Question

我对Java Mail完全不熟悉。我首先想要执行程序（我通过我的老年人），看看是否一切正常。因此，当我编译该代码时，我发现错误的所有类和Java邮件包都找不到。
任何人都可以列出我需要的程序，我的程序编译和执行没有任何问题。我下载了“JAva Mail 1.4.5”但是没有安装文件？
我有JAva 1.6和Windows XP
请帮助........
错误：
C:>javac SMTPClient.java SMTPClient.java:2: package javax.mail does not exist import javax.mail.; ^ SMTPClient.java:3: package javax.mail.internet does not exist import javax.mail.internet.; ^ SMTPClient.java:18: cannot find symbol symbol : class Session location: class SMTPClient Session session = Session.getDefaultInstance(properties); ^ SMTPClient.java:18: cannot find symbol symbol : variable Session location: class SMTPClient Session session = Session.getDefaultInstance(properties); ^ SMTPClient.java:21: cannot find symbol symbol : class MimeMessage location: class SMTPClient MimeMessage message = new MimeMessage(session); ^ SMTPClient.java:21: cannot find symbol symbol : class MimeMessage location: class SMTPClient MimeMessage message = new MimeMessage(session); ^ SMTPClient.java:25: cannot find symbol symbol : class InternetAddress location: class SMTPClient message.setFrom(new InternetAddress(from)); ^ SMTPClient.java:28: package Message does not exist message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));



                                ^


SMTPClient.java:28: cannot find symbol
symbol  : class InternetAddress
location: class SMTPClient
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

                                                       ^


SMTPClient.java:40: cannot find symbol
symbol  : class Transport
location: class SMTPClient
Transport t = session.getTransport("smtps");
^
10 errors

C:>

Answer 1

下载java mail.jar和security.jar

1.将以下代码复制到记事本并保存为EmailAgent.java（相应地更改电子邮件地址和密码）



 import java.security.Security;
 import java.util.Properties;
 import javax.mail.Message;
 import javax.mail.MessagingException;
 import javax.mail.PasswordAuthentication;
 import javax.mail.Session;
 import javax.mail.Transport;
 import javax.mail.internet.InternetAddress;
 import javax.mail.internet.MimeMessage;

 public class EmailAgent {


private static final String SMTP_HOST_NAME = "smtp.gmail.com";
private static final String SMTP_PORT = "465";
private static final String emailMsgTxt = "Test Message Contents";
private static final String emailSubjectTxt = "A test from gmail";
private static final String emailFromAddress = "abcd@gmail.com";
private static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
private static final String[] sendTo = { "xyz@gmail.com" };

public static void main(String args[]) throws Exception {

    Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

    new EmailAgent().sendSSLMessage(sendTo, emailSubjectTxt, emailMsgTxt,
            emailFromAddress);
    System.out.println("Sucessfully Sent mail to All Users");
}

public void sendSSLMessage(String recipients[], String subject,
        String message, String from) throws MessagingException {
    boolean debug = true;

    Properties props = new Properties();
    props.put("mail.smtp.host", SMTP_HOST_NAME);
    props.put("mail.smtp.auth", "true");
    props.put("mail.debug", "true");
    props.put("mail.smtp.port", SMTP_PORT);
    props.put("mail.smtp.socketFactory.port", SMTP_PORT);
    props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
    props.put("mail.smtp.socketFactory.fallback", "false");

    Session session = Session.getDefaultInstance(props,
            new javax.mail.Authenticator() 
             {
                 protected PasswordAuthentication                   

              getPasswordAuthentication() {
                    return new   
                 PasswordAuthentication("abcd@gmail.com", "password");
                }
            });

    session.setDebug(debug);

    Message msg = new MimeMessage(session);
    InternetAddress addressFrom = new InternetAddress(from);
    msg.setFrom(addressFrom);

    InternetAddress[] addressTo = new InternetAddress[recipients.length];
    for (int i = 0; i < recipients.length; i++) {
        addressTo[i] = new InternetAddress(recipients[i]);
    }
    msg.setRecipients(Message.RecipientType.TO, addressTo);

    // Setting the Subject and Content Type
    msg.setSubject(subject);
    msg.setContent(message, "text/plain");
    Transport.send(msg);
   }
  }

转到“运行”，键入cmd并按Enter键
导航到保存EmailAgent.java文件的路径。
将mail.jar和security.jar复制到保存EmailAgent.java的同一目录
编译java文件

javac -cp .; mail.jar; security.jar EmailAgent.java
运行已编译的java类

java -cp .; mail.jar; security.jar EmailAgent

并检查您的sendTo电子邮件地址收件箱。宾果：）

Answer 2

如果Java抱怨没有找到包，那么你的类路径上可能没有那些特定的包。

Java库通常位于.jar文件中。您需要将此.jar文件加载到类路径中。将jar文件放入类路径就像将其复制到类路径所指向的文件夹一样简单。您也可以将它们添加到项目中。简而言之，您无法像Windows库一样安装它。没有更多细节，我无法真正提供答案。您应该发布一些您收到的错误消息以及您正在使用的IDE。

SMTP客户端Java程序

2 个答案: