java根据模板生成Excel文件

public static void TemplateExcelExport(List<Dealer> lists, HttpServletResponse response, HttpServletRequest request) {
OutputStream outputStream = null;
try {
//模板路径
String templatePath = request.getSession().getServletContext().getRealPath("/")+ "ExcelTemplate\\Excel模板.xls"; 

//生成的Excel路径
String rootPath = request.getSession().getServletContext().getRealPath("/");
String path = rootPath + "Download";
File filePath =new File(path);    
//如果文件夹不存在则创建    
if  (!filePath .exists()  && !filePath .isDirectory())      
{       
   filePath .mkdir();    
} 
String fileName = filePath + "\\" + (new Date()).getTime() + ".xls";
File file = new File(fileName);
outputStream = new FileOutputStream(file);

templateWrite(outputStream, response, request, lists, templatePath);

//弹出下载框
download(fileName, response);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

}

/**
* 根据模板生成Excel
*/
public static void templateWrite(OutputStream outputStream, HttpServletResponse response, HttpServletRequest request, List<Dealer> lists, String templatePath) throws IOException {
//获取所读取excel模板的对象
File fi = new File(templatePath); 
if(!fi.exists()){ 
return;  
}   
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(fi));  
// 初始一个workbook
HSSFWorkbook workbook = new HSSFWorkbook(fs);   
// 获取sheet
HSSFSheet sheet = workbook.getSheetAt(0);
//获取标题
HSSFRow rowTitle = sheet.getRow(0);
HSSFCellStyle style = workbook.createCellStyle();
rowTitle.setRowStyle(style);
 
// 创建多行
int rowIndex = 1;
for (Dealer list : lists) {
HSSFRow row = sheet.createRow(rowIndex);


// 创建多列
HSSFCell cell0 = row.createCell(0);
cell0.setCellValue(list.getCode());
HSSFCell cell1 = row.createCell(1);
cell1.setCellValue(list.getName());
HSSFCell cell2 = row.createCell(2);
cell2.setCellValue(list.getShortName());
HSSFCell cell3 = row.createCell(3);
cell3.setCellValue(list.getAddDate().toString());
HSSFCell cell4 = row.createCell(4);
cell4.setCellValue(list.getNote());

rowIndex++;
}


   workbook.write(outputStream);  
}


/**
* 下载
*/
private static void download(String path, HttpServletResponse response) {
try {
// path是指欲下载的文件的路径。
File file = new File(path);
// 取得文件名。
String filename = file.getName();
// 以流的形式下载文件。
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/vnd.ms-excel;charset=gb2312");
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}