利用poi匯出百萬資料

	public void print() throws IOException{
		Long startTime = System.currentTimeMillis();
		HpaDAO oDao = (HpaDAO) this.getDao("daoHpa");
		List<Hpa> dataList = oDao.find("from Hpa o");
		Workbook wb = new SXSSFWorkbook(1000); //重點在這句 .每1000條寫一個臨時檔案
		Sheet sheet = wb.createSheet("我的第一個工作簿");
		Row nRow =null;
		Cell nCell = null;
		int rowNo = 0;
		short colNo = 0;
		for(Hpa hpa : dataList){
			colNo = 0;
			nRow = sheet.createRow(rowNo++);
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getId());
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getBreast());
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getAdipocytes());
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getNegative());
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getStaining());
			
			nCell = nRow.createCell(colNo++);
			nCell.setCellValue(hpa.getSupportive());
			if(rowNo%1000==0){
				System.out.println(rowNo);
			}
		}


		//生成excel檔案
		ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();//生成流物件
		wb.write(byteArrayOutputStream);
		
		//工具類 , 封裝彈出下載框:
		String outFile = "bigdata.xls";
		DownloadBase downloadBase = new DownloadBase();
		HttpServletResponse response = ServletActionContext.getResponse();
		downloadBase.download(byteArrayOutputStream, response, outFile);
		
		
		Long stopTime = System.currentTimeMillis();
		System.out.println((stopTime-startTime)+"ms");

	}
 

本人實測104萬的資料 用時18秒到 excel

注意點:

Workbook wb = new SXSSFWorkbook(1000); //重點在這句 .每1000條寫一個臨時檔案

匯入jar包：


核心包：
poi-3.9-20121203.jar
poi-ooxml-3.9-20121203.jar
poi-ooxml-schemas-3.9-20121203.jar


依賴包：
commons-beanutils-1.7.0.jar
commons-collections-3.0.jar
commons-lang-2.0.jar
commons-logging-1.0.4.jar
dom4j-1.6.1.jar
standard-1.0.2.jar
stax-api-1.0.1.jar
xmlbeans-2.3.0.jar
mysql-connector-java-5.1.10-bin.jar
junit-4.8.2.jar