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

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

Abstract: This article introduces how to use the template function of the Go language to write a program that dynamically generates PDF reports, and uses the email sending library to implement the function of sending report files as attachments to emails.

1. Introduction
In modern enterprises, generating reports in PDF format is a very common task. The traditional way is to use Microsoft Office software or other report generation tools, but these tools may not be flexible enough or require additional costs. In this article, we will introduce how to use template functions in the Go language to dynamically generate PDF reports, and send the generated reports as attachments to emails through the email sending library.

2. Preparation
Before starting to write code, we need to ensure that the Go language running environment has been installed locally and the Go language development environment has been correctly configured. At the same time, we also need to install some necessary third-party libraries, such as libraries for generating PDF and libraries for sending emails.

3. Generate PDF reports
In Go language, we use the third-party library "go-pdflib" to generate reports in PDF format. The library provides a wealth of functions, such as setting page styles, inserting text, inserting tables, etc. In our example, we will show how to generate a simple tabular report.

First, we need to introduce the "go-pdflib" library into the code:

import "github.com/jung-kurt/gofpdf"

Then, we can define a function to generate the report:

func generatePDFReport() {
    pdf := gofpdf.New("P", "mm", "A4", "") // 创建一个新的PDF实例
    pdf.AddPage() // 添加一个新页面

    // 设置页面样式
    pdf.SetFont("Arial", "B", 14)
    pdf.CellFormat(190, 10, "Report Title", "", 1, "C", false, 0, "")

    // 生成表格数据
    data := [][]string{{"Name", "Age", "Email"}, {"John", "30", "john@example.com"}, {"Alice", "25", "alice@example.com"}}
    pdf.SetFont("Arial", "B", 12)
    pdf.SetFillColor(240, 240, 240)
    for _, row := range data {
        for _, cell := range row {
            pdf.CellFormat(63.3, 7, cell, "1", 0, "C", true, 0, "")
        }
        pdf.Ln(-1)
    }

    // 保存报表文件
    pdf.OutputFileAndClose("report.pdf")
}

In the above code , we first create a new PDF instance and add a new page. We then set the font style for the page title using the SetFont function, and drew a styled text on the page using the CellFormat function. Next, we use a nested loop to iterate over the tabular data and plot the data into tabular form using the CellFormat function. Finally, we use the OutputFileAndClose function to save the report file.

4. Sending emails
After we generate the report in PDF format, we can use the email sending library in the Go language to send the report email.

First, we need to introduce the email sending library into the code:

import "net/smtp"

Then, we can define a function to send the report email:

func sendEmailWithAttachment() {
    from := "sender@example.com"
    password := "password"
    to := "recipient@example.com"

    // 创建邮件消息
    msg := "Subject: PDF Report

Please find the attached PDF report."

    // 邮件附件
    file, err := os.Open("report.pdf")
    if err != nil {
        log.Fatal(err)
    }
    defer file.Close()

    // 创建邮件附件对象
    attachment := gomail.NewAttachment("report.pdf", file)
    attachment.Disposition = "attachment"

    // 创建邮件消息对象
    message := gomail.NewMessage()
    message.SetAddressHeader("From", from, "")
    message.SetAddressHeader("To", to, "")
    message.SetHeader("Subject", "PDF Report")
    message.SetBody("text/plain", msg)
    message.Attach(attachment)

    // 发送邮件
    d := gomail.NewDialer("smtp.example.com", 587, from, password)
    if err := d.DialAndSend(message); err != nil {
        log.Fatal(err)
    }
}

In the above code, we First define the email sender, password and recipient's email address. We then created an attachment containing the report file. Next, we create an email message object and set the sender, recipients, subject, and body content. Finally, we use the DialAndSend function to send the email.

5. Conclusion
By using the template function in the Go language, we can easily generate reports in PDF format and send the reports as attachments through the email sending library. Such a function is very useful in enterprise development, which can greatly simplify the process of report generation and email sending, and improve work efficiency. I hope this article will help you use template functions to generate PDF reports and send emails in Go language.

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