关于创建Excel表格问题（保存至指定文件/弹出直接打开还是下载，并可以选择保存路径的对话框）

本文主要是针对在Action中创建Excel表格，一种是直接将文件写入指定的路径，另一种是弹出直接打开还是下载，并可以选择保存路径的提示

第一步：导入poi包

第二步：编写代码

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.OutputStream;

import java.io.UnsupportedEncodingException;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;

import org.apache.poi.hssf.usermodel.HSSFRow;

import org.apache.poi.hssf.usermodel.HSSFSheet;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.redoor.da.facade.intf.ReportTemandhumInfoFacade;

import com.redoor.da.module.daservicemgr.vo.DaTemandhhumInfoVO;

public class CreateSimpleExcelToDisk extends ActionSupport{

private ReportTemandhumInfoFacade reportTemandhumInfoFacade;

private DaTemandhhumInfoVO temandhumInfo = new DaTemandhhumInfoVO();

public String exportReport() {

HttpServletRequest request = ServletActionContext.getRequest();

String tableName = request.getParameter("type"); //从页面中传过来的值

//第一步，创建一个webbook，对应一个Excel文件

HSSFWorkbook wb = new HSSFWorkbook();

//第二步，在webbook中添加一个sheet,对应Excel文件中的sheet

HSSFSheet sheet = wb.createSheet("历史数据监测表");

//第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short

HSSFRow row = sheet.createRow((int)0);

row.createCell((short)0).setCellValue(tableName); //第一行标题

HSSFRow row1 = sheet.createRow((int)1);

//第四步，创建单元格，并设置值表头 设置表头居中

HSSFCellStyle style = wb.createCellStyle();

style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //创建一个居中格式

HSSFCell cell = row1.createCell((short)0);

cell.setCellValue("温度"); cell.setCellStyle(style);

cell = row1.createCell((short)1);

cell.setCellValue("湿度"); cell.setCellStyle(style);

cell = row1.createCell((short)2);

cell.setCellValue("风速"); cell.setCellStyle(style);

cell = row1.createCell((short)3);

cell.setCellValue("太阳辐射"); cell.setCellStyle(style);

cell = row1.createCell((short)4);

cell.setCellValue("采集时间"); cell.setCellStyle(style);

//第五步，写入实体数据 实际应用中这些数据从数据库得到

List<DaTemandhhumInfoVO> daTemandhhumInfoVOslist = reportTemandhumInfoFacade.queryTemandhhumHisLineInfo(temandhumInfo);

for (int i = 0; i < daTemandhhumInfoVOslist.size(); i++)

{

row1 = sheet.createRow((int)i+2);

DaTemandhhumInfoVO info = daTemandhhumInfoVOslist.get(i);

//第四步，创建单元格，并设置值

row1.createCell((short)0).setCellValue(info.getTemperature());

row1.createCell((short)1).setCellValue(info.getHumidity());

row1.createCell((short)2).setCellValue(info.getWindvalue());

row1.createCell((short)3).setCellValue(info.getSunvalue());

row1.createCell((short)4).setCellValue(info.getCollecttime());

cell = row1.createCell((short)4);

cell.setCellValue(info.getCollecttime());

}

// 第六步，将文件存到指定位置

// try

// {

// FileOutputStream fout = new FileOutputStream("E:/"+tableName+"监测表.xls");

// wb.write(fout);

// fout.close();

// } catch (Exception e)

// {

// e.printStackTrace();

// }

// 弹出直接打开或者下载（可以选择文件下载保存路径）

HttpServletResponse response = ServletActionContext.getResponse();

response.reset();

response.setCharacterEncoding("UTF-8");

response.setContentType("application/vnd.ms-excel"); //保证不乱码

try

{

response.setHeader("Content-Disposition","attachment;" + " filename=" + new String(tableName.getBytes(), "ISO-8859-1"));

}

catch (UnsupportedEncodingException e1)

{

// TODO Auto-generated catch block

e1.printStackTrace();

}

try

{

ByteArrayOutputStream oss =new ByteArrayOutputStream();

OutputStream os = response.getOutputStream();

wb.write(oss);

byte temp[] = oss.toByteArray();

ByteArrayInputStream in = new ByteArrayInputStream(temp);

int n = 0;

while ((n = in.read(temp)) >0) {

os.write(temp, 0, n);

}

os.flush();

os.close();

} catch(Exception e)

{

e.printStackTrace();

}

return null; //这边返回值设置为null，否则可能会报错getOutputStream() has already been called for this response

}

//gettert setter方法

public ReportTemandhumInfoFacade getReportTemandhumInfoFacade()

{

return reportTemandhumInfoFacade;

}

public void setReportTemandhumInfoFacade(ReportTemandhumInfoFacade reportTemandhumInfoFacade)

{

this.reportTemandhumInfoFacade = reportTemandhumInfoFacade;

}

public DaTemandhhumInfoVO getTemandhumInfo()

{

return temandhumInfo;

}

public void setTemandhumInfo(DaTemandhhumInfoVO temandhumInfo)

{

this.temandhumInfo = temandhumInfo;

}

}

第三步：在web.xml中配置一下，添加下面几行代码

<mime-mapping>

<extension>xls</extension>

<mime-type>application/vnd.ms-excel</mime-type>

</mime-mapping>