package org.hvp.test;
import java.util.Hashtable;
import javax.naming.NamingException;
import javax.naming.directory.Attributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
/**
* @author "惠万鹏"
*
*/
public class Smtp
{
public static String getSmtpServer(String dns, String domain)
throws NamingException
{
/** 如果domain传入的是一个email */
if (domain.indexOf("@") > 0)
{
domain = domain.substring(domain.indexOf("@") + 1);
}
Hashtable<String, String> properties = new Hashtable<String, String>();
properties.put("java.naming.factory.initial","com.sun.jndi.dns.DnsContextFactory");
properties.put("java.naming.provider.url", "dns://" + dns);
DirContext ctx = new InitialDirContext(properties);
Attributes attributes = ctx.getAttributes(domain, new String[] { "MX" });
String recordMx = (String) attributes.get("MX").get();
if (recordMx != null)
{
recordMx = recordMx.substring(recordMx.indexOf(" ") + 1);
}
System.out.println("-------->" + recordMx + "<-------");
return recordMx;
}
public static void main(String[] args) throws NamingException
{
Smtp.getSmtpServer("10.1.3.210", "hwpok@163.com");
}
}
package org.hvp.test;
import java.net.*;
import java.io.*;
public class Test {
private static String END_FLAG = "\r\n";
public static void main(String[] args) throws Exception {
String mx = "163mx00.mxmail.netease.com";
InetAddress addr = InetAddress.getByName(mx);
Socket socket = new Socket(addr, 25);
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
// 连接成功后服务器会响应：
response(in);
// 首先发送HELO命令：
send("HELO www.javasprite.com" + END_FLAG, out);
response(in);
// 然后发送发件人地址：
send("MAIL FROM: someone@somewhere.com" + END_FLAG, out);
response(in);
// 设置收件人地址：
send("RCPT TO: hwpok@163.com" + END_FLAG, out);
response(in);
// 开始发送邮件正文：
send("DATA" + END_FLAG, out);
response(in);
send("From: someone@somewhere.com" + END_FLAG, out);
send("To: hwpok@163.com" + END_FLAG, out);
send("Subject: Test without smtp server" + END_FLAG, out);
send("Content-Type: text/plain;" + END_FLAG, out);
send(END_FLAG + END_FLAG, out);
// 发送邮件正文，如果用中文，需要BASE64编码：
send("text message body!" + END_FLAG, out);
// 每行以\r\n结束，不可过长，可拆成多行。
// 以"\r\n.\r\n"作为结束标志：
send(END_FLAG + "." + END_FLAG, out);
response(in);
// 结束并确认发送：
send("QUIT" + END_FLAG, out);
response(in);
in.close();
out.close();
socket.close();
}
public static void response(InputStream in) throws Exception {
byte[] buffer = new byte[102400];
int n = in.read(buffer);
if(n>0){
String s = new String(buffer, 0, n);
System.out.println(s);
}
}
public static void send(String s, OutputStream out) throws Exception {
byte[] buffer = s.getBytes();
if(buffer != null && buffer.length>0)
{
out.write(buffer);
out.flush();
}
}
}