!!!java操作Excel导出大数据量解决方案
看过很多关于Excel导出时出现内存溢出的情况，也有很多解决方案。现提供如下解决方案，如有不妥，请指正：
该项目使用B/S架构，由于POI、JXL在导出excel大数据量情况下会产生大量对象最终导致内存溢出。其实Excel可以另存为html文件，保存为html后的文件内容如下： Html代码
<html xmlns="urn:schemas-microsoft-comfficeffice"
xmlns:x="urn:schemas-microsoft-comffice:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=ProgId content=Excel.Sheet>
<meta name=Generator content="Microsoft Excel 11">
……样式信息……
<body link=blue vlink=purple>
<table x:str border=0 cellpadding=0 cellspacing=0 width=620 style='border-collapse:
collapse;table-layout:fixed;width:466pt'>
<col width=129 style='mso-width-source:userset;mso-width-alt:4128;width:97pt'>
<col class=xl25 width=72 span=2 style='width:54pt'>
<col class=xl25 width=63 style='mso-width-source:userset;mso-width-alt:2016;
width:47pt'>
<col class=xl25 width=118 style='mso-width-source:userset;mso-width-alt:3776;
width:89pt'>
<col width=166 style='mso-width-source:userset;mso-width-alt:5312;width:125pt'>
<tr height=19 style='height:14.25pt'>
<td height=19 class=xl24 width=129 style='height:14.25pt;width:97pt'>字段1</td>
<td class=xl24 width=72 style='width:54pt'>字段2</td>
<td class=xl24 width=72 style='width:54pt'>字段3</td>
<td class=xl24 width=63 style='width:47pt'>字段4</td>
<td class=xl24 width=118 style='width:89pt'>字段5</td>
<td width=166 style='width:125pt'></td>
</tr>
……数据……
<![if supportMisalignedColumns]>
<tr height=0 style='display:none'>
<td width=129 style='width:97pt'></td>
<td width=72 style='width:54pt'></td>
<td width=72 style='width:54pt'></td>
<td width=63 style='width:47pt'></td>
<td width=118 style='width:89pt'></td>
<td width=166 style='width:125pt'></td>
</tr>
<![endif]>
</table>
</body>
</html>
<html xmlns="urn:schemas-microsoft-comfficeffice"
xmlns:x="urn:schemas-microsoft-comffice:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=ProgId content=Excel.Sheet>
<meta name=Generator content="Microsoft Excel 11">
……样式信息……
<body link=blue vlink=purple>
<table x:str border=0 cellpadding=0 cellspacing=0 width=620 style='border-collapse:
collapse;table-layout:fixed;width:466pt'>
<col width=129 style='mso-width-source:userset;mso-width-alt:4128;width:97pt'>
<col class=xl25 width=72 span=2 style='width:54pt'>
<col class=xl25 width=63 style='mso-width-source:userset;mso-width-alt:2016;
width:47pt'>
<col class=xl25 width=118 style='mso-width-source:userset;mso-width-alt:3776;
width:89pt'>
<col width=166 style='mso-width-source:userset;mso-width-alt:5312;width:125pt'>
<tr height=19 style='height:14.25pt'>
<td height=19 class=xl24 width=129 style='height:14.25pt;width:97pt'>字段1</td>
<td class=xl24 width=72 style='width:54pt'>字段2</td>
<td class=xl24 width=72 style='width:54pt'>字段3</td>
<td class=xl24 width=63 style='width:47pt'>字段4</td>
<td class=xl24 width=118 style='width:89pt'>字段5</td>
<td width=166 style='width:125pt'></td>
</tr>
……数据……
<![if supportMisalignedColumns]>
<tr height=0 style='display:none'>
<td width=129 style='width:97pt'></td>
<td width=72 style='width:54pt'></td>
<td width=72 style='width:54pt'></td>
<td width=63 style='width:47pt'></td>
<td width=118 style='width:89pt'></td>
<td width=166 style='width:125pt'></td>
</tr>
<![endif]>
</table>
</body>
</html>
至此，可通过数据生成如上格式的HTML文本信息则避开大量对象的建立，如果将该HTML直接以application/excel返回浏览器时则Excel文件会比普通大一点，可以通过配置过滤器对该HTML进行压缩即可，如下:
Java代码
response.reset();
response.setContentType("application/zip;charset=GBK");
String s = "查询-" + new java.sql.Date(System.currentTimeMillis()).toString().replaceAll("-","") + ".xls";
String filename = s + ".zip";
response.addHeader("Content-Disposition", "inline;filename=" + filename);
response.reset();
response.setContentType("application/zip;charset=GBK");
String s = "查询-" + new java.sql.Date(System.currentTimeMillis()).toString().replaceAll("-","") + ".xls";
String filename = s + ".zip";
response.addHeader("Content-Disposition", "inline;filename=" + filename);
该项目使用B/S架构，由于POI、JXL在导出excel大数据量情况下会产生大量对象最终导致内存溢出。其实Excel可以另存为html文件，保存为html后的文件内容如下： Html代码
<html xmlns="urn:schemas-microsoft-comfficeffice"
xmlns:x="urn:schemas-microsoft-comffice:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=ProgId content=Excel.Sheet>
<meta name=Generator content="Microsoft Excel 11">
……样式信息……
<body link=blue vlink=purple>
<table x:str border=0 cellpadding=0 cellspacing=0 width=620 style='border-collapse:
collapse;table-layout:fixed;width:466pt'>
<col width=129 style='mso-width-source:userset;mso-width-alt:4128;width:97pt'>
<col class=xl25 width=72 span=2 style='width:54pt'>
<col class=xl25 width=63 style='mso-width-source:userset;mso-width-alt:2016;
width:47pt'>
<col class=xl25 width=118 style='mso-width-source:userset;mso-width-alt:3776;
width:89pt'>
<col width=166 style='mso-width-source:userset;mso-width-alt:5312;width:125pt'>
<tr height=19 style='height:14.25pt'>
<td height=19 class=xl24 width=129 style='height:14.25pt;width:97pt'>字段1</td>
<td class=xl24 width=72 style='width:54pt'>字段2</td>
<td class=xl24 width=72 style='width:54pt'>字段3</td>
<td class=xl24 width=63 style='width:47pt'>字段4</td>
<td class=xl24 width=118 style='width:89pt'>字段5</td>
<td width=166 style='width:125pt'></td>
</tr>
……数据……
<![if supportMisalignedColumns]>
<tr height=0 style='display:none'>
<td width=129 style='width:97pt'></td>
<td width=72 style='width:54pt'></td>
<td width=72 style='width:54pt'></td>
<td width=63 style='width:47pt'></td>
<td width=118 style='width:89pt'></td>
<td width=166 style='width:125pt'></td>
</tr>
<![endif]>
</table>
</body>
</html>
<html xmlns="urn:schemas-microsoft-comfficeffice"
xmlns:x="urn:schemas-microsoft-comffice:excel"
xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=gb2312">
<meta name=ProgId content=Excel.Sheet>
<meta name=Generator content="Microsoft Excel 11">
……样式信息……
<body link=blue vlink=purple>
<table x:str border=0 cellpadding=0 cellspacing=0 width=620 style='border-collapse:
collapse;table-layout:fixed;width:466pt'>
<col width=129 style='mso-width-source:userset;mso-width-alt:4128;width:97pt'>
<col class=xl25 width=72 span=2 style='width:54pt'>
<col class=xl25 width=63 style='mso-width-source:userset;mso-width-alt:2016;
width:47pt'>
<col class=xl25 width=118 style='mso-width-source:userset;mso-width-alt:3776;
width:89pt'>
<col width=166 style='mso-width-source:userset;mso-width-alt:5312;width:125pt'>
<tr height=19 style='height:14.25pt'>
<td height=19 class=xl24 width=129 style='height:14.25pt;width:97pt'>字段1</td>
<td class=xl24 width=72 style='width:54pt'>字段2</td>
<td class=xl24 width=72 style='width:54pt'>字段3</td>
<td class=xl24 width=63 style='width:47pt'>字段4</td>
<td class=xl24 width=118 style='width:89pt'>字段5</td>
<td width=166 style='width:125pt'></td>
</tr>
……数据……
<![if supportMisalignedColumns]>
<tr height=0 style='display:none'>
<td width=129 style='width:97pt'></td>
<td width=72 style='width:54pt'></td>
<td width=72 style='width:54pt'></td>
<td width=63 style='width:47pt'></td>
<td width=118 style='width:89pt'></td>
<td width=166 style='width:125pt'></td>
</tr>
<![endif]>
</table>
</body>
</html>
至此，可通过数据生成如上格式的HTML文本信息则避开大量对象的建立，如果将该HTML直接以application/excel返回浏览器时则Excel文件会比普通大一点，可以通过配置过滤器对该HTML进行压缩即可，如下:
Java代码
response.reset();
response.setContentType("application/zip;charset=GBK");
String s = "查询-" + new java.sql.Date(System.currentTimeMillis()).toString().replaceAll("-","") + ".xls";
String filename = s + ".zip";
response.addHeader("Content-Disposition", "inline;filename=" + filename);
response.reset();
response.setContentType("application/zip;charset=GBK");
String s = "查询-" + new java.sql.Date(System.currentTimeMillis()).toString().replaceAll("-","") + ".xls";
String filename = s + ".zip";
response.addHeader("Content-Disposition", "inline;filename=" + filename);