How to use Golang to convert PDF to HTML

Golang is an open source, cross-platform programming language. Its power lies in that it can be used in a variety of different application scenarios. Today we are going to discuss how to use Golang to convert PDF to HTML.

PDF is a common file format used to store some more complex documents or tables. However, PDF files are not easy to edit or copy, and often require special programs to open. HTML is a relatively common web page file format that can be easily read and rendered by browsers.

The question now is how to convert a PDF file to an HTML file so that it can be easily read by the browser? Fortunately, there are some off-the-shelf tools that can be used to accomplish this task. In this article, we are going to introduce one of them, using Golang for PDF conversion.

First, we need to install a Golang library, it is called Tika. Tika is an Apache Software Foundation project that can be used to extract text, metadata and structured content, or convert a file into a different format. We will use Tika to convert PDF files to HTML.

To install Tika, we only need to use the go get command:

go get github.com/hs0ucy/go-tika

Tika Depends on Java, so before using it, we need to install Java first. Then, we need to import the go-tika package:

import "github.com/hs0ucy/go-tika"

Next, we need to write some code to Convert PDF files to HTML files. The code is as follows:

package main

import (
    "fmt"
    "io/ioutil"

    tika "github.com/hs0ucy/go-tika"
)

func main() {
    t := tika.NewClient(nil, "http://localhost:9998/")
    file, err := ioutil.ReadFile("example.pdf")
    if err != nil {
        panic(err)
    }
    html, err := t.FromBytes(file)
    if err != nil {
        panic(err)
    }
    fmt.Println(html)
}

In this code, we first create a Tika client, then read a file named example.pdf and convert it into a byte array. Next, we use Tika to convert this byte array into an HTML string.

Finally, we print out the HTML string.

Now, we can test this program and see if it can successfully convert PDF files to HTML files. Run this program on the command line, and the output result will be an HTML string, which should be exactly the same as the content in the PDF file.

Of course, this is just a basic example, you can modify and optimize it according to your own needs. For example, you can save the HTML string as an HTML file or use it in a web application. Anyway, this example will show you how to use Golang for PDF conversion.

In short, using Golang to convert PDF is not a very complicated matter. You just need to install the Tika library and write some code. I hope this article can be helpful to you and provide you with some useful ideas and inspiration in development.

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