尝试使用java类发送电子邮件时引发错误
嗨,我有一个类sendmail,它有一个方法sendmail。我有另一个jsp页面激活,在激活jsp页面中,我调用sendmail方法将电子邮件发送给特定的人。出于测试目的,我在sendEmail类中创建了一个mail方法,它工作时没有任何错误,但当我在jsp中使用它时,它显示错误。请帮助我 sendmail.java尝试使用java类发送电子邮件时引发错误,java,jsp,servlets,jakarta-mail,Java,Jsp,Servlets,Jakarta Mail,嗨,我有一个类sendmail,它有一个方法sendmail。我有另一个jsp页面激活,在激活jsp页面中,我调用sendmail方法将电子邮件发送给特定的人。出于测试目的,我在sendEmail类中创建了一个mail方法,它工作时没有任何错误,但当我在jsp中使用它时,它显示错误。请帮助我 sendmail.java package mail; import java.util.Properties; import javax.mail.Message; import javax.mail.
package mail;
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 SendEmail {
public void sendmail(String Email)
{
final String username = "from";
final String password = "x";
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.port", "587");
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("from"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(Email));
message.setSubject("Activatiozdfdfgen");
message.setText("Dear user ,"
+ "\n\n your username is xxx and pasword is yyy");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
public static void main(String s[])
{
SendEmail se=new SendEmail();
se.sendmail("to");
}
}
这是activation.jsp
<%@ page import="java.sql.*" %><%@ page import="DB.*" %>
<%@ page import="mail.*" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%!Connection con=null;
int uid;%>
<%DataBaseConnection db= new DataBaseConnection();
con=db.connet();
uid=Integer.parseInt(request.getParameter("hidden"));
try{
PreparedStatement pt=con.prepareStatement("update registration set status='activated' where UID="+uid);
pt.executeUpdate();
SendEmail se=new SendEmail();
se.sendmail(request.getParameter("email"));
}
catch(Exception e){out.println(e);} %>
<script type="text/javascript">
alert("activated");
</script>
<jsp:forward page="Admin.jsp"></jsp:forward>
</body>
</html>
原因是
MessaginException
不在web服务器的类路径中:
java.lang.NoClassDefFoundError: javax/mail/MessagingException
您需要将包含此类的jar添加到web服务器的类路径中。
搜索web以找到适合您的jar(可能是mail.jar)。您也可以对此进行检查。看起来您缺少一个jar…只要找到了
main()
方法,应用程序就会启动。直到后来,当它第一次尝试加载MessaginException
时,它才发现没有可供使用的jarthat@iluxa很抱歉我之前的评论。现在它成功了是的,你是对的,我错过了mail.jar,当我把它放在tomcat/lib中时,它成功了。非常感谢
java.lang.NoClassDefFoundError: javax/mail/MessagingException