依据 smtp协议的简单golang 的发邮件实现
package email import ("bytes"
"encoding/base64"
"fmt"
"io/ioutil"
"net/smtp"
"strings"
"time"
)
//SendEmailWithAttachment : send email with attachment
func SendEmailWithAttachment(user, passwd, host, to, subject string) error {
hp := strings.Split(host, ":")
auth := smtp.PlainAuth("", user, passwd, hp)
buffer := bytes.NewBuffer(nil)
boudary := "THIS_IS_BOUNDARY_JUST_MAKE_YOURS"
header := fmt.Sprintf("To:%s\r\n"+
"From:%s\r\n"+
"Subject:%s\r\n"+
"Content-Type:multipart/mixed;Boundary=\"%s\"\r\n"+
"Mime-Version:1.0\r\n"+
"Date:%s\r\n", to, user, subject, boudary, time.Now().String())
buffer.WriteString(header)
fmt.Print(header)
msg1 := "\r\n\r\n--" + boudary + "\r\n" + "Content-Type:text/plain;\r\n\r\n这是正文啊\r\n"
buffer.WriteString(msg1)
fmt.Print(msg1)
msg2 := fmt.Sprintf(
"\r\n--%s\r\n"+
"Content-Transfer-Encoding: base64\r\n"+
"Content-Disposition: attachment;\r\n"+
"Content-Type:image/jpg;name=\"test.jpg\"\r\n", boudary)
buffer.WriteString(msg2)
fmt.Print(msg2)
attachmentBytes, err := ioutil.ReadFile("./test.jpg")
if err != nil {
fmt.Println("ReadFile ./test.jpg Error : " + err.Error())
return err
}
b := make([]byte, base64.StdEncoding.EncodedLen(len(attachmentBytes)))
base64.StdEncoding.Encode(b, attachmentBytes)
buffer.WriteString("\r\n")
fmt.Print("\r\n")
fmt.Print("图片base64编码")
for i, l := 0, len(b); i < l; i++ {
buffer.WriteByte(b)
if (i+1)%76 == 0 {
buffer.WriteString("\r\n")
}
}
buffer.WriteString("\r\n--" + boudary + "--")
fmt.Print("\r\n--" + boudary + "--")
sendto := strings.Split(to, ";")
err = smtp.SendMail(host, auth, user, sendto, buffer.Bytes())
return err
}
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