Golang 结合wkhtmltopdf 生成pdf文档

准备工作：

1、本地下载wkhtmltopdf https://wkhtmltopdf.org/downloads.html

2、按照步骤安装完成后配置 PATH 环境变量

3、开发文档 https://wkhtmltopdf.org/usage/wkhtmltopdf.txt

代码如下：

package htmltopdf

import (
    "context"
    "errors"
    "fmt"
    "io/ioutil"
    "log"
    "os/exec"
    "path/filepath"
)

var (
    argsError     = errors.New("no input file or out path")
    fileTypeError = errors.New("the file must be in pdf format")
)

type HtmlToPdf struct {
    Commond string
    in      string
    out     string
    argsMap map[string]string
    prams   []string
}

func NewPdf() *HtmlToPdf {
    args := map[string]string{
        "--load-error-handling": "ignore",
        "--footer-center":       "第[page]页/共[topage]页",
        "--footer-font-size":    "8",
        "-B":                    "31",
        "-T":                    "32",
    }
    return &HtmlToPdf{
        Commond: "wkhtmltopdf",
        argsMap: args,
    }
}

func (this *HtmlToPdf) OutFile(input string, outPath string) (string, error) {
    var pdfPath string
    // 输入 输出 参数不能为空
    if input == "" || outPath == "" {
        return pdfPath, argsError
    }
    //判断是否是生成pdf 文件
    ext := filepath.Ext(outPath)
    if ext != ".pdf" {
        return pdfPath, fileTypeError
    }
    this.in = input
    this.out = outPath
    //构建参数
    this.buildPrams()
    //执行命令
    bytes, err := this.doExce()
    if err != nil {
        return pdfPath, err
    }
    log.Printf("【wkhtmltopdf - stdout】:%s", string(bytes))
    return pdfPath, nil
}

func (this *HtmlToPdf) doExce() ([]byte, error) {
    ctx, cancel := context.WithCancel(context.Background())
    defer cancel()
    cmd := exec.CommandContext(ctx, this.Commond, this.prams...)
    stdout, err := cmd.StderrPipe()
    if err != nil {
        return nil, err
    }
    defer stdout.Close()
    //运行命令
    err = cmd.Start()
    if err != nil {
        return nil, err
    }
    bytes, err := ioutil.ReadAll(stdout)
    if err != nil {
        return nil, err
    }
    fmt.Println(string(bytes))
    fmt.Println("htmltopdf退出程序中=", cmd.Process.Pid)
    cmd.Wait()
    return bytes, err
}

func (this *HtmlToPdf) buildPrams() {
    for key, val := range this.argsMap {
        this.prams = append(this.prams, key, val)
    }
    //添加 输入 输出 参数
    this.prams = append(this.prams, this.in, this.out)
}

实例：

package main
import (
    "log"
    "fmt"
    "htmltopdf"
)
func main(){
    pdf :=htmltopdf.NewPdf()
    url,err:=pdf.OutFile("http://www.baidu.com","./test.pdf")
    if err != nil{
        log.Println(err)
    }
    fmt.Println(url)
}