<!--数据导出依赖 excel-->
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>3.17</version>
</dependency>

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;/*** @desc:数据导出，生成excel文件时的列名称集合* @author: chao* @time: 2018.6.11*/
public class ColumnTitleMap {private Map<String, String> columnTitleMap = new HashMap<String, String>();private ArrayList<String> titleKeyList = new ArrayList<String> ();public ColumnTitleMap(String datatype) {switch (datatype) {case "passenger":initPassengerColu();initPassengerTitleKeyList();break;default:break;}}/*** mysql用户表需要导出字段--显示名称对应集合*/private void initPassengerColu() {columnTitleMap.put("idCard", "身份证号");columnTitleMap.put("passName", "乘客姓名");columnTitleMap.put("sex", "性别");columnTitleMap.put("birdate", "出生日期");columnTitleMap.put("phone", "手机号");columnTitleMap.put("birthplace", "出生地户籍");columnTitleMap.put("residence", "现住址");columnTitleMap.put("source", "注册来源");}/*** mysql用户表需要导出字段集*/private void initPassengerTitleKeyList() {titleKeyList.add("idCard");titleKeyList.add("passName");titleKeyList.add("sex");titleKeyList.add("birdate");titleKeyList.add("phone");titleKeyList.add("birthplace");titleKeyList.add("residence");titleKeyList.add("source");}public Map<String, String> getColumnTitleMap() {return columnTitleMap;}public ArrayList<String> getTitleKeyList() {return titleKeyList;}
}

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;public class ObjToMapUtil {/*** 对象转map* @param obj* @return*/public Map<String, Object> objToMap(Object obj) {Map<String, Object> map = new HashMap<String, Object>();Field[] fields = obj.getClass().getDeclaredFields();   // 获取f对象对应类中的所有属性域for (int i = 0, len = fields.length; i < len; i++) {String varName = fields[i].getName();varName = varName.toLowerCase();               // 将key置为小写，默认为对象的属性try {boolean accessFlag = fields[i].isAccessible(); // 获取原来的访问控制权限fields[i].setAccessible(true);             // 修改访问控制权限Object o = fields[i].get(obj);             // 获取在对象f中属性fields[i]对应的对象中的变量if (o != null){map.put(varName, o.toString());}fields[i].setAccessible(accessFlag);         // 恢复访问控制权限} catch (IllegalArgumentException ex) {ex.printStackTrace();} catch (IllegalAccessException ex) {ex.printStackTrace();}}return map;}}

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;/*** @desc:数据导出，生成excel文件* @author: chao* @time: 2018.6.12*/
@Service
public class ExportExcelUtil {public OutputStream expoerDataExcel(HttpServletResponse response, ArrayList<String> titleKeyList, Map<String, String> titleMap, List<Map<String,Object>> src_list) throws IOException {String xlsFile_name = System.currentTimeMillis() + ".xlsx";     //输出xls文件名称//内存中只创建100个对象Workbook wb = new SXSSFWorkbook(100);           //关键语句Sheet sheet = null;     //工作表对象Row nRow = null;        //行对象Cell nCell = null;      //列对象int rowNo = 0;      //总行号int pageRowNo = 0;  //页行号for (int k=0;k<src_list.size();k++) {Map<String,Object> srcMap = src_list.get(k);//写入300000条后切换到下个工作表if(rowNo%300000==0){wb.createSheet("工作簿"+(rowNo/300000));//创建新的sheet对象sheet = wb.getSheetAt(rowNo/300000);        //动态指定当前的工作表pageRowNo = 0;      //新建了工作表,重置工作表的行号为0// -----------定义表头-----------nRow = sheet.createRow(pageRowNo++);// 列数 titleKeyList.size()for(int i=0;i<titleKeyList.size();i++){Cell cell_tem = nRow.createCell(i);cell_tem.setCellValue(titleMap.get(titleKeyList.get(i)));}rowNo++;// ---------------------------}rowNo++;nRow = sheet.createRow(pageRowNo++);    //新建行对象// 行，获取cell值for(int j=0;j<titleKeyList.size();j++){nCell = nRow.createCell(j);if (srcMap.get(titleKeyList.get(j)) != null) {if("taxidriver".equals(titleKeyList.get(j))){if("0".equals(srcMap.get(titleKeyList.get(j)).toString())){nCell.setCellValue("否");}else if("1".equals(srcMap.get(titleKeyList.get(j)).toString())){nCell.setCellValue("是");}}else if("drivergender".equals(titleKeyList.get(j))){if("1".equals(srcMap.get(titleKeyList.get(j)).toString())){nCell.setCellValue("男");}else if("2".equals(srcMap.get(titleKeyList.get(j)).toString())){nCell.setCellValue("女");}else if("9".equals(srcMap.get(titleKeyList.get(j)).toString())){nCell.setCellValue("未知");}}else {nCell.setCellValue(srcMap.get(titleKeyList.get(j)).toString());}} else {nCell.setCellValue("");}}}response.setContentType("application/vnd.ms-excel;charset=utf-8");response.setHeader("Content-disposition", "attachment;filename=" + xlsFile_name);response.flushBuffer();OutputStream outputStream = response.getOutputStream();wb.write(response.getOutputStream());wb.close();outputStream.flush();outputStream.close();return  outputStream;}
}

@PostMapping("/passenger/excel/download")
public Result exportPassengerData(String phone,String start,String end,String source,String state,HttpServletResponse response){try {Map<String,Object> map = new HashMap<>();
//查询需要导出的数据List<Passenger> passengerList = passengerService.getDao().getPassengerByCondition(phone,start,end,source,state);List<Map<String,Object>> list = new ArrayList<>();
//把对象转mappassengerList.forEach(passenger -> {Map<String, Object> item = new ObjToMapUtil().objToMap(passenger);list.add(item);});ArrayList<String> titleKeyList= new ColumnTitleMap("passenger").getTitleKeyList();Map<String, String> titleMap = new ColumnTitleMap("passenger").getColumnTitleMap();
//导出数据到excelOutputStream outputStream = new ExportExcelUtil().expoerDataExcel(response, titleKeyList, titleMap, list);map.put("data",outputStream);return Result.ok(map);}catch (Exception e){e.printStackTrace();return Result.fail(901,"导出乘客信息失败！");}
}