Question

我想开发一个代码，在其中我可以从Excel中读取数据，并使用spring mvc spring boot将数据存储在mongodb中。另外，在我的项目中，我们分离了数据库层，因此我通过URL使用了mongodb API。 Mongodb托管在AWS上。

我尝试读取excel文件，但无法将其存储在mongodb中

Answer 1

您提供的问题数据很少，这将使我们很难为您提供帮助，但这是我的尝试。...

要从excel后续代码中读取数据，需要在代码库中完成

。

在您的pom.xml文件中添加以下依赖项

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.17</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.17</version>
</dependency>

如果您使用gradle文件后紧跟build.gradle文件

compile "org.apache.poi:poi:3.17"
compile "org.apache.poi:poi-ooxml:3.17"

直接进入问题的业务部分，在课堂上写

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;

public class ExcelReader {
    public static final String SAMPLE_XLSX_FILE_PATH = "./sample-xlsx-file.xlsx";

    public static void main(String[] args) throws IOException, InvalidFormatException {

        // Creating a Workbook from an Excel file (.xls or .xlsx)
        Workbook workbook = WorkbookFactory.create(new File(SAMPLE_XLSX_FILE_PATH));

        // Retrieving the number of sheets in the Workbook
        System.out.println("Workbook has " + workbook.getNumberOfSheets() + " Sheets : ");

        /*
           =============================================================
           Iterating over all the sheets in the workbook (Multiple ways)
           =============================================================
        */

        // 1. You can obtain a sheetIterator and iterate over it
        Iterator<Sheet> sheetIterator = workbook.sheetIterator();
        System.out.println("Retrieving Sheets using Iterator");
        while (sheetIterator.hasNext()) {
            Sheet sheet = sheetIterator.next();
            System.out.println("=> " + sheet.getSheetName());
        }

        // 2. Or you can use a for-each loop
        System.out.println("Retrieving Sheets using for-each loop");
        for(Sheet sheet: workbook) {
            System.out.println("=> " + sheet.getSheetName());
        }

        // 3. Or you can use a Java 8 forEach with lambda
        System.out.println("Retrieving Sheets using Java 8 forEach with lambda");
        workbook.forEach(sheet -> {
            System.out.println("=> " + sheet.getSheetName());
        });

        /*
           ==================================================================
           Iterating over all the rows and columns in a Sheet (Multiple ways)
           ==================================================================
        */

        // Getting the Sheet at index zero
        Sheet sheet = workbook.getSheetAt(0);

        // Create a DataFormatter to format and get each cell's value as String
        DataFormatter dataFormatter = new DataFormatter();

        // 1. You can obtain a rowIterator and columnIterator and iterate over them
        System.out.println("\n\nIterating over Rows and Columns using Iterator\n");
        Iterator<Row> rowIterator = sheet.rowIterator();
        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();

            // Now let's iterate over the columns of the current row
            Iterator<Cell> cellIterator = row.cellIterator();

            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();
                String cellValue = dataFormatter.formatCellValue(cell);
                System.out.print(cellValue + "\t");
            }
            System.out.println();
        }

        // 2. Or you can use a for-each loop to iterate over the rows and columns
        System.out.println("\n\nIterating over Rows and Columns using for-each loop\n");
        for (Row row: sheet) {
            for(Cell cell: row) {
                String cellValue = dataFormatter.formatCellValue(cell);
                System.out.print(cellValue + "\t");
            }
            System.out.println();
        }

        // 3. Or you can use Java 8 forEach loop with lambda
        System.out.println("\n\nIterating over Rows and Columns using Java 8 forEach with lambda\n");
        sheet.forEach(row -> {
            row.forEach(cell -> {
                String cellValue = dataFormatter.formatCellValue(cell);
                System.out.print(cellValue + "\t");
            });
            System.out.println();
        });

        // Closing the workbook
        workbook.close();
    }
}

通过CellType检索单元格值

private static void printCellValue(Cell cell) {
    switch (cell.getCellTypeEnum()) {
        case BOOLEAN:
            System.out.print(cell.getBooleanCellValue());
            break;
        case STRING:
            System.out.print(cell.getRichStringCellValue().getString());
            break;
        case NUMERIC:
            if (DateUtil.isCellDateFormatted(cell)) {
                System.out.print(cell.getDateCellValue());
            } else {
                System.out.print(cell.getNumericCellValue());
            }
            break;
        case FORMULA:
            System.out.print(cell.getCellFormula());
            break;
        case BLANK:
            System.out.print("");
            break;
        default:
            System.out.print("");
    }

    System.out.print("\t");
}

像这样简单地打电话

sheet.forEach(row -> {
    row.forEach(cell -> {
        printCellValue(cell);
    });
    System.out.println();
});

要帮助我们将其添加到mongoDB中，您必须向我们提供更多信息。如果您需要上述代码中的任何帮助，请发表评论。

如何使用Spring Boot从Excel读取数据并将其存储在mongodb中

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