POI插入多个sheet

今天需要做一个导出excel的功能，还是使用POI进行导入，但是要导出一个excel中的多个sheet中。所以就做下标记咯。FileOutputStream fileOut = null;

		FileInputStream fileIn = null;
		fileIn = new FileInputStream(new File(sourceFilePath));
		fileOut=new FileOutputStream(new File(localFilePath));
		HSSFWorkbook wbIn = null;
		wbIn=new HSSFWorkbook(fileIn);
		HSSFCellStyle cellStyle=wbIn.createCellStyle();
		HSSFFont font = wbIn.createFont();   //设置字体的样式
        font.setFontHeightInPoints((short)10);   //字体大小
        cellStyle.setFont(font);
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        cellStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        HSSFSheet sheet=null;
        HSSFRow row=null;
        for(int i=0,j=ls.size();i<j;i++){
        	if(i==0){
                sheet = wbIn.getSheet("发货汇总");
        	}else if(i==1){
        		sheet = wbIn.getSheet("根据出厂时间统计每月返厂数量");
        	}else{
        		sheet = wbIn.getSheet("根据返厂时间统计每月返厂数量");
        	}
        	ResultCollection rc=ls.get(i);
        	for(int k=0,l=rc.getRowSize();k<l;k++){
        		row=sheet.createRow((short)k+1);
        		row.createCell(0).setCellValue(k);
            	row.createCell(1).setCellValue(Integer.parseInt(rc.getCell(k, 0)));
            	row.createCell(2).setCellValue(new HSSFRichTextString(rc.getCell(k, 1)));
            	row.createCell(3).setCellValue(new HSSFRichTextString(rc.getCell(k, 2)));
            	if(i>0){
            		row.createCell(4).setCellValue(new HSSFRichTextString(rc.getCell(k, 4)));
            		row.createCell(5).setCellValue(Integer.valueOf(rc.getCell(k, 3)));
                	row.getCell(5).setCellStyle(cellStyle);
            	}else{
            		row.createCell(4).setCellValue(Integer.valueOf(rc.getCell(k, 3)));
            	}
            	row.getCell(0).setCellStyle(cellStyle);
            	row.getCell(1).setCellStyle(cellStyle);
            	row.getCell(2).setCellStyle(cellStyle);
            	row.getCell(3).setCellStyle(cellStyle);
            	row.getCell(4).setCellStyle(cellStyle);
        	}
        }
        wbIn.write(fileOut);
        fileOut.close();
        fileIn.close();