[ Java 代碼範本 ] 透過 Yahoo Mail account 使用 JavaMail 送信

Preface : 
最近需要寫一個 watch dog 來定時檢視我們提供的 service 是否還活著, 由於需要再 service break 發 mail 通知相關人等, 故拜了 Google 大神將實作細節整理在這. 
這邊使用 Yahoo SMTP/POP 作為 mail sending 的平台, 因此你需要有對應的 Yahoo Mail account; 另外使用的 Java 套件是 JavaMail, 你需要將它加到你專案的 classpath 中. 

Mail account 設定 : 
在開使撰寫代碼前, 先要設定你的 Mail Account. 請進入你的 Mail account 後, 在左上方按照下面指示進入設定頁面 : 
 

接著按照下面說明完成設定 : 
 

範例代碼 : 
接著我建立的一個類別 MailAgent 方便後續使用, 完整代碼如下 : 
- MailAgent.java : 

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1. package test;  
2.   
3. import java.util.LinkedList;  
4. import java.util.List;  
5. import java.util.Properties;  
6.   
7. import javax.mail.Authenticator;  
8. import javax.mail.Message;  
9. import javax.mail.PasswordAuthentication;  
10. import javax.mail.Session;  
11. import javax.mail.Store;  
12. import javax.mail.Transport;  
13. import javax.mail.internet.InternetAddress;  
14. import javax.mail.internet.MimeMessage;  
15.   
16. import org.apache.commons.codec.binary.Base64;  
17.   
18. public class MailAgent {  
19.     private String          username = "";  // Your account in Yahoo  
20.     private String          password = "";  // Your password of account in Yahoo  
21.     private String          smtpHost = "smtp.mail.yahoo.com";  
22.     private String          popHost = "pop.mail.yahoo.com";  
23.     private String          fromAddress = "";  
24.     private List  toAddressList = null;  
25.     private Properties      props = null;  
26.     public boolean          isDebug = false;  
27.   
28.     public MailAgent(){}  
29.     public MailAgent(String user,String pwd, String smtpHost, String popHost)  
30.     {  
31.         this.username = user;   
32.         this.password = pwd;  
33.         this.smtpHost = smtpHost;  
34.         this.popHost = popHost;  
35.     }  
36.       
37.     public void resetProp()  
38.     {  
39.         props = System.getProperties();       
40.         props.put("mail.smtp.host", smtpHost);  
41.         //props.put("mail.from",from);  
42.         props.put("mail.smtp.starttls.enable", "true");  
43.         props.put("mail.smtp.auth", "true");  
44.         props.put("mail.debug", String.valueOf(isDebug));  
45.     }  
46.       
47.     public String getUsername() {  
48.         return username;  
49.     }  
50.     public void setUsername(String username) {  
51.         this.username = username;  
52.     }  
53.     public String getPassword() {  
54.         return password;  
55.     }  
56.     public void setPassword(String password)   
57.     {  
58.         this.password = password;  
59.     }  
60.     public void setPasswordInBase64(String passwordInBase64)  
61.     {  
62.         Base64 base64 = new Base64();  
63.         this.password = new String(base64.decode(passwordInBase64.getBytes()));  
64.     }  
65.       
66.     public List getToAddressList() {  
67.         return toAddressList;  
68.     }  
69.     public void setToAddressList(List toAddressList) {  
70.         this.toAddressList = toAddressList;  
71.     }  
72.     public String getSmtpHost() {  
73.         return smtpHost;  
74.     }  
75.     public void setSmtpHost(String smtpHost) {  
76.         this.smtpHost = smtpHost;  
77.     }  
78.     public String getPopHost() {  
79.         return popHost;  
80.     }  
81.     public void setPopHost(String popHost) {  
82.         this.popHost = popHost;  
83.     }  
84.       
85.     public String getFromAddress() {  
86.         return fromAddress;  
87.     }  
88.     public void setFromAddress(String fromAddress) {  
89.         this.fromAddress = fromAddress;  
90.     }  
91.     public boolean isDebug() {  
92.         return isDebug;  
93.     }  
94.     public void setDebug(boolean isDebug) {  
95.         this.isDebug = isDebug;  
96.     }  
97.     public boolean sendMail(List toAddressList, String subject, String body)  
98.     {  
99.         try  
100.         {  
101.             if(props==null) resetProp();  
102.             // Get session  
103.             Session session = Session.getDefaultInstance(props, new Authenticator() {  
104.                 @Override  
105.                 protected PasswordAuthentication getPasswordAuthentication() {  
106.                     return new PasswordAuthentication(username, password);  
107.                 }  
108.             });  
109.             session.setDebug(isDebug);  
110.             // Pop Authenticate yourself  
111.             Store store = session.getStore("pop3");  
112.             store.connect(popHost, username, password);  
113.               
114.             MimeMessage message = new MimeMessage(session);  
115.             message.setFrom(new InternetAddress(fromAddress));  
116.             message.setSubject(subject);  
117.             message.setText(body);        
118.             for(String to:toAddressList)  
119.             {                                 
120.                 message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));                                         
121.             }     
122.             // Send message  
123.             Transport.send(message);  
124.             return true;  
125.         }  
126.         catch(Exception e)  
127.         {  
128.             e.printStackTrace();  
129.         }  
130.         return false;  
131.     }  
132.       
133.     public boolean sendMail(String toAddress, String subject, String body)  
134.     {  
135.         List toAddressList = new LinkedList();  
136.         toAddressList.add(toAddress);  
137.         return this.sendMail(toAddressList, subject, body);  
138.     }  
139.       
140.     public boolean sendMail(String subject, String body)  
141.     {  
142.         if(toAddressList==null || fromAddress==null || fromAddress.trim().isEmpty()) return false;  
143.         else  
144.         {  
145.             return sendMail(toAddressList, subject, body);  
146.         }  
147.     }  
148. }  

接著你只要創建這個類別的物件, 設定你的 account 訊息與使用的 mail address (From address of mail), 便可以透過 API sendMail() 發送郵件. 簡單使用範例如下 : 

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1. public static void main(String[] args) {  
2.     MailAgent mailAgent = new MailAgent();  
3.     mailAgent.setUsername("your yahoo account");  
4.     mailAgent.setPassword("password of your account");  
5.     mailAgent.setFromAddress("from address of your mail");  
6.     List toAddressList = new LinkedList();  
7.     toAddressList.add("johnlee@ntnu.edu.tw"); // Add to-address1 of mail  
8.     toAddressList.add("puremonkey2007@gmail.com"); // Add to-address2 of mail  
9.     mailAgent.sendMail(toAddressList, "Hello Test", "This is for testing");  
10. }  

接著去你發送的信箱應該就可以看到上面代碼發送的測試 mail, 下面是我的 gmail 信箱收到的結果 : 
 

Supplement : 
* How do I use the Yahoo SMTP server to send mail with the JavaMail API? 
* TLS issue when sending to gmail through JavaMail