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