直接计算自定义函数,无需先将其编写在工作表中

在不将其写入工作表的情况下直接计算自定义函数

请参阅以下示例代码,以了解此方法的用法。我们使用了一个名为*MyCompany.CustomFunction()*的自定义函数,我们自己计算其值为"Aspose.Cells.",然后此值会自动与单元A1的值"Welcome to “由计算引擎连接,并计算出最终计算后的值"Welcome to Aspose.Cells."。从代码中可以看到,我们没有在工作表中编写自定义函数,而是通过我们自己的自定义逻辑直接计算出来。

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
public class CustomEngine extends AbstractCalculationEngine
{
// Override the Calculate method with custom logic
public void calculate(CalculationData data)
{
// Check the forumla name and calculate it yourself
if (data.getFunctionName().equals("MyCompany.CustomFunction"))
{
// This is our calculated value
data.setCalculatedValue("Aspose.Cells.");
}
}
}
public static void main(String[] args) throws Exception {
// Create a workbook
Workbook wb = new Workbook();
// Accesss first worksheet
Worksheet ws = wb.getWorksheets().get(0);
// Add some text in cell A1
ws.getCells().get("A1").putValue("Welcome to ");
// Create a calculation options with custom engine
CalculationOptions opts = new CalculationOptions();
opts.setCustomEngine(new CustomEngine());
// This line shows how you can call your own custom function without
// a need to write it in any worksheet cell
// After the execution of this line, it will return
// Welcome to Aspose.Cells.
Object ret = ws.calculateFormula("=A1 & MyCompany.CustomFunction()", opts);
// Print the calculated value on Console
System.out.println("Calculated Value: " + ret.toString());
}

控制台输出

以下是上面示例代码的控制台输出。

 Calculated Value: Welcome to Aspose.Cells.

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