Java 使用spring框架发送电子邮件时出错
以下是发送电子邮件的我的代码。Java 使用spring框架发送电子邮件时出错,java,spring,spring-mvc,Java,Spring,Spring Mvc,以下是发送电子邮件的我的代码。 import org.springframework.mail.MailSender; import org.springframework.mail.SimpleMailMessage; public class TestArrayList { private MailSender mailSender; public void sendMail(String from, String to, String subject, String ms
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
public class TestArrayList {
private MailSender mailSender;
public void sendMail(String from, String to, String subject, String msg) {
SimpleMailMessage message = new SimpleMailMessage();
message.setFrom(from);
message.setTo(to);
message.setSubject(subject);
message.setText(msg);
mailSender.send(message);
}
public static void main(String[] args) {
TestArrayList obj=new TestArrayList();
obj.sendMail("from@no-spam.com", "to@no-spam.com", "Testing123", "Testing only \n\n Hello Spring Email Sender");
}
}
但是我得到了下面的错误信息,我没有得到我错的地方
Exception in thread "main" java.lang.NullPointerException
at TestArrayList.sendMail(TestArrayList.java:16)
at TestArrayList.main(TestArrayList.java:20)
此处的mailssender
为null
,因为它未初始化。初始化它
private MailSender mailSender = new MailSender();
或者使用Spring注释将其注入。当您尝试初始化mailSender时,它无法实例化类型mailSender错误消息…@vijayk:从stacktrace添加更多详细信息,以便我们可以确定确切的问题。我只是初始化mailSender对象,但当您当时键入时它会出错。@vijayk:我猜
mailssender
是一个您需要使用其实现的接口。
private MailSender mailSender = new MailSender();