java海量数据导出xls分页解决报内存溢出问题

    /**

     * 写XLS文件

     * @param fileName 文件名（全路径）

     * @param colTitleList 标题

     * @param colPorpertyList 如果属性列 为NULL，则resultData 中的每个元素为一个LIST

     * @param resultData 数据

     * @throws Exception

     */

    public static void writeXLS(HttpServletResponse response,String fileName,List colTitleList,List colPorpertyList,List resultData) throws Exception  {

        if (resultData == null)

            resultData = new ArrayList();

        System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>"+fileName+" data count="+resultData.size());

    int maxCount = 65536;//每页数据最多65536行

    boolean bNeedTitle = true;//每页是否要加上标题一行

        if (colTitleList == null || colTitleList.size() ==0)

        bNeedTitle = false;

       

    HSSFWorkbook workBook = new HSSFWorkbook();

    int nDataPerPage = maxCount;//每页数据条数.

    if (bNeedTitle)

    nDataPerPage = maxCount-1;

    //SHEET数

    int sheetCount = resultData.size()/nDataPerPage;

    if (resultData.size()%nDataPerPage!=0)

    sheetCount++;

   

    //如果无数据，则只添加标题行

    if (sheetCount == 0){

       HSSFSheet sheet = workBook.createSheet("sheet0");

            if (bNeedTitle){

                HSSFRow row = sheet.createRow(0);

                addSheetRow(colTitleList,row);

            }

    }

    OutputStream ouputStream = null;

    int rowIndex = 0;//当前数据写到第几行的索引值

    for(int i=0;i<sheetCount;i++) {

    System.out.println("页码======"+i);

    HSSFSheet sheet = workBook.createSheet("sheet"+i);

  

    int dIndex = 0;

    //添加标题

    if (bNeedTitle){
    HSSFRow row = sheet.createRow(dIndex++);
    addSheetRow(colTitleList,row);

    }

   

    //添加数据

    while(dIndex < maxCount) {

    //System.out.println("条数"+dIndex);

    HSSFRow tempRow = sheet.createRow(dIndex++);//建立新行

    List rowDataObj = null;

    if (colPorpertyList == null)//如果没有传属性列，则resultData 中的每个元素为一个LIST

       rowDataObj = (List)resultData.get(rowIndex++);

    else rowDataObj= getRowData(colPorpertyList,resultData.get(rowIndex++));

       addSheetRow(rowDataObj,tempRow);

       

    //全部写完了

        if (rowIndex == resultData.size())break;

    }

    }

   

    ouputStream = response.getOutputStream();
//数据流输出
response.setContentType("application/vnd.ms-excel");  
response.setHeader("Content-disposition", "attachment;filename ="+fileName+".xls"); 
workBook.write(ouputStream);
ouputStream.flush();  
ouputStream.close();
//OutputStream fos = new BufferedOutputStream(new FileOutputStream(new File("D:/down/aa.xls")),1024);
//workBook.write(fos);
//fos.flush();
//fos.close();
    }

/**

     * 添加标题

     * @param colTitleList

     * @param row

     */

    private static void addSheetRow(List rowDataList,HSSFRow row){

    if (rowDataList == null || rowDataList.size() == 0)return;
Iterator tIter = rowDataList.iterator();
int index = 0;
while (tIter.hasNext()) {
HSSFCell cell = row.createCell((short)index++);
//cell.setEncoding(HSSFCell.ENCODING_UTF_16);
cell.setCellValue(String.valueOf(tIter.next()));
}

    }

经测试 下载一百多万的数据 查询要一分半 导出要三分钟左右，不会报内存溢出  但是数据量太大 xls 文件无法打开  推荐把文件分开放入zip中。