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/// <summary>
/// smtp回应代码哈希表
/// </summary>
private void smtpcodeadd()
{
errcodeht.add("500","邮箱地址错误");
errcodeht.add("501","参数格式错误");
errcodeht.add("502","命令不可实现");
errcodeht.add("503","服务器需要smtp验证");
errcodeht.add("504","命令参数不可实现");
errcodeht.add("421","服务未就绪，关闭传输信道");
errcodeht.add("450","要求的邮件操作未完成，邮箱不可用（例如，邮箱忙）");
errcodeht.add("550","要求的邮件操作未完成，邮箱不可用（例如，邮箱未找到，或不可访问）");
errcodeht.add("451","放弃要求的操作；处理过程中出错");
errcodeht.add("551","用户非本地，请尝试<forward-path>");
errcodeht.add("452","系统存储不足，要求的操作未执行");
errcodeht.add("552","过量的存储分配，要求的操作未执行");
errcodeht.add("553","邮箱名不可用，要求的操作未执行（例如邮箱格式错误）");
errcodeht.add("432","需要一个密码转换");
errcodeht.add("534","认证机制过于简单");
errcodeht.add("538","当前请求的认证机制需要加密");
errcodeht.add("454","临时认证失败");
errcodeht.add("530","需要认证");
rightcodeht.add("220","服务就绪");
rightcodeht.add("250","要求的邮件操作完成");
rightcodeht.add("251","用户非本地，将转发向<forward-path>");
rightcodeht.add("354","开始邮件输入，以<enter>.<enter>结束");
rightcodeht.add("221","服务关闭传输信道");
rightcodeht.add("334","服务器响应验证base64字符串");
rightcodeht.add("235","验证成功");
}
/// <summary>
/// 将字符串编码为base64字符串
/// </summary>
/// <param name="estr">要编码的字符串</param>
private string base64encode(string str)
{
byte[] barray;
barray=encoding.default.getbytes(str);
return convert.tobase64string(barray);
}
/// <summary>
/// 将base64字符串解码为普通字符串
/// </summary>
/// <param name="dstr">要解码的字符串</param>
private string base64decode(string str)
{
byte[] barray;
barray=convert.frombase64string(str);
return encoding.default.getstring(barray);
}
/// <summary>
/// 得到上传附件的文件流
/// </summary>
/// <param name="filepath">附件的绝对路径</param>
private string getstream(string filepath)
{
//建立文件流对象
system.io.filestream filestr=new system.io.filestream(filepath,system.io.filemode.open);
byte[] by=new byte[system.convert.toint32(filestr.length)];
filestr.read(by,0,by.length);
filestr.close();
return(system.convert.tobase64string(by));
}
/// <summary>
/// 发送smtp命令
/// </summary>
private bool sendcommand(string str)
{
byte[] writebuffer;
if(str==null||str.trim()=="")
{
return true;
}
logs+=str;
logs+=(enter+enter);
htmllog+="<font color=blue>";
htmllog+=str;
htmllog+="</font></br>";
writebuffer = encoding.default.getbytes(str);
try
{
ns.write(writebuffer,0,writebuffer.length);
}
catch
{
errmsg="网络连接错误";
return false;
}
return true;
}
/// <summary>
/// 接收smtp服务器回应
/// </summary>
private string recvresponse()
{
int streamsize;
string returnvalue = "";
byte[] readbuffer = new byte[1024] ;
try
{
streamsize=ns.read(readbuffer,0,readbuffer.length);
}
catch
{
errmsg="网络连接错误";
return "false";
}
if (streamsize==0)
{
return returnvalue ;
}
else
{
returnvalue = encoding.default.getstring(readbuffer).substring(0,streamsize);
logs+=returnvalue + enter + enter;
htmllog+="<font color=#990000>";
htmllog+=returnvalue;
htmllog+="</font></br>";
return returnvalue;
}
}
/// <summary>
/// 与服务器交互，发送一条命令并接收回应。
/// </summary>
/// <param name="command">一个要发送的命令</param>
/// <param name="errstr">如果错误，要反馈的信息</param>
private bool dialog(string str,string errstr)
{
if(str==null||str.trim()=="")
{
return true;
}
if(sendcommand(str))
{
string rr=recvresponse();
if(rr=="false")
{
return false;
}
string rrcode=rr.substring(0,3);
if(rightcodeht[rrcode]!=null)
{
return true;
}
else
{
if(errcodeht[rrcode]!=null)
{
errmsg+=(rrcode+errcodeht[rrcode].tostring());
errmsg+=enter;
}
else
{
errmsg+=rr;
}
errmsg+=errstr;
return false;
}
}
else
{
return false;
}
}
/// <summary>
/// 与服务器交互，发送一组命令并接收回应。
/// </summary>
private bool dialog(string[] str,string errstr)
{
for(int i=0;i<str.length;i++)
{
if(!dialog(str[i],""))
{
errmsg+=enter;
errmsg+=errstr;
return false;
}
}
return true;
}
//发送邮件
private bool sendemail()
{
//连接网络
try
{
tc=new tcpclient(mailserver,mailserverport);
}
catch(exception e)
{
errmsg=e.tostring();
return false;
}
ns = tc.getstream();
smtpcodeadd();
//验证网络连接是否正确
if(rightcodeht[recvresponse().substring(0,3)]==null)
{
errmsg="网络连接失败";
return false;
}
string[] sendbuffer;
string sendbufferstr;
//进行smtp验证
if(esmtp)
{
sendbuffer=new string[4];
sendbuffer[0]="ehlo " + mailserver + enter;
sendbuffer[1]="auth login" + enter;
sendbuffer[2]=base64encode(username) + enter;
sendbuffer[3]=base64encode(password) + enter;
if(!dialog(sendbuffer,"smtp服务器验证失败，请核对用户名和密码。"))
return false;
}
else
{
sendbufferstr="helo " + mailserver + enter;
if(!dialog(sendbufferstr,""))
return false;
}
//
sendbufferstr="mail from:<" + from + ">" + enter;
if(!dialog(sendbufferstr,"发件人地址错误，或不能为空"))
return false;
//
sendbuffer=new string[recipientmaxnum];
for(int i=0;i<recipient.count;i++)
{
sendbuffer[i]="rcpt to:<" + recipient[i].tostring() +">" + enter;
}
if(!dialog(sendbuffer,"收件人地址有误"))
return false;
sendbufferstr="data" + enter;
if(!dialog(sendbufferstr,""))
return false;
sendbufferstr="from:" + fromname + "<" + from +">" +enter;
sendbufferstr += "to:=?"+charset.toupper()+"?b?"+base64encode(recipientname)+"?="+"<"+recipient[0]+">"+enter;
sendbufferstr+="cc:";
for(int i=0;i<recipient.count;i++)
{
sendbufferstr+=recipient[i].tostring() + "<" + recipient[i].tostring() +">,";
}
sendbufferstr+=enter;
if(charset=="")
{
sendbufferstr+="subject:" + subject + enter;
}
else
{
sendbufferstr+="subject:" + "=?" + charset.toupper() + "?b?" + base64encode(subject) +"?=" +enter;
}
sendbufferstr+="x-priority:" + priority + enter;
sendbufferstr+="x-msmail-priority:" + priority + enter;
sendbufferstr+="importance:" + priority + enter;
sendbufferstr+="x-mailer: huolx.pubclass" + enter;
sendbufferstr+="mime-version: 1.0" + enter;
sendbufferstr += "content-type: multipart/mixed;"+enter;//内容格式和分隔符
sendbufferstr += " boundary=\"—-=_nextpart_000_00d6_01c29593.aab31770\""+enter;
sendbufferstr += "——=_nextpart_000_00d6_01c29593.aab31770"+enter;
if(html)
{
sendbufferstr+="content-type: text/html;" + enter;
}
else
{
sendbufferstr+="content-type: text/plain;" + enter;
}
if(charset=="")
{
sendbufferstr+=" charset=\"iso-8859-1\"" + enter;
}
else
{
sendbufferstr+=" charset=\"" + charset.tolower() + "\"" + enter;
}
//sendbufferstr += "content-transfer-encoding: base64"+enter;
sendbufferstr+="content-transfer-encoding: base64" + enter + enter;
sendbufferstr+= base64encode(body) + enter;
if(attachments.count!=0)
{
foreach(string filepath in attachments)
{
sendbufferstr += "——=_nextpart_000_00d6_01c29593.aab31770"+enter;
sendbufferstr += "content-type: application/octet-stream"+enter;
sendbufferstr += " name=\"=?"+charset.toupper()+"?b?"+base64encode(filepath.substring(filepath.lastindexof("\\")+1))+"?=\""+enter;
sendbufferstr += "content-transfer-encoding: base64"+enter;
sendbufferstr += "content-disposition: attachment;"+enter;
sendbufferstr += " filename=\"=?"+charset.toupper()+"?b?"+base64encode(filepath.substring(filepath.lastindexof("\\")+1))+"?=\""+enter+enter;
sendbufferstr += getstream(filepath)+enter+enter;
}
}
sendbufferstr += "——=_nextpart_000_00d6_01c29593.aab31770–"+enter+enter;
sendbufferstr += enter + "." + enter;
if(!dialog(sendbufferstr,"错误信件信息"))
return false;
sendbufferstr="quit" + enter;
if(!dialog(sendbufferstr,"断开连接时错误"))
return false;
ns.close();
tc.close();
return true;
}
}
}
