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 main
import (
"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 main
import (
"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
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 main
import (
"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 main
import (
"fmt"
"github.com/jung-kurt/gofpdf"
)
func main() {
pdf := gofpdf.New("P","")
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 main
import (
"fmt"
"github.com/jung-kurt/gofpdf"
)
func main() {
pdf := gofpdf.New("P", 11)
pdf.Image("test.png", 30, 0,false,"")
pdf.Text(50, 20,"test.png")
pdf.Image("test.gif", 40, 50,"test.gif")
pdf.Image("test.jpg", 130, 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 main
import (
"fmt"
"github.com/jung-kurt/gofpdf"
)
func main() {
pdf := gofpdf.New("P","")
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, -1)
pdf.Image("test.png", 12,"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 main
import (
"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")
}
