Java程序在Windows 7上工作，但不是Windows 8？

Question

你們讓我很自覺......我會盡力讓這個更好。

好的，所以這個程序（不要殺我..我下載它）只能在Windows 7和Ubuntu上工作，據我所知。當你在Windows 8上打開它時，它會顯示「Java異常錯誤」。

我在想這個和文件末尾的catch(messagingException ex)有關。我承認，我對java一無所知，但你必須從某處開始......不是嗎？我知道java適用於所有平臺！

我也嘗試過這個程序有多個文件和多個Gmail帳戶......我甚至用我的康卡斯特電子郵件地址試了一下。
我使用「JavaMailAPI」（http://www.oracle.com/technetwork/java/javamail/index.html）作爲實際的郵件部分。

當我打開它在Windows 8終端它給了我這樣的：

Exception in thread "Main" java.lang.noclassdeffounderror: java/mail/mailexception 
at java.lang.Class.getDeclaredMethods0(Native Method) 
at java.langf.Class.privateGetDdecLaredMethods(Unkown source) 
at java.lang.Class.getMethod(unknown source) 
at sun.launcher.LauncherHelper.getMainMethod(Unknown source) 
caused by: java.lang.classnotfoundexception: java.mail.messagingException 
at java.net.URLCLassLoader$1.run(unknown source) 
at java.net.URLClassLoader$1.run(Unknown source) 
at java.security.AccessController.doPrivaleged(native Method) 
at java.net.URLClassLoader.findClass(Unknown source) 
at java.lang.ClassLoader.findClass(Unkown source) 
at jaa.lang.CLassLoader.loadClass(Unknown source) 
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown source) 
at java.lang.ClassLoader.loadClass(Unknown source) 
... 6 more 

下面是代碼：

package testing; 

import java.util.Properties; 
import javax.activation.DataHandler; 
import javax.activation.DataSource; 
import javax.activation.FileDataSource; 
import javax.mail.BodyPart; 
import javax.mail.Message; 
import javax.mail.MessagingException; 
import javax.mail.Multipart; 
import javax.mail.PasswordAuthentication; 
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; 
import java.util.logging.Level; 
import java.util.logging.Logger; 

public class Testing{ 
    public static void main(String[] args) { 
     Properties props = new Properties(); 
     props.put("mail.smtp.host", "smtp.gmail.com"); 
     props.put("mail.smtp.socketFactory.port", "465"); 
     props.put("mail.smtp.socketFactory.class", 
       "javax.net.ssl.SSLSocketFactory"); 
     props.put("mail.smtp.auth", "true"); 
     props.put("mail.smtp.port", "465"); 

     Session session = Session.getDefaultInstance(props, 
      new javax.mail.Authenticator() { 
       protected PasswordAuthentication getPasswordAuthentication() { 
        return new PasswordAuthentication("Email","Password"); 
       } 
      }); 

     try { 
         BodyPart messageBodyPart = new MimeBodyPart(); 
         Multipart multipart = new MimeMultipart(); 
      Message message = new MimeMessage(session); 
      message.setFrom(new InternetAddress("Email Address")); 
      message.setRecipients(Message.RecipientType.TO, 
        InternetAddress.parse("Email Address to send ")); 
      message.setSubject("Subject"); 
      message.setText("Message"); 
         String filename = "attachment location"; 
     DataSource source = new FileDataSource(filename); 
     message.setDataHandler(new DataHandler(source)); 
     message.setFileName(filename); 
     multipart.addBodyPart(messageBodyPart); 
      Transport.send(message); 
      System.out.println("Done"); 
       } catch (MessagingException ex) { 
       Logger.getLogger(Testing.class.getName()).log(Level.SEVERE, null, ex); 
      } 
     } 
} 

如果您需要任何其他有關程序請查詢！

Answer 1

You have to download Java Mail

如果通過該應用程序所需的JavaMail你應該建立一個安裝程序打包和安裝所需的JAR文件作爲JavaMail的。