Velocity 、Freemarker模板及Spring Api实现发送邮件

时间：2022-11-24 19:11:18

Veloctiy

1、spring配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">


<bean id="velocityEngine" class="org.springframework.ui.velocity.VelocityEngineFactoryBean" scope="prototype">
<property name="velocityProperties">
<props>
<prop key="resource.loader">file</prop>
<!--指定模板所在路径-->
<prop key="file.resource.loader.path">D:\workspace_git_2\jd-notice\jd-noticeman-web\src\main\resources\</prop>
<prop key="file.resource.loader.class">
                    org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader
</prop>
<prop key="input.encoding">UTF-8</prop>
<prop key="output.encoding">UTF-8</prop>
</props>
</property>
</bean>

<!--<bean id="freeMarkerConfiguration" class="org.springframework.ui.freemarker.FreeMarkerConfigurationFactoryBean">
 <property name="templateLoaderPath" value="classpath:emailtemplates" />
 </bean>-->
</beans>

2、Velocity测试类

import com.alibaba.fastjson.JSON;
import com.jd.notice.mail.vo.Student;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.context.Context;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.ui.velocity.VelocityEngineUtils;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by wangyingjie1 on 2017/7/6.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/spring-config-email.xml")
public class VelocityEngineUtilsTest {


    @Autowired
    private VelocityEngine velocityEngine;//spring配置中定义

    @Test
    public void testRenderMailByConfig() {
        //获取vm模板所需的参数信息
        Map model = getModelMap();

        Object value = JSON.toJSON(new Student(1, "zhangsan" + 1));
        model.put("jsonString", value);

        System.out.println("getStudentList===========>" + model.get("list"));

        renderMailContext(model, "template.vm");
    }


    private Map getModelMap() {
        return new HashMap() {
            {
                put("name", "zhangsan");
                put("sex", "male");
                //模板里面嵌套的表格数据
                put("list", getStudentList());
            }
        };
    }

    //list 里面装的类型是 JSONObject
    private List<Object> getStudentList() {
        List<Object> list = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            list.add(JSON.toJSON(new Student(i, "zhangsan" + i)));
        }

        //String jsonString = JSONArray.toJSONString(list);
        //System.out.println(jsonString);
        return list;
    }


/**
 * 根据参数及vm模板 渲染邮件内容
 */
    public String renderMailContext(Map model, String templateName) {
        String result = null;
        try {

            result = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, templateName, "UTF-8", model);
        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println(result);
        return result;
    }


    @Test
    public void testRenderMailByCreate() {
        //读取固定路径下面的模板文件
        readerMailText();
    }


    public void readerMailText() {
        try {

            VelocityEngine velocityEngine = new VelocityEngine();

            //TODO 指定下载下来的文件所放的路径
            velocityEngine.setProperty(RuntimeConstants.FILE_RESOURCE_LOADER_PATH, "D:\\workspace_git_2\\jd-notice\\jd-noticeman-web\\src\\main\\resources\\");
            velocityEngine.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());

            velocityEngine.init();

            //TODO 模板的名称
            Template template = velocityEngine.getTemplate("template.vm", "UTF-8");

            Context context = new VelocityContext();
            context.put("name", "zhangsan");
            context.put("sex", "male");
            context.put("list", getStudentList());

            System.out.println("template==============" + template);

            StringWriter stringWriter = new StringWriter();

            template.merge(context, stringWriter);

            System.out.println(stringWriter);

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}
public class Student {

private int sid;
private String sname;


public Student() {
    }

public Student(int sid, String sname) {
this.sid = sid;
this.sname = sname;
    }

public int getSid() {
return sid;
    }

public void setSid(int sid) {
this.sid = sid;
    }

public String getSname() {
return sname;
    }

public void setSname(String sname) {
this.sname = sname;
    }
}

3、Velocity测试模板

===============邮件VM模板=================

$name  =============  $sex
<span>Sent using Velocity Template</span>

#foreach ($!student in $!jsonString)
<tr>
    <td>$!student</td>
</tr>
#end

## VM模板中有表格的情况
#foreach ($!student in $!list)
<tr>
    <td> $!student.sid </td>
    <td> $!student.sname </td>
</tr>
#end

Freemarker

1、Freemarker测试类

import com.alibaba.fastjson.JSON;
import com.jd.notice.mail.vo.Student;
import freemarker.cache.FileTemplateLoader;
import freemarker.template.Configuration;
import freemarker.template.Template;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Created by wangyingjie1 on 2017/7/6.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/spring-config-email.xml")
public class FreeMarkerTemplateUtilsTest {

@Test
public void testRenderMailText() {

        Map model = new HashMap() {
            {
                put("name", "zhangsan");
                put("sex", "male");
//模板里面嵌套的表格数据
                put("list", getStudentList());
            }
        };

        renderMailText(model, "template.vm");
    }


/**
 * 根据参数及freemarker模板 渲染邮件内容
 */
public String renderMailText(Map model, String templateName) {

        String result = null;
try {

            Template template = getTemplate(templateName);

            result = FreeMarkerTemplateUtils.processTemplateIntoString(template, model);

        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println(result);

return result;
    }


//list 里面装的类型是 JSONObject
private List<Object> getStudentList() {
        List<Object> list = new ArrayList<>();
for (int i = 0; i < 5; i++) {
            list.add(JSON.toJSON(new Student(i, "zhangsan" + i)));
        }

//String jsonString = JSONArray.toJSONString(list);
//System.out.println(jsonString);
return list;
    }

private Template getTemplate(String templateName) throws IOException {

//todo 优先取缓存 --> key 缓存没有则去JSS上下载模板

        File file = new File("D:\\workspace_git_2\\jd-notice\\jd-noticeman-web\\src\\main\\resources\\");
        Configuration config =  Configuration.getDefaultConfiguration();
        FileTemplateLoader fileTemplateLoader = new FileTemplateLoader(file);
        config.setTemplateLoader(fileTemplateLoader);

//todo 需将模板放缓存

return config.getTemplate(templateName, "UTF-8");
    }

}

2、Freemarker测试模板

===============邮件FreeMarker模板=================
<html>
<body>
<h3>User name: $name has been deleted.</h3>
<h6>Detail:</h6>
<div>
<p>user name : ${name} .</p>
<p>user sex : ${sex} .</p>
</div>
<span>Sent using FreeMarker Template</span>
</body>
</html>

## FreeMarker模板中有表格的情况
<#list list as student>
<tr>
<td> ${student.sid} </td>
<td> ${student.sname} </td>
</tr>
</#list>

Spring邮件发送处理

import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;

/**
 * Created by wangyingjie1 on 2017/7/7.
 *
 *
 */
public class SpringJavaMailSenderTest {


public static void main(String[] args) {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setHost("smtp.jd.com");

// TODO username 为公共邮箱前缀
        mailSender.setUsername("yingjie1");
        mailSender.setPassword("xxxxxxxxxxx");

// org.springframework.mail.javamail.MimeMessageHelper 类可以实现邮件附件的发送
// spring 的api
        SimpleMailMessage smm = new SimpleMailMessage();

// TODO 注意发件人的地址必须有 @jd.com
        smm.setFrom("xxxxx1@jd.com");

        smm.setTo("yyyyyyyyyy@jd.com");
        smm.setSubject("Hello world");
        smm.setText("Hello world via spring mail sender");

// TODO 执行邮件发送
        mailSender.send(smm);

    }

}
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