使用struts2和poi导出excel文档

poi眼下应该是比較流行的操作excel的工具了。这几天做了个struts2和poi结合使用来实现导出excel的功能。个人认为还是比較有用的。代码阅读起来也非常easy。下来就来分享下我的心得

1  struts2的下载excel文件机制

struts2的action中使用poi和输入输出流把二进制数据通过流的形式响应给client。client浏览器作出响应的处理，如弹出文件下载对话框

2  poi的用法

poi解析或生成excel网上资料特别多，这里我就不给出代码了

3 struts文件的相关配置

<result name="export"  type="stream"> 
	<param name="contentType">application/xls;charset=UTF-8</param>
	<param name="contentDisposition">attachment;filename="${downloadFileName}"</param>
	<param name="inputName">excelFile</param>
</result>

4  action的主要内容

（1）相关属性的getter和setter方法

private InputStream excelFile;
private String downloadFileName=String.valueOf(Calendar.getInstance().getTimeInMillis())+".xls";

public InputStream getExcelFile() {
		return excelFile;
}
public void setExcelFile(InputStream excelFile) {
	this.excelFile = excelFile;
}

public String getDownloadFileName() {
	return downloadFileName;
}

public void setDownloadFileName(String downloadFileName) {
	this.downloadFileName = downloadFileName;
}

public void  ExcelFile(String startCardNum,String num) throws Exception  {   
		
		HSSFWorkbook workbook = new HSSFWorkbook();
		HSSFSheet sheet = workbook.createSheet();
		HSSFRow row = sheet.createRow(0);
		//单元格和工作薄名称都要设置下编码。否则有中文的时候就会出现乱码
		workbook.setSheetName(0, "卡号信息表" , HSSFWorkbook.ENCODING_UTF_16);
		
		HSSFCell cell1=row.createCell((short)0);
		cell1.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
		cell1.setCellValue("卡号");
		HSSFCell cell2=row.createCell((short)1);
		cell2.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
		cell2.setCellValue("password");
		HSSFCell cell3=row.createCell((short)2);
		cell3.setEncoding(HSSFWorkbook.ENCODING_UTF_16);
		cell3.setCellValue("创建时间");
	
		
		
		//取得符合条件的卡号信息
		List<Card> all=cardService.queryCardByCondition(startCardNum, num);
		Iterator<Card> it=all.iterator();
		int j=1;
		SimpleDateFormat sdf =   new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		while(it.hasNext()){
			
			row=sheet.createRow(j);
			Card c=it.next();
			
				row.createCell((short)0).setCellValue(c.getCardNum());
				row.createCell((short)1).setCellValue(c.getPassword());
				row.createCell((short)2).setCellValue(sdf.format(c.getCreateDate()));
			
			j++;
		}
		
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		try {
			
			workbook.write(baos);
 
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] aa = baos.toByteArray();
		excelFile = new ByteArrayInputStream(aa,0,aa.length); 
		try {
			baos.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
}

（3）导出excel的总方法

public String exportCardInfo() throws Exception {
		String startNum=this.getRequest().getParameter("startCardNum");
		String num=this.getRequest().getParameter("num");
		ExcelFile(startNum,num);
		this.setDownloadFileName(String.valueOf(Calendar.getInstance().getTimeInMillis())+".xls");
		return "export";
}