Poi实现Excle表导入与导出

一、引入maven依赖

  <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.7.RELEASE</version>
        </dependency>

二、编写Poi工具类

/**
 * @author sunyiran
 * @date 2018-07-25
 * @purpose excel表解析工具
 */
public class PoiUtil {

	private static final  String EXCLE_2003 = "xls";
	private static final  String EXCLE_2007 = "xlsx";

	/**
	 * single newInstance
	 */
	private PoiUtil() {

	}

	/**
	 * 获取Excle
	 * @param file
	 * @return
	 */
	public static Sheet getSheet(MultipartFile file) {
		String fileFileName = file.getOriginalFilename();
		if (fileFileName.endsWith(EXCLE_2003)) {
			HSSFWorkbook hssf = null;
			try {
				hssf = new HSSFWorkbook(file.getInputStream());
			} catch (IOException e) {

				e.printStackTrace();
			}
			HSSFSheet sheet = hssf.getSheetAt(0);
			return sheet;
		}
		if (fileFileName.endsWith(EXCLE_2007)) {
			XSSFWorkbook wssf = null;
			try {
				wssf = new XSSFWorkbook(file.getInputStream());
			} catch (IOException e) {

				e.printStackTrace();
			}
			XSSFSheet sheet = wssf.getSheetAt(0);
			return sheet;
		}
		return null;
	}

	/**
	 * 导出Excel  (表格默认宽度20*256)
	 * @param sheetName sheet名称
	 * @param title 标题
	 * @param values 内容
	 * @param wb HSSFWorkbook对象
	 * @return
	 */
	public static XSSFWorkbook getXSSFWorkbook(String sheetName,String []title,String [][]values, XSSFWorkbook wb){

		// 第一步，创建一个HSSFWorkbook，对应一个Excel文件
		if(wb == null){
			wb = new XSSFWorkbook();
		}

		// 第二步，在workbook中添加一个sheet,对应Excel文件中的sheet
		XSSFSheet sheet = wb.createSheet(sheetName);

		for (int i = 0; i < title.length; i++) {
			sheet.setColumnWidth(i, 20 * 256);
		}

		// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
		XSSFRow row = sheet.createRow(0);

		// 第四步，创建单元格，并设置值表头 设置表头居中
		XSSFCellStyle style = wb.createCellStyle();
		// 创建一个居中格式
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

		//声明列对象
		XSSFCell cell = null;

		//创建标题
		for(int i=0;i<title.length;i++){
			cell = row.createCell(i);
			cell.setCellValue(title[i]);
			cell.setCellStyle(style);
		}

		//创建内容
		for(int i=0;i<values.length;i++){
			row = sheet.createRow(i + 1);
			for(int j=0;j<values[i].length;j++){
				//将内容按顺序赋给对应的列对象
				row.createCell(j).setCellValue(values[i][j]);
			}
		}
		return wb;
	}
}

三、编写业务代码

 @Transactional
    @Override
    public void importExcle(MultipartFile file, String handler) {
        Sheet sheet = PoiUtil.getSheet(file);

        Assert.notNull(sheet, "Excle表不正确");
  //根据model对象实际内容进行解析
        for (Row row : sheet) {
            // 跳过第一行
            if (row.getRowNum() == 0) {
                continue;
            }
            // 跳过空白位置
            if (row.getCell(0) == null || StringUtils.isBlank(row.getCell(0).getStringCellValue())) {
                continue;
            }
            //开始创建对象,为确保参数验证，先用createBean对象
            CommunityCreateBean createBean = new CommunityCreateBean();
            createBean.setCommunityName(row.getCell(0).getStringCellValue());
            createBean.setProvince(row.getCell(1).getStringCellValue());
            createBean.setCity(row.getCell(2).getStringCellValue());
            createBean.setPropertyName(row.getCell(3).getStringCellValue());
            //特别注意电话号码，在poi解析中只有字符串和浮点类型
            BigDecimal phone = new BigDecimal(row.getCell(4).getNumericCellValue());
            createBean.setPhone(phone.toString());
            createBean.setCreator(handler);
            createBean.setCreateTime(new Date());
            createBean.setOnOff(CommunityStatus.UNSTART.getStatus());

            CwCommunity exitCommunity = communityRepository.findByCommunityNameAndProvinceAndCity(createBean.getCommunityName(), createBean
                    .getProvince(), createBean.getCity());
            if (exitCommunity != null) {
                throw new RuntimeException("该小区已经存在");
            }
            CwCommunity community = new CwCommunity();
            BeanUtils.copyProperties(createBean, community);
            communityRepository.save(community);
        }
    }

    @Transactional
    @Override
    public XSSFWorkbook exportExcle() {
        String name = "小区信息表";
        String[] title = {"小区名称", "所在省", "所在市", "物业名称", "物业电话"};
        List<CwCommunity> list = communityRepository.findAll();
        String[][] content = new String[list.size()][title.length];
        for (int i = 0; i < list.size(); i++) {
            CwCommunity community = list.get(i);
            content[i][0] = community.getCommunityName();
            content[i][1] = community.getProvince();
            content[i][2] = community.getCity();
            content[i][3] = community.getPropertyName();
            content[i][4] = community.getPhone();
        }
        XSSFWorkbook workbook = PoiUtil.getXSSFWorkbook(name, title, content, null);
        return workbook;
    }

四、测试

        列表为空，现在点击导入小区信息

然后选择导出小区信息

结果OK