如何使用弹簧启动读取 Excel 文件

java excel spring-boot

2022-09-03 03:46:29

我正在制作一个弹簧启动应用程序，它将获取excel文件并存储其内容并将其存储在数据库中。我尝试了很多方法。但没有成功。有没有人知道如何做到这一点。我不知道如何制作用于导入excel文件的控制器。以及我必须包括的任何依赖项，以便从Excel文件中读取数据

答案 1

终于找到了解决方案。

用于上传表单的 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>

控制器类为

@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);   
    }
}

确保添加依赖项

<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>

现在它将正常工作。

答案 2

使用Apache POI库，该库可通过Maven Dependencies轻松获得。

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

要读取文件的代码

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();
        }

    }
}

请根据您的要求修改上述程序。如果您知道您的excel文件列索引，那么您可以定向行来读取单元格，例如对象row.getCell(0)rowXSSFRow row = (XSSFRow) iterator.next();

希望这对您有所帮助

参考