java导出大批量(百万以上)数据的excel文件

本文实例为大家分享了java导出百万以上数据的excel文件，供大家参考，具体内容如下

1.传统的导出方式会消耗大量的内存,2003每个sheet页最多65536条数据,2007每个sheet页可以达到100万条数据以上,2007会在生成Workbook时清理数据,所以2007导出量更大;

2.可以导出多个excel文件到某个目录中,然后打包下载;

3.导出excel格式的xml文件,这种方式可以分批导出数据,适用于大批量数据的导出,以下简单介绍这种方式:

代码如下:

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("<?xml version=\"1.0\" encoding=\"GBK\" ?>");
      sb.append("\n");
      sb.append("<?mso-application progid=\"Excel.Sheet\"?>");
      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();
    }
  }
}

导出xml文件之后直接修改后缀名为.xlsx就可以直接打开,弊端:无法导出.xls格式的excel文件.以上只是一种简单想法,留待以后具体实现.

扩展:既然可以使用xml文件导出excel,那么导出csv文件之后也可以直接改后缀名为.xls,目前只是一种想法,尚未证实可行性.

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。