使用POI实现数据导出Excel表格

 package cn.sh.bzt.kwj.action;

 import java.io.IOException;
 import java.io.OutputStream;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.List;

 import javax.annotation.Resource;

 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFCellStyle;
 import org.apache.poi.hssf.usermodel.HSSFFont;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;

 import cn.sh.bzt.base.action.BaseAction;
 import cn.sh.bzt.base.page.Pager;
 import cn.sh.bzt.base.page.PagerHelp;
 import cn.sh.bzt.kwj.pojo.TEnterprise;
 import cn.sh.bzt.kwj.pojo.TOrgnization;
 import cn.sh.bzt.kwj.pojo.TUser;
 import cn.sh.bzt.kwj.service.IUserService;
 import cn.sh.bzt.kwj.service.TotalFormService;

 /**
  * 统计报表--行政统计
  * @author 姚智韧
  *
  */
 @SuppressWarnings("serial")
 public class TotalFormAction extends BaseAction {

 //    private Log log = LogFactory.getLog(TEnterpriseIdAction.class);// 日志类
     private List<TEnterprise> list = null;
     private TEnterprise enterprise = new TEnterprise();

     private String projectCode = "33";
     private String licenseName = "口岸卫生许可证核发 ";
     private String childNodeCode = "3300";
     private String childNodeName = "无";
     public OutputStream out;

     public TEnterprise getEnterprise() {
         return enterprise;
     }

     public void setEnterprise(TEnterprise enterprise) {
         this.enterprise = enterprise;
     }

     private TotalFormService totalFormService;

     public TotalFormService getTotalFormService() {
         return totalFormService;
     }

     @Resource(name = "totalFormServiceImpl")
     public void setTotalFormService(TotalFormService totalFormService) {
         this.totalFormService = totalFormService;
     }

     private IUserService userService;

     public IUserService getUserService() {
         return userService;
     }

     @Resource(name = "userServiceImpl")
     public void setUserService(IUserService userService) {
         this.userService = userService;
     }

     /**
      * 查询行政统计数据
      *
      * @return
      */
     public String findAllTotalForm() {
         try {
             TUser user = (TUser) request.getSession().getAttribute(
                     "USER_IN_SESSION");
             request.setAttribute("userLoginName", user.getUserLoginName());

             TOrgnization toi = new TOrgnization();
             Integer i = user.getTOrgnization().getOrgId();
             if (i != null) {
                 toi = userService.getAllOrgList(i);
             }
             request.setAttribute("orgName", toi.getOrgName());

             request.getSession().setAttribute("companyName", "");
             request.getSession().setAttribute("stDate", "");
             request.getSession().setAttribute("endDate","");
             // 总行数
             int totalRows = totalFormService.getTotalFormCount(enterprise);
             System.out.println("总行数totalRows----->" + totalRows);

             Pager pager = PagerHelp.getPager(request, totalRows);
             pager.setUrl("tjbb/findAllTotalForm.action");

             list = new ArrayList<TEnterprise>();
             list = ListUtils(enterprise, pager);
             System.out.println("list----->" + list.get(0));
             request.setAttribute("ALL_Total_LIST", list);
             request.setAttribute("PAGE", pager);
             return SUCCESS;
         } catch (Exception e) {
             request.setAttribute("ERROR_CAUSE", "数据库操作失败");
             return ERROR;
         }
     }

     /**
      * 按条件查询
      *
      * @return
      */
     public String findByCondition() {
         try {
             TUser user = (TUser) request.getSession().getAttribute(
                     "USER_IN_SESSION");
             request.setAttribute("userLoginName", user.getUserLoginName());
             TOrgnization toi = new TOrgnization();
             Integer i = user.getTOrgnization().getOrgId();
             if (i != null) {
                 toi = userService.getAllOrgList(i);
                 request.setAttribute("orgName", toi.getOrgName());
             }

             String filingdate1 = request.getParameter("enterprise.filingdate1");
             System.out.println("filingdate1------->" + filingdate1);

             String filingdate2 = request.getParameter("enterprise.filingdate2");
             System.out.println("filingdate2------->" + filingdate2);

             String companyName = request.getParameter("enterprise.companyName");

             enterprise.setFilingdate1(convertFormat(filingdate1));
             enterprise.setFilingdate2(convertFormat(filingdate2));

             request.getSession().setAttribute("companyName", companyName);
             request.getSession().setAttribute("stDate", filingdate1);
             request.getSession().setAttribute("endDate",filingdate2);

             // 总行数
             int totalRows = totalFormService.getTotalFormCount(enterprise);
             System.out.println("总行数totalRows----->" + totalRows);

             Pager pager = PagerHelp.getPager(request, totalRows);

             list = new ArrayList<TEnterprise>();
             list = ListUtils(enterprise, pager);
             request.setAttribute("ALL_Total_LIST", list);
             request.setAttribute("PAGE", pager);
             System.out.println("list---->" + list.get(0));
             return SUCCESS;
         } catch (Exception e) {
             request.setAttribute("ERROR_CAUSE", "数据库操作失败");
             e.printStackTrace();
             return ERROR;
         }

     }

     /**
      * 导出数据到Excel
      * @param model
      * @throws IOException
      * @throws Exception
      */
     public String exportDataToExcel() throws IOException {
         try {
             response.setCharacterEncoding("UTF-8");
             String filename = "统计报表-行政统计.xls";
             HSSFWorkbook wb = new HSSFWorkbook();
             response.setContentType("application/x-download");
             try {
                 response.setHeader("Content-Disposition", "attachment;filename="
                         + new String(filename.getBytes("gbk"), "iso-8859-1"));
             } catch (Exception e1) {
                 e1.printStackTrace();
             }
             HSSFSheet sheet = wb.createSheet("行政统计一");
             // 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
             HSSFFont font = wb.createFont();
             font.setFontName("宋体");
             font.setFontHeightInPoints((short) 16);

             HSSFCellStyle style = wb.createCellStyle();
             style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

             HSSFCell cell = row.createCell((short) 0);
             cell.setCellValue("许可项目代码");
             cell.setCellStyle(style);
             cell = row.createCell((short) 1);
             cell.setCellValue("许可项目代码");
             cell.setCellStyle(style);
             cell = row.createCell((short) 2);
             cell.setCellValue("子项代码");
             cell.setCellStyle(style);
             cell = row.createCell((short) 3);
             cell.setCellValue("子项名称");
             cell.setCellStyle(style);
             cell = row.createCell((short) 4);
             cell.setCellValue("许可证书编号");
             cell.setCellStyle(style);
             cell = row.createCell((short) 5);
             cell.setCellValue("许可项目及范围");

             cell = row.createCell((short) 6);
             cell.setCellValue("发证日期");
             cell.setCellStyle(style);
             cell = row.createCell((short) 7);
             cell.setCellValue("有效期至");
             cell.setCellStyle(style);
             cell = row.createCell((short) 8);
             cell.setCellValue("生产地址");
             cell.setCellStyle(style);
             cell = row.createCell((short) 9);
             cell.setCellValue("发证机构 ");
             cell.setCellStyle(style);
             cell = row.createCell((short) 10);
             cell.setCellValue("发证机构代码");
             cell.setCellStyle(style);
             cell = row.createCell((short) 11);
             cell.setCellValue("被许可机构");
             cell.setCellStyle(style);
             cell = row.createCell((short) 12);
             cell.setCellValue("被许可机构代码(证件号码) ");
             cell.setCellStyle(style);
             cell = row.createCell((short) 13);
             cell.setCellValue("被许可机构行政区划 ");
             cell.setCellStyle(style);

             String filingdate1 = (String) request.getSession().getAttribute("stDate");
             System.out.println("filingdate1------->" + filingdate1);

             String filingdate2 = (String) request.getSession().getAttribute("endDate");
             System.out.println("filingdate2------->" + filingdate2);

             String companyName = (String) request.getSession().getAttribute("companyName");
             System.out.println("companyName------->" + companyName);

             enterprise.setFilingdate1(convertFormat(filingdate1));
             enterprise.setFilingdate2(convertFormat(filingdate2));
             enterprise.setCompanyName(companyName);
             list = new ArrayList<TEnterprise>();

             list = totalFormService.findExportData(enterprise);

             for (int i = 0; i < list.size(); i++)
             {
                 row = sheet.createRow((int) i + 1);
                 TEnterprise enterprise = (TEnterprise) list.get(i);
                 String managescope = enterprise.getApprovalmanagescope();
                 String managescope1 = null;
                 if(managescope!=null){
                     managescope1 = managescope.substring(1, managescope.length()-1);
                 }else{
                     managescope1 = managescope;
                 }
                 // 第四步，创建单元格，并设置值
                 row.createCell((short) 0).setCellValue(projectCode);  //许可项目代码
                 row.createCell((short) 1).setCellValue(licenseName);  //许可项目代码
                 row.createCell((short) 2).setCellValue(childNodeCode); //子项代码
                 row.createCell((short) 3).setCellValue(childNodeName);//子项名称
                 row.createCell((short) 4).setCellValue(enterprise.getLicenseCode());  //许可证书编号
                 row.createCell((short) 5).setCellValue(managescope1);  //许可项目及范围
                 row.createCell((short) 6).setCellValue(enterprise.getJdTime());  //发证日期
                 row.createCell((short) 7).setCellValue(enterprise.getInDate());  //有效期至
                 row.createCell((short) 8).setCellValue(enterprise.getBusinessAddress()); //生产地址
                 row.createCell((short) 9).setCellValue(enterprise.getEmbranchment());//发证机构
                 row.createCell((short) 10).setCellValue(enterprise.getOrgCode());  //发证机构代码
                 row.createCell((short) 11).setCellValue(enterprise.getCompanyName());  //被许可机构
                 row.createCell((short) 12).setCellValue(enterprise.getLegalPersonCard()); //被许可机构代码 (证件号码)
                 row.createCell((short) 13).setCellValue(enterprise.getAdminZoning());//被许可机构行政区划
             }
             System.out.println("导出表格的数据大小---->"+list.size());
             request.setAttribute("ALL_Total_LIST", list);
             out = response.getOutputStream();
             wb.write(out);
             if(((filingdate1!=null)||(filingdate2!=null)||(companyName!=null))&&((filingdate1!=null)&&(filingdate2!=null))){
                 out.close();
                 return "EXPORT";
             }else{
                 out.close();
                 return SUCCESS;
             }

         } catch (Exception e) {
             e.printStackTrace();
             return ERROR;
         }

     }
     /**
      * 获取经处理后的list
      * @return
      */
     public List<TEnterprise> ListUtils(TEnterprise  enterprise, Pager pager){
         try {
             list = new ArrayList<TEnterprise>();

             // 得到行政统计List
             List<TEnterprise> tList = totalFormService.findAll(enterprise,
                     pager);
             for (int j = 0; j < tList.size(); j++) {
 //                System.out.println("遍历list--------->");
                 enterprise = tList.get(j);
                 String jdTime = enterprise.getJdTime();
 //                System.out.println("jdTime------>" + jdTime);
                 String inDate = enterprise.getInDate();
 //                System.out.println("inDate------>" + inDate);
                 if (inDate != null) {
                     String jzTime2 = convertDate(jdTime, new Integer(inDate));
                     enterprise.setInDate(convertFormat(jzTime2));
                 } else {
                     enterprise.setInDate("");
                 }
                 String managescope = enterprise.getApprovalmanagescope();
                 if(managescope!=null){
                     String managescope1 = managescope.substring(1, managescope.length()-1);
                     enterprise.setApprovalmanagescope(managescope1);
                 }
                 list.add(enterprise);
             }
             return list;
         }catch (Exception e) {
             e.printStackTrace();
             return null;
         }

     }

     /**
      * 日期转换 将yyyy-MM-dd格式日期转换成yyyy年MM月dd日
      *
      * @param jdTime
      * @return
      * @throws Exception
      */
     public String convertFormat(String jdTime) throws Exception {
         // Calendar objCalendar = Calendar.getInstance();
         Date objDate = new SimpleDateFormat("yyyy-MM-dd").parse(jdTime);

         SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");

         String jdTime2 = sdf.format(objDate);
         System.out.println("jdTime2---->" + jdTime2);
         return jdTime2;
     }

     /**
      * 日期转换函数 将数据库中日期格式为“yyyy年MM月日”加上天数得到"yyyy-MM-dd"格式数据
      * @param jdTime  发证日期
      * @param inDate  有效期
      * @return
      * @throws Exception
      */
     public String convertDate(String jdTime, int inDate) throws Exception {
         System.out.println("进入日期转换函数----->" + 1111111);

         Calendar objCalendar = Calendar.getInstance();
         Date objDate = new SimpleDateFormat("yyyy年MM月dd日").parse(jdTime);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

         SimpleDateFormat sdf0 = new SimpleDateFormat("yyyy");
         SimpleDateFormat sdf1 = new SimpleDateFormat("MM");
         SimpleDateFormat sdf2 = new SimpleDateFormat("dd");
         int year = Integer.parseInt(sdf0.format(objDate));
         int month = Integer.parseInt(sdf1.format(objDate));
         int date = Integer.parseInt(sdf2.format(objDate));
         // System.out.println(Integer.valueOf(inDate).intValue());
         objCalendar.set(year, month - 1, date);
         objCalendar.add(Calendar.DATE, inDate);
         System.out.println("Calendar.DATE---------->" + Calendar.DATE);
         objDate = objCalendar.getTime();
         System.out.println("objDate---->" + objDate);
         String jzTime = sdf.format(objDate);
         System.out.println("截止日期--->" + jzTime);
         return jzTime;
     }

 }

代码仅供参考，在CSDN下有个大牛实现数据导出时，可以实现图片等的导出，还可以既本地调用和在WEB服务器端用Servlet的调用。详情可参考(http://blog.csdn.net/lenotang/article/details/2823230)