JavaMail实现发送邮件，可添加附件（JAVA SWING）

到这里来下载这个软件吧   http://home.ustc.edu.cn/~cwtree/

共有4个文件，其中Authenticator是完成你的邮箱的用户名密码验证的，但是这个验证要看你用的是哪一个邮件服务器，有的服务器需要验证，有的服务器不需要验证

你也可以不需要这个功能，设置mail.smtp.auth 为false就行了

代码展示

Mail.java

-------------------------

package cn.edu.ustc.mail;

import java.util.Properties;

public class Mail {

private String fromAddress;

private String toAddress;

private String subject;

private String content;

private String attach;

private String mailHost;

private String username;

private String password;

private boolean validate;

public String getFromAddress() {

return fromAddress;

}

public void setFromAddress(String fromAddress) {

this.fromAddress = fromAddress;

}

public String getToAddress() {

return toAddress;

}

public void setToAddress(String toAddress) {

this.toAddress = toAddress;

}

public String getSubject() {

return subject;

}

public void setSubject(String subject) {

this.subject = subject;

}

public String getContent() {

return content;

}

public void setContent(String content) {

this.content = content;

}

public String getAttach() {

return attach;

}

public void setAttach(String attach) {

this.attach = attach;

}

public String getMailHost() {

return mailHost;

}

public void setMailHost(String mailHost) {

this.mailHost = mailHost;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public boolean isValidate() {

return validate;

}

public void setValidate(boolean validate) {

this.validate = validate;

}

public Properties getProperties() {

Properties p = new Properties();

p.put("mail.smtp.host", mailHost);

p.put("mail.transport.protocol", "smtp");

p.put("mail.smtp.auth", validate?"true":"false");

return p;

}

}

---------------------------------

MailAuthenticator.java

---------------------------------

package cn.edu.ustc.mail;

import javax.mail.Authenticator;

import javax.mail.PasswordAuthentication;

public class MailAuthenticator extends Authenticator {

String username = null;

String password = null;

public MailAuthenticator(){}

public MailAuthenticator(String username,String password) {

this.username = username;

this.password = password;

}

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication(username, password);

}

}

---------------------------------

SendMail.java

---------------------------------

package cn.edu.ustc.mail;

import java.util.Properties;

import javax.activation.DataHandler;

import javax.activation.FileDataSource;

import javax.mail.Address;

import javax.mail.BodyPart;

import javax.mail.Message;

import javax.mail.Multipart;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeBodyPart;

import javax.mail.internet.MimeMessage;

import javax.mail.internet.MimeMultipart;

public class SendMail {

private static boolean flag = false;

public static boolean send(Mail mail) throws Exception{

//首先判断是否需要验证

//validate为true表明需要验证，但是是否真的验证了还要根据邮件服务器，有的服务器验证，有的不需要验证

MailAuthenticator authenticator = null;

Properties prop = mail.getProperties();

if(mail.isValidate()) {

authenticator = new MailAuthenticator(mail.getUsername(),mail.getPassword());

}

//根据属性和密码验证器生成一个邮件session

Session session = Session.getDefaultInstance(prop,authenticator);

try {

Message message = new MimeMessage(session);

Address from = new InternetAddress(mail.getFromAddress());

message.setFrom(from);

Address to = new InternetAddress(mail.getToAddress());

message.setRecipient(Message.RecipientType.TO, to);

message.setSubject(mail.getSubject());

Multipart mainPart = new MimeMultipart();//邮件的主体，让它装载所有邮件内容

BodyPart body = new MimeBodyPart();//邮件主体的子部分

//邮件正文内容

body.setContent(mail.getContent(),"text/html;charset=utf-8");

BodyPart attachbody = null;

if(null==mail.getAttach()||"".equals(mail.getAttach())) {

}else {

//开始处理邮件的附件

attachbody = new MimeBodyPart();

FileDataSource fds = new FileDataSource(mail.getAttach());

DataHandler dh = new DataHandler(fds);

//提取文件名

String attach = mail.getAttach();

String fileName = attach.substring(attach.lastIndexOf("\"));

attachbody.setFileName(new String(fileName.getBytes("GB2312")));

attachbody.setDataHandler(dh);

}

mainPart.addBodyPart(body);

mainPart.addBodyPart(attachbody);

message.setContent(mainPart);

Transport.send(message);

System.out.println("邮件发送成功\\(^o^)//~");

flag = true;

} catch (Exception e) {

System.out.println("邮件发送失败╮(╯▽╰)╭");

flag = false;

throw e;

}

return flag;

}

}

---------------------------------

MainFrame.java

---------------------------------

package cn.edu.ustc.mail;

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.GridLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import javax.swing.JButton;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

public class MainFrame {

private static JFrame frame = new JFrame("快速邮件发送");

private static FlowLayout fl = new FlowLayout(FlowLayout.LEFT);

private static JPanel panel1_umail = new JPanel(new BorderLayout());

private static JPanel panel2_tmail = new JPanel(new BorderLayout());

private static JPanel panel3_subject = new JPanel(new BorderLayout());

private static JPanel panel4_content = new JPanel(new BorderLayout());

private static JPanel panel5_attach = new JPanel(new BorderLayout());

private static JPanel panel6_button = new JPanel(new GridLayout(1, 2));//装载两个按钮

private static JLabel label1_umail = new JLabel("你的邮箱：");

private static JLabel label2_tmail = new JLabel("TA的邮箱：");

private static JLabel label3_subject = new JLabel("邮件主题：");

private static JLabel label4_content = new JLabel("邮件内容：");

private static JLabel label5_attach = new JLabel("添加附件：");

private static JTextField text1_umail = new JTextField(30);

private static JTextField text2_tmail = new JTextField(30);

private static JTextField text3_subject = new JTextField(30);

private static JTextArea area_content = new JTextArea(10, 30);

private static JScrollPane scroll_content = new JScrollPane(area_content);

// 附件留空

private static JFileChooser attach = new JFileChooser();

private static JButton button_attach = new JButton("导入文件");

private static JTextField text_attach = new JTextField(30);

private static JButton button_send = new JButton("发送邮件");

private static JButton button_clear = new JButton("清空重写");

private static int width = 420;

private static int height = 350;

private static int x = (int) Toolkit.getDefaultToolkit().getScreenSize()

.getWidth()

/ 2 - width / 2;

private static int y = (int) Toolkit.getDefaultToolkit().getScreenSize()

.getHeight()

/ 2 - height / 2;

private static JOptionPane pane = new JOptionPane();

@SuppressWarnings("static-access")

private static void show() {

frame.setLayout(fl);

// 添加第一行，你的邮箱

panel1_umail.add(label1_umail, BorderLayout.WEST);

panel1_umail.add(text1_umail, BorderLayout.EAST);

frame.add(panel1_umail);

// 添加第二行，TA的邮箱

panel2_tmail.add(label2_tmail, BorderLayout.WEST);

panel2_tmail.add(text2_tmail, BorderLayout.EAST);

frame.add(panel2_tmail);

// 添加第三行，主题

panel3_subject.add(label3_subject, BorderLayout.WEST);

panel3_subject.add(text3_subject, BorderLayout.EAST);

frame.add(panel3_subject);

// 添加第四行，内容

panel4_content.add(label4_content, BorderLayout.WEST);

scroll_content.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);

scroll_content.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

area_content.setLineWrap(true);

panel4_content.add(scroll_content, BorderLayout.EAST);

frame.add(panel4_content);

// 添加第五行，附件

panel5_attach.add(label5_attach, BorderLayout.WEST);

button_attach.setPreferredSize(new Dimension(300, 20));

panel5_attach.add(button_attach, BorderLayout.EAST);

frame.add(panel5_attach);

// 添加第六行，按钮

button_send.setPreferredSize(new Dimension(200,40));

button_clear.setPreferredSize(new Dimension(200, 40));

panel6_button.add(button_send);

panel6_button.add(button_clear);

frame.add(panel6_button);

pane.showMessageDialog(null, "此程序无需您的邮箱验证，但请您使用您自己常用的邮箱发邮件！");

// 导入附件

button_attach.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

File file = null;

int state = attach.showOpenDialog(null);

file = attach.getSelectedFile();

text_attach.setText(null);

if (state == JFileChooser.APPROVE_OPTION && file != null) {

text_attach.setText(file.getAbsolutePath());

text_attach.setEditable(false);

panel5_attach.remove(button_attach);

panel5_attach.add(text_attach);

panel5_attach.setVisible(false);

panel5_attach.setVisible(true);

//attach.setVisible(false);

} else if (state == JFileChooser.CANCEL_OPTION) {

text_attach.setText(null);

}

}

});

// 清空按钮事件

button_clear.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

text1_umail.setText(null);

text2_tmail.setText(null);

text3_subject.setText(null);

area_content.setText(null);

text_attach.setText(null);

panel5_attach.remove(text_attach);

panel5_attach.add(button_attach);

panel5_attach.setVisible(false);

panel5_attach.setVisible(true);

}

});

// 发送邮件

button_send.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

Mail mail = new Mail();

String umail = text1_umail.getText();

String tmail = text2_tmail.getText();

String subject = text3_subject.getText();

String content = area_content.getText();

String attach = text_attach.getText();

mail.setFromAddress(umail);

mail.setToAddress(tmail);

mail.setSubject(subject);

mail.setContent(content);

mail.setMailHost("这里设置成你将使用的邮件服务器");

mail.setValidate(false);

mail.setAttach(attach);

try {

SendMail.send(mail);

pane.showMessageDialog(null, "发送成功O(∩_∩)O！");

text1_umail.setText(null);

text2_tmail.setText(null);

text3_subject.setText(null);

area_content.setText(null);

text_attach.setText(null);

panel5_attach.remove(text_attach);

panel5_attach.add(button_attach);

panel5_attach.setVisible(false);

panel5_attach.setVisible(true);

} catch (Exception e1) {

pane.showMessageDialog(null, "发送失败╮(╯▽╰)╭!\n"+e1.getMessage());

e1.printStackTrace();

}

}

});

frame.setVisible(true);

frame.setLocation(x, y);

frame.setSize(width, height);

frame.setResizable(false);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

show();

}

}

---------------------------------

至此所有代码已经完成了，运行MainFrame.java即可。

Good Luck !