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啟動之后，一直報空指針異常

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 發送郵件 2-4

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3 回答

qq_虛偽的宋痞子_0
2019-06-03

請問這個問題解決了嗎

java.lang.NullPointerException

報的是這個錯誤，下面是代碼內容

try{
????Hello?h?=?new?Hello();
????h.SimpleEmail("[email protected]",?"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);
????}

}