spring,freemarker,异步发邮件

1.引入jar.

<dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-context</artifactId>    <version>4.1.6.RELEASE</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-context-support</artifactId>    <version>4.1.6.RELEASE</version></dependency><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-webmvc</artifactId>    <version>4.1.6.RELEASE</version></dependency><dependency>    <groupId>org.freemarker</groupId>    <artifactId>freemarker</artifactId>    <version>2.3.20</version></dependency><dependency>    <groupId>javax.mail</groupId>    <artifactId>mail</artifactId>    <version>1.4</version></dependency>

2.mailtemplates模板目录下制作demo.ftl模板

demo.ftl

<a href="http://www.xxx.com">你好${username}</a>

3.spring配置文件

<beans xmlns="http://www.springframework.org/schema/beans"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:p="http://www.springframework.org/schema/p"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd      http://www.springframework.org/schema/context      http://www.springframework.org/schema/context/spring-context.xsd      http://www.springframework.org/schema/tx      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd      http://www.springframework.org/schema/aop      http://www.springframework.org/schema/aop/spring-aop-3.0.xsd      http://www.springframework.org/schema/mvc      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">    <bean id="templateEmail" class="com.huazhu.picc.base.TemplateEmail">        <property name="sender" ref="mailsender"></property>        <property name="threadPool" ref="threadPool"></property>        <property name="freeMarkerConfigurer" ref="freeMarker"></property>    </bean>    <bean id="mailsender" class="org.springframework.mail.javamail.JavaMailSenderImpl">        <property name="host">            <value>mail.xxx.com</value>        </property>        <property name="username">            <value>aaa</value>        </property>        <property name="password">            <value>bbb</value>        </property>        <property name="javaMailProperties">            <props>                <prop key="mail.smtp.auth">true</prop>                <prop key="mail.smtp.timeout">25000</prop>            </props>        </property>    </bean>    <bean id="freeMarker" class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">        <property name="templateLoaderPath" value="classpath:mailtemplates"/><!--指定模板文件目录-->        <property name="freemarkerSettings"><!-- 设置FreeMarker环境属性-->            <props>                <prop key="template_update_delay">1800</prop><!--刷新模板的周期，单位为秒-->                <prop key="default_encoding">UTF-8</prop><!--模板的编码格式 -->                <prop key="locale">zh_CN</prop><!-- 本地化设置-->            </props>        </property>    </bean>    <bean id="threadPool" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">        <!-- 核心线程数  -->        <property name="corePoolSize" value="4" />        <!-- 最大线程数 -->        <property name="maxPoolSize" value="30" />        <!-- 队列最大长度 >=mainExecutor.maxSize -->        <property name="queueCapacity" value="50" />        <!-- 线程池维护线程所允许的空闲时间 -->        <property name="keepAliveSeconds" value="300" />        <!-- 线程池对拒绝任务(无线程可用)的处理策略 -->        <property name="rejectedExecutionHandler">            <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy"/>        </property>    </bean></beans>

4.发送类

import freemarker.template.Template;import org.springframework.mail.MailException;import org.springframework.mail.javamail.JavaMailSender;import org.springframework.mail.javamail.MimeMessageHelper;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;import javax.mail.MessagingException;import javax.mail.internet.MimeMessage;import java.util.Map;/** * 发送邮件 可以自己编写html模板 * Created by aaa on 2017/5/12. */public class TemplateEmail {    private JavaMailSender sender;    private ThreadPoolTaskExecutor threadPool;    private FreeMarkerConfigurer freeMarkerConfigurer=null;//FreeMarker的技术类    public void setFreeMarkerConfigurer(FreeMarkerConfigurer freeMarkerConfigurer) {        this.freeMarkerConfigurer = freeMarkerConfigurer;    }    public void setSender(JavaMailSender sender) {        this.sender = sender;    }    public void setThreadPool(ThreadPoolTaskExecutor threadPool) {        this.threadPool = threadPool;    }    /**     * 生成html模板字符串     * @param root 存储动态数据的map     * @return     */    private String getMailText(Map<String,Object> root,String templateName){        String htmlText="";        try {            //通过指定模板名获取FreeMarker模板实例            Template tpl=freeMarkerConfigurer.getConfiguration().getTemplate(templateName);            htmlText=FreeMarkerTemplateUtils.processTemplateIntoString(tpl,root);        } catch (Exception e) {            e.printStackTrace();        }        return htmlText;    }    /**     * 发送邮件     * @param root 存储动态数据的map     * @param toEmail 邮件地址     * @param subject 邮件主题     * @return     */    public void sendTemplateMail(final Map<String,Object> root,final  String toEmail,final String subject,final String templateName){        //异步发送邮件        threadPool.execute(new Runnable() {            public void run() {                try {                    MimeMessage msg=sender.createMimeMessage();                    MimeMessageHelper helper=new MimeMessageHelper(msg,false,"utf-8");//由于是html邮件，不是mulitpart类型                    helper.setFrom("[e-mail]");                    helper.setTo(toEmail);                    helper.setSubject(subject);                    String htmlText=getMailText(root,templateName);//使用模板生成html邮件内容                    helper.setText(htmlText, true);                    sender.send(msg);                } catch (MailException e) {                    e.printStackTrace();                } catch (MessagingException e) {                    e.printStackTrace();                }            }        });    }}

5.测试

Map<String,Object> root = new HashMap<String,Object>();root.put("username", "ajun");templateEmail.sendTemplateMail(root, "[e-mail]", "主题标题", "demo.ftl");