java socket 实现SMTP协议 发送邮件

package com.socket.test;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;
import java.net.UnknownHostException;

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;

/**
* 通过socket向smtp协议服务器发送邮件
* @author fuyanqing
*
*/
public class SocketMail {
String mailServer;
String from;
String to;
String content;
String lineFeet = "\r\n";
private int port = 25;

Socket client;
BufferedReader in;
DataOutputStream os;

public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getMailServer() {
return mailServer;
}
public void setMailServer(String mailServer) {
this.mailServer = mailServer;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
public String getTo() {
return to;
}
public void setTo(String to) {
this.to = to;
}
/**
* 初始化连接
* @return
*/
private boolean init(){
boolean boo = true;
if(mailServer==null || "".equals(mailServer)){
return false;
}
try {
client = new Socket(mailServer,port);
in = new BufferedReader(new InputStreamReader(client.getInputStream()));
os = new DataOutputStream(client.getOutputStream());
String isConnect = response();
if(isConnect.startsWith("220")){

}else{
System.out.println("建立连接失败："+isConnect);
boo = false;
}
} catch (UnknownHostException e) {
System.out.println("建立连接失败！");
e.printStackTrace();
boo = false;
} catch (IOException e) {
System.out.println("读取流失败！");
e.printStackTrace();
boo = false;
}
return boo;
}
/**
* 发送smtp指令
* 并返回服务器响应信息
*/
private String sendCommand(String msg){
String result = null;
try {
os.writeBytes(msg);
os.flush();
result = response();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* 读取服务器端响应信息
* @return
*/
private String response(){
String result = null;
try {
result = in.readLine();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* 关闭
*/
private void close(){
try {
os.close();
in.close();
client.close();
} catch (IOException e) {
e.printStackTrace();
}

}
/**
* 发送邮件
* @return
*/
public boolean sendMail(){
//初始化
if(client==null){
if(init()){

}else{
return false;
}
}
//判断from,to
if(from==null || from.isEmpty() || to == null || to.isEmpty()){
return false;
}
//进行握手
String result = sendCommand("HELO "+mailServer+lineFeet);
if(isStartWith(result,"250")){
}else{
System.out.println("握手失败："+result);
return false;
}
//验证发信人信息
String auth = sendCommand("AUTH LOGIN"+lineFeet);
if(isStartWith(auth,"334")){
}else{
return false;
}
String user = sendCommand(new String(Base64.encode("*****".getBytes()))+lineFeet);
if(isStartWith(user,"334")){
}else{
return false;
}
String pass = sendCommand(new String(Base64.encode("*****".getBytes()))+lineFeet);
if(isStartWith(pass,"235")){
}else{
return false;
}


//发送指令
String f = sendCommand("Mail From:<"+from+">"+lineFeet);
if(isStartWith(f,"250")){
}else{
return false;
}
String toStr = sendCommand("RCPT TO:<"+to+">"+lineFeet);
if(isStartWith(toStr,"250")){
}else{
return false;
}

String data = sendCommand("DATA"+lineFeet);
if(isStartWith(data,"354")){
}else{
return false;
}

StringBuilder sb = new StringBuilder();
sb.append("From:<"+from+">"+lineFeet);
sb.append("To:<"+to+">"+lineFeet);
sb.append("Subject:test"+lineFeet);
sb.append("Date:2010/10/27 17:30"+lineFeet);
sb.append("Content-Type:text/plain;charset=\"GB2312\""+lineFeet);
sb.append(lineFeet);
sb.append(content);
sb.append(lineFeet+"."+lineFeet);

String conStr = sendCommand(sb.toString());
if(isStartWith(conStr,"250")){
}else{
return false;
}

//quit
String quit = sendCommand("QUIT"+lineFeet);
if(isStartWith(quit,"221")){
}else{
return false;
}
close();
return true;
}
private boolean isStartWith(String res,String with){
return res.startsWith(with);
}
public static void main(String[] args){
SocketMail mail = new SocketMail();
mail.setMailServer("smtp.163.com");
mail.setFrom("*****@163.com");
mail.setTo("*****@163.com");
mail.setContent("hello,this is a test mail!");
boolean boo = mail.sendMail();
if(boo)
System.out.println("邮件发送成功！");
else{
System.out.println("邮件发送失败！");
}
}
}

评论

4 楼 sp42 2015-08-10  

yuyaangel 写道

已经解决了。。。

我也不想用javamail包，你是怎么解决的？

3 楼 sp42 2015-08-10  

非常不错

2 楼 yuyaangel 2012-03-28  

已经解决了。。。

1 楼 yuyaangel 2012-03-26  

你有没有试过hotmail？hotmail开放了25和587端口，两者均要通过STARTTLS，就是先建立一个普通的Socket发一个helo，然后要转换为SSLSocket进行登录等后续操作。
我就是想问一下如何将普通的Socket转换为SSLSocket，这个问题纠结了我几天了，在网上查到了的一些思路是用SocketEngine和Channels，看了java的官方文档，还是不会用。
最好是要有代码的，我要的是用Socket写的，不是javamail包的。。。