environment is configured with the POI library, it will compile and 
execute to generate the following output in the command prompt.  
EMP ID  
EMP NAME   
DESIGNATION  
tp01   
Gopal  
Technical Manager    
tp02   
Manisha    
Proof Reader    
tp03   
Masthan         Technical Writer  
tp04   
Satish  
Technical Writer  
tp05   
Krishna    
Technical Writer 
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Apache POI Tutorial 
42 
Any data that you enter into a spreadsheet is always stored in a cell. We use the 
labels  of  rows  and  columns  to  identify  a  cell.  This  chapter  describes  how  to 
manipulate data in cells in a spreadsheet using Java programming. 
Create a Cell 
You need to create a row before creating a cell. A row is nothing but a collection of 
cells.  
The following code snippet is used for creating a cell. 
//create new workbook 
XSSFWorkbook workbook = new XSSFWorkbook();  
//create spreadsheet with a name 
XSSFSheet spreadsheet = workbook.createSheet("new sheet"); 
//create first row on a created spreadsheet 
XSSFRow row = spreadsheet.createRow(0); 
//create first cell on created row 
XSSFCell cell = row.createCell(0); 
Types of Cells 
The  cell  type  specifies  whether  a  cell  can  contain  strings,  numeric  value,  or 
formulas. A string cell cannot hold numeric values and a numeric cell cannot hold 
strings. Given below are the types of cells, their values, and type syntax.  
Cells 
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Apache POI Tutorial 
43 
Type of cell value 
Type Syntax 
Blank cell value 
XSSFCell.CELL_TYPE_BLANK 
Boolean cell value 
XSSFCell.CELL.TYPE_BOOLEAN 
Error cell value 
XSSFCell.CELL_TYPE_ERROR 
Numeric cell value 
XSSFCell.CELL_TYPE_NUMERIC 
String cell value 
XSSFCell.CELL_TYPE_STRING 
The following code is used to create different types of cells in a spreadsheet. 
import java.io.File; 
import java.io.FileOutputStream; 
import java.util.Date; 
import org.apache.poi.xssf.usermodel.XSSFCell; 
import org.apache.poi.xssf.usermodel.XSSFRow; 
import org.apache.poi.xssf.usermodel.XSSFSheet; 
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 
public class TypesofCells  
public static void main(String[] args)throws Exception  
n  
XSSFWorkbook workbook = new XSSFWorkbook();  
XSSFSheet spreadsheet = workbook.createSheet("cell types"); 
XSSFRow row = spreadsheet.createRow((short) 2); 
row.createCell(0).setCellValue("Type of Cell"); 
row.createCell(1).setCellValue("cell value"); 
row = spreadsheet.createRow((short) 3); 
row.createCell(0).setCellValue("set cell type BLANK"); 
row.createCell(1); 
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Apache POI Tutorial 
44 
row = spreadsheet.createRow((short) 4); 
row.createCell(0).setCellValue("set cell type BOOLEAN"); 
row.createCell(1).setCellValue(true); 
row = spreadsheet.createRow((short) 5); 
row.createCell(0).setCellValue("set cell type ERROR"); 
row.createCell(1).setCellValue(XSSFCell.CELL_TYPE_ERROR ); 
row = spreadsheet.createRow((short) 6); 
row.createCell(0).setCellValue("set cell type date"); 
row.createCell(1).setCellValue(new Date()); 
row = spreadsheet.createRow((short) 7); 
row.createCell(0).setCellValue("set cell type numeric" ); 
row.createCell(1).setCellValue(20 ); 
row = spreadsheet.createRow((short) 8); 
row.createCell(0).setCellValue("set cell type string"); 
row.createCell(1).setCellValue("A String"); 
FileOutputStream out = new FileOutputStream( 
new File("typesofcells.xlsx")); 
workbook.write(out); 
out.close(); 
System.out.println( 
"typesofcells.xlsx written successfully"); 
Save the above code in a file named TypesofCells.java, compile and execute it 
from the command prompt as follows. 
$javac TypesofCells.java 
$java TypesofCells 
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Apache POI Tutorial 
45 
If your system is configured with the POI library, then it will compile and execute to 
generate  an  Excel  file  named  typesofcells.xlsx  in  your  current  directory  and 
display the following output.  
typesofcells.xlsx written successfully 
The typesofcells.xlsx file looks as follows. 
Cell Styles 
Here you  can  learn how to do  cell formatting and  apply different styles  such as 
merging adjacent cells, adding borders, setting cell alignment and filling with colors. 
The following code is used to apply different styles to cells using Java programming. 
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Apache POI Tutorial 
46 
import java.io.File; 
import java.io.FileOutputStream; 
import org.apache.poi.hssf.util.HSSFColor; 
import org.apache.poi.ss.usermodel.IndexedColors; 
import org.apache.poi.ss.util.CellRangeAddress; 
import org.apache.poi.xssf.usermodel.XSSFCell; 
import org.apache.poi.xssf.usermodel.XSSFCellStyle; 
import org.apache.poi.xssf.usermodel.XSSFRow; 
import org.apache.poi.xssf.usermodel.XSSFSheet; 
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 
public class CellStyle  
public static void main(String[] args)throws Exception  
n  
XSSFWorkbook workbook = new XSSFWorkbook();  
XSSFSheet spreadsheet = workbook.createSheet("cellstyle"); 
XSSFRow row = spreadsheet.createRow((short) 1); 
row.setHeight((short) 800); 
XSSFCell cell = (XSSFCell) row.createCell((short) 1); 
cell.setCellValue("test of merging"); 
//MEARGING CELLS  
//this statement for merging cells 
spreadsheet.addMergedRegion(new CellRangeAddress( 
1, //first row (0-based) 
1, //last row  (0-based) 
1, //first column (0-based) 
 //last column  (0-based) 
)); 
//CELL Alignment 
Apache POI Tutorial 
47 
row = spreadsheet.createRow(5);                 
cell = (XSSFCell) row.createCell(0); 
row.setHeight((short) 800); 
// Top Left alignment  
XSSFCellStyle style1 = workbook.createCellStyle(); 
spreadsheet.setColumnWidth(0, 8000); 
style1.setAlignment(XSSFCellStyle.ALIGN_LEFT); 
style1.setVerticalAlignment(XSSFCellStyle.VERTICAL_TOP); 
cell.setCellValue("Top Left"); 
cell.setCellStyle(style1); 
row = spreadsheet.createRow(6);             
cell = (XSSFCell) row.createCell(1); 
row.setHeight((short) 800); 
// Center Align Cell Contents  
XSSFCellStyle style2 = workbook.createCellStyle(); 
style2.setAlignment(XSSFCellStyle.ALIGN_CENTER); 
style2.setVerticalAlignment(                   
XSSFCellStyle.VERTICAL_CENTER); 
cell.setCellValue("Center Aligned");             
cell.setCellStyle(style2); 
row = spreadsheet.createRow(7);             
cell = (XSSFCell) row.createCell(2); 
row.setHeight((short) 800); 
// Bottom Right alignment  
XSSFCellStyle style3 = workbook.createCellStyle(); 
style3.setAlignment(XSSFCellStyle.ALIGN_RIGHT); 
style3.setVerticalAlignment(  
Apache POI Tutorial 
48 
XSSFCellStyle.VERTICAL_BOTTOM); 
cell.setCellValue("Bottom Right");               
cell.setCellStyle(style3); 
row = spreadsheet.createRow(8); 
cell = (XSSFCell) row.createCell(3); 
// Justified Alignment  
XSSFCellStyle style4 = workbook.createCellStyle(); 
style4.setAlignment(XSSFCellStyle.ALIGN_JUSTIFY); 
style4.setVerticalAlignment( 
XSSFCellStyle.VERTICAL_JUSTIFY); 
cell.setCellValue("Contents are Justified in Alignment");                
cell.setCellStyle(style4); 
//CELL BORDER 
row = spreadsheet.createRow((short) 10); 
row.setHeight((short) 800); 
cell = (XSSFCell) row.createCell((short) 1); 
cell.setCellValue("BORDER"); 
XSSFCellStyle style5 = workbook.createCellStyle(); 
style5.setBorderBottom(XSSFCellStyle.BORDER_THICK); 
style5.setBottomBorderColor( 
IndexedColors.BLUE.getIndex()); 
style5.setBorderLeft(XSSFCellStyle.BORDER_DOUBLE); 
style5.setLeftBorderColor(  
IndexedColors.GREEN.getIndex()); 
style5.setBorderRight(XSSFCellStyle.BORDER_HAIR); 
style5.setRightBorderColor(  
IndexedColors.RED.getIndex()); 
style5.setBorderTop(XSSFCellStyle.BIG_SPOTS); 
style5.setTopBorderColor(  
Apache POI Tutorial 
49 
IndexedColors.CORAL.getIndex()); 
cell.setCellStyle(style5); 
//Fill Colors 
//background color 
row = spreadsheet.createRow((short) 10 ); 
cell = (XSSFCell) row.createCell((short) 1); 
XSSFCellStyle style6 = workbook.createCellStyle(); 
style6.setFillBackgroundColor( 
HSSFColor.LEMON_CHIFFON.index ); 
style6.setFillPattern(XSSFCellStyle.LESS_DOTS); 
style6.setAlignment(XSSFCellStyle.ALIGN_FILL); 
spreadsheet.setColumnWidth(1,8000); 
cell.setCellValue("FILL BACKGROUNG/FILL PATTERN"); 
cell.setCellStyle(style6); 
//Foreground color 
row = spreadsheet.createRow((short) 12); 
cell = (XSSFCell) row.createCell((short) 1); 
XSSFCellStyle style7=workbook.createCellStyle(); 
style7.setFillForegroundColor(HSSFColor.BLUE.index); 
style7.setFillPattern( XSSFCellStyle.LESS_DOTS); 
style7.setAlignment(XSSFCellStyle.ALIGN_FILL); 
cell.setCellValue("FILL FOREGROUND/FILL PATTERN"); 
cell.setCellStyle(style7); 
FileOutputStream out = new FileOutputStream( 
new File("cellstyle.xlsx"));  
workbook.write(out); 
out.close(); 
System.out.println("cellstyle.xlsx written successfully"); 
Apache POI Tutorial 
50 
Save the above code in a file named CellStyle.java, compile and execute it from 
the command prompt as follows. 
$javac CellStyle.java 
$java CellStyle 
It will  generate  an Excel  file named cellstyle.xlsx in  your  current directory  and 
display the following output.  
cellstyle.xlsx written successfully 
The cellstyle.xlsx file looks as follows. 
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