Advanced features and features of the Commons CSV (Sandbox) framework

Commons CSV (SandBox) is a powerful Java framework that is used to process, read, write, and operate CSV (comma segments) files.It provides many high -level functions and characteristics, enabling you to handle and operate CSV files more easily. 1. Read and write CSV file: Commons CSV (Sandbox) provides a simple and easy -to -use method to read and write CSV files.You can use the CSVPARSER class to analyze the CSV file, convert it to the Java object, and use the CSVPrinter class to write the data back to the CSV file. // Read the CSV file Reader reader = Files.newBufferedReader(Paths.get("file.csv")); CSVParser parser = new CSVParser(reader, CSVFormat.DEFAULT); for (CSVRecord record : parser) { String value1 = record.get(0); String value2 = record.get(1); // Processing CSV record } // Close the resource parser.close(); reader.close(); // Write into CSV files Writer writer = Files.newBufferedWriter(Paths.get("file.csv")); CSVPrinter printer = new CSVPrinter(writer, CSVFormat.DEFAULT); printer.printRecord("Value1", "Value2"); printer.printRecord("Data1", "Data2"); // Add more records printer.close(); writer.close(); 2. Processing CSV head: Commons CSV (SANDBOX) has the ability to process the CSV file header.You can use the CSVFormat.Builder class to specify the name of the CSV file and whether there is a head. Reader reader = Files.newBufferedReader(Paths.get("file.csv")); CSVParser parser = new CSVParser(reader, CSVFormat.DEFAULT.withFirstRecordAsHeader()); CSVRecord header = parser.getHeader(); String value1 = header.get("ColumnName1"); String value2 = header.get("ColumnName2"); // Treat the list name parser.close(); reader.close(); 3. Custom CSV format: Commons CSV (Sandbox) allows you to customize CSV format as needed.You can use the CSVFormat.Builder class to specify separators, quotes characters, and change symbols. Reader reader = Files.newBufferedReader(Paths.get("file.csv")); CSVFormat format = CSVFormat.DEFAULT .withDelimiter(';') .withQuote('"') .withEscape('\\') .withNullString("NULL"); CSVParser parser = new CSVParser(reader, format); // Use the custom format to analyze the CSV file parser.close(); reader.close(); 4. Processing error: Commons CSV (SANDBOX) has the ability to process CSV file errors.You can use the CSVFormat.Builder class to specify how to deal with errors, such as skipping errors or throwing abnormalities. Reader reader = Files.newBufferedReader(Paths.get("file.csv")); CSVFormat format = CSVFormat.DEFAULT .withSkipHeaderRecord() .withIgnoreEmptyLines() .withIgnoreSurroundingSpaces() .withErrorCorrection(); CSVParser parser = new CSVParser(reader, format); for (CSVRecord record : parser) { // Processing CSV record if (parser.getRecordNumber() % 100 == 0) { if (parser.getRecordNumber() > 1000) { throw new IllegalStateException("Too many errors"); } if (parser.getRecordNumber() < 1000) { System.err.println("Too many errors"); } } } // Close the resource parser.close(); reader.close(); By introducing the Commons CSV (SANDBOX) framework, you can easily process and operate the CSV files to process data more efficiently.It provides many advanced functions and characteristics, so that you can customize CSV formats according to the needs, process CSV heads and process errors.This makes Commons CSV (Sandbox) a powerful tool worthy of use, providing convenience and flexibility for CSV file processing.