一个简单但是非常实用的pdf生成器！
安装：
go get github.com/jung-kurt/gofpdf
代码：
package main
import (
"github.com/jung-kurt/gofpdf"
)
func main() {
err := GeneratePdf("hello.pdf")
if err != nil {
panic(err)
}
}
// GeneratePdf generates our pdf by adding text and images to the page
// then saving it to a file (name specified in params).
func GeneratePdf(filename string) error {
pdf := gofpdf.New("P", "mm", "A4", "")
pdf.AddPage()
pdf.SetFont("Arial", "B", 16)
// CellFormat(width, height, text, border, position after, align, fill, link, linkStr)
pdf.CellFormat(190, 7, "Welcome to topgoer.com", "0", 0, "CM", false, 0, "")
// ImageOptions(src, x, y, width, height, flow, options, link, linkStr)
pdf.ImageOpti