Go 发送邮件

需要引入 smtp包 mail.go

package main

import (
    "bytes"
    "encoding/base64"
    "fmt"
    "io/ioutil"
    "net/smtp"
    "strings"
)

const const_smtp_server = "server-ip:port"

//const const_email_content_type = "Content-Type: text/plain; charset=UTF-8"
const const_email_content_type = "Content-Type: text/html; charset=UTF-8"
const const_boundary = "THIS_IS_THE_BOUNDARY_FOR_EMAIL_BY_LXB"

func SendEmail(sender string, receivers []string, subject string, content string, attach_files []string) error {

    var buf bytes.Buffer
    buf.WriteString("To: ")
    buf.WriteString(strings.Join(receivers, ","))
    buf.WriteString("\r\nFrom: ")
    //nickname := strings.Split(sender,"@")[0]
    //buf.WriteString(nickname)
    buf.WriteString("<")
    buf.WriteString(sender)
    buf.WriteString(">")
    buf.WriteString("\r\nSubject: ")
    buf.WriteString(subject)
    buf.WriteString("\r\nContent-Type: multipart/mixed; boundary=")
    buf.WriteString(const_boundary)
    buf.WriteString("\r\n--")
    buf.WriteString(const_boundary)
    buf.WriteString("\r\n")
    buf.WriteString(const_email_content_type)
    buf.WriteString("\r\n\r\n")
    buf.WriteString(content)
    buf.WriteString("\r\n\r\n--")
    buf.WriteString(const_boundary)
    buf.WriteString("\r\n")

    for _, filepath := range attach_files {
        // 第一个附件
        filedepts := strings.Split(filepath, "/")
        filename := filedepts[len(filedepts)-1]
        buf.WriteString("Content-Type: application/octet-stream\r\n")
        buf.WriteString("Content-Description: 附件\r\n")
        buf.WriteString("Content-Transfer-Encoding: base64\r\n")
        buf.WriteString("Content-Disposition: attachment; filename=\"" + filename + "\"\r\n\r\n")
        //读取并编码文件内容
        attaData, err := ioutil.ReadFile(filepath)
        if err != nil {
            print(err)
            return err
        }
        b := make([]byte, base64.StdEncoding.EncodedLen(len(attaData)))
        base64.StdEncoding.Encode(b, attaData)
        buf.Write(b)
        buf.WriteString(fmt.Sprintf("\r\n--%s\r\n", const_boundary))
    }

    fmt.Println(buf.String())
    err := smtp.SendMail(const_smtp_server, nil, sender, receivers, buf.Bytes())

    fmt.Println("send mail err:", err)
    return err
}

main.go

package main

import (
    //"flag"
    //"fmt"
    "os"
)

func main() {

    //var task string

    //flag.StringVar(&task, "t", "", "task id")
    //flag.Parse()

    //if task == "" {
    //  fmt.Println("task is required.")
    //  flag.Usage()
    //  os.Exit(2)
    //}

    testStr := os.Args[1]

    cont := "<html><body><p align=\"center\">表: 1</p><table align=\"center\" border=\"1\" cellpadding=\"10\"><tr><td>任务ID</td><td>列1</td><td>列2</td><td>列3</td></tr> <tr><td>" + testStr + "</td><td>" + testStr + "</td><td>" + testStr + "</td><td>" + testStr + "</td></tr></table></body></html>"

    sender := ""
    rcvs := []string{}
    sbj := "test email"
    //  cont := "This is content"
    file := []string{}

    SendEmail(sender, rcvs, sbj, cont, file)

}