The technical principles of the CSVEED framework in the Java class library

CSVEED is a JAVA class library that is used to read and write the CSV (comma segmental value) file.It provides a simple and flexible way to analyze, process and generate CSV files. The technical principle of CSVEED is based on the following key components: 1. CSV file parser: CSVEED uses a CSV parser to read and analyze the CSV file.The parser can identify the separators between the fields and fields in the CSV file and convert it to the Java object or data structure. 2. Map of the annotation drive: CSVEED uses Java annotations to mappore the fields of the CSV file and the attributes of the Java object.By adding annotations to the attributes of the Java object, the developer can specify which field in which the attribute corresponds to the CSV file.CSVEED can be automatically parsed and generated based on these annotations. Below is a simple example that demonstrates how to use the annotation to map the CSV file and Java object: public class Person { @CsvCell(index = 0) private String name; @CsvCell(index = 1) private int age; // omit the getter and setter method } In the above example, the `Person` class represents a line of records in the CSV file. 3. Data converter: CSVED provides some built -in data converters to convert the string data in the CSV file into the type of attribute type of the target Java object.For example, CSVEED can convert the string date to the `java.util.date` type, or convert the string numbers to the type of` int` or `float`. 4. Advanced function: In addition to basic CSV parsing and mapping functions, CSVEED also provides some advanced functions, such as dynamic mapping, condition mapping, custom converters, etc.These functions enable developers to handle different types of CSV files more flexibly. Below is a complete example, demonstrating how to read and write CSV files with CSVEED: CsvReader<Person> csvReader = new CsvReader<>(new FileReader("data.csv"), Person.class); List<Person> persons = csvReader.readAll(); // Treatment of Persons object CsvWriter<Person> csvWriter = new CsvWriter<>(new FileWriter("output.csv"), Person.class); csvWriter.writeAll(persons); csvWriter.close(); In the above example, we first created an `csvreader` object, which is responsible for reading the CSV file and mapped it into the list of objects of the` Person`.We then process the data we read.Finally, we create a `csvwriter` object to write the processed data into a new CSV file. In short, CSVEED is a powerful Java class library that can easily handle the reading and writing of CSV files.By using CSVEED, developers can quickly and flexibly analyze and generate CSV files to meet various data processing needs.