Go实战--golang中操作PDF(rsc.io/pdf、jung-kurt/gofpdf、signintech/gopdf)

生命不止，继续 go go go !!!

昨天介绍了golang中如何操作excel：
Go实战–golang中操作excel(tealeg/xlsx、360EntSecGroup-Skylar/excelize)

那么今天就跟大家分享一下，golang中如何操作PDF。

PDF简介

The Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.[3] Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it.

pdf（Portable Document Format的简称，意为“便携式文档格式”），是由Adobe Systems用于与应用程序、操作系统、硬件无关的方式进行文件交换所发展出的文件格式。PDF文件以PostScript语言图象模型为基础，无论在哪种打印机上都可保证精确的颜色和准确的打印效果，即PDF会忠实地再现原稿的每一个字符、颜色以及图象。

rsc.io/pdf

github地址：
https://github.com/rsc/pdf

Star: 202

文档地址：
https://godoc.org/rsc.io/pdf

获取：

go get rsc.io/pdf

读取PDF文件，获取总页数

package mainimport (    "fmt"    "rsc.io/pdf")func main() {    file, err := pdf.Open("go.pdf")    if err != nil {        panic(err)    }    fmt.Println(file.NumPage())}

读取某一页的内容

package mainimport (    "fmt"    "rsc.io/pdf")func main() {    file, err := pdf.Open("test.pdf")    if err != nil {        panic(err)    }    fmt.Println(file.Page(2).Content())}

jung-kurt/gofpdf

注意：该库不支持中文！！！

github地址：
https://github.com/jung-kurt/gofpdf

Star: 733

文档地址：
https://godoc.org/github.com/jung-kurt/gofpdf

获取：

go get github.com/jung-kurt/gofpdf

生成PDF文档

package mainimport (    "fmt"    "github.com/jung-kurt/gofpdf")func main() {    pdf := gofpdf.New("P", "mm", "A4", "")    pdf.AddPage()    pdf.SetFont("Arial", "B", 26)    pdf.Cell(40, 10, "Hello PDF World")    err := pdf.OutputFileAndClose("write_pdf.pdf")    if err != nil {        fmt.Println(err)    }}

生成加密的PDF

package mainimport (    "fmt"    "github.com/jung-kurt/gofpdf")func main() {    pdf := gofpdf.New("P", "mm", "A4", "")    pdf.SetProtection(gofpdf.CnProtectPrint, "123", "abc")    pdf.AddPage()    pdf.SetFont("Arial", "", 12)    pdf.Write(10, "You Must Enter the Password!!!")    err := pdf.OutputFileAndClose("write_pdf_with_password.pdf")    if err != nil {        fmt.Println(err)    }}

PDF中插入图片

package mainimport (    "fmt"    "github.com/jung-kurt/gofpdf")func main() {    pdf := gofpdf.New("P", "mm", "A4", "")    pdf.AddPage()    pdf.SetFont("Arial", "", 11)    pdf.Image("test.png", 10, 10, 30, 0, false, "", 0, "")    pdf.Text(50, 20, "test.png")    pdf.Image("test.gif", 10, 40, 30, 0, false, "", 0, "")    pdf.Text(50, 50, "test.gif")    pdf.Image("test.jpg", 10, 130, 30, 0, false, "", 0, "")    pdf.Text(50, 140, "test.jpg")    err := pdf.OutputFileAndClose("write_pdf_with_image.pdf")    if err != nil {        fmt.Println(err)    }}

PDF中增加链接、HTML

package mainimport (    "fmt"    "github.com/jung-kurt/gofpdf")func main() {    pdf := gofpdf.New("P", "mm", "A4", "")    pdf.AddPage()    pdf.SetFont("Helvetica", "", 20)    _, lineHt := pdf.GetFontSize()    pdf.Write(lineHt, "To find out what's new in this tutorial, click ")    pdf.SetFont("", "U", 0)    link := pdf.AddLink()    pdf.WriteLinkID(lineHt, "here", link)    pdf.SetFont("", "", 0)    // Second page: image link and basic HTML with link    pdf.AddPage()    pdf.SetLink(link, 0, -1)    pdf.Image("test.png", 10, 12, 30, 0, false, "", 0, "http://blog.csdn.net/wangshubo1989?viewmode=contents")    pdf.SetLeftMargin(45)    pdf.SetFontSize(14)    _, lineHt = pdf.GetFontSize()    htmlStr := `You can now easily print text mixing different styles: <b>bold</b>, ` +        `<i>italic</i>, <u>underlined</u>, or <b><i><u>all at once</u></i></b>!<br><br>` +        `<center>You can also center text.</center>` +        `<right>Or align it to the right.</right>` +        `You can also insert links on text, such as ` +        `<a href="http://www.fpdf.org">http://blog.csdn.net/wangshubo1989?viewmode=contents</a>, or on an image: click on the logo.`    html := pdf.HTMLBasicNew()    html.Write(lineHt, htmlStr)    err := pdf.OutputFileAndClose("write_html.pdf")    if err != nil {        fmt.Println(err)    }}

signintech/gopdf

既然jung-kurt/gofpdf不支持中文，那么就介绍一个支持中文的signintech/gopdf。

github地址：
https://github.com/signintech/gopdf

Star: 422

获取：

go get -u github.com/signintech/gopdf

生成PDF文件

为了炫酷一点，自己从网上下载一个字体。

package mainimport (    "log"    "github.com/signintech/gopdf")func main() {    pdf := gopdf.GoPdf{}    pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: 595.28, H: 841.89}}) //595.28, 841.89 = A4    pdf.AddPage()    err := pdf.AddTTFFont("wts11", "TTENuoJ_0.ttf")    if err != nil {        log.Print(err.Error())        return    }    err = pdf.SetFont("wts11", "", 14)    if err != nil {        log.Print(err.Error())        return    }    pdf.Cell(nil, "我闭目在经殿的香雾中， 蓦然听见你颂经中的真言；")    pdf.WritePdf("hello.pdf")}