How to create liferay hook

hi

Export data in excel formate using java

import  java.io.*;
import  org.apache.poi.hssf.usermodel.HSSFSheet;
import  org.apache.poi.hssf.usermodel.HSSFWorkbook;
import  org.apache.poi.hssf.usermodel.HSSFRow;
import  org.apache.poi.hssf.usermodel.HSSFCell;

public class CreateExcelFile{
public static void main(String[]args){
try{
String filename="c:/hello.xls" ;
HSSFWorkbook hwb=new HSSFWorkbook();
HSSFSheet sheet =  hwb.createSheet("new sheet");

HSSFRow rowhead=   sheet.createRow((short)0);
rowhead.createCell((short) 0).setCellValue("SNo");
rowhead.createCell((short) 1).setCellValue("First Name");
rowhead.createCell((short) 2).setCellValue("Last Name");
rowhead.createCell((short) 3).setCellValue("Username");
rowhead.createCell((short) 4).setCellValue("E-mail");
rowhead.createCell((short) 5).setCellValue("Country");

HSSFRow row=   sheet.createRow((short)1);
row.createCell((short) 0).setCellValue("1");
row.createCell((short) 1).setCellValue("jaid");
row.createCell((short) 2).setCellValue("shaik");
row.createCell((short) 3).setCellValue(mpowerglobal);
row.createCell((short) 4).setCellValue("jaid.sk@gmail.com");
row.createCell((short) 5).setCellValue("India");

FileOutputStream fileOut =  new FileOutputStream(filename);
hwb.write(fileOut);
fileOut.close();
System.out.println("Your excel file has been generated!");

} catch ( Exception ex ) {
System.out.println(ex);

}
}
}



For the above file you need poi library for that go through this link:
http://www.apache.org/dyn/closer.cgi/poi/release/bin/poi-bin-3.7-20101029.zip

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