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。