使用java如何实现大量导出excel文件

package com.epay.utils;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();    }  }}