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Create Excel file in java using PoI

2015-06-06 15:14 363 查看

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package com.howto;

import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

/*
* Here we will learn how to create Excel file and header for the same.
*/
public class CreateExcelFile {

int rownum = 0;
HSSFSheet firstSheet;
Collection<File> files;
HSSFWorkbook workbook;
File exactFile;

{
workbook = new HSSFWorkbook();
firstSheet = workbook.createSheet("FIRST SHEET");
Row headerRow = firstSheet.createRow(rownum);
headerRow.setHeightInPoints(40);
}

public static void main(String args[]) throws Exception {

List<String> headerRow = new ArrayList<String>();
headerRow.add("Employee No");
headerRow.add("Employee Name");
headerRow.add("Employee Address");

List<String> firstRow = new ArrayList<String>();
firstRow.add("1111");
firstRow.add("Gautam");
firstRow.add("India");

List<List> recordToAdd = new ArrayList<List>();
recordToAdd.add(headerRow);
recordToAdd.add(firstRow);

CreateExcelFile cls = new CreateExcelFile(recordToAdd);
cls.createExcelFile();
}

void createExcelFile(){
FileOutputStream fos = null;
try {
fos=new FileOutputStream(new File("ExcelSheet.xls"));
HSSFCellStyle hsfstyle=workbook.createCellStyle();
hsfstyle.setBorderBottom((short) 1);
hsfstyle.setFillBackgroundColor((short)245);
workbook.write(fos);
} catch (Exception e) {
e.printStackTrace();
}
}

CreateExcelFile(List<List> l1) throws Exception {

try {

for (int j = 0; j < l1.size(); j++) {
Row row = firstSheet.createRow(rownum);
List<String> l2= l1.get(j);

for(int k=0; k<l2.size(); k++)
{
Cell cell = row.createCell(k);
cell.setCellValue(l2.get(k));
}
rownum++;
}

} catch (Exception e) {
e.printStackTrace();
} finally {
}

}
}

PoI Jar will be required. Jar can be downloaded from Apache website.

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