upload.

.gitignore

+*.class
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HelloWorld.java

+public class HelloWorld {
+  public static void main(String[] args) {
+      System.out.println("Hello World");
+  }
+}
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README.md

 # java-demo
 
+邮件测试
+
+```java
+$ javac -cp "javax.mail.jar;" SendMail.java
+$ java -cp "javax.mail.jar;" SendMail
+```
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SendMailDemo.java

+import javax.mail.*;
+import javax.mail.internet.InternetAddress;
+import javax.mail.internet.MimeMessage;
+import java.util.Date;
+import java.util.Properties;
+
+public class SendMailDemo {
+
+  private static final String USERNAME = "leon.li@topibd.com";
+  private static final String PASSWORD = "xxx";
+
+  public static void main(String[] args) {
+    String mailFrom = "leon.li@topibd.com";
+    String mailTo = "114723704@qq.com";
+    String mailSubject = "Send Email Demo";
+    String mailText = "Send Email Demo Body";
+
+    SendMailDemo m = new SendMailDemo();
+    try {
+      m.sendMail(mailFrom, mailTo, mailSubject, mailText);
+    } catch (Exception ex) {
+      ex.printStackTrace();
+    }
+  }
+
+  private void sendMail(String mailFrom, String mailTo, String mailSubject, String mailText) throws Exception {
+
+    Properties config = createConfiguration();
+
+    Session session = Session.getInstance(config, new Authenticator() {
+      @Override
+      protected PasswordAuthentication getPasswordAuthentication() {
+        return new PasswordAuthentication(SendMailDemo.USERNAME, SendMailDemo.PASSWORD);
+      }
+    });
+
+    // Creates email message
+    Message message = new MimeMessage(session);
+    message.setSentDate(new Date());
+    message.setFrom(new InternetAddress(mailFrom));
+    message.setRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
+    message.setSubject(mailSubject);
+    message.setText(mailText);
+
+    // Send a message
+    Transport.send(message, SendMailDemo.USERNAME, SendMailDemo.PASSWORD);
+  }
+
+  private Properties createConfiguration() {
+    return new Properties() {
+      {
+        put("mail.smtp.auth", "true");
+        put("mail.smtp.host", "smtp.exmail.qq.com");
+        put("mail.smtp.port", "25");
+        // put("mail.smtp.starttls.enable", "false");
+      }
+    };
+  }
+}
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