【POI】导出excel（不依赖于框架）

使用的是spring mvc

1.首先配置需要的jar包（使用的是POI报表）

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.12</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.12</version>
</dependency>

2.使用的util类ExcelFileGenerator

/**
* 系统数据导出Excel 生成器
* @version 1.0
*/

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;

import java.io.OutputStream;
import java.util.ArrayList;

public class ExcelFileGenerator {

private final int SPLIT_COUNT = 65536; //Excel每个工作簿的行数

private ArrayList<String> fieldName = null; //excel标题数据集

private ArrayList<ArrayList<String>> fieldData = null; //excel数据内容

private HSSFWorkbook workBook = null;

/**
* 构造器
* @param fieldName 结果集的字段名
* @param fieldData
*/
public ExcelFileGenerator(ArrayList<String> fieldName, ArrayList<ArrayList<String>> fieldData) {

this.fieldName = fieldName;
this.fieldData = fieldData;
}

/**
* 创建HSSFWorkbook对象
* @return HSSFWorkbook
*/
public HSSFWorkbook createWorkbook() {

workBook = new HSSFWorkbook();//创建一个工作薄对象
int rows = fieldData.size();//总的记录数
int sheetNum = 0;           //指定sheet的页数

if (rows % SPLIT_COUNT == 0) {
sheetNum = rows / SPLIT_COUNT;
} else {
sheetNum = rows / SPLIT_COUNT + 1;
}

for (int i = 1; i <= sheetNum; i++) {//循环2个sheet的值
HSSFSheet sheet = workBook.createSheet("Page " + i);//使用workbook对象创建sheet对象
HSSFRow headRow = sheet.createRow((short) 0); //创建行，0表示第一行（本例是excel的标题）
for (int j = 0; j < fieldName.size(); j++) {//循环excel的标题
HSSFCell cell = headRow.createCell( j);//使用行对象创建列对象，0表示第1列
/**************对标题添加样式begin********************/
//设置列的宽度/
sheet.setColumnWidth(j, 6000);
HSSFCellStyle cellStyle = workBook.createCellStyle();//创建列的样式对象
HSSFFont font = workBook.createFont();//创建字体对象
//字体加粗
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//字体颜色变红
font.setColor(HSSFColor.RED.index);
//如果font中存在设置后的字体，并放置到cellStyle对象中，此时该单元格中就具有了样式字体
cellStyle.setFont(font);
/**************对标题添加样式end********************/

//添加样式
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
if(fieldName.get(j) != null){
//将创建好的样式放置到对应的单元格中
cell.setCellStyle(cellStyle);
cell.setCellValue((String) fieldName.get(j));//为标题中的单元格设置值
}else{
cell.setCellValue("-");
}
}
//分页处理excel的数据，遍历所有的结果
for (int k = 0; k < (rows < SPLIT_COUNT ? rows : SPLIT_COUNT); k++) {
if (((i - 1) * SPLIT_COUNT + k) >= rows)//如果数据超出总的记录数的时候，就退出循环
break;
HSSFRow row = sheet.createRow((short) (k + 1));//创建1行
//分页处理，获取每页的结果集，并将数据内容放入excel单元格
ArrayList<String> rowList = (ArrayList<String>) fieldData.get((i - 1) * SPLIT_COUNT + k);
for (int n = 0; n < rowList.size(); n++) {//遍历某一行的结果
HSSFCell cell = row.createCell( n);//使用行创建列对象
if(rowList.get(n) != null){
cell.setCellValue((String) rowList.get(n).toString());
}else{
cell.setCellValue("");
}
}
}
}
return workBook;
}

public void expordExcel(OutputStream os) throws Exception {
workBook = createWorkbook();
workBook.write(os);//将excel中的数据写到输出流中，用于文件的输出
os.close();
}

}

补充util方法，解决不同浏览器导出名乱码问题

//解决设置名称时的乱码
public static String <span style="color:#FF0000;">processFileName</span>(HttpServletRequest request, String fileNames) {
String codedfilename = null;
try {
String agent = request.getHeader("USER-AGENT");
if (null != agent && -1 != agent.indexOf("MSIE") || null != agent
&& -1 != agent.indexOf("Trident")) {// ie

String name = java.net.URLEncoder.encode(fileNames, "UTF8");

codedfilename = name;
} else if (null != agent && -1 != agent.indexOf("Mozilla")) {// 火狐,chrome等

codedfilename = new String(fileNames.getBytes("UTF-8"), "iso-8859-1");
}
} catch (Exception e) {
e.printStackTrace();
}
return codedfilename;
}

3.controller中调用

@Controller
@RequestMapping(value = "/egg")
public class EggController {
@RequestMapping(value = "/exportExcel",method = RequestMethod.POST)
public String exportExcel (@RequestParam("actId") Long actId,HttpServletRequest request,HttpServletResponse response,StatisticsCondition statisticsCondition,String customerCollItemsIds) throws Exception{
Long entId = CasUtils.getEntId(request);
if (statisticsCondition.getIsWin()==0){
statisticsCondition.setIsUse(0);
}
statisticsCondition.setTelephone(statisticsCondition.getTelephone().trim());
ArrayList<String> fieldName =new ArrayList<>();
fieldName.add("昵称");//这里生成数据的方式不太好，如果可以的话最好不要这么写
fieldName.add("openId");
fieldName.add("是否中奖");
fieldName.add("奖项等级");
fieldName.add("奖项名称");
fieldName.add("是否领取");
List<String> list = ListUtils.stringToList(customerCollItemsIds,"#");
if (CollectionUtils.isNotEmpty(list)){
for (String s :list){
fieldName.add(CollectItemsEnum.getCnName(Integer.valueOf(s)));
}
}
//        fieldName.add("姓名");
//        fieldName.add("电话");
//        fieldName.add("邮箱");
//        fieldName.add("地址");
//        fieldName.add("备注");
fieldName.add("参与时间");
ArrayList<ArrayList<String>> fieldData = eggService.findExportUserInfo(entId,actId,statisticsCondition,customerCollItemsIds);
ExcelFileGenerator excelFileGenerator = new ExcelFileGenerator(fieldName,fieldData);
OutputStream os = response.getOutputStream();
String filename = "砸金蛋数据统计结果（"+ com.raipeng.micro.core.utils.DateUtils.format(new Date(), com.raipeng.micro.core.utils.DateUtils.PATTERN_TIMESTAMP)+"）.xls";
//filename = new String(filename.getBytes("gbk"),"iso-8859-1");
<pre name="code" class="java">       <span style="color:#FF0000;"> filename = ExcelFileGenerator.processFileName(request,filename);</span>

/**设置response对象的设置*/ //可以不加，但是保证response缓冲区没有任何数据，开发时建议加上 response.reset(); response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-disposition", "attachment;filename="+filename); response.setBufferSize(1024); /**将生成的excel报表，写到os中*/
excelFileGenerator.expordExcel(os); return null; }

4 serviceImp查询需要显示的数据，其实看标红的就可以

@Override
@Transactional
public <span style="color:#FF0000;">ArrayList<ArrayList<String>></span> findExportUserInfo(Long entId,Long actId,StatisticsCondition statisticsCondition,String customerCollItemsIds) {
List<Object[]> objectList = wactPlayRecordDao.findStatisticsByConditionForExport(entId, actId,
statisticsCondition.getParticipateBegin(), statisticsCondition.getParticipateEnd()
, statisticsCondition.getTelephone(), statisticsCondition.getIsWin(), statisticsCondition.getIsUse());
ArrayList<ArrayList<String>> <span style="color:#FF0000;">fieldDataList </span>= new ArrayList<>();//创建保存一行数据list的list
if (objectList.size()>0){
for (Object[] obj:objectList){
ArrayList<String> <span style="color:#FF0000;">fieldData </span>= new ArrayList<>();//创建保存一行数据的list
ExportFieldsDto exportFieldsDto = new ExportFieldsDto();
Long id = new BigInteger(obj[0].toString()).longValue();
Integer isWin = new Short(obj[1].toString()).intValue();
Integer isUse = new Short(obj[2].toString()).intValue();
String openid = (String)obj[3];
String createdDateStr = com.raipeng.micro.core.utils.DateUtils.format((Date)obj[4], com.raipeng.micro.core.utils.DateUtils.PATTERN_2);
WactAwards wactAwards = new WactAwards();
Long awardsId = new BigInteger(obj[5].toString()).longValue();
if (awardsId != 0l){
wactAwards = wactAwardsDao.findAwardByAwardId(awardsId);
}
exportFieldsDto.setIsWin(isWin==0?"未中奖":"已中奖");
exportFieldsDto.setAwardsGrade(wactAwards.getGradeName()==null?"":wactAwards.getGradeName());
exportFieldsDto.setAwardsName(wactAwards.getName()==null?"":wactAwards.getName());
exportFieldsDto.setIsUse(isUse==0?"未领取":"已领取");
if (isWin==0){
exportFieldsDto.setIsUse("");
}
exportFieldsDto.setOpenid(openid);
exportFieldsDto.setCreatedDateStr(createdDateStr);
Object[] object = wactPlayRecordDao.findUserInfoByOpenId(openid);
if (object[2] != null){
exportFieldsDto.setNickName((String)object[2]);
}else if (object[4] != null){
exportFieldsDto.setNickName((String)object[4]);
}else {
exportFieldsDto.setNickName("");
}
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getNickName()==null?"":exportFieldsDto.getNickName());
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getOpenid()==null?"":exportFieldsDto.getOpenid());
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getIsWin().toString()==null?"":exportFieldsDto.getIsWin().toString());
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getAwardsName());
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getAwardsName());
<span style="color:#FF0000;">fieldData.add</span>(exportFieldsDto.getIsUse().toString()==null?"":exportFieldsDto.getIsUse().toString());//保存一行中的信息

List<String> list = ListUtils.stringToList(customerCollItemsIds, "#");
if (CollectionUtils.isNotEmpty(list)){
for (String s :list){
Object val =customerCollitemInfoDao.findValByPlayRecordIdAndCustCollItemsId(id, Long.valueOf(s));
if ("未中奖".equals(exportFieldsDto.getIsWin()) && val == null){
fieldData.add("");
}else if ("已中奖".equals(exportFieldsDto.getIsWin()) && val== null){
fieldData.add("未填写中奖信息");
}else {
fieldData.add(val.toString());
}
}
}
fieldData.add(exportFieldsDto.getCreatedDateStr()==null?"":exportFieldsDto.getCreatedDateStr());
<span style="color:#FF0000;">fieldDataList.add(fieldData);</span>//保存这一行的list
}
return <span style="color:#FF0000;">fieldDataList</span>;
}
return null;
}

5.dao使用原生的sql查询需要显示的数据