golang office to html

Golang is an efficient programming language that is widely used in big data, network programming, cloud computing and other fields. In these fields, it is often necessary to convert Office documents into HTML format for display on the Web or other operations. This article will introduce how to use Golang to implement the Office to HTML function.

1. Office to HTML

Office documents usually include Word, Excel, PowerPoint and other formats. Their encoding methods and data structures are different, so they require different conversion methods. This article only takes a Word document as an example for explanation.

1. Word document conversion

Word document is a complex data structure, which contains various elements such as fonts, styles, formats, text and images, so when converting There are many situations that need to be handled when converting into HTML format.

First you need to parse the Word document into a DOM structure, and then convert it into an HTML document according to DOM rules. This process generally requires the use of software or components such as Microsoft Office Word, OpenOffice or LibreOffice. Taking Microsoft Office Word as an example, you can use the Office.Interop.Word component to parse the Word document into a DOM structure, and then convert the DOM structure into HTML format.

2. Excel document conversion

Excel document is also a complex data structure, which contains cells, rows, columns, worksheets, styles, formats, charts, etc. elements. Therefore, data extraction and formatting are required when converting to HTML format.

You can use the GoExcel component to parse the Excel document into a structure, and then write the HTML document row by row and column by row according to the data in the structure. When writing an HTML document, special processing is required based on cell merging, cell styles, etc.

2. Golang implements Office to HTML

1. Word document conversion

In Golang, you can use the Go-ole library to access the Microsoft Office Word component. Parse Word documents into DOM structures. The Go-ole library provides a set of API interfaces that can access and operate COM objects. You can use the following code to open a Word document and parse it into a DOM structure:

// 使用Go-ole库访问Microsoft Office Word组件
word, err := oleutil.CreateObject("Word.Application")
if err != nil {
   panic(err)
}
defer word.Release()

// 打开Word文档
doc, err := oleutil.CallMethod(word, "Documents", "Open", "path/to/word.docx")
if err != nil {
   panic(err)
}
defer doc.Release()

// 获取DOM结构
wordXML, err := oleutil.GetProperty(doc, "WordXML")
if err != nil {
   panic(err)
}
defer wordXML.Clear()

After parsing into a DOM structure, you can use the goquery library to convert the DOM structure into HTML format and write it to the file. The goquery library provides a set of API interfaces that can operate and convert DOM structures. You can use the following code to convert the DOM structure into HTML format:

// 将DOM结构转换成HTML文档
html := ""
jqueryDoc, err := goquery.NewDocumentFromReader(strings.NewReader(wordXML.ToString()))
if err == nil {
    jqueryDoc.Find("w\:document").Children().ChildrenFiltered("w\:body").Children().Each(func(i int, selection *goquery.Selection) {
        html += selection.Text()
    })
}

// 将HTML文档写入文件
file, err := os.Create("path/to/word.html")
if err != nil {
    panic(err)
}
defer file.Close()
writer := bufio.NewWriter(file)
_, err = writer.WriteString(html)
if err != nil {
    panic(err)
}
writer.Flush()

2. Excel document conversion

In Golang, you can use the GoExcel library to access the Excel document and parse the Excel document into a structure. The GoExcel library provides a set of API interfaces that can access cells, rows, columns, worksheets and other elements of Excel documents. You can use the following code to open an Excel document and parse it into a structure:

// 使用GoExcel库访问Excel文档
xls, err := excelize.OpenFile("path/to/excel.xlsx")
if err != nil {
   panic(err)
}

// 获取第一个工作表中的所有行和列
rows, err := xls.GetRows("Sheet1")
if err != nil {
   panic(err)
}
cols, err := xls.GetCols("Sheet1")
if err != nil {
   panic(err)
}

// 将Excel文档解析成结构体
type Cell struct {
   Value string
}
type Row struct {
   Cells []Cell
}
type Excel struct {
   Rows []Row
}
var excel Excel
for _, row := range rows {
   var r Row
   for _, cell := range row {
      r.Cells = append(r.Cells, Cell{Value: cell})
   }
   excel.Rows = append(excel.Rows, r)
}

After parsing into a structure, you can use the html/template library to write the structure into an HTML document row by row and column by column, and then write the HTML document Special processing such as cell merging and cell styles is performed. The html/template library provides a set of API interfaces that can render variables in Go into HTML text. You can use the following code to convert Excel documents into HTML format:

// 将结构体渲染成HTML文本
html := ""
t := template.New("excel.html")
t, _ = t.Parse(`{{ define "table" }}
                  <table>
                    {{ range .Rows }}
                      <tr>
                        {{ range .Cells }}
                          <td colspan="{{if gt .Count 1}}{{.Count}}{{else}}1{{end}}">
                            {{.Value}}
                          </td>
                        {{ end }}
                      </tr>
                    {{ end }}
                  </table>
                {{ end }}`)
t.ExecuteTemplate(&html, "table", struct {
   Rows []Row
}{Rows: excel.Rows})

// 将HTML文本写入文件
file, err := os.Create("path/to/excel.html")
if err != nil {
   panic(err)
}
defer file.Close()
writer := bufio.NewWriter(file)
_, err = writer.WriteString(html)
if err != nil {
   panic(err)
}
writer.Flush()

3. Summary

By using Golang to implement the Office to HTML function, Office documents can be quickly and efficiently converted into HTML format. And perform display or other operations on the Web side. This article takes Word documents and Excel documents as examples to introduce the complete process of how Golang accesses Microsoft Office Word components and Excel documents, and performs parsing and conversion. In actual applications, appropriate adjustments and expansions can be made according to different needs and scenarios to better meet business needs.

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