mail

+package common
+
+import (
+	"bytes"
+	"crypto/tls"
+	"fmt"
+	"log"
+	"mime"
+	"net"
+	"net/smtp"
+)
+
+var(
+	ErrorInvalidMailConfig = fmt.Errorf("mail config error")
+)
+
+var DefaultMail *MailService
+//邮件配置
+type MailConfig struct {
+	Host string
+	Port int
+	From string
+	Password string
+	IsUseSsl bool
+}
+
+//初始化邮件服务
+func InitMailService(mail *MailConfig){
+	DefaultMail = NewMailService(mail)
+}
+type MailService struct {
+	Config *MailConfig
+}
+func NewMailService(config *MailConfig)*MailService{
+	return &MailService{
+		Config:config,
+	}
+}
+//to: 邮件发送目标 多个
+func (mail *MailService)SendMail(to []string, subject string, body []byte)(err error){
+	if err =mail.CheckConfig();err!=nil{
+		return
+	}
+	address :=fmt.Sprintf("%v:%v",mail.Config.Host,mail.Config.Port)
+	auth := smtp.PlainAuth("", mail.Config.From, mail.Config.Password, mail.Config.Host)
+	if !mail.Config.IsUseSsl{ //qq 普通发送 端口25
+		// hostname is used by PlainAuth to validate the TLS certificate.
+		err = smtp.SendMail(address, auth, mail.Config.From,to, body)
+		if err != nil {
+			return err
+		}
+		return
+	}
+	if err=SendMailUsingTLS(address, auth, mail.Config.From,to, body);err!=nil{
+		return
+	}
+	return
+}
+//检查配置
+func(mail *MailService)CheckConfig()error{
+	config :=mail.Config
+	if len(config.Host)==0 || len(config.From)==0 || config.Port==0 || len(config.Password)==0{
+		return ErrorInvalidMailConfig
+	}
+	return nil
+}
+
+//邮件内容
+type MailContent struct {
+	ToMail string
+	Subject string
+	Body []byte
+	ContentType string //html /plain
+}
+//发送邮件
+func SendMail(content *MailContent)(err error){
+	if DefaultMail==nil{
+		return ErrorInvalidMailConfig
+	}
+	var to,subject,contentType string
+	var body []byte
+	to = content.ToMail
+	subject = content.Subject
+	contentType = content.ContentType
+	if contentType==""{
+		contentType="text/html; charset=UTF-8"
+	}
+	header :=make(map[string]string)
+	header["From"] = mime.BEncoding.Encode("utf-8",DefaultMail.Config.From) //from 使用其他字符串,显示xx发送 代发为 DefaultMail.Config.From
+	header["To"] = to
+	header["Subject"] = mime.BEncoding.Encode("utf-8",subject)
+	header["Content-Type"] = contentType
+	var buf bytes.Buffer
+	for k, v := range header {
+		buf.WriteString(fmt.Sprintf("%s: %s\r\n", k, v))
+	}
+	buf.WriteString("\r\n")
+	buf.Write(body)
+	return  DefaultMail.SendMail([]string{to},subject,buf.Bytes())
+}
+//使用 ssl发送  端口465
+//return a smtp client
+func Dial(addr string) (*smtp.Client, error) {
+	conn, err := tls.Dial("tcp", addr, nil)
+	if err != nil {
+		log.Panicln("Dialing Error:", err)
+		return nil, err
+	}
+	//分解主机端口字符串
+	host, _, _ := net.SplitHostPort(addr)
+	return smtp.NewClient(conn, host)
+}
+//参考net/smtp的func SendMail()
+//使用net.Dial连接tls(ssl)端口时,smtp.NewClient()会卡住且不提示err
+//len(to)>1时,to[1]开始提示是密送
+func SendMailUsingTLS(addr string, auth smtp.Auth, from string,
+	to []string, msg []byte) (err error) {
+
+	//create smtp client
+	c, err := Dial(addr)
+	if err != nil {
+		log.Println("Create smpt client error:", err)
+		return err
+	}
+	defer c.Close()
+
+	if auth != nil {
+		if ok, _ := c.Extension("AUTH"); ok {
+			if err = c.Auth(auth); err != nil {
+				log.Println("Error during AUTH", err)
+				return err
+			}
+		}
+	}
+
+	if err = c.Mail(from); err != nil {
+		return err
+	}
+
+	for _, addr := range to {
+		if err = c.Rcpt(addr); err != nil {
+			return err
+		}
+	}
+
+	w, err := c.Data()
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(msg)
+	if err != nil {
+		return err
+	}
+
+	err = w.Close()
+	if err != nil {
+		return err
+	}
+	return c.Quit()
+}

+package common
+
+import (
+	"testing"
+)
+
+//Example
+func TestSendMail(t *testing.T) {
+	InitMailService(&MailConfig{
+		Host:"smtp.qq.com",
+		Port:25,
+		From:"785410885@qq.com",
+		Password:"ibfduqhfmgypbffe", //授权码
+		IsUseSsl:false,
+	})
+	//SendMail(&MailContent{
+	//	ToMail:"892423867@qq.com",
+	//	Subject:"测试邮件",
+	//	Body:[]byte("邮件内容..."),
+	//})
+}
+
+func TestSendMailTls(t *testing.T) {
+	InitMailService(&MailConfig{
+		Host:"smtp.qq.com",
+		Port:465,
+		From:"785410885@qq.com",
+		Password:"ibfduqhfmgypbffe", //授权码
+		IsUseSsl:true,
+	})
+	//SendMail("892423867@qq.com","测试邮件",[]byte("邮件内容..."))
+	//SendMail(&MailContent{
+	//	ToMail:"892423867@qq.com",
+	//	Subject:"测试邮件",
+	//	Body:[]byte("邮件内容..."),
+	//})
+}