How to use template functions in Go language to dynamically generate Excel reports and send emails?

How to use template functions in Go language to dynamically generate Excel reports and send emails?

1. Introduction
In the actual development process, we often encounter the need to generate Excel reports and send them via email. Through its powerful template functions and third-party libraries, Go language can easily realize the dynamic generation and email sending functions of Excel reports. This article will introduce in detail how to use template functions in the Go language to dynamically generate Excel reports and send emails.

2. Generate Excel reports
First, we need to install and introduce the third-party library "tealeg/xlsx", which provides the function of generating and operating Excel files. The library can be installed with the following command:

go get github.com/tealeg/xlsx

Introduce the library:

import "github.com/tealeg/xlsx"

Next, we can use the library to create a new Excel file and add content to it. The following is a sample code:

func generateExcel() error {
    // 创建新的Excel文件
    file := xlsx.NewFile()
  
    // 创建工作表
    sheet, err := file.AddSheet("Sheet1")
    if err != nil {
        return err
    }
  
    // 向工作表中添加数据
    row := sheet.AddRow()
    cell := row.AddCell()
    cell.Value = "姓名"
  
    cell = row.AddCell()
    cell.Value = "年龄"
  
    row = sheet.AddRow()
    cell = row.AddCell()
    cell.Value = "张三"
  
    cell = row.AddCell()   
    cell.Value = "25"
  
    // 保存Excel文件
    err = file.Save("report.xlsx")
    if err != nil {
        return err
    }
  
    return nil
}

In the above code, we first create a new Excel file, then create a worksheet named "Sheet1" and add a header row and a row of data to it . Finally, we save the Excel file as "report.xlsx".

3. Sending emails
Next, we need to install and introduce the third-party library "gomail", which provides the function of sending emails. The library can be installed through the following command:

go get gopkg.in/gomail.v2

Introduce the library:

import "gopkg.in/gomail.v2"

Next, we can use this library to send emails with attachments. The following is a sample code:

func sendEmail() error {
    m := gomail.NewMessage()
  
    // 设置邮件发送人和收件人
    m.SetHeader("From", "your-email@example.com")
    m.SetHeader("To", "recipient@example.com")
    m.SetHeader("Subject", "Excel Report")
  
    // 添加附件
    m.Attach("report.xlsx")
  
    // 通过SMTP发送邮件
    d := gomail.NewPlainDialer("smtp.example.com", 587, "your-email@example.com", "your-password")
    err := d.DialAndSend(m)
    if err != nil {
        return err
    }
  
    return nil
}

In the above code, we create a new email and set the sender, recipient and subject of the email. Then, we add the Excel report as an attachment by calling the Attach method. Finally, we send the email via SMTP and specify the SMTP server address, port number, email address, and password.

4. Integration code
Now, we can integrate the functions of generating Excel reports and sending emails, and use template functions to dynamically generate the content of the report. The following is a sample code:

func generateAndSend() error {
    // 生成Excel报表
    if err := generateExcel(); err != nil {
        return err
    }
  
    // 发送邮件
    if err := sendEmail(); err != nil {
        return err
    }
  
    return nil
}

In the above code, we encapsulate the functions of generating Excel reports and sending emails into a function named generateAndSend. By calling this function, we can complete the generation of Excel reports and sending emails at one time.

5. Summary
Through the powerful template functions and third-party libraries in the Go language, we can easily dynamically generate Excel reports and send them to designated recipients via email. In actual development, we can customize it according to specific needs, such as generating report content based on data in the database, setting the subject and body of the email, etc. I hope this article can be helpful to you, thank you for reading!

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