@Override
    public void execute() {
        CSVParser csvParser;
        try {
            // Create a CSV parser instance
            csvParser = csvParser();
            // Store the CSV parser instance in the context for subsequent processing
            csvReadContext.csvReadWorkbookHolder().setCsvParser(csvParser);
        } catch (IOException e) {
            throw new ExcelAnalysisException(e);
        }
        // Iterate through each sheet in the sheet list
        for (ReadSheet readSheet : sheetList) {
            // Match and update the readSheet object
            readSheet = SheetUtils.match(readSheet, csvReadContext);
            // If the match result is null, skip the current sheet
            if (readSheet == null) {
                continue;
            }
            try {
                // Set the current sheet being processed in the context
                csvReadContext.currentSheet(readSheet);

                // Initialize the row index
                int rowIndex = 0;

                for (CSVRecord record : csvParser) {
                    // Process the current record, incrementing the row index after each processing
                    dealRecord(record, rowIndex++);
                }
            } catch (ExcelAnalysisStopSheetException e) {
                if (log.isDebugEnabled()) {
                    log.debug("Custom stop!", e);
                }
            }

            // The last sheet is read
            csvReadContext.analysisEventProcessor().endSheet(csvReadContext);
        }
    }
Overrides the execute method to parse and process CSV files.
This method first attempts to create a CSV parser, then iterates through each sheet,
and processes each record in the CSV file.
fastexcel-core/src/main/java/cn/idev/excel/analysis/csv/CsvExcelReadExecutor.java