Java大批量导出数据,格式可以为xml或excel.
最近项目中用到大数据量导出功能.不能确定到底有多大,最少十来万条记录.
100M的excel文件,excel2003已经不能够打开了,只能用2007版.不知道后期数据量更大的时候怎么办.废话不多说,上代码.Copy别人的.以备以后使用.

package com.epay.utils;/** * 大数据量导出成EXCEL或XML * @author J.W * 2011-06-08 */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.xml"))));sb.append("<?xml version=\"1.0\"?>");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(" <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 = 20;int currentRecord = 0;int total = 100;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();}}}

文件格式可以自定义,改成XML或者excel都可以, 代码复制到eclipse可以直接运行.还需要再研究研究poi导出.完了以后做个比较,顺便记录下来.