Java实现Excel导入导出数据库的方法示例

本文实例讲述了Java实现Excel导入导出数据库的方法。分享给大家供大家参考，具体如下：

由于公司需求，想通过Excel导入数据添加到数据库中，而导入的Excel的字段是不固定的，使用得通过动态创建数据表，每个Excel对应一张数据表，怎么动态创建数据表，可以参考前面一篇《java使用JDBC动态创建数据表及SQL预处理的方法》。

下面主要讲讲怎么将Excel导入到数据库中，直接上代码：干货走起~~

ExcellToObjectUtil 类

主要功能是讲Excel中的数据导入到数据库中，有几个注意点就是

1.一般Excel中第一行是字段名称，不需要导入，所以从第二行开始计算

2.每列的匹配要和对象的属性一样

import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import com.forenms.exam.domain.ExamInfo;
public class ExcellToObjectUtil {
  //examId,realName,身份证,user_card,sex,没有字段,assessment_project,admission_number,seat_number
   
  public static List readXls(POIFSFileSystem poifsFileSystem) throws IOException {
//    InputStream is = new FileInputStream(filepath);
    HSSFWorkbook hssfWorkbook = new HSSFWorkbook(poifsFileSystem);
    ExamInfo exam = null;
    List list = new ArrayList();
    // 循环工作表Sheet
    for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
      HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
      if (hssfSheet == null) {
 continue;
      }
      // 循环行Row
      for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
 HSSFRow hssfRow = hssfSheet.getRow(rowNum);
 if (hssfRow == null) {
   continue;
 }
 exam = new ExamInfo();
 // 循环列Cell
 HSSFCell examId = hssfRow.getCell(1);
 if (examId == null) {
   continue;
 }
 double id = Double.parseDouble(getValue(examId));
 exam.setExamId((int)id);
// HSSFCell realName = hssfRow.getCell(2);
// if (realName == null) {
//   continue;
// }
// exam.setRealName(getValue(realName));
// HSSFCell userCard = hssfRow.getCell(4);
// if (userCard == null) {
//   continue;
// }
// 
// exam.setUserCard(getValue(userCard));
 HSSFCell admission_number = hssfRow.getCell(8);
 if (admission_number == null) {
   continue;
 }
 exam.setAdmission_number(getValue(admission_number));
 HSSFCell seat_number = hssfRow.getCell(9);
 if (seat_number == null) {
   continue;
 }
 exam.setSeat_number(getValue(seat_number));
 list.add(exam);
      }
    }
    return list;
  }
  public static List readXlsForJS(POIFSFileSystem poifsFileSystem) throws IOException {
//   InputStream is = new FileInputStream(filepath);
   HSSFWorkbook hssfWorkbook = new HSSFWorkbook(poifsFileSystem);
   ExamInfo exam = null;
   List list = new ArrayList();
   // 循环工作表Sheet
   for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
     HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
     if (hssfSheet == null) {
continue;
     }
     // 循环行Row
     for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
HSSFRow hssfRow = hssfSheet.getRow(rowNum);
if (hssfRow == null) {
  continue;
}
exam = new ExamInfo();
// 循环列Cell 准考证号
HSSFCell admission_number = hssfRow.getCell(0);
if (admission_number == null) {
  continue;
}
exam.setAdmission_number(getValue(admission_number));
//读取身份证号
HSSFCell userCard= hssfRow.getCell(2);
if (userCard == null) {
 continue;
}
exam.setUserCard(getValue(userCard));
//读取座位号
HSSFCell seat_number = hssfRow.getCell(3);
if (seat_number == null) {
 continue;
}
exam.setSeat_number(getValue(seat_number));
//读取考场号
HSSFCell fRoomName = hssfRow.getCell(6);
if (fRoomName == null) {
 continue;
}
exam.setfRoomName(getValue(fRoomName));
//读取开考时间
HSSFCell fBeginTime = hssfRow.getCell(8);
if (fBeginTime == null) {
 continue;
}
exam.setfBeginTime(getValue(fBeginTime));
//读取结束时间
HSSFCell fEndTime = hssfRow.getCell(9);
if (fEndTime == null) {
 continue;
}
exam.setfEndTime(getValue(fEndTime));
list.add(exam);
     }
   }
   return list;
 }
  
  private static String getValue(HSSFCell hssfCell) {
    if (hssfCell.getCellType() == HSSFCell.CELL_TYPE_BOOLEAN) {
      // 返回布尔类型的值
      return String.valueOf(hssfCell.getBooleanCellValue());
    } else if (hssfCell.getCellType() == HSSFCell.CELL_TYPE_NUMERIC) {
      // 返回数值类型的值
      DecimalFormat df = new DecimalFormat("0"); 
      String strCell = df.format(hssfCell.getNumericCellValue());
      return String.valueOf(strCell);
    } else {
      // 返回字符串类型的值
      return String.valueOf(hssfCell.getStringCellValue());
    }
  }
}

当然有导入功能，一定也有导出功能，下面介绍导出功能，直接上代码：

import java.io.OutputStream;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
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.forenms.exam.domain.ExamInfo;
public class ObjectToExcellUtil {
  //导出的文件名称
  public static String FILE_NAME = "examInfo";
  public static String[] CELLS = {"序号","编号","真实姓名","证件类型","证件号","性别","出生年月","科目","准考证号","座位号","考场号","开考时间","结束时间"};
  //examId,realName,身份证,user_card,sex,没有字段,assessment_project,admission_number,seat_number
  public static void examInfoToExcel(List xls,int CountColumnNum,String filename,String[] names,HttpServletResponse response) throws Exception {
      // 获取总列数
//     int CountColumnNum = CountColumnNum;
      // 创建Excel文档
      HSSFWorkbook hwb = new HSSFWorkbook();
      ExamInfo xlsDto = null;
      // sheet 对应一个工作页
      HSSFSheet sheet = hwb.createSheet(filename);
//     sheet.setColumnHidden(1,true);//隐藏列
      HSSFRow firstrow = sheet.createRow(0); // 下标为0的行开始
      HSSFCell[] firstcell = new HSSFCell[names.length];
      for (int j = 0; j < names.length; j++) {
  sheet.setColumnWidth(j, 5000);
 firstcell[j] = firstrow.createCell(j);
 firstcell[j].setCellValue(new HSSFRichTextString(names[j]));
      }
      for (int i = 0; i < CountColumnNum; i++) {
 // 创建一行
 HSSFRow row = sheet.createRow(i + 1);
 // 得到要插入的每一条记录
 xlsDto = xls.get(i);
 for (int colu = 0; colu <= 12; colu++) {
   // 在一行内循环
   HSSFCell xh = row.createCell(0);
   xh.setCellValue(i+1);
   HSSFCell examid = row.createCell(1);
   examid.setCellValue(xlsDto.getExamId());
   HSSFCell realName = row.createCell(2);
   realName.setCellValue(xlsDto.getRealName());
   HSSFCell zjlx = row.createCell(3);
   zjlx.setCellValue("身份证");
   HSSFCell userCard = row.createCell(4);
   userCard.setCellValue(xlsDto.getUserCard());
   HSSFCell sex = row.createCell(5);
   sex.setCellValue(xlsDto.getSex());
   HSSFCell born = row.createCell(6);
   String bornTime = xlsDto.getUserCard().substring(6, 14);
   born.setCellValue(bornTime);
   HSSFCell assessment_project = row.createCell(7);
   assessment_project.setCellValue(xlsDto.getAssessmentProject());
   HSSFCell admission_number = row.createCell(8);
   admission_number.setCellValue(xlsDto.getAdmission_number());
   HSSFCell seat_number = row.createCell(9);
   seat_number.setCellValue(xlsDto.getSeat_number());
   HSSFCell fRoomName = row.createCell(10);
   fRoomName.setCellValue(xlsDto.getfRoomName());
   HSSFCell fBeginTime = row.createCell(11);
   fBeginTime.setCellValue(xlsDto.getfBeginTime());
   HSSFCell fEndTime = row.createCell(12);
   fEndTime.setCellValue(xlsDto.getfEndTime());
 }
      }
      // 创建文件输出流，准备输出电子表格
      response.reset();
      response.setContentType("application/vnd.ms-excel;charset=GBK");
      response.addHeader("Content-Disposition", "attachment;filename="+filename+".xls");
      OutputStream os = response.getOutputStream(); 
      hwb.write(os);
      os.close();
    }
}

导出的功能十分简单，只要封装好对象，直接调用方法即可，现在讲讲导入的时候前台页面怎么调用问题，

导入的前台表单提交的时候，要注意设置 enctype=”multipart/form-data” ，其他也没什么难度。
后台接受的controller：


@RequestMapping(value="adminLogin/auditResults/import",method=RequestMethod.POST)
public ModelAndView importExamInfoExcell(HttpServletRequest request,HttpServletResponse response, HttpSession session)throws Exception{
    //获取请求封装
    MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request;
    Map fileMap = multipartRequest.getFileMap();
    //读取需要填写准考证号的人员名单
    ExamInfo examInfo = new ExamInfo();
    List info = examInfoService.queryExamInfoForDownLoad(examInfo);
    //获取请求封装对象
    for(Entry entry: fileMap.entrySet()){
      MultipartFile multipartFile = entry.getValue();
      InputStream inputStream = multipartFile.getInputStream();
      POIFSFileSystem poifsFileSystem = new POIFSFileSystem(inputStream);
      //从xml读取需要的数据
      List list = ExcellToObjectUtil.readXlsForJS(poifsFileSystem);
      for (ExamInfo ei : list) {
  //通过匹配身份证号 填写对应的数据
 for (ExamInfo in : info){
   //如果身份证号 相同 则录入数据
if(in.getUserCard().trim().toUpperCase().equals(ei.getUserCard().trim().toUpperCase())){
     ei.setExamId(in.getExamId());
     examInfoService.updateExamInfoById(ei);
     break;
   }
 }
      }
    }
    ModelAndView mav=new ModelAndView(PATH+"importExcelTip");
    request.setAttribute("data", "ok");
    return mav;
}

好了，Excel导入导出的功能都搞定了，简单吧，需求自己修改一下封装的对象格式和设置Excel的每个列即可自己使用！！

更多关于java相关内容感兴趣的读者可查看本站专题：《Java操作Excel技巧总结》、《Java+MySQL数据库程序设计总结》、《Java数据结构与算法教程》、《Java文件与目录操作技巧汇总》及《Java操作DOM节点技巧总结》

希望本文所述对大家java程序设计有所帮助。

Java实现Excel导入导出数据库的方法示例

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