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                        /后端开发
                        
                            /Java
                        
                        /Spring Boot 发送邮件

启动之后，一直报空指针异常

sendMessageTest(com.neo.helloWord.service.ServiceTest) Time elapsed: 0.026 sec <<< ERROR!

java.lang.NullPointerException: null

at com.neo.helloWord.hello.MailService.sendSimpleMail(MailService.java:34)

at com.neo.helloWord.service.ServiceTest.sendMessageTest(ServiceTest.java:26)

2019-04-03 16:06:14.461 INFO 5236 --- [ Thread-2] o.s.w.c.s.GenericWebApplicationContext : Closing org.springframework.web.context.support.GenericWebApplicationContext@26275bef: startup date [Wed Apr 03 16:06:10 CST 2019]; root of context hierarchy

Results :

Tests in error:

ServiceTest.sendMessageTest:26 ? NullPointer

lhw901013

2019-04-03

源自：Spring Boot 发送邮件 2-4

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3 回答

qq_虚伪的宋痞子_0
2019-06-03

请问这个问题解决了吗

java.lang.NullPointerException

报的是这个错误，下面是代码内容

try{
    Hello h = new Hello();
    h.SimpleEmail("shizengs@aliyun.com", "This is Subject", "This is Content");
}catch (Exception e){
    System.out.println(e);
}

@RestController
public class Hello {
    @Value("${spring.mail.username}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    @RequestMapping(value="/sendEmail", method = RequestMethod.GET)
    public void SimpleEmail(String to, String subject, String content){
        SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
        simpleMailMessage.setTo(to);
        simpleMailMessage.setSubject(subject);
        simpleMailMessage.setText(content);
        simpleMailMessage.setFrom(from);
        mailSender.send(simpleMailMessage);
    }

}