如何使用spring boot讀取excel文件

Question

我正在制作一個 Spring Boot 應用程序，它將獲取 excel 文件並存儲其內容並將其存儲在數據庫中。 我嘗試了很多方法..但沒有成功。 有沒有人知道如何做到這一點。 我不知道如何制作用於導入excel文件的控制器。 是否有任何依賴項我必須包括從 excel 文件中讀取數據

Answer 1

終於找到了解決辦法。

用於上傳表單的 HTML 文件是

<form th:action="@{/import}" method="post" enctype="multipart/form-data">
    <input type="file" th:name="file" />
    <input th:type="submit" value="Import" />
</form>

控制器類是

@PostMapping("/import")
public void mapReapExcelDatatoDB(@RequestParam("file") MultipartFile reapExcelDataFile) throws IOException {
    
    List<Test> tempStudentList = new ArrayList<Test>();
    XSSFWorkbook workbook = new XSSFWorkbook(reapExcelDataFile.getInputStream());
    XSSFSheet worksheet = workbook.getSheetAt(0);
    
    for(int i=1;i<worksheet.getPhysicalNumberOfRows() ;i++) {
        Test tempStudent = new Test();
            
        XSSFRow row = worksheet.getRow(i);
            
        tempStudent.setId((int) row.getCell(0).getNumericCellValue());
        tempStudent.setContent(row.getCell(1).getStringCellValue());
        tempStudentList.add(tempStudent);   
    }
}

確保添加依賴項

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.12</version>
</dependency>
<!-- excel 2007 over-->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.12</version>
</dependency>

現在它會正常工作。

Answer 2

使用 Apache POI 庫，該庫可通過 Maven 依賴項輕松獲得。

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
  </dependency>

讀取文件的代碼

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;

public class ApachePOIExcelRead {

    private static final String FILE_NAME = "/tmp/MyFirstExcel.xlsx";

    public static void main(String[] args) {

        try {

            FileInputStream excelFile = new FileInputStream(new File(FILE_NAME));
            Workbook workbook = new XSSFWorkbook(excelFile);
            Sheet datatypeSheet = workbook.getSheetAt(0);
            Iterator<Row> iterator = datatypeSheet.iterator();

            while (iterator.hasNext()) {

                Row currentRow = iterator.next();
                Iterator<Cell> cellIterator = currentRow.iterator();

                while (cellIterator.hasNext()) {

                    Cell currentCell = cellIterator.next();
                    //getCellTypeEnum shown as deprecated for version 3.15
                    //getCellTypeEnum ill be renamed to getCellType starting from version 4.0
                    if (currentCell.getCellTypeEnum() == CellType.STRING) {
                        System.out.print(currentCell.getStringCellValue() + "--");
                    } else if (currentCell.getCellTypeEnum() == CellType.NUMERIC) {
                        System.out.print(currentCell.getNumericCellValue() + "--");
                    }

                }
                System.out.println();

            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

請根據您的要求修改上述程序。 如果你知道你的 excel 文件列索引，那么你可以直接行讀取單元格，例如row.getCell(0) where row object like XSSFRow row = (XSSFRow) iterator.next();

希望這會幫助你

參考

Answer 3

為我工作

    <form th:action="@{/import}" method="post" enctype="multipart/form-data">

        <input type="file" th:name="file">

    <input th:type="submit" value="Import" />

    @PostMapping("/import")
    public void mapReapExcelDatatoDB(@RequestParam("file") MultipartFile reapExcelDataFile) throws IOException {

       List<Test> tempStudentList = new ArrayList<Test>();
        XSSFWorkbook workbook = new XSSFWorkbook(reapExcelDataFile.getInputStream());
        XSSFSheet worksheet = workbook.getSheetAt(0);

        for(int i=1;i<worksheet.getPhysicalNumberOfRows() ;i++) {
            Test tempStudent = new Test();

            XSSFRow row = worksheet.getRow(i);

            tempStudent.setId((int) row.getCell(0).getNumericCellValue());
            tempStudent.setContent(row.getCell(1).getStringCellValue());
                tempStudentList.add(tempStudent);   
        }
    }

Answer 4

添加此依賴項也很好：

<dependency>
        <groupId>org.apache.xmlbeans</groupId>
        <artifactId>xmlbeans</artifactId>
        <version>3.1.0</version>
</dependency>