同样的程序在jdk1.4 下可以编译运行 但jdk1.5下不能编译
public class Send
{
public static void main(String args[]) throws Exception
{
String host = "smtp.sohu.com";
String from = "aaa@sohu.com";
String to = "aaa@hotmail.com";
String username = "aaa";
String password = "1223456";
// Get system properties
// Properties props = System.getProperties();
Properties props = new Properties();
// Setup mail server
props.put("mail.smtp.host", host);
props.put("mail.smtp.auth", "true");
// Get session
Session session = Session.getDefaultInstance(props);
// watch the mail commands go by to the mail server
session.setDebug(true);
// Define message
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
message.setSubject("Hello JavaMail");
message.setText("Welcome to JavaMail");
// Send message
message.saveChanges();
Transport transport = session.getTransport("smtp");
transport.connect(host, username, password);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
}
抛出异常如下:
java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"