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前言
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現(xiàn)在的消息模塊少不了郵件發(fā)送、短信發(fā)送和手機(jī)推送的功能。郵件發(fā)送的功能歷史最為悠久,也算的上爛大街的功能。一般在配置文件中設(shè)置好郵箱地址、賬號(hào)、密碼和發(fā)件服務(wù)器地址后便不會(huì)再去改動(dòng)??墒怯械目蛻魠s希望人為指定發(fā)件人信息。這個(gè)需求并不過(guò)分,需要解決兩個(gè)大問(wèn)題:如何在容器啟動(dòng)成功后重新修改發(fā)送郵件的Bean。如何在服務(wù)器重啟后,發(fā)件人依然是更改后的配置信息。這里記錄實(shí)現(xiàn)的步驟。
需求分析
一)、在未配置郵箱賬號(hào)時(shí),系統(tǒng)擁有默認(rèn)的郵箱發(fā)件人
二)、重新設(shè)置郵箱發(fā)件人后,需立即生效
三)、重啟服務(wù)器后,郵箱發(fā)件人依然是更改后的郵箱賬號(hào),而非默認(rèn)發(fā)件人
基礎(chǔ)的郵箱發(fā)送
郵箱發(fā)送的功能放在現(xiàn)在變得非常的簡(jiǎn)單好用,一導(dǎo)二配三發(fā)送。😊
第一步:導(dǎo)入郵箱依賴包
compile('org.springframework.boot:spring-boot-starter-mail')
第二步:配置發(fā)件人郵箱信息
spring: mail: host: smtp.mxhichina.com username: itdragon@xx password: itdragon default-encoding: utf-8
第三步:發(fā)送郵件
@Autowired lateinit var javaMailSender: JavaMailSender fun pushMsgEmail(target: String, subject: String, content: String) { if (target.isEmpty() || !Pattern.matches(REG_EMAIL_FORMAT, target)) return val mailMsg = SimpleMailMessage() mailMsg.setFrom(mailUserName!!) mailMsg.setTo(target) mailMsg.setSubject(subject) mailMsg.setText(content) javaMailSender.send(mailMsg) }
可配置的郵件發(fā)送
這里的可配置值的是配置郵箱的發(fā)件人。首先我們要解決第一個(gè)問(wèn)題,JavaMailSender 的Bean對(duì)象是在容器啟動(dòng)成功后就已經(jīng)注入到容器中。如何在容器啟動(dòng)后重新注入新的JavaMailSender 的Bean對(duì)象呢?
網(wǎng)上找了一些案例,他們都是通過(guò)銷毀Bean然后再重新創(chuàng)建Bean的方式實(shí)現(xiàn)。我有點(diǎn)好奇地是,為什么不直接將新的對(duì)象直接賦值從而替換原有的Bean對(duì)象?Spring默認(rèn)是單例模式,從Java內(nèi)存的角度看,這樣做似乎沒(méi)毛??!如果有不對(duì)的地方望不吝賜教😋
@Autowired lateinit var javaMailSender: JavaMailSender fun configEmail(postMailConfig: PostMailConfig): JavaMailSender { val javaMailSender = JavaMailSenderImpl() javaMailSender.host = postMailConfig.mailHost javaMailSender.username = postMailConfig.mailUsername javaMailSender.password = postMailConfig.mailPassword val javaMailProperties = Properties() javaMailProperties["mail.smtp.auth"] = true javaMailProperties["mail.smtp.starttls.enable"] = true javaMailProperties["mail.smtp.timeout"] = 5000 javaMailProperties["mail.smtp.socketFactory.class"] = "javax.net.ssl.SSLSocketFactory" javaMailProperties["mail.smtp.socketFactory.port"] = "465" javaMailProperties["mail.smtp.port"] = "465" javaMailSender.javaMailProperties = javaMailProperties this.javaMailSender = javaMailSender return javaMailSender }
再來(lái)解決第二個(gè)問(wèn)題,服務(wù)器重啟后,默認(rèn)情況下依然會(huì)重新加載application.yml中的配置信息。這會(huì)出現(xiàn)郵箱發(fā)件人和實(shí)際配置的發(fā)件人不匹配的情況。其實(shí)這個(gè)問(wèn)題也很好解決,加一個(gè)事件監(jiān)聽器,在容器初始化成功后執(zhí)行,根據(jù)之前保存的郵箱信息,重新配置郵箱。當(dāng)然,我們需要一張表記錄當(dāng)前發(fā)件人信息。
// 創(chuàng)建事件監(jiān)聽器 class ApplicationStartup : ApplicationListener{ override fun onApplicationEvent(contextRefreshedEvent: ContextRefreshedEvent) { val systemBaseConfigMapper = contextRefreshedEvent.applicationContext.getBean(SystemBaseConfigMapper::class.java) val postMailConfig = systemBaseConfigMapper.selectByMail() val mailService = contextRefreshedEvent.applicationContext.getBean(MailService::class.java) mailService.configEmail(postMailConfig) } } // 注冊(cè)事件監(jiān)聽器 fun main(args: Array ) { val springApplication = SpringApplication(StartApplication::class.java) springApplication.addListeners(ApplicationStartup()) springApplication.run(*args) }
最后發(fā)送郵件的代碼如下
@Service class MailServiceImpl : MailService { @Value("\${spring.mail.username}") var mailUserName: String? = null @Autowired lateinit var javaMailSender: JavaMailSender @Autowired lateinit var systemBaseConfigMapper: SystemBaseConfigMapper override fun pushMsgEmail(target: String, subject: String, content: String) { if (target.isEmpty() || !Pattern.matches(REG_EMAIL_FORMAT, target)) return val mailMsg = SimpleMailMessage() mailMsg.setFrom(mailUserName!!) mailMsg.setTo(target) mailMsg.setSubject(subject) mailMsg.setText(content) try { systemBaseConfigMapper.selectByMailName()?.let { mailMsg.setFrom(it.value!!) } javaMailSender.send(mailMsg) } catch (e: Exception) { e.printStackTrace() } } override fun configEmail(postMailConfig: PostMailConfig): JavaMailSender { val javaMailSender = JavaMailSenderImpl() javaMailSender.host = postMailConfig.mailHost javaMailSender.username = postMailConfig.mailUsername javaMailSender.password = postMailConfig.mailPassword val javaMailProperties = Properties() javaMailProperties["mail.smtp.auth"] = true javaMailProperties["mail.smtp.starttls.enable"] = true javaMailProperties["mail.smtp.timeout"] = 5000 javaMailProperties["mail.smtp.socketFactory.class"] = "javax.net.ssl.SSLSocketFactory" javaMailProperties["mail.smtp.socketFactory.port"] = "465" javaMailProperties["mail.smtp.port"] = "465" javaMailSender.javaMailProperties = javaMailProperties this.javaMailSender = javaMailSender return javaMailSender } }
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持創(chuàng)新互聯(lián)。
新聞標(biāo)題:SpringBoot動(dòng)態(tài)配置郵箱發(fā)件人過(guò)程解析
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