当我在Java中实例化一个SimpleEmail类时，为什么会收到这个异常？ [英] Why am I getting this exception when I instantiate a SimpleEmail class in Java?

问题描述

我想做的就是用Java发送电子邮件。这是我发现的例子：

  import org.apache.commons.mail.SimpleEmail; 
 
 public class Email {
 
 public static void sendMessage（String emailaddress，String subject，String body）{
 try {
 SimpleEmail email = new SimpleEmail （）; 
 email.setHostName（valid ip address here）; 
 email.addTo（emailaddress）; 
 email.setFrom（[e-mail]，无回覆）; 
 email.setSubject（subject）; 
 email.setMsg（body）; 
 email.send（）; 
} catch（Exception ex）{
 ex.printStackTrace（）; 
} 
} 
} 
  

我立即得到以下异常在 SimpleEmail email = new SimpleEmail（）; 行：

  java我有一个JAR项目（使用Netbeans）：
  commons-email-1.2.jar  
 
 
 
我做错了什么
 
 
 
谢谢。
解决方案
不知道为什么SimpleEmail没有工作。但是这样做：
  import javax.mail。*; 
 import javax.mail.internet。*; 
 
 import java.util.Properties; 
 
 public class Email {
 
 public static void sendMessage（String emailaddress，String subject，String body）{
 try {
属性props = new Properties （）; 
 props.setProperty（mail.transport.protocol，smtp）; 
 props.setProperty（mail.host，myhost）; 
 
会话mailSession = Session.getDefaultInstance（道具，null）; 
运输transport = mailSession.getTransport（）; 
 
 MimeMessage message = new MimeMessage（mailSession）; 
 message.setSubject（测试javamail plain）; 
 message.setContent（这是一个测试，text / plain）; 
 message.addRecipient（Message.RecipientType.TO，new InternetAddress（[e-mail]））; 
 
 transport.connect（）; 
 transport.sendMessage（message，
 message.getRecipients（Message.RecipientType.TO））; 
 transport.close（）; 
} catch（Exception ex）{
 ex.printStackTrace（）; 
} 
} 
} 
  
感谢您的建议。 / p> 
All I want to do is send an email in Java.  Here is the example I found:
import org.apache.commons.mail.SimpleEmail;

public class Email {

    public static void sendMessage(String emailaddress, String subject, String body) {
        try {
            SimpleEmail email = new SimpleEmail();
            email.setHostName("valid ip address here");
            email.addTo(emailaddress);
            email.setFrom("[e-mail]", "No reply");
            email.setSubject(subject);
            email.setMsg(body);
            email.send();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}
I immediately get the following exception on the SimpleEmail email = new SimpleEmail(); line:
java.lang.ClassNotFoundException: org.apache.commons.mail.SimpleEmail
I have the following JAR in my project (using Netbeans):
commons-email-1.2.jar

What am I doing wrong?

Thanks.
解决方案
Not sure why SimpleEmail didn't work.  But this did:
import javax.mail.*;
  import javax.mail.internet.*;

  import java.util.Properties;

  public class Email {

     public static void sendMessage(String emailaddress, String subject, String body) {
        try {
           Properties props = new Properties();
           props.setProperty("mail.transport.protocol", "smtp");
           props.setProperty("mail.host", "myhost");

           Session mailSession = Session.getDefaultInstance(props, null);
           Transport transport = mailSession.getTransport();

           MimeMessage message = new MimeMessage(mailSession);
           message.setSubject("Testing javamail plain");
           message.setContent("This is a test", "text/plain");
           message.addRecipient(Message.RecipientType.TO, new InternetAddress("[e-mail]"));

           transport.connect();
           transport.sendMessage(message,
                   message.getRecipients(Message.RecipientType.TO));
           transport.close();
        } catch (Exception ex) {
           ex.printStackTrace();
        }
     }
  }
Thanks for the suggestions.

                        
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