The use case and code example of the Fastexcel Writer framework in the Java class library
Case and code example of using the Fastexcel Writer framework
Fastexcel Writer is a powerful tool in the Java class library for generating and operating data in the Excel document.It provides a simple and efficient way to generate Excel files and solve the performance problems when dealing with a large amount of data in the Java program.Below is a case and some code examples that use the Fastexcel Writer.
Suppose we have a student management system that we need to export the student's performance information to the Excel document.We can use Fastexcel Writer to implement this feature.
First, we need to introduce the dependency item of Fastexcel Writer.You can add the following code to the pom.xml file of the project:
<dependency>
<groupId>com.github.dhatim</groupId>
<artifactId>fastexcel-writer</artifactId>
<version>latest-version</version>
</dependency>
Next, we can create a Java class called "Student" to represent students.This class contains students' names and grade attributes.
public class Student {
private String name;
private int score;
// Construct function, Getter, and Setter method
// ...
}
In the export function, we can create a Java class called "Excelexporter", which encapsulates the logic of generating excel documents with FASTEXCEL WRITER.
import com.github.dhatim.fastexcel.Workbook;
import com.github.dhatim.fastexcel.Worksheet;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
public class ExcelExporter {
public static void exportToExcel(List<Student> students, String filePath) {
try (Workbook workbook = new Workbook(new FileOutputStream(filePath))) {
Worksheet worksheet = workbook.newWorksheet("成绩表");
Worksheet.value (0, 0, "name");
Worksheet.value (0, 1, "grade");
int row = 1;
for (Student student : students) {
worksheet.value(row, 0, student.getName());
worksheet.value(row, 1, student.getScore());
row++;
}
workbook.finish();
} catch (IOException e) {
e.printStackTrace();
}
}
// Test export function
public static void main(String[] args) {
List <student> Students = // Get student data
exportToExcel(students, "students.xlsx");
}
}
In the above code, we first create a workbook object, and then create a Workshet object, named "Grade Table".Then, we set the value in Excel cell by calling the Value method of the WorkSheet object.Finally, we call Workbook's Finish method to complete the generation of excel files.
By running the above code, an Excel file called "Students.xlsx" is generated in the project root directory, which contains the student's grade information.
To sum up, the process of using Fastexcel Writer can simplify and generate the excel document.We only need to use a few simple APIs to complete the generation of excel files, which improves the performance and efficiency when processing a large amount of data.
