java編寫簡略的E-mail發送端法式。本站提示廣大學習愛好者:(java編寫簡略的E-mail發送端法式)文章只能為提供參考,不一定能成為您想要的結果。以下是java編寫簡略的E-mail發送端法式正文
本文實例引見了簡略E-mail發送端法式的Java完成代碼,分享給年夜家供年夜家參考,詳細內容以下
在這個代碼中,有幾個留意點強調一下:
1、應用 Socket 與 SMTP 郵件辦事器獲得銜接,留意 SMTP 辦事器的主機名;
2、應用 data 敕令時,若寫了 subject (主題)以後,郵件的注釋部門必需與 subject 之間有一個空行,即“回車+換行”,在代碼中則是 \r\n ;
3、異樣須要將發件人的郵箱用戶名、暗碼停止 BASE64 編碼以後再傳給 SMTP 辦事器;
4、法式在編譯時依然存在正告,這是因為 sun.misc.BASE64Encoder 類是存在於 rt.jar 包中的,因為 JDK 會更新進級,能夠會招致該包中的某些類產生變更而弗成用,所以編譯器會收回正告。
另外,寫了這些代碼,也發明了一些成績:
1、smtp.qq.com 和 smtp.sina.com 郵件辦事器不曉得為何不克不及用,也就是說,當發件人的郵箱地址是 qq 或許 sina 時,這個法式不論用了,狀況應對碼也看不懂。在我的測試傍邊,只要 smtp.163.com 可以用,明明都是在官網查到這幾個 SMTP 辦事器的,怎樣不克不及用呢?真奇異。有哪位同伙曉得的願望能告知我,感謝!
2、鄙人面的 SimpleMailSender 類中的 sendEmail() 辦法中,有些反復代碼讓人覺得困惑,然則沒方法,我臨時還弄不懂…
3、嚴重發明:QQ 郵箱吸收郵件的速度比 163 郵箱、sina 郵箱要快上能夠稀有十倍,真讓我驚奇。另外,應用 nslookup 敕令查詢 smtp.qq.com 的主機名時,發明它有很多多少台 SMTP 辦事器,至多比 163 的 3 台多出 5 台,騰訊真夠壯大;
4、固然說寫了這個法式可以歹意地一直給某個郵箱發郵件,然則我發明,當我用一個 sina 郵箱持續發送了幾十封郵件給固定的另外一個郵箱以後,該 sina 郵箱再想發郵件就會被謝絕,當心喲。
代碼以下:
// 郵件
class E_Mail {
String from;
String to;
String subject;
String content;
String userName;
String pwd;
public E_Mail(String from, String to, String subject,
String content, String userName, String pwd) {
this.from = from;
this.to = to;
this.subject = subject;
this.content = content;
this.userName = this.toBASE64(userName);
this.pwd = this.toBASE64(pwd);
}
/**
* 在 E_Mail 類中停止用戶名、暗碼的轉碼任務
*/
private String toBASE64(String str) {
return (new sun.misc.BASE64Encoder().encode(str.getBytes()));
}
}
// 簡略的郵件發送端類,完成發送功效
public class SimpleMailSender {
private String smtpServer;
private int port = 25;
private Socket socket;
BufferedReader br;
PrintWriter pw;
/**
* 依據發件人的郵箱地址肯定SMTP郵件辦事器
*/
private void initServer(String from) {
if(from.contains("@163")) {
this.smtpServer = "smtp.163.com";
}else if(from.contains("@126")) {
this.smtpServer = "smtp.126.com";
}else if(from.contains("@sina")) {
this.smtpServer = "smtp.sina.com";
}else if(from.contains("@qq")) {
this.smtpServer = "smtp.qq.com";
}
}
public void sendEmail(E_Mail email) {
try {
this.initServer(email.from);
this.socket = new Socket(smtpServer, port);
this.br = this.getReader(socket);
this.pw = this.getWriter(socket);
// 開端組裝發送郵件的敕令序列
send_Receive(null); // 吸收銜接SMTP辦事器勝利的信息
send_Receive("ehlo hao");
send_Receive("auth login");
send_Receive(email.userName);
send_Receive(email.pwd);
send_Receive("mail from:<" + email.from + ">");
send_Receive("rcpt to:<" + email.to + ">");
send_Receive("data");
// 郵件內容
pw.println("from:" + email.from);
pw.println("to:" + email.to);
// 主題與注釋之間必定要空一行,即加上"\r\n"
pw.println("subject:" + email.subject + "\r\n");
// 在掌握台打印郵件內容
System.out.println("from:" + email.from);
System.out.println("to:" + email.to);
System.out.println("subject:" + email.subject + "\r\n");
System.out.println(email.content);
// 郵件注釋
pw.println(email.content);
// 必定記得注釋以"."停止
send_Receive(".");
send_Receive("quit");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (socket != null)
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 每發送一條敕令,必需在敕令前面加上"\r\n",
* 則同時打印出smtp郵件辦事器的響應狀況碼
* @param command
*/
private void send_Receive(String command) throws IOException{
if(command != null) {
// 向SMTP郵件辦事器發送死令,必定要記得加上"\r\n"
pw.print(command + "\r\n");
pw.flush();
System.out.println("用戶 >> " + command);
}
char [] response = new char[1024];
br.read(response);
System.out.println(response);
}
/**
* 獲得 Socket 的輸入流
*/
private PrintWriter getWriter(Socket socket) throws IOException {
OutputStream socketOut = socket.getOutputStream();
return new PrintWriter(socketOut, true);
}
/**
* 獲得 Socket 的輸出流
*/
private BufferedReader getReader(Socket socket) throws IOException {
InputStream socketIn = socket.getInputStream();
return new BufferedReader(new InputStreamReader(socketIn));
}
// 測試
public static void main(String[] args) {
new MailSenderGUI();
}
}
// 郵件發送法式界面
class MailSenderGUI extends JFrame implements ActionListener {
private JLabel userNameLabel;
private JTextField userNameField;
private JLabel pwdLabel;
private JPasswordField pwdField;
private JLabel fromLabel;
private JTextField fromField;
private JLabel toLabel;
private JTextField toField;
private JLabel subjectLabel;
private JTextField subjectField;
private JLabel contentLabel;
private JTextArea contentArea;
private JButton sendBtn;
private JButton cancelBtn;
private E_Mail email;
private SimpleMailSender mailSender;
public MailSenderGUI() {
this.init();
this.mailSender = new SimpleMailSender();
}
private void init() {
this.fromLabel = new JLabel("發件人郵箱地址:");
this.fromField = new JTextField(25);
this.userNameLabel = new JLabel("用戶名:");
this.userNameField = new JTextField(25);
this.pwdLabel = new JLabel("暗碼:");
this.pwdField = new JPasswordField(25);
this.toLabel = new JLabel("收件人郵箱地址:");
this.toField = new JTextField(25);
this.subjectLabel = new JLabel("郵件主題:");
this.subjectField = new JTextField(20);
this.contentLabel = new JLabel("郵件注釋:");
this.contentArea = new JTextArea(15, 20);
this.setTitle("螞蟻-->簡略郵件發送器");
this.setBounds(200, 30, 500, 500);
this.setLayout(new BorderLayout());
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.sendBtn = new JButton("發送");
this.cancelBtn = new JButton("重置");
this.sendBtn.addActionListener(this);
this.cancelBtn.addActionListener(this);
JPanel upPanel = new JPanel(new GridLayout(6, 2, 5, 5));
upPanel.add(fromLabel);
upPanel.add(fromField);
upPanel.add(userNameLabel);
upPanel.add(userNameField);
upPanel.add(pwdLabel);
upPanel.add(pwdField);
upPanel.add(toLabel);
upPanel.add(toField);
upPanel.add(subjectLabel);
upPanel.add(subjectField);
upPanel.add(contentLabel);
this.add(upPanel, BorderLayout.NORTH);
this.add(contentArea, BorderLayout.CENTER);
JPanel downPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
downPanel.add(sendBtn, BorderLayout.SOUTH);
downPanel.add(cancelBtn, BorderLayout.SOUTH);
this.add(downPanel, BorderLayout.SOUTH);
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == this.sendBtn) {
this.email = new E_Mail(
this.fromField.getText(),
this.toField.getText(),
this.subjectField.getText(),
this.contentArea.getText(),
this.userNameField.getText(),
new String(this.pwdField.getPassword())
);
this.mailSender.sendEmail(this.email);
} else if (e.getSource() == this.cancelBtn) {
this.fromField.setText(null);
this.toField.setText(null);
this.subjectField.setText(null);
this.contentArea.setText(null);
}
}
}
以上就是java編寫簡略E-mail發送端法式的全體代碼,願望對年夜家的進修有所贊助。