POI操作Excel文档（三）

自己写的例子：
/**
 * add a contact_member
 */
package com.lawstar.lxdx.service;import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;import com.lawstar.lxdx.dao.ContactMemberDAO;
import com.lawstar.lxdx.pojo.ExportMemberPOJO;
import com.lawstar.lxdx.util.Tools;/**
 * @author sunny
 * 
 */
public class ImportContactMemberServlet extends BaseService { private static final long serialVersionUID = 1L;
 public String filepath ;
 public void init() throws ServletException {
 } public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  doPost(request, response);
 }  public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  String group = request.getParameter("groups");
  String []groups = group.split(",");
  boolean isMultipart = ServletFileUpload.isMultipartContent(request);//检查是否是一个文件上传请求   
  if (isMultipart) {
    //设置filepath
    filepath = getServletContext().getRealPath("/cac") ;
    //从request中读取excel表格,保存到服务器
    uploadExcelFromRequest(request);
    
    //将联系方式导入到数据库中,不合格的存到List中
    List<ExportMemberPOJO> exportList = exportListFromExcel( groups);
    
    if(exportList==null||0==exportList.size()||exportList.isEmpty()){
     //都成功
     response.sendRedirect("/jsp/import_member.jsp?export=unexport");
    }else{
     //将不合格的联系方式写到export.xls中
     exportListToExcel(exportList);
     response.sendRedirect("/jsp/import_member.jsp?export=export");
    }
  } else {
   response.sendRedirect("/jsp/import_member.jsp?export=noupload"); 
  }  
 } public void destroy() {
  this.closeConn();
 }
 /**
  * 将不合格的联系方式写到export.xls中
  * @param exportList
  */
 public void exportListToExcel(List<ExportMemberPOJO> exportList){
  File srcFile = new File(filepath + File.separator );
  if (!srcFile.exists()) {
   srcFile.mkdir();
  }
  HSSFWorkbook wbEx = new HSSFWorkbook();//初始化
  HSSFSheet sheetEx = wbEx.createSheet("不合格通讯方式");//新建,命名一个工作单
  sheetEx.setColumnWidth((short)0,(short)2000);
  sheetEx.setColumnWidth((short)1,(short)3000);
  sheetEx.setColumnWidth((short)2,(short)3000);
  HSSFRow row = sheetEx.createRow((short) 0);//创建第一行
  row.createCell((short) 0).setCellValue(new HSSFRichTextString("姓名"));
  row.createCell((short) 1).setCellValue(new HSSFRichTextString("电话"));
  row.createCell((short) 2).setCellValue(new HSSFRichTextString("未添加原因"));
  int size = exportList.size();
  for (int e=0 ;e<size;e++){
   ExportMemberPOJO ex = exportList.get(e);
   HSSFRow addRow = sheetEx.createRow((short) (e+1));//创建第一行
   addRow.createCell((short) 0).setCellValue(new HSSFRichTextString(ex.getUsername()));
   addRow.createCell((short) 1).setCellValue(new HSSFRichTextString(ex.getTelephone()));
   addRow.createCell((short) 2).setCellValue(new HSSFRichTextString(ex.getMessage()));
  }
  FileOutputStream fileOut;
  //把生成的文件写到服务器上
  try {
   fileOut = new FileOutputStream(filepath + File.separator + "export.xls");
   wbEx.write(fileOut);
   fileOut.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 /**
  * 将联系方式导入到数据库中,不合格的存到List中，返回
  * @return
  */
 public List<ExportMemberPOJO>  exportListFromExcel(String [] groups){
  //读取import.xls文件中的数据同时生产export.xls文件
  FileInputStream inputStream;
  List<ExportMemberPOJO> exportList = new ArrayList();
  try {
   inputStream = new FileInputStream(filepath + File.separator + "import.xls");
  
   ByteArrayOutputStream byteOS = new ByteArrayOutputStream();
   
   byte[] buffer = new byte[1024];
   int count;
   while ((count = inputStream.read(buffer)) != -1)
    byteOS.write(buffer, 0, count);
   byteOS.close();
   byte[] allBytes = byteOS.toByteArray();
   // create workbook from array:
   ByteArrayInputStream byteIS = new ByteArrayInputStream(allBytes);
   HSSFWorkbook wb = new HSSFWorkbook(byteIS);
   HSSFSheet sheet = wb.getSheetAt(0);
   
//   this.conn = getConn();
   conn.setAutoCommit(false);
   int rows = sheet.getPhysicalNumberOfRows();
   
   for (int i=1;i< rows ;i++){
    HSSFRow row = sheet.getRow(i);
    int cells = row.getLastCellNum();
    HSSFCell nameCell = row.getCell((short)0);
    HSSFCell telCell = row.getCell((short)1);
    String username = nameCell.getRichStringCellValue().getString();
    String telephone = String.valueOf((int)telCell.getNumericCellValue());
    ContactMemberDAO cmdao = new ContactMemberDAO(this.conn);
    int has = cmdao.hasThisMember(username, telephone);
    switch (has) {
     case 0: {//可以添加
      boolean suc = cmdao.insertMember(username, telephone,groups);
      break;
     }
     case 1:{//
      ExportMemberPOJO exportMember = new ExportMemberPOJO();
      exportMember.setTelephone(telephone);
      exportMember.setUsername(username);
      exportMember.setMessage("该人名已有，请单独添加。谢谢合作！");
      exportList.add(exportMember);
      break;
     }
     case 2: {
      ExportMemberPOJO exportMember = new ExportMemberPOJO();
      exportMember.setTelephone(telephone);
      exportMember.setUsername(username);
      exportMember.setMessage("通讯录中已经有此手机号，不能添加");
      exportList.add(exportMember);
      break;
     }
     case 3:
      break;
     default:
      break;
    }
   }
   conn.commit();
   return exportList;
  } catch(SQLException se){
   try {
    conn.rollback();
   } catch (SQLException e1) {
    e1.printStackTrace();
   }
  }catch (Exception e) {
   e.printStackTrace();
  } 
  finally {
   return exportList;
  }
 }
 
 public void uploadExcelFromRequest(HttpServletRequest request){
  DiskFileItemFactory dff = new DiskFileItemFactory();// 创建该对象
  dff.setRepository(new File(filepath));// 指定上传文件的临时目录
  dff.setSizeThreshold(1024000000);// 指定在内存中缓存数据大小,单位为byte
  ServletFileUpload sfu = new ServletFileUpload(dff);// 创建该对象
  sfu.setFileSizeMax(2100000000);// 指定单个上传文件的最大尺寸
  sfu.setSizeMax(1000000000);// 指定一次上传多个文件的总尺寸
  FileItemIterator fii;
  try {
   fii = sfu.getItemIterator(request);
  // 解析request请求,并返回FileItemIterator集合
   while (fii.hasNext()) {
    FileItemStream fis = fii.next();// 从集合中获得一个文件流
    if (!fis.isFormField() && fis.getName().length() > 0) {// 过滤掉表单中非文件域
     //---------------------文件传到服务器---------------------
     BufferedInputStream in = new BufferedInputStream(fis.openStream());// 获得文件输入流
     BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(new File(filepath + File.separator + "import.xls")));// 获得文件输出流
     Streams.copy(in, out, true);// 开始把文件写到你指定的上传文件夹 
    }
   }
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (FileUploadException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
 }
}