使用java如何实现大量导出excel文件

package com.epay.utils;

/**
 * 大数据量导出成EXCEL或XML
 * @author qad
 * 2017-04-22
 */
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test {
  public static void main(String[] args) {
    StringBuffer sb = new StringBuffer();
    try {
      DataOutputStream rafs = new DataOutputStream(
          new BufferedOutputStream(new FileOutputStream(new File(
              "d://test.xls"))));
      sb.append("<&#63;xml version=\"1.0\" encoding=\"GBK\" &#63;>");
      sb.append("\n");
      sb.append("<&#63;mso-application progid=\"Excel.Sheet\"&#63;>");
      sb.append("\n");
      sb.append("<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"");
      sb.append("\n");
      sb.append(" xmlns:o=\"urn:schemas-microsoft-com:office:office\"");
      sb.append("\n");
      sb.append(" xmlns:x=\"urn:schemas-microsoft-com:office:excel\"");
      sb.append("\n");
      sb.append(" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\"");
      sb.append("\n");
      sb.append(" xmlns:html=\"http://www.w3.org/TR/REC-html40\">");
      sb.append("\n");
      sb.append("<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\"> ");
      sb.append("\n");
      sb.append(" <Styles>\n");
      sb.append(" <Style ss:ID=\"Default\" ss:Name=\"Normal\">\n");
      sb.append("  <Alignment ss:Vertical=\"Center\"/>\n");
      sb.append("  <Borders/>\n");
      sb.append("  <Font ss:FontName=\"宋体\" x:CharSet=\"134\" ss:Size=\"12\"/>\n");
      sb.append("  <Interior/>\n");
      sb.append("  <NumberFormat/>\n");
      sb.append("  <Protection/>\n");
      sb.append(" </Style>\n");
      sb.append(" </Styles>\n");
      int sheetcount = 0;
      int recordcount = 65535;
      int currentRecord = 0;
      int total = 100000;
      int col = 20;
      sb.append("<Worksheet ss:Name=\"Sheet0\">");
      sb.append("\n");
      sb.append("<Table ss:ExpandedColumnCount=\"" + col
          + "\" ss:ExpandedRowCount=\"" + total
          + "\" x:FullColumns=\"1\" x:FullRows=\"1\">");
      sb.append("\n");
      for (int i = 0; i < total; i++) {
        if ((currentRecord == recordcount
            || currentRecord > recordcount || currentRecord == 0)
            && i != 0) {// 一个sheet写满
          currentRecord = 0;
          rafs.write(sb.toString().getBytes());
          sb.setLength(0);
          sb.append("</Table>");
          sb.append("<WorksheetOptions xmlns=\"urn:schemas-microsoft-com:office:excel\">");
          sb.append("\n");
          sb.append("<ProtectObjects>False</ProtectObjects>");
          sb.append("\n");
          sb.append("<ProtectScenarios>False</ProtectScenarios>");
          sb.append("\n");
          sb.append("</WorksheetOptions>");
          sb.append("\n");
          sb.append("</Worksheet>");
          sb.append("<Worksheet ss:Name=\"Sheet" + i / recordcount
              + "\">");
          sb.append("\n");
          sb.append("<Table ss:ExpandedColumnCount=\"" + col
              + "\" ss:ExpandedRowCount=\"" + recordcount
              + "\" x:FullColumns=\"1\" x:FullRows=\"1\">");
          sb.append("\n");
        }
        sb.append("<Row>");
        for (int j = 0; j < col; j++) {
          System.out.println(i);
          sb.append("<Cell><Data ss:Type=\"String\">111</Data></Cell>");
          sb.append("\n");
        }
        sb.append("</Row>");
        if (i % 5000 == 0) {
          rafs.write(sb.toString().getBytes());
          rafs.flush();
          sb.setLength(0);
        }
        sb.append("\n");
        currentRecord++;
      }
      rafs.write(sb.toString().getBytes());
      sb.setLength(0);
      sb.append("</Table>");
      sb.append("<WorksheetOptions xmlns=\"urn:schemas-microsoft-com:office:excel\">");
      sb.append("\n");
      sb.append("<ProtectObjects>False</ProtectObjects>");
      sb.append("\n");
      sb.append("<ProtectScenarios>False</ProtectScenarios>");
      sb.append("\n");
      sb.append("</WorksheetOptions>");
      sb.append("\n");
      sb.append("</Worksheet>");
      sb.append("</Workbook>");
      sb.append("\n");
      rafs.write(sb.toString().getBytes());
      rafs.flush();
      rafs.close();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}