socket实现邮件发送(一)

[java]
通过java的网络编程特性，完成邮件发送的功能，效果图如下：

首先新建一个maiTest的java项目，

然后新建GBC.java和MailTest.java文件

GBC.java代码如下：

[java]
package ch02; www.2cto.com

import java.awt.*;


public class GBC extends GridBagConstraints
{

public GBC(int gridx, int gridy)
{
this.gridx = gridx;
this.gridy = gridy;
}


public GBC(int gridx, int gridy, int gridwidth, int gridheight)
{
this.gridx = gridx;
this.gridy = gridy;
this.gridwidth = gridwidth;
this.gridheight = gridheight;
}


public GBC setAnchor(int anchor)
{
this.anchor = anchor;
return this;
}


public GBC setFill(int fill)
{
this.fill = fill;
return this;
}


public GBC setWeight(double weightx, double weighty)
{
this.weightx = weightx;
this.weighty = weighty;
return this;
}


public GBC setInsets(int distance)
{
this.insets = new Insets(distance, distance, distance, distance);
return this;
}


public GBC setInsets(int top, int left, int bottom, int right)
{
this.insets = new Insets(top, left, bottom, right);
return this;
}


public GBC setIpad(int ipadx, int ipady)
{
this.ipadx = ipadx;
this.ipady = ipady;
return this;
}
}

MailTest.java的代码如下：
[java]
package ch02;

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.net.*;
import java.io.*;
import javax.swing.*;


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);
}
});
}
}


class MailTestFrame extends JFrame
{
public MailTestFrame()
{
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
setTitle("MailTest");

setLayout(new GridBagLayout());

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

from = new JTextField(20);
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);
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);
add(smtpServer, new GBC(1, 2).setFill(GBC.HORIZONTAL).setWeight(100, 0));

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

comm = new JTextArea();
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("Send");
buttonPanel.add(sendButton);
sendButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
// new SwingWorker()
// {
// protected Void doInBackground() throws Exception
// {
//