java中使用poi导出数据到EXCEL模板中。

package business.component.check.controller;
import accel.common.core.spring.util.ResourceUtils;
import accel.common.data.jdbc.Dao;
import accel.common.webapp.security.Auth;
import business.commons.util.MapUtils;
import business.component.channel.domain.SecUser;
import business.component.check.domain.QdCheckChannel;
import business.component.check.domain.QdCheckRetailer;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import java.util.*;

public class ExcelController{

public ModelAndView eXcel(@RequestParam Map<String, Object> paramMap,HttpServletRequest

request ,HttpServletResponse response)throws Exception {

SecUser secUser = Auth.getUser();
boolean flag = false;

String checkType = request.getParameter("checkType");
byte[] bytes = checkType.getBytes("iso8859-1");//把乱码反向编码得回正确的二进制
checkType = new String(bytes, "utf-8");//拿着二进制自己去查utf-8, 得出正确的字符
String checkMonth = MapUtils.getString(paramMap, "checkMonth");
String pkId = MapUtils.getString(paramMap, "pkId");
String type = MapUtils.getString(paramMap, "type");

//数据表
QdCheckChannel newqd = new QdCheckChannel();
newqd.setPkId(pkId);
newqd.setCheckType(checkType);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM");//时间格式的转换
try {
newqd.setCheckMonth(dateFormat.parse(checkMonth));
} catch (ParseException e) {
e.printStackTrace();
}

//获取文件名和模板
String templateName = "check-franchise-template.xlsx";//EXCEL模板的名字
String fileName = "特许经营考核评分表.xlsx";//导出时下载的EXCEL文件名

QdCheckChannel qdCheckChannel = Dao.load(QdCheckChannel.class, pkId);
Map<String, String> map = new HashMap<String, String>();
map.put("fromId", pkId);
List<QdCheckRetailer> retailers = Dao.listBySql(QdCheckRetailer.class,

"query.clerk.retailer.list", map);
//从数据中取出所要导出的数据存放在List集合对象中

InputStream inputStream = new FileInputStream(ResourceUtils.getFile

("classpath:template/" + templateName));
//读取模板文件

Workbook wb = null;
try {
wb = new XSSFWorkbook(inputStream);//根据不同的excel版本采用不同的Workbook

Sheet sheet = wb.getSheetAt(0);//读取模板中的sheet内容
//在相应的单元格进行赋值
for (int i = 0; i < retailers.size(); i++) {//对数据进行循环导出
org.apache.poi.ss.usermodel.Row row = sheet.getRow(2 + i);

//模板表头占用两行，i为第一条数据 从第三行开始
if (row == null) {
row = sheet.createRow(2 + i);
row.createCell(0).setCellValue(i+1);
row.createCell(1).setCellValue(checkMonth);
row.createCell(2).setCellValue(retailers.get(i).getRetailerCode());
row.createCell(3).setCellValue(retailers.get(i).getAddress());
} else {
row.getCell(0).setCellValue(i+1);
row.getCell(1).setCellValue(checkMonth);
row.getCell(2).setCellValue(retailers.get(i).getRetailerCode());
row.createCell(3).setCellValue(retailers.get(i).getAddress());
}
}

} catch (Exception ex) {
wb = new HSSFWorkbook(inputStream);
//读取了模板内所有sheet内容
HSSFSheet sheet = (HSSFSheet) wb.getSheetAt(0);
//在相应的单元格进行赋值
for (int i = 0; i < retailers.size(); i++) {
HSSFRow row = sheet.getRow(2 + i);
if (row == null) {
row = sheet.createRow(2 + i);
row.createCell(0).setCellValue(i+1);
row.createCell(1).setCellValue(checkMonth);
row.createCell(2).setCellValue(retailers.get(i).getRetailerCode());
row.createCell(3).setCellValue(retailers.get(i).getAddress());
} else {
row.getCell(0).setCellValue(i+1);
row.getCell(1).setCellValue(checkMonth);
row.getCell(2).setCellValue(retailers.get(i).getRetailerCode());
row.createCell(3).setCellValue(retailers.get(i).getAddress());
}
}
}

OutputStream output = response.getOutputStream();
response.reset();
fileName = URLEncoder.encode(fileName, "UTF-8");
response.setContentType("applicationnd/msexcel");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment; filename=\"" +

fileName + "\"");//下载文件
wb.write(output);//写入到Excel模板文件中
output.close();//关闭

return null;

}