Learn the "JXL" framework technical principles in the Java library
JXL is a popular Java library for processing Microsoft Excel files.It provides a simple and easy -to -use API that enables developers to read, write and operate Excel files.When learning the JXL framework, you can abide by the following principles to obtain the best results:
Principle 1: Import the JXL library
Before starting JXL, you need to import the JXL library.You can download the latest version of JXL from the official website or Maven central warehouse.Add JXL's jar files to the class path of the Java project.
Principles 2: Create an excel file
To create a new Excel file, you can use examples of the Workbook class.The following is an example code for creating an Excel file called "Example.xls":
import jxl.Workbook;
import jxl.write.WritableWorkbook;
public class CreateExcelFile {
public static void main(String[] args) {
try {
WritableWorkbook workbook = Workbook.createWorkbook(new File("example.xls"));
// Here you can add worksheet and data
workbook.write();
workbook.close();
System.out.println ("EXCEL file creation successfully!"););
} catch (Exception e) {
System.out.println ("Error occurs when creating an excel file:" + E.getMessage ());
}
}
}
Principle 3: Add worksheet and data
You can use the examples of the Workbook class to add worksheets and data to Excel files.The following is an Excel file named "Example.xls" add a worksheet and sample code for some data:
import jxl.Workbook;
import jxl.write.Label;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
public class AddWorksheetExample {
public static void main(String[] args) {
try {
WritableWorkbook workbook = Workbook.createWorkbook(new File("example.xls"));
WritableSheet sheet = workbook.createSheet("Sheet1", 0);
Label label1 = new label (0, 0, "name");
sheet.addCell(label1);
Label label2 = new label (1, 0, "age");
sheet.addCell(label2);
Label label3 = new label (0, 1, "Zhang San");
sheet.addCell(label3);
Label label4 = new Label(1, 1, "25");
sheet.addCell(label4);
workbook.write();
workbook.close();
System.out.println ("Workheet and data added successfully!"););
} catch (Exception e) {
System.out.println ("" Error occurring when adding worksheets and data: " + e.getMessage ());
}
}
}
Principle 4: Read the excel file
To read the data in the Excel file, you can use the example of the Workbook class.The following is an example code of the data in the Excel file named "Example.xls":
import jxl.*;
public class ReadExcelFile {
public static void main(String[] args) {
try {
Workbook workbook = Workbook.getWorkbook(new File("example.xls"));
Sheet sheet = workbook.getSheet(0);
for (int row = 0; row < sheet.getRows(); row++) {
for (int column = 0; column < sheet.getColumns(); column++) {
Cell cell = sheet.getCell(column, row);
System.out.print(cell.getContents() + "\t");
}
System.out.println();
}
workbook.close();
} catch (Exception e) {
System.out.println ("Error occurs when reading the excel file:" + e.getMessage ());
}
}
}
The above are some basic principles to learn the JXL framework.By following these principles, you can better use the JXL library to handle Excel files to achieve various data operation and processing needs.
