spring boot read Excel

First introduced its dependencies

 <-! Parsing office documents ->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
 <-! Parsing office documents ->

Tools

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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

public class OfficeUtils {

    protected static final Logger logger = LoggerFactory.getLogger(OfficeUtils.class);

    the Map static public <Integer, the Map <Integer, Object >> readExcelContentz (a MultipartFile File) throws Exception { 
        the Map <Integer, the Map <Integer, Object Content >> new new = the HashMap <Integer, the Map <Integer, Object >> (); 
        / / upload filename 
        the Workbook getWb WB = (file); 
        IF (WB == null) { 
            the throw new new BusinessException (ErrorType.WORK_BOOK_EMPTY); 
        } 
        Sheet Sheet wb.getSheetAt = (0); 
        // get the number of rows 
        int rowNum = sheet. getLastRowNum (); 
        row row = sheet.getRow (0); 
        int colNum row.getPhysicalNumberOfCells = (); 
        // body content should start from the second row, the first row header heading 
        for (int i = 1; i < rowNum =; I ++) { 
            Row = sheet.getRow (I);
            int j = 0;
            Map<Integer, Object> cellValue = new HashMap<Integer, Object>();
            while (j < colNum) {
                Object obj = getCellFormatValue(row.getCell(j));
                cellValue.put(j, obj);
                j++;
            }
            content.put(i, cellValue);

        }
        return content;
    }

    //根据Cell类型设置数据
    private static Object getCellFormatValue(Cell cell) {
        Object cellvalue = "";
        if (cell != null) {
            switch (cell.getCellTypeEnum()) {
                case NUMERIC:
                    cellvalue = String.valueOf(cell.getNumericCellValue());
                    break;
                case FORMULA: {
                    cellvalue = cell.getDateCellValue();
                    break;
                }
                case STRING:
                    cellvalue = cell.getRichStringCellValue().getString();
                    break;
                default:
                    cellvalue = "";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;
    }

    private static Workbook getWb(MultipartFile mf) {
        String filepath = mf.getOriginalFilename();
        String ext = filepath.substring(filepath.lastIndexOf("."));
        Workbook wb = null;
        try {
            InputStream is = mf.getInputStream();
            if (".xls".equals(ext)) {
                wb = new HSSFWorkbook(is);
            } else if (".xlsx".equals(ext)) {
                wb = new XSSFWorkbook(is);
            } else {
                wb = null;
            }
        } catch (FileNotFoundException e) {
            logger.error("FileNotFoundException", e);
        } catch (IOException e) {
            logger.error("IOException", e);
        }
        return wb;
    }
}

service layer

public Map<Integer, Map<Integer,Object>> addCustomerInfo(MultipartFile file) {
    Map<Integer, Map<Integer,Object>> map = new HashMap<>();
    try {
        map = ReadExcelUtil.readExcelContentz(file);
    } catch (Exception e) {
        e.printStackTrace ();
    }
    // excel in the map data is present, map.get (0) .get (0 ) is the value of the first row of the first column excel, where the data can be processed 
}

controller layer

@PostMapping
public String add(@RequestParam("file")MultipartFile file){
    Map<Integer, Map<Integer,Object>> map = customerService.addCustomerInfo(file);
    return "success";
}

Thus, the basic completion of parsing of Excel.