golang html to pdf

With the rapid development of the Internet, PDF file format has become one of the mainstream formats for online reading, downloading and sharing. In some cases, we need to convert HTML files to PDF format for easy online reading, storage and sharing. Golang is an efficient programming language that excels in processing large amounts of data and handling high concurrent requests. In this article, we will introduce how to convert HTML files to PDF format using golang.

1. Install golang

First, we need to install golang. Before installing, make sure you have upgraded your operating system to the latest version. You can download the golang binary file from the golang official website (https://golang.org/), add environment variables and restart the command line interface after installation.

2. Installing dependencies

Before using golang to convert HTML to PDF, we need to install the following dependencies:

a) go-wkhtmltopdf

go-wkhtmltopdf is a library in golang that uses the wkhtmltopdf command line tool to convert HTML to PDF. You can install the library through the following command:

go get github.com/SebastiaanKlippert/go-wkhtmltopdf

b) wkhtmltopdf

wkhtmltopdf is an open source command line tool , which can convert HTML documents to PDF format. You can download the binary file for your operating system from the wkhtmltopdf official website (https://wkhtmltopdf.org/) and install it.

3. Writing golang code

Now that we have installed the necessary dependencies, we will write the golang code to convert HTML files to PDF. In this example, we will use the go-wkhtmltopdf library to perform HTML to PDF conversion. The following is a sample code that implements converting HTML to PDF:

package main

import (
  "log"
  "github.com/SebastiaanKlippert/go-wkhtmltopdf"
)

func main() {
  // Create new PDF generator
  pdfg, err := wkhtmltopdf.NewPDFGenerator()
  if err != nil {
    log.Fatal(err)
  }

  // Set options for PDF generator
  pdfg.AddPage(wkhtmltopdf.NewPage("https://stackoverflow.com/"))
  pdfg.Orientation.Set(wkhtmltopdf.OrientationPortrait)
  pdfg.PageSize.Set(wkhtmltopdf.PageSizeA4)

  // Create PDF document in memory
  err = pdfg.Create()
  if err != nil {
    log.Fatal(err)
  }

  // Write PDF to file
  err = pdfg.WriteFile("./output.pdf")
  if err != nil {
    log.Fatal(err)
  }
}

4. Explanation code

In this example, we first imported the go-wkhtmltopdf library and created a new PDF generator. We then set the options of the PDF generator, such as page orientation, page size, and HTML pages to convert. Finally, we create the PDF document in memory and write it to a disk file.

Among them, the following code snippet is used to set the generator options:

pdfg.AddPage(wkhtmltopdf.NewPage("https://stackoverflow.com/"))
pdfg.Orientation.Set(wkhtmltopdf.OrientationPortrait)
pdfg.PageSize.Set(wkhtmltopdf.PageSizeA4)

In the above example, we used the page URL of stackoverflow.com. You can replace it with any other page URL or the path to a local HTML file. Likewise, if you need to change the page size or orientation, you have the corresponding options.

5. Run the code

Now that the code has been written, we need to save the code as a main.go file and run the following command from the command line:

go run main.go

Before running the code, please make sure:

a) wkhtmltopdf is installed correctly.

b) Make sure the firewall on your computer is not blocking outgoing requests.

After running successfully, you will see a PDF file named output.pdf in the directory where the code is located.

6. Conclusion

In this article, we have introduced how to convert HTML to PDF format using golang. We use the go-wkhtmltopdf library to convert HTML to PDF and provide a simple sample code that can be used to convert HTML files to PDF format. If you need to convert a large number of HTML files to PDF, golang can also help you handle high concurrency and large data volume conversion operations. If you're looking for more advanced conversion options or a customizable PDF generator, you may want to use other tools. No matter what tool you choose, this article should provide some useful insights for beginners.

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