The technical principles of the SimplecsV framework in the Java library analysis
The technical principles of the SimplecsV framework in the Java library analysis
SimpleCSV is a Java class library for handling CSV files. It provides a convenient and easy -to -use API that can easily read and write CSV data.This article will analyze the technical principles of the SimpleCSV framework and provide some Java code examples.
1. Introduction to CSV files
The CSV (comma seminars) file is a common text file format that is used to store table data as pure text.Each line of the CSV file represents a record, and each field is separated by a comma.CSV files are usually used for data exchange and import and export operations.
2. Simplecsv framework overview
The SimpleCSV framework consists of some core categories and interfaces to read and write CSV files.It provides a convenient API that allows developers to easily operate CSV data.
-CSVReader: This class is used to read CSV files.It provides a readnext () method to read records in the CSV file by line and return a string array. Each array element represents the value of a field.
-CSVWriter: This class is used to write CSV files.It provides the Writnext () method to write a string array into a row of CSV files.
3. Technical analysis
The core of the SimpleCSV framework is based on the reading and writing operation of stream.When reading the CSV file, the CSVReader class uses a bufferedReader to read the data from the file by the file, and the data of each line is split into the field through the comma partition.The read data returns to the caller in the form of a string array.
When writing the CSV file, the CSVWRITER class uses BufferDWriter to write the data into the file.It connects each field into a line by comma and write the line into the file.
The SimpleCSV framework also provides some additional functions, such as customized separators, separators to rotation, and ignoring empty lines.These functions can be implemented by setting CSVPARSERSETITINGS and CSVWritersEtings.
4. Code example
Below is a simple example code to demonstrate how to read and write CSV files with the SimpleCSV framework.
Read the CSV file:
CsvReader reader = new CsvReader("data.csv");
String[] nextLine;
while ((nextLine = reader.readNext()) != null) {
for (String value : nextLine) {
System.out.print(value + " ");
}
System.out.println();
}
reader.close();
Write to CSV file:
CsvWriter writer = new CsvWriter("data.csv");
String[] entries = {"John", "Doe", "john.doe@example.com"};
writer.writeNext(entries);
writer.close();
The above code demonstrates how to read the CSV file named "Data.csv" and print its content to the console.At the same time, it also shows how to write a string of CSV files named "Data.csv".
in conclusion
The SimpleCSV framework simplifies the process of handling the CSV files of Java developers.Through the reading and writing operation of Stream, SimpleCSV can easily read and write CSV data.Its clear and concise API makes the operation CSV file more convenient.Whether it is data exchange or introduction, SimpleCSV is a very valuable tool.
