java使用poi实现大数据量导出为EXCEL

//这个zip打包工具类
package net.szh.zip;  
  
import java.io.File;  
  
import org.apache.tools.ant.Project;  
import org.apache.tools.ant.taskdefs.Zip;  
import org.apache.tools.ant.types.FileSet;  
  
public class ZipCompressorByAnt {  
  
    private File zipFile;  
  
    public ZipCompressorByAnt(String pathName) {  
        zipFile = new File(pathName);  
    }  
      
    public void compress(String srcPathName) {  
        File srcdir = new File(srcPathName);  
        if (!srcdir.exists())  
            throw new RuntimeException(srcPathName + "不存在！");  
          
        Project prj = new Project();  
        Zip zip = new Zip();  
        zip.setProject(prj);  
        zip.setDestFile(zipFile);  
        FileSet fileSet = new FileSet();  
        fileSet.setProject(prj);  
        fileSet.setDir(srcdir);  
        //fileSet.setIncludes("**/*.java"); 包括哪些文件或文件夹 eg:zip.setIncludes("*.java");  
        //fileSet.setExcludes(...); 排除哪些文件或文件夹  
        zip.addFileset(fileSet);  
          
        zip.execute();  
    }  
}

   import java.util.Map;

    import com.eos.common.transaction.ITransactionManager;
    import com.eos.common.transaction.TransactionManagerFactory;
    import com.eos.system.annotation.Bizlet;
    import com.pns.framework.dao.Dao;
    import com.pns.framework.execl.Excel;
    import com.pns.framework.filepath.ExportExeclUtil;
    import com.pns.framework.filepath.FilePath;
    import commonj.sdo.DataObject;
    @Bizlet("")
    public class Aeanalysis {    
        private  ExportExeclUtil util= new ExportExeclUtil();
        /**
         * 变电站
         *
         */
        @Bizlet("")
        public String export4boassets(Map<String,String> map,String nameSqlid) {
             String tempFileName ;
             String fileName ;
             ITransactionManager manager = TransactionManagerFactory.getTransactionManager();
             
             DataObject[] objects={};
            try {
                /**
                 *在这儿得到总共的条数，再除每个文件的条数，得到需要多少个文件，求余如果不为零，
                 *则需要循环的次数即为文件数，如果不为零则为文件数+1；文件写完之后进行压缩                 
                 *，把压缩文件的地址返回到流的jsp中。
                 */
                tempFileName = FilePath.getTempFilePath("02_02_01.xls");//零时文件   例：xxx.xls
                fileName = FilePath.getTemplatePath("aeanalysis/uic01_001.xls");//模板文件       例： pamanagement/uic02_001_004.xls
                manager.begin();
                objects = Dao.query(nameSqlid, map);
                manager.commit();
                //变电站标识    电网变电站标识    变电站名称    电压等级    变电站地址    管理单位    运行状态    变电站标识    变电站业务系统ID    变电站名称    电压等级    变电站地址    管理单位    运行状态    备注
                String[] fieldArrStr = new String[] {"SUBS_ID", "PMS_SUBS_ID", "SUBS_NAME", "VOLT_CODE","SUBS_ADDR","ORG_NAME","RUN_STATUS","PMS_ID","PMS_GLOBEID",
                        "PMS_SUBS_NAME","PMS_VOLT_CODE","PMS_SUBS_ADDR","PMS_ORG_NAME","PMS_RUN_STATUS",
                        "REMARK"};
             util.exportExcelToTemp(fileName, 2, objects, fieldArrStr, tempFileName);
            } catch (RuntimeException e) {
                manager.rollback();
                tempFileName="ex";
            }
             
             return tempFileName;
        }
        /**
     * 生成只有数据的execl到临时文件夹下
     * 
     * @param args
     * @throws IOException
     */
    public  boolean exportExcelToTemp(String temFile,int beginRowIndex,Object[] objects,String[] fieldArrStr,String tempPath) {
        boolean flag;
        FileOutputStream fos = null;
        
        try {
            this.getWorkBook(temFile);
            this.getSheet();
            this.setDataRow(beginRowIndex, objects, fieldArrStr);
            fos = new FileOutputStream(tempPath);
            workBook.write(fos);
            flag=true;
        } catch (IOException e) {
            // TODO 自动生成 catch 块
            flag=false;
        } finally {
            try {
                if(fos != null){
                    fos.close();
                }
                
            } catch (IOException e) {
                // TODO 自动生成 catch 块
                e.printStackTrace();
            }
        }
        return flag;
    }
  }

<%@page pageEncoding="UTF-8"
%><%@page contentType="text/plain; charset=utf-8" 
%><%@page import="org.apache.commons.fileupload.*" 
%><%@page import="java.net.URLEncoder"
%><%@page import="java.io.BufferedOutputStream"
%><%@page import="java.io.FileInputStream"
%><%@page import="java.io.IOException"
%><%@page import="java.util.Date"
%><%@page import="java.text.SimpleDateFormat"
%>
<%String path =request.getParameter("path");
    String filename=request.getParameter("filename");
    //String time=request.getParameter("time");
    response.reset();//可以加也可以不加
    response.setContentType("application/x-download");
    filename = URLEncoder.encode(filename,"UTF-8");
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
    String dd=df.format(new Date());
    //System.out.println(dd);// new Date()为获取当前系统时间
    
    response.addHeader("Content-Disposition", "p_w_upload; filename=" +dd+"_"+filename);
    
    BufferedOutputStream bos = null;  
    FileInputStream fis = null;  
    try {   
        fis = new FileInputStream(path);  
        bos = new BufferedOutputStream(response.getOutputStream());  
        byte[] buffer = new byte[1024];  
        while(fis.read(buffer) != -1){  
              bos.write(buffer);  
        }  
        response.flushBuffer();
        out.clear();
    }catch(IOException e) {  
        e.printStackTrace();  
    }finally {  
         fis.close();
        bos.close();
    }%>