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();}}}