Principles of Delimited Core framework in the Java Class Library
The Delimited Core framework is a practical tool for processing the format data of separators in the Java class library.Differential format data refers to the text files that are separated by the differential data field. Common examples include CSV files and TSV files.
The implementation principle of the Delimited Core framework mainly includes the following steps:
1. Read the data file: Read the class library with the file of Java, such as `bufferedReader`, read the data file in the partition format format.
2. Differential data field: For the data read each row, use a function similar to the method of `String.split ()`, and divide the data row into multiple fields according to the specified separator.The separators can be a common separatist character such as commas, watchmaking, spaces, etc.
3. Data processing: Make the necessary data processing for each field, such as removing the space at both ends of the field or converting into a specific data type.
4. Data storage or operation: According to business needs, the processed data is stored to the database, output to the file or other operations.
Below is a simple Java code example, showing how to use the Delimited Core framework to process the CSV file:
import com.opencsv.CSVReader;
import java.io.FileReader;
import java.io.IOException;
public class DelimitedCoreExample {
public static void main(String[] args) {
String csvFilePath = "data.csv";
try (CSVReader reader = new CSVReader(new FileReader(csvFilePath))) {
String[] nextLine;
while ((nextLine = reader.readNext()) != null) {
// Treat each line of data
for (String field : nextLine) {
// Make the necessary data processing
String processedField = field.trim();
// Business logic operation, such as storage or output
System.out.print(processedField + " ");
}
System.out.println();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
The above code uses a third -party library `OpenCSV` to handle the CSV file.In the `Try-With-Resources" sentence block, first created a `csvreader` object, and the file path passed into the CSV file.Then use the `Readnext () method of the` Reader` object to read the data in the CSV file row.For each line of data, use the `For-Each` to circulate each field and perform the necessary data processing, such as removing the two-terminal space.Finally, through business logic operations, such as output to the console.
By using the Delimited Core framework, we can more conveniently process the data of the separatist format format to improve the efficiency and flexibility of data processing.Whether it is a CSV file or other data files in the format format, it can be operated in a similar way.
