使用poi操作导出excel代码示例

package codes;import java.io.IOException;import java.io.OutputStream;import java.sql.Timestamp;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletException;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.HSSFDataFormat;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;/*** * 通过AJAX示例,导出EXCEL示例： * JAVA中采用HSSFWorkbook创建EXCEL表格,设置输出格式输出 */public class ExportExcel_POI extends HttpServlet { private static final long serialVersionUID = 1L;  protected void service(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {  String method = request.getParameter("method");  if("prestartExcel".equals(method)){  prestartExcel(request, response);  }else if("downloadExcel".equals(method)){  downloadExcel(request, response);  } }   private void prestartExcel(HttpServletRequest request, HttpServletResponse response) {  //产生的Excel文件的名称  //产生工作簿对象  HSSFWorkbook workbook = new HSSFWorkbook();  //产生工作表对象  HSSFSheet sheet = workbook.createSheet();    //创建生成EXCEL头部  List<String> lists = getExcelHeader();  createExcelHeader(workbook, sheet, lists);//sheet表、单元格样式、数据集合    //创建生成EXCEL实体数据  Map<String, List<Object>> maps = getExcelBody();  createExcelBody(workbook, sheet, maps);//sheet表、body的数据集合    HttpSession session = request.getSession();  session.setAttribute("excel", workbook); }   private void createExcelHeader(HSSFWorkbook workbook, HSSFSheet sheet, List<String> lists) {  //设置第一个工作表的名称为firstSheet  workbook.setSheetName(0,"自动化设备检修");  sheet.setDefaultColumnWidth(15);//设置默认每一列的宽度  //sheet.setDefaultRowHeight((short) (20 * 20));//设置默认每一行的行高  //产生第二个工作表对象 HSSFSheet sheet2 = workbook.createSheet();   //设置第二个工作表的名称为secondSheet  workbook.setSheetName(1,"自动化设备检修2");  //设置单元格样式：可以对字体、前景色、背景色等设置，参考POI的API  HSSFCellStyle cellStyle = workbook.createCellStyle();  HSSFFont font = workbook.createFont();  font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//设置粗体  cellStyle.setFont(font);  HSSFRow row = sheet.createRow(0);  HSSFCell cell = null;  for(int i = 0;i < lists.size();i++){   cell = row.createCell(i);   cell.setCellValue(lists.get(i));   cell.setCellStyle(cellStyle);  } }   private void createExcelBody(HSSFWorkbook workbook, HSSFSheet sheet, Map<String, List<Object>> maps) {  //定义单元格样式  HSSFCellStyle cellStyle = workbook.createCellStyle();  HSSFDataFormat dataFormat = workbook.createDataFormat();  cellStyle.setDataFormat(dataFormat.getFormat("yyyy-mm-dd hh:mm"));//时间格式  cellStyle.setAlignment(HSSFCellStyle.ALIGN_LEFT);//对齐方式    HSSFRow row;  HSSFCell cell;  int rows = maps.keySet().size();  List<Object> bodylist = null;  int index = 0;  for(int i = 0;i < rows;i++){   bodylist = maps.get(String.valueOf(i));   if(bodylist != null){    row = sheet.createRow(++index);    for(int j = 0;j < bodylist.size();j++){     cell = row.createCell(j);     Object data = bodylist.get(j) == null? "" : bodylist.get(j);     if(data != null && "java.sql.Timestamp".equals(data.getClass().getName())){//判断如果为时间格式则：      Date date = new Date(((Timestamp)data).getTime());      cell.setCellValue(date);      cell.setCellStyle(cellStyle);     }else{//如果为null、string则：     cell.setCellValue(data.toString());     }    }   }  } }   /***  * 从SESSION中取出EXCEL  * @param request  * @param response  * @throws IOException  */ private void downloadExcel(HttpServletRequest request, HttpServletResponse response) throws IOException{  String filename = "自动化系统设备检修流程";  HttpSession session = request.getSession();  HSSFWorkbook workbook = (HSSFWorkbook)session.getAttribute("excel");  OutputStream out = response.getOutputStream();// 取得输出流     response.reset();// 清空输出流     response.setCharacterEncoding("UTF-8");  //设置返回的头字段:http协议inline采用浏览器方式打开、attachment采用本地EXCEL方式打开  response.setHeader("Content-disposition", "inline;filename = " + java.net.URLEncoder.encode(filename, "UTF-8") + ".xls");  //response.setHeader("Content-disposition", "attachment;filename = " + java.net.URLEncoder.encode(filename, "UTF-8") + ".xls");  response.setContentType("application/vnd.ms-excel;charset=UTF-8");//定义输出类型   workbook.write(out);  out.flush();  out.close(); }   /***  * 准备导出EXCEL的头部数据  * @return  */ private List<String> getExcelHeader(){  List<String> lists = new ArrayList<String>();  lists.add("申请单号");lists.add("单位名称");  lists.add("设备名称");lists.add("所属系统名称");  lists.add("电压等级");lists.add("紧急程度");  lists.add("维护内容");lists.add("处理日期");  return lists; }   /***  * 准备导出EXCEL的实体数据  * @return  */ private Map<String, List<Object>> getExcelBody(){  Map<String, List<Object>> maps = new HashMap<String, List<Object>>();  Date date = new Date();//模拟日期数据  Timestamp timestamp = Timestamp.valueOf(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date));  Object[][] tabledate = {   {"ZDH_001","变电站1","110kV设备","系统1","220kV","一般","nr_1",timestamp},   {"ZDH_002","变电站2","111kV设备","系统2","330kV","紧急","nr_2",timestamp},   {"ZDH_003","变电站3","112kV设备","系统3","440kV","紧急","nr_3",timestamp},   {"ZDH_004","变电站4","113kV设备","系统4","550kV","一般","nr_4",timestamp},   {"ZDH_006","变电站5","114kV设备","系统5","660kV","紧急","nr_5",timestamp},   {"ZDH_007","变电站6","115kV设备","系统6","770kV","一般","nr_6",timestamp},   {"ZDH_008","变电站7","116kV设备","系统7","880kV","紧急","nr_7",null},   {"ZDH_009","变电站8","117kV设备","系统8","990kV","一般","nr_8",timestamp}  };  Object[] contents = null;  List<Object> lists = null;  for(int i = 0;i < tabledate.length;i++){//循环行数   contents = tabledate[i];   lists = new ArrayList<Object>();   for(int j = 0;j < contents.length;j++){//循环列数   lists.add(contents[j]);   }   System.out.print("index: " + i + "  ");   maps.put(String.valueOf(i), lists);//存放：行号、该行记录内容  }  System.out.println();  return maps; }}

 参考：http://blog.csdn.net/cunxiyuan108/article/details/8168211