ExcelUtils第二種寫法

package util;


import java.io.InputStream;
import java.sql.ResultSet;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;


import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;


public class ExcelUtil {

public static void fillExcelData(ResultSet rs,Workbook wb,String[] headers)throws Exception{
int rowIndex=0;
Sheet sheet=wb.createSheet();
Row row=sheet.createRow(rowIndex++);
for(int i=0;i<headers.length;i++){
row.createCell(i).setCellValue(headers[i]);
}
while(rs.next()){
row=sheet.createRow(rowIndex++);
for(int i=0;i<headers.length;i++){
row.createCell(i).setCellValue(rs.getObject(i+1).toString());
}
}
}

public static Workbook fillExcelDataWithTemplate(ResultSet rs,String templateFileName)throws Exception{
InputStream inp=ExcelUtil.class.getResourceAsStream("/template/"+templateFileName);
POIFSFileSystem fs=new POIFSFileSystem(inp);
Workbook wb=new HSSFWorkbook(fs);
Sheet sheet=wb.getSheetAt(0);
// 獲取列數
int cellNums=sheet.getRow(0).getLastCellNum();
int rowIndex=1;
while(rs.next()){
Row row=sheet.createRow(rowIndex++);
for(int i=0;i<cellNums;i++){
row.createCell(i).setCellValue(rs.getObject(i+1).toString());
}
}
return wb;
}

public static String formatCell(HSSFCell hssfCell){
if(hssfCell==null){
return "";
}else{
if(hssfCell.getCellType()==HSSFCell.CELL_TYPE_BOOLEAN){
return String.valueOf(hssfCell.getBooleanCellValue());
}else if(hssfCell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){
return String.valueOf(hssfCell.getNumericCellValue());
}else{
return String.valueOf(hssfCell.getStringCellValue());
}
}
}


public static String getCell(HSSFCell cell) {
DecimalFormat df = new DecimalFormat("#");
if (cell == null)
return "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_NUMERIC:
if(HSSFDateUtil.isCellDateFormatted(cell)){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
return sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue())).toString();
}
return df.format(cell.getNumericCellValue());
case HSSFCell.CELL_TYPE_STRING:
System.out.println(cell.getStringCellValue());
return cell.getStringCellValue();
case HSSFCell.CELL_TYPE_FORMULA:
return cell.getCellFormula();
case HSSFCell.CELL_TYPE_BLANK:
return "";
case HSSFCell.CELL_TYPE_BOOLEAN:
return cell.getBooleanCellValue() + "";
case HSSFCell.CELL_TYPE_ERROR:
return cell.getErrorCellValue() + "";
}
return "";
}
/*public static String formateDate(HSSFWorkbook wb,HSSFCell hssfCell){
//HSSFWorkbook wb = new HSSFWorkbook();  
CreationHelper createHelper=wb.getCreationHelper();
HSSFCellStyle cellStyle = wb.createCellStyle();  
cellStyle.setDataFormat(createHelper.createDataFormat().getFormat("yyyy-mm-dd hh:mm:ss"));
//HSSFSheet sheet = wb.createSheet("format sheet");  
//HSSFDataFormat format = wb.createDataFormat();  
//HSSFRow row = sheet.createRow(0);  
//HSSFCell cell = row.createCell(0);  
//cell = row.getCell(2);
hssfCell.setCellValue(formatCell(hssfCell));
hssfCell.setCellStyle(cellStyle);  
return hssfCell.getStringCellValue();
}
*/
}