Detailed analysis and instance demonstration of the technical principles of the SimpleCSV framework in the Java class library
SimpleCSV is a simple and easy -to -use Java class library for processing CSV files.It provides the function of basic reading and writing to the CSV file, and also supports customizers and quotes.This article will analyze the technical principles of the SimpleCSV framework in detail and provide examples and Java code examples.
Technical principle of SimpleCSV framework:
1. CSV file format: CSV file is a text file format that separates different fields in a comma (or other characters).Each line represents a record, and the different fields of the records are distinguished by separators.The content of the field can be wrapped with quotes character to process the cases that include separators.
2. Read CSV file: SimpleCSV reads every line of data of CSV files through BufferedReader.Use the Split method to split each line of data into field array according to the separators.If the field is wrapped in quotes, you need to remove the quotes and keep the separators in the field.
3. Write to CSV file: Simplecsv writes data to the CSV file through BufferedWriter.When writing each line of data, the field needs to be stitched into string according to the separators and quotes.If the field contains the separators, you need to use a quotation section.
Example demonstration:
The following is a simple instance demonstration that shows how to read and write the CSV file with the SimpleCSV framework:
import java.io.IOException;
import java.util.List;
import io.github.biezhi.csv.CsvReader;
import io.github.biezhi.csv.CsvWriter;
public class SimplecsvExample {
public static void main(String[] args) {
// Read the CSV file
try {
CsvReader csvReader = new CsvReader("input.csv");
List<String[]> data = csvReader.read();
for (String[] row : data) {
for (String field : row) {
System.out.print(field + " ");
}
System.out.println();
}
csvReader.close();
} catch (IOException e) {
e.printStackTrace();
}
// Write into CSV files
try {
CsvWriter csvWriter = new CsvWriter("output.csv");
csvWriter.write(new String[]{"Name", "Age", "City"});
csvWriter.newLine();
csvWriter.write(new String[]{"John", "25", "New York"});
csvWriter.newLine();
csvWriter.write(new String[]{"Alice", "30", "London"});
csvWriter.flush();
csvWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
In the above example, we first read the CSV file named "Input.csv" with CSVReader and print out the data of each line.Then use CSVWriter to create a CSV file called "Output.csv" and write several lines of data.
Through the SimpleCSV framework, we can easily read and write the CSV file, simplifying the processing process of the CSV file.Whether it is processing a large amount of data or only a few lines of records, SimpleCSV provides simple and effective methods to complete these tasks.
