java将list<T>导出为xls文件

一.action层

/**
* 导出list
*/
@SuppressWarnings("unchecked")
public void exportBatch() {
request = ServletActionContext.getRequest();
response = ServletActionContext.getResponse();
String batchNo = request.getParameter("batchNo");


try {

//查询导出List<T>列
exportlList = this.batchService.findExportBatchService(batchNo);
} catch (Exception e) {
e.printStackTrace();
}

//导出表格
HSSFWorkbook wb = batchService.exportBatch(exportlList);
File xlsFile = new File("D://" + "fielName.xls");

try {
FileOutputStream fos = new FileOutputStream(xlsFile);
wb.write(fos);
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

try {
String fileName = "fielName.xls";
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/xls");
response.setHeader("Location", fileName);
response.setHeader("Content-Disposition", "attachment;fileName="+ new String((xlsFile.getName()).getBytes("UTF-8")));
ServletOutputStream os = response.getOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(os);
FileInputStream fis = new FileInputStream(xlsFile);
byte[] b = new byte[1000];
int length;
while ((length = fis.read(b)) > 0) {
bos.write(b, 0, length);
}
os.flush();
bos.flush();
os.close();
bos.close();
fis.close();
xlsFile.delete();
} catch (Exception e1) {
e1.printStackTrace();
}
}

二、serviceImpl层

/**
* 导出Excel
*/
@SuppressWarnings("deprecation")
public HSSFWorkbook exportBatch(List<SecurityCode> list) {

//获取客户端访问路径
String qRCodeUrl="http://www.baidu.com";

// 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

String cardInfoName = "sheet页名";

HSSFSheet sheet = wb.createSheet(cardInfoName);

// 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);

// 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 = row.createCell((short) 0);

//"列名一、"列名二、"列名三、"列名四、"列名五、"列名六。
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 1);
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 2);
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 3);
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 4);
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 5);
cell.setCellValue("列名一");
cell.setCellStyle(style);

cell = row.createCell((short) 6);
cell.setCellValue("列名一");
cell.setCellStyle(style);

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

row = sheet.createRow((int) i + 1);
SecurityCode m = list.get(i);
row.createCell((short) 0).setCellValue(i + 1);
row.createCell((short) 1).setCellValue(m.getBatchNo() == null || "null".equals(m.getBatchNo()) ? "" : m.getBatchNo().toString());
row.createCell((short) 2).setCellValue(m.getProductNo() == null || "null".equals(m.getProductNo() ) ? "" : m.getProductNo() .toString());
row.createCell((short) 3).setCellValue(m.getProductName() == null|| "null".equals(m.getProductName()) ? "" : m.getProductName().toString());
row.createCell((short) 4).setCellValue(m.getCreateTime() == null|| "null".equals(m.getCreateTime()) ? "" : m.getCreateTime().toString());
row.createCell((short) 5).setCellValue(m.getSecurityNo() == null|| "null".equals(m.getSecurityNo()) ? "" : m.getSecurityNo().toString());
row.createCell((short) 6).setCellValue(qRCodeUrl == null|| "null".equals(qRCodeUrl) ? "" :qRCodeUrl.toString()+m.getSecurityNo());
}

return wb;

}