Excel Templateer framework Java class library best practice guide
Excel Templateer framework Java class library best practice guide
Overview:
Excel Templateer framework is a powerful Java class library for generating Excel documents.This article will introduce the best practical guide to Excel Templateer framework and provide some Java code examples to help you generate Excel documents more efficiently and flexibly when using this framework.
1. Introduce Excel Templateer framework:
First, you need to introduce the Excel Templator framework into your project.You can add the following dependencies to Maven or Gradle configuration files:
Maven:
<dependency>
<groupId>com.github.jxls</groupId>
<artifactId>jxls</artifactId>
<version>2.8.0</version>
</dependency>
Gradle:
groovy
implementation 'com.github.jxls:jxls:2.8.0'
2. Design Excel template:
Before starting the Excel document, you need to design an Excel template.This template will determine the layout, style and data filling position of the document.You can use the Excel editor (such as Microsoft Excel) to create your template.Make sure you set a reasonable table structure for the template, and place data occupying symbols in a suitable location.
Below is a simple example Excel template for generating student transcripts:
|-----------------------------------------------|
| Student transcript |
|-----------------------------------------------|
| Student Name | Discipline | Score | Ranking |
|-----------------------------------------------|
| {{name}} | {{subject}} | {{score}} | {{ranking}} |
|-----------------------------------------------|
In the template, we use dual brackets ({{}}) as data placement symbols.These placeholders will be replaced by actual values when filling data.
3. Fill in data:
Once the Excel template is designed, we can start filling the data.Through the Excel Templateer framework, we can fill the data to the corresponding position in the template.
The following is an example of Java code, demonstrating how to fill in the data to the Excel template:
try(InputStream is = new FileInputStream("path/to/template.xls")) {
try (OutputStream os = new FileOutputStream("path/to/output.xls")) {
Context context = new Context();
List <strongnt> studers = getStudents (); // Get student data
context.putvar ("Students", Students); // Put student data in Context in Context
Jxlshelper.getInstance (). ProcessSesstermplate (is, OS, Context); // process the template
System.out.println ("Excel generated success!");
}
} catch (IOException e) {
e.printStackTrace();
}
In the above example, we first loaded the Excel template ("Path/To/Template.xls"), and then create a Context object to save the data that needs to be filled.We put the student's data list into Context by calling the `putvar` method, and specify a name (" Students ") to quote this data.
Finally, we handle the template by calling the `ProcessSessterMPlate" method to fill the data into the Excel document.The processing results will be written into the specified output stream ("PATH/To/OUTPUT.XLS").
4. Export Excel document:
Through the above code, we have generated an Excel document that fills the data.Now we can export them to local files or directly provide users to download.
The following is a sample Java code to demonstrate how to export Excel documents:
try(InputStream is = new FileInputStream("path/to/template.xls")) {
try (OutputStream os = new FileOutputStream("path/to/output.xls")) {
// ... the code of filling the data
// ... call jxlshelper.processStatemplate () method
Jxlshelper.getInstance (). ProcessSesstermplate (is, OS, Context); // process the template
System.out.println ("Excel generated success!");
}
// Set the response header
response.setHeader("Content-Disposition", "attachment; filename=output.xls");
response.setContentType("application/vnd.ms-excel");
try (OutputStream os = response.getOutputStream()) {
FileUtils.copy(new File("path/to/output.xls"), os);
os.flush();
}
} catch (IOException e) {
e.printStackTrace();
}
In the above examples, we have added some export logic.First, after processing the template, we write the results into a local file ("Path/To/Output.xls").
We then set the response header, specify the file name ("Output.xls"), and the MIME type ("Application/VND.MS-EXCEL").Finally, we bind the output stream to the `getoutPutstream` method of the response object to send the excel document to the user.
Summarize:
This guide introduces the best practice of the Excel Templator framework and provides an example Java code to help you generate Excel documents more efficiently and flexibly when using this framework.With these knowledge and examples, you can better master the skills of using the Excel Templateer framework and apply it in actual projects.
