前言:上一篇博文講解了郵件發送的基礎用法(數據是寫死的),然而在實際開發中,大多數狀況下郵件內容都是根據業務來動態生成的。因此在此篇博文中,咱們將講解郵件發送攜帶數據的幾種方案。html
1、解析自定義佔位符spring
實現方法: 經過解析自定義佔位符,將傳遞到郵件中的數據,轉換成html內容,進行發送。apache
1)佔位符替換函數函數
/** * Replaces place holder ("${}") string in template with values in Map * * @param template * @param models * @return */ public static String replacePlaceHolder(String template, Map<String, String> models) { if (template.indexOf("${") == -1) { return template; } while (true) { int start = template.indexOf("${"); int end = template.indexOf("}", start); if (start != -1 && end != -1) { String key = template.substring(start + 2, end); if (models.containsKey(key)) { template = template.substring(0, start) + models.get(key) + template.substring(end + 1); } } else { break; } } return template; }
2) 郵件發送Test-Caseui
// 1. Resolve html template to real text String htmlTemplate = "<html lang='zh-cn'><head></head><body><h1>發送帶模板數據的Email</h1><p>你好,${username}。本次您的驗證碼爲${code},請妥善保管</p></body></html>"; Map<String, String> models = new HashMap<String, String>(); models.put("username", "XXX"); models.put("code", "4551"); String text = StringUtils.replacePlaceHolder(htmlTemplate, models); // 2. send email boolean result = mailHandler.sendText("收件人郵箱", "發送帶模板數據的Email", text); Assert.assertEquals(true, result);
2、使用Velocity模板spa
實現方法:借用VelocityEngineUtils合併Velocity模板和數據,獲得要發送的Email, 進行發送。code
1) 引入依賴jar包orm
<!-- velocity --> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity</artifactId> <version>1.7</version> </dependency>
2) 配置Velocity模板引擎htm
<!-- Define velocity engine -->
<bean id="velocityEngine" class="org.springframework.ui.velocity.VelocityEngineFactoryBean">
<property name="configLocation" value="classpath:velocity.properties" />
</bean>
velocity.properties:
input.encoding=UTF-8 output.encoding=UTF-8 resource.loader=class class.resource.loader.class=org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader
3) 發送郵件實現函數blog
// Get email content by velocity merge models
String content = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, template, encoding, models);
// Send email MimeMessage mimeMessage = mailSender.createMimeMessage(); MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, encoding); helper.setFrom(form); // set sender helper.setTo(to); // set recipients helper.setSubject(subject); helper.setText(content, true); // Indicate the text included is HTML mailSender.send(mimeMessage);
3、使用FreeMarker模板
實現方法:借用FreeMarkerTemplateUtils合併FreeMarker模板和數據,獲得要發送的Email, 進行發送。
1) 引入依賴jar包
<dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.23</version> </dependency>
2)配置FreeMarker
<!-- Define freemarker configuration -->
<bean id="freeMarkerConfiguration" class="org.springframework.ui.freemarker.FreeMarkerConfigurationFactoryBean">
<property name="templateLoaderPath" value="classpath:template/freemarker" />
<property name="defaultEncoding" value="utf-8" />
<property name="freemarkerSettings">
<props>
<prop key="template_update_delay">10</prop>
<prop key="locale">zh_CN</prop>
<prop key="number_format">#.##</prop>
</props>
</property>
</bean>
3) 發送郵件實現函數
// Get email content by freeMarker template
Template realTemplate = freeMarkerConfigurer.getTemplate(template); String content = FreeMarkerTemplateUtils.processTemplateIntoString(realTemplate, models);
// Send email
MimeMessage mimeMessage = mailSender.createMimeMessage(); MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true, encoding); helper.setFrom(form); // set sender helper.setTo(to); // set recipients helper.setSubject(subject); helper.setText(content, true); // Indicate the text included is HTML mailSender.send(mimeMessage);