Springboot整合poi实现Excel导入导出到数据库
引入依赖
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-scratchpad -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>3.8</version>
</dependency>
Excel导入数据并解析到数据库
- controller层
@ApiOperation("导入execl")
@PostMapping("/UploadExcel")
public ResponseWrapper ajaxUploadExcel(@RequestParam(value="excelFile",required = false) MultipartFile excelFile) throws ParseException {
ResponseWrapper wrapper = recordService.UploadExcel(excelFile);
return wrapper;
}
- service层
public ResponseWrapper UploadExcel(MultipartFile file) throws ParseException {
if (file.isEmpty()) {
try {
throw new Exception("文件不存在！");
} catch (Exception e) {
e.printStackTrace();
}
}
InputStream in = null;
try {
in = file.getInputStream();
} catch (IOException e) {
e.printStackTrace();
}
List<List<Object>> listob = null;
try {
listob = new ExcelUtils().getBankListByExcel(in,file.getOriginalFilename());
// System.out.println("listob触发了"+listob);
} catch (Exception e) {
e.printStackTrace();
}
//该处可调用service相应方法进行数据保存到数据库中，现只对数据输出
for (int i = 0; i < listob.size(); i++) {
List<Object> lo = listob.get(i);
Record vo = new Record();
Record j = null;
//这里是主键验证，根据实际需要添加，可要可不要，加上之后，可以对现有数据进行批量修改和导入
try {
j = recordMapper.selectByPrimaryKey(Integer.valueOf(String.valueOf(lo.get(0))));
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
}
if (j == null) {
// 假如id为空则表示没有这条数据，创建这条数据
vo.setId(Integer.valueOf(String.valueOf(lo.get(0))));
vo.setContent(String.valueOf(lo.get(1)));
vo.setNumber(String.valueOf(lo.get(2)));
vo.setDeadline(String.valueOf(lo.get(3)));
vo.setCompany(String.valueOf(lo.get(4)));
vo.setWeeks(String.valueOf(lo.get(5)));
addRecord(vo);
} else {
// 如果这条数据存在则调用修改方法，修改这条数据
vo.setId(Integer.valueOf(String.valueOf(lo.get(0))));
vo.setContent(String.valueOf(lo.get(1)));
vo.setNumber(String.valueOf(lo.get(2)));
vo.setDeadline(String.valueOf(lo.get(3)));
vo.setCompany(String.valueOf(lo.get(4)));
vo.setWeeks(String.valueOf(lo.get(5)));
updateRecord(vo);
}
}
return ResponseWrapper.markSuccess(null);
}
数据将数据库的数据导出到excel
- contoller层
@ApiOperation("导出excel")
@GetMapping("/excel")
public void excel( HttpServletResponse response)throws IOException {
recordService.excel(response);
return;
}
- service层
public void excel(HttpServletResponse response)throws IOException{
//确定编码的格式
response.setCharacterEncoding("UTF-8");
//获取导出的数据
List<Admin> list = adminMapper.findAllAdmin();
//创建excel文件
XSSFWorkbook wb = new XSSFWorkbook();
//创建sheet页
XSSFSheet sheet = wb.createSheet("学生信息表");
//创建标题行
XSSFRow titleRow = sheet.createRow(0);
titleRow.createCell(0).setCellValue("ID");
titleRow.createCell(1).setCellValue("姓名");
titleRow.createCell(2).setCellValue("密码");
titleRow.createCell(3).setCellValue("角色");
titleRow.createCell(4).setCellValue("时间");
//遍历将数据放到excel列中
for (Admin student : list) {
XSSFRow dataRow = sheet.createRow(sheet.getLastRowNum()+1);
dataRow.createCell(0).setCellValue(student.getAid());
dataRow.createCell(1).setCellValue(student.getUsername());
dataRow.createCell(2).setCellValue(student.getPassword());
dataRow.createCell(3).setCellValue(student.getSrole());
//由于时间数据库格式是date，所以要将时间格式进行转换
SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
String time = format.format(student.getTime());
dataRow.createCell(4).setCellValue(time);
// 设置下载时客户端Excel的名称 （上面注释的改进版本，上面的中文不支持）
response.setContentType("application/octet-stream;charset=utf-8");
response.setHeader("Content-Disposition", "attachment;filename="
//该版本为2007-的版本
+ new String("名单".getBytes("UTF-8"),"iso-8859-1")
+ ".xlsx");
OutputStream ouputStream = response.getOutputStream();
wb.write(ouputStream);
ouputStream.flush();
ouputStream.close();
}
工具类（导入导出都要调用）
package com.zgqk.method;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.InputStream;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Excel工具类
*/
public class ExcelUtils {
private final static String excel2003L =".xls"; //2003- 版本的excel
private final static String excel2007U =".xlsx"; //2007+ 版本的excel
/**
* 描述：获取IO流中的数据，组装成List<List<Object>>对象
* @param in,fileName
* @return
* @throws
*/
public List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
List<List<Object>> list = null;
//创建Excel工作薄
Workbook work = this.getWorkbook(in,fileName);
if(null == work){
throw new Exception("创建Excel工作薄为空！");
}
Sheet sheet = null; //页数
Row row = null; //行数
Cell cell = null; //列数
list = new ArrayList<List<Object>>();
//遍历Excel中所有的sheet
for (int i = 0; i < work.getNumberOfSheets(); i++) {
sheet = work.getSheetAt(i);
if(sheet==null){continue;}
//遍历当前sheet中的所有行
for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
row = sheet.getRow(j);
if(row==null||row.getFirstCellNum()==j){continue;}
//遍历所有的列
List<Object> li = new ArrayList<Object>();
for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
cell = row.getCell(y);
li.add(this.getValue(cell));
}
list.add(li);
}
}
return list;
}
/**
* 描述：根据文件后缀，自适应上传文件的版本
* @param inStr,fileName
* @return
* @throws Exception
*/
public Workbook getWorkbook(InputStream inStr, String fileName) throws Exception{
Workbook wb = null;
String fileType = fileName.substring(fileName.lastIndexOf("."));
if(excel2003L.equals(fileType)){
wb = new HSSFWorkbook(inStr); //2003-
}else if(excel2007U.equals(fileType)){
//2003版运用HSS协议，2007运用XSS协议
wb = new XSSFWorkbook(inStr); //2007+
}else{
throw new Exception("解析的文件格式有误！");
}
return wb;
}
/**
* 描述：对表格中数值进行格式化
* @param cell
* @return
*/
//解决excel类型问题，获得数值
public String getValue(Cell cell) {
String value = "";
if(null==cell){
return value;
}
//poi.jar高版本中其中的常量的名称会改变
switch (cell.getCellType()) {
//数值型
case Cell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
//如果是date类型则 ，获取该cell的date值
Date date = HSSFDateUtil.getJavaDate(cell.getNumericCellValue());
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
value = format.format(date);
}else {// 纯数字
BigDecimal big=new BigDecimal(cell.getNumericCellValue());
value = big.toString();
//解决1234.0 去掉后面的.0
if(null!=value&&!"".equals(value.trim())){
String[] item = value.split("[.]");
if(1<item.length&&"0".equals(item[1])){
value=item[0];
}
}
}
break;
//字符串类型
case Cell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
// 公式类型
case Cell.CELL_TYPE_FORMULA:
//读公式计算值
value = String.valueOf(cell.getNumericCellValue());
if (value.equals("NaN")) {// 如果获取的数据值为非法值,则转换为获取字符串
value = cell.getStringCellValue();
}
break;
// 布尔类型
case Cell.CELL_TYPE_BOOLEAN:
value = " "+ cell.getBooleanCellValue();
break;
default:
value = cell.getStringCellValue();
}
if("null".endsWith(value.trim())){
value="";
}
return value;
}
}