private File file; //上传的文件private String fileFileName; //文件名称private String fileContentType; //文件类型/*** 导出数据* @return*/public String exportData(){formBean=this.provinceInfoServiceImpl.searchAll(formBean);List<TProvinceinfo> exprotData = formBean.getResultList();session.put("exprotData", exprotData);return SUCCESS;}/*** 导入数据* @return* @throws Exception*/public String importData() throws Exception{//创建文件输入流对象FileInputStream is = new FileInputStream(file) ;//通过输入流创建工作簿HSSFWorkbook workBook = new HSSFWorkbook(is);HSSFSheet sheet = workBook.getSheetAt(0);//获取总行数int totalRowNum = sheet.getLastRowNum();//这里i<==   循环遍历导入工作簿行数 取出相关数据for (int i = 0; i <= totalRowNum; i++) {HSSFRow row = sheet.getRow(i);for (int j = 0; j < row.getLastCellNum(); j++) {//打印出导入的内容
                System.out.print(row.getCell(j));}System.out.println("");}dataMap.put("uploadResult", true);return SUCCESS;}

package com.lmy.servlet;import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;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 com.hy.entity.TProvinceinfo;public class Download extends HttpServlet {/*** The doGet method of the servlet. <br>** This method is called when a form has its tag value method equals to get.* * @param request the request send by the client to the server* @param response the response send by the server to the client* @throws ServletException if an error occurred* @throws IOException if an error occurred*/public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");response.setContentType("application/vnd.ms-excel;charset=UTF-8");response.setHeader("Content-Disposition", "attachment;filename=exportData.xls"); ServletOutputStream outStream = response.getOutputStream();//创建工作簿HSSFWorkbook workbook = new HSSFWorkbook();HSSFSheet sheet = workbook.createSheet("省数据");HttpSession session = request.getSession();//从session中获取相关数据List<TProvinceinfo>exprotData=(List<TProvinceinfo>) session.getAttribute("exprotData");//初始化标题List<String> title = new ArrayList<String>(3);title.add("省级ID");title.add("省级名称");title.add("备注");//创建行HSSFRow row = sheet.createRow(0);//创建单元格HSSFCell cell = row.createCell(0);////赋值cell.setCellValue(title.get(0));HSSFCell cell1 = row.createCell(1);//
        cell1.setCellValue(title.get(0));HSSFCell cell2 = row.createCell(2);//
        cell2.setCellValue(title.get(2));for (int i = 1; i <= exprotData.size(); i++) {//循环数据 创建对应行数据HSSFRow rows = sheet.createRow(i);//创建行HSSFCell cells1 = rows.createCell(0);//
                cells1.setCellValue(exprotData.get(i-1).getFProvinceID());HSSFCell cells2 = rows.createCell(1);//
                cells2.setCellValue(exprotData.get(i-1).getFProviceName());HSSFCell cells3 = rows.createCell(2);//
                cells3.setCellValue(exprotData.get(i-1).getFRemark());}//导出工作簿
        workbook.write(outStream);outStream.flush();outStream.close();}}