How to use the Commons CSV (SANDBOX) framework in the Java library

How to use the Commons CSV (SANDBOX) framework in the Java library Overview: Commons CSV is an open source Java class library that is used to handle the input and output of the CSV (comma division value) file format.In this article, we will introduce how to use the Commons CSV (Sandbox) framework in the Java class library and provide the corresponding Java code example. Step 1: Import the Commons CSV library First, we need to import the Commons CSV library in the project.It can be achieved by adding related dependencies in the construction document of the project.For example, in the Maven project, you can add the following code to the pom.xml file: <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-csv</artifactId> <version>1.8-SNAPSHOT</version> </dependency> Step 2: Create CSVPARSER and CSVPrinter object Before using Commons CSV, we need to create CSVPARSER and CSVPrinter objects.CSVPARSER is used to analyze CSV files, while CSVPrinter is used to write data into CSV files. The following is a sample code for creating a CSVPARSER object: Reader Reader = New FILEREADER ("Data.csv"); // Specify the CSV file path CSVParser parser = new CSVParser(reader, CSVFormat.DEFAULT); The following is a sample code for creating a CSVPrinter object: Writer writer = new filewriter ("output.csv"); // Specify the CSV file path to be output CSVPrinter printer = new CSVPrinter(writer, CSVFormat.DEFAULT); Step 3: Read the CSV file Once we create the CSVPARSER object, we can use it to read the data in the CSV file.The following is an example code for reading CSV files: for (CSVRecord record : parser) { String name = record.get(0); int age = Integer.parseInt(record.get(1)); System.out.println("Name: " + name + ", Age: " + age); } In the above example code, we use the get () method to obtain the value of the CSV record according to the index and print it to the console. Step 4: Write into CSV files Similarly, once we create the CSVPrinter object, we can use it to write the data into the CSV file.The following is a sample code to write data to the CSV file: Printer.printRecord ("Zhang San", 25); Printer.printoldRcord ("Li Si", 30); printer.flush(); In the above example code, we use the PrintRecord () method to write the data into the CSV file, and use the Flush () method to refresh the data to the file. Step 5: Close resources After using CSVPARSER and CSVprinter objects, we need to close relevant resources.The following is a sample code for closing resources: parser.close(); printer.close(); In this way, we successfully use the Commons CSV (SANDBOX) framework to process the CSV file in the Java library. in conclusion: This article introduces how to use the Commons CSV (Sandbox) framework in the Java library to process the CSV file.We have learned how to import the Commons CSV library and create CSVPARSER and CSVprinter objects.We also learned how to read and write CSV files, and provide Java code examples when necessary.By mastering these technologies, you can better handle and operate CSV files.Hope this article will help you!