嗨，我有一个 sendemail 类，它有一个 sendmail 方法。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 类中创建了一个邮件方法，它的工作没有任何错误，但是当我在 jsp 中使用它时，它显示错误。请帮助我
sendemail.java
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>
这是错误
type Exception report
message An exception occurred processing JSP page /Activate.jsp at line 21
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /Activate.jsp at line 21
18: try{
19: PreparedStatement pt=con.prepareStatement("update registration set status='activated' where UID="+uid);
20: pt.executeUpdate();
21: SendEmail se=new SendEmail();
22: se.sendmail(request.getParameter("email"));
23:
24: }
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
javax.servlet.ServletException: java.lang.NoClassDefFoundError: javax/mail/MessagingException
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:912)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:841)
org.apache.jsp.Activate_jsp._jspService(Activate_jsp.java:112)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.NoClassDefFoundError: javax/mail/MessagingException
org.apache.jsp.Activate_jsp._jspService(Activate_jsp.java:85)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.lang.ClassNotFoundException: javax.mail.MessagingException
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1713)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1558)
org.apache.jsp.Activate_jsp._jspService(Activate_jsp.java:85)
org.apache.jasper.runtime.HttpJ
最佳答案
原因是 MessagingException 不在您的 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。 在网络上搜索找到适合您的 jar(可能是 mail.jar)。您还可以查看这个SO question .
关于java - 尝试使用 java 类发送电子邮件时抛出错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16314671/