@Service("emailService")
public class EmailService {
  @Autowired private JavaMailSenderImpl mailSender;
  ...
  public void send(...) {
    // send logic
  }
}

我在阅读有关相关主题的同时阅读了一个解决方案.关键点在于JavaMailSender接口在applicationContext.xml中定义为Spring JavaMailSenderImpl类.

步骤1：修改应用程序上下文文件以包含以下bean定义：

@Service("emailService")
public class EmailService {
  @Autowired private JavaMailSender mailSender;   // Observe the change in the type
  ...