java 实现发送Email邮件

———-发送E-Mail：

发送电子邮件，必须建立一个到端口25的Socket链接，即SMTP端口；
SMTP是：简单邮件传输协议，用于描述电子邮件消息的格式；
可以链接到任何一个提供SMTP服务的服务器；
UNIX上，该服务通常是有sendmail守护进程实现的；
大多数服务器都内置检查功能，只接受信任的用户、域名或Ip的请求；
链接到服务器后，可以发送一个邮件报头（SMTP格式容易生成），后面就是邮件信息！
SMTP规范（RFC 821）：，每一行都要以\r再紧跟一个\n来结尾；

package com.corejava;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import java.net.*;

import java.io.*;

import javax.swing.*;

/*

This program shows hot to use sockets to send plain text mail messages.

@author Cay Horstmann

@version 1.11 2007-06-25

*/

public class MailTest

{

public static void main(String[] args)

{

EventQueue.invokeLater(new Runnable()

{

public void run()

{

JFrame frame = new MailTestFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

});

}

}

/*

The frame for the mail GUI.

*/

class MailTestFrame extends JFrame

{

public MailTestFrame()

{

setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

setTitle(“MailTest”);

setLayout(new GridBagLayout());

// we use the GBC convenience class of Core Java Volume 1 Chapter 9

add(new JLabel(“From:”), new GBC(0, 0).setFill(GBC.HORIZONTAL));

from = new JTextField(20); // 接收发信地址

add(from, new GBC(1, 0).setFill(GBC.HORIZONTAL).setWeight(100, 0));

add(new JLabel(“To:”), new GBC(0, 1).setFill(GBC.HORIZONTAL));

to = new JTextField(20); // 接收地址

add(to, new GBC(1, 1).setFill(GBC.HORIZONTAL).setWeight(100, 0));

add(new JLabel(“SMTP server:”), new GBC(0, 2).setFill(GBC.HORIZONTAL));

smtpServer = new JTextField(20); // 服务器地址

add(smtpServer, new GBC(1, 2).setFill(GBC.HORIZONTAL).setWeight(100, 0));

message = new JTextArea(); // 消息内容

add(new JScrollPane(message), new GBC(0, 3, 2, 1).setFill(GBC.BOTH).setWeight(100, 100));

comm = new JTextArea(); // 备注

add(new JScrollPane(comm), new GBC(0, 4, 2, 1).setFill(GBC.BOTH).setWeight(100, 100));

JPanel buttonPanel = new JPanel();

add(buttonPanel, new GBC(0, 5, 2, 1));

JButton sendButton = new JButton();

buttonPanel.add(sendButton);

sendButton.addActionListener(new ActionListener()

{

public void actionPerformed(ActionEvent event)

{

new SwingWorker()

{

protected Void doInBackground() throws Exception

{

comm.setText(“”);

sendMail();

return null;

}

}.execute();

}

});

}

/*

Sends the mail message thath has been authored in the GUI.

*/

public void sendMail()

{

try

{

Socket s = new Socket(smtpServer.getText(), 25);

InputStream inStream = s.getInputStream();

OutputStream outStream = s.getOutputStream();

in = new Scanner(inStream);

out = new PrintWriter(outStream, true /* autoFlush*/);

String hostName = InetAddress.getLocalHost().getHostName();

receive();

send(“HELLO ” + hostName);

receive();

send(“MAIL FROM: <" + from.getText() + ">“);

receive();

send(“RCPT TO: <" + to.getText() + ">“);

receive();

send(“DATA”);

receive();

send(message.getText());

send(“.”);

receive();

s.close();

}

catch (IOException e)

{

comm.append(“Error: ” + e);

}

}

/*

Sends a string to the socket and echoes it in the comm text area.

@param s the string to send.

*/

public void send(String s) throws IOException

{

comm.append(s);

comm.append(“\n”);

out.print(s.replaceAll(“\n”, “\r\n”));

out.print(“\r\n”);

out.flush();

}

/*

Receives a string from the socket and displays it in the comm text area.

*/

public void receive() throws IOException

{

String line = in.nextLine();

comm.append(line);

comm.append(“\n”);

}

private Scanner in;

private PrintWriter out;

private JTextField from;

private JTextField to;

private JTextField smtpServer;

private JTextArea message;

private JTextArea comm;

public static final int DEFAULT_WIDTH = 300;

public static final int DEFAULT_HEIGHT = 300;

}

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