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There are several steps to creating a JUnit 5 Testing Service that can access and read an Excel file:

1. Add the Apache POI dependency to your project. Apache POI is a Java library for working with Microsoft Office documents like Excel files. You can add the following dependency to your Maven project:

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>

1. Create a test class that extends the JUnit 5 TestWatcher class. The TestWatcher class provides hooks for executing code before and after each test method.

public class ExcelReaderTest extends TestWatcher {
    // code goes here
}

1. Define a Workbook instance variable that will hold the Excel file contents.

public class ExcelReaderTest extends TestWatcher {
    private Workbook workbook;
}

1. Override the starting(ExtensionContext) method of the TestWatcher class to load the Excel file and save its contents to the workbook variable. You'll need to specify the path to the Excel file in your project, using a java.io.File object.

@Override
protected void starting(ExtensionContext context) throws IOException {
    File excelFile = new File("path/to/excel/file.xlsx");
    FileInputStream inputStream = new FileInputStream(excelFile);

    workbook = new XSSFWorkbook(inputStream);
}

1. Create test methods that use the workbook variable to read data from the Excel file. You can use the Workbook API to access sheets, rows, and cells in the Excel file, and read their values.

@Test
void testReadCellValue() {
    Sheet sheet = workbook.getSheetAt(0);
    Row row = sheet.getRow(0);
    Cell cell = row.getCell(0);

    assertEquals("Hello, world!", cell.getStringCellValue());
}

1. Optionally, override the finished(ExtensionContext) method to close any resources that were opened in the starting(ExtensionContext) method.

@Override
protected void finished(ExtensionContext context) {
    try {
        if (workbook != null) {
            workbook.close();
        }
    } catch (IOException e) {
        // handle the exception
    }
}

That's it! You should now have a JUnit 5 Testing Service that can access and read an Excel file.