java發送html模板的高逼格郵件

時間 2019-11-08

標籤 java 發送 html 模板郵件欄目 Java 简体版

原文原文鏈接

最近作了一個監測k8s服務pod水平伸縮發送郵件的功能（當pod的cpu/內存達到指定閾值後會水平擴展出多個pod、或者指定時間內pod數應擴展到指定數量），一開始寫了個格式很low的郵件，像下面這樣：html

主流程打通，算個v1版本吧，程序員是個追求完美的人，再說這麼低逼格的郵件，給客戶看，客戶也會不滿意。那怎麼提升郵件的逼格呢？下面寫了個簡單的demo，v2版本以下：前端

感興趣的小夥伴能夠參考，模板能夠找你公司前端和美工小姐姐設計。java

由於監測k8s服務pod水平伸縮是用go開發的，發送通知郵件提供了個接口，用springboot寫的，如下也用springboot作demopython

Springboot的pom.xml文件：程序員

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>email-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>email-demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.8.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
       <!--發送郵件的必要依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>複製代碼

pod-scale-alarm.html模板文件：模板中的{0}、{1}這樣的佔位符後面java代碼會替換掉web

<body style="color: #666; font-size: 14px; font-family: 'Open Sans',Helvetica,Arial,sans-serif;">
<div class="box-content" style="width: 80%; margin: 20px auto; max-width: 800px; min-width: 600px;">
    <div class="header-tip" style="font-size: 12px;
                                   color: #aaa;
                                   text-align: right;
                                   padding-right: 25px;
                                   padding-bottom: 10px;">
        Confidential - Scale Alarm Use Only
    </div>
    <div class="info-top" style="padding: 15px 25px;
                                 border-top-left-radius: 10px;
                                 border-top-right-radius: 10px;
                                 background: {0};
                                 color: #fff;
                                 overflow: hidden;
                                 line-height: 32px;">
        <img src="cid:icon-alarm" style="float: left; margin: 0 10px 0 0; width: 32px;" /><div style="color:#010e07"><strong>服務實例水平伸縮通知</strong></div>
    </div>
    <div class="info-wrap" style="border-bottom-left-radius: 10px;
                                  border-bottom-right-radius: 10px;
                                  border:1px solid #ddd;
                                  overflow: hidden;
                                  padding: 15px 15px 20px;">
        <div class="tips" style="padding:15px;">
            <p style=" list-style: 160%; margin: 10px 0;">Hi,</p>
            <p style=" list-style: 160%; margin: 10px 0;">{1}</p>
        </div>
        <div class="time" style="text-align: right; color: #999; padding: 0 15px 15px;">{2}</div>
        <br>
        <table class="list" style="width: 100%; border-collapse: collapse; border-top:1px solid #eee; font-size:12px;">
            <thead>
            <tr style=" background: #fafafa; color: #333; border-bottom: 1px solid #eee;">
                {3}
            </tr>
            </thead>
            <tbody>
            {4}
            </tbody>
        </table>
    </div>
</div>
</body>複製代碼

success-alarm.png圖標：java代碼以下，簡單的demo，優化能夠本身在項目中去作。面試

package com.example.emaildemo;

import org.apache.commons.lang3.time.DateFormatUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.MessageFormat;
import java.util.Date;
import java.util.Objects;
import java.util.Properties;

/**
 * @program: email-demo
 * @description:
 * @author: smallsoup
 * @create: 2019-01-27 16:44
 **/

public class SendEmailUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(SendEmailUtil.class);

    public static void main(String[] args) throws MessagingException, IOException {

        JavaMailSenderImpl javaMailSender = new JavaMailSenderImpl();
        javaMailSender.setUsername("你的郵箱地址");
        javaMailSender.setPassword("你的郵箱AUTH密碼,不是登錄密碼哦,在郵箱的設置裏單獨開啓和設置");
        javaMailSender.setHost("smtp.exmail.qq.com");
        javaMailSender.setPort(587);
        javaMailSender.setDefaultEncoding("UTF-8");
        Properties props = new Properties();
        props.setProperty("mail.smtp.host", "smtp.exmail.qq.com");
        props.setProperty("mail.transport.protocol", "smtp");
        props.setProperty("mail.smtp.auth", "true");
        props.setProperty("mail.smtp.connectiontimeout", "20000");
        props.setProperty("mail.smtp.timeout", "20000");
        javaMailSender.setJavaMailProperties(props);

        MimeMessage message = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8");
        helper.setTo(new String[]{"收件人郵箱"});
        helper.setCc("抄送人郵箱");
        helper.setFrom("你的郵箱地址");
        helper.setSubject("liang subject");
        helper.setText(buildContent(), true);


        String alarmIconName = "success-alarm.png";
        ClassPathResource img = new ClassPathResource(alarmIconName);
        if (Objects.nonNull(img)) {
            helper.addInline("icon-alarm", img);
        }
        javaMailSender.send(message);
    }

    private static String buildContent() throws IOException {

        //加載郵件html模板
        String fileName = "pod-scale-alarm.html";
        InputStream inputStream = ClassLoader.getSystemResourceAsStream(fileName);
        BufferedReader fileReader = new BufferedReader(new InputStreamReader(inputStream));
        StringBuffer buffer = new StringBuffer();
        String line = "";
        try {
            while ((line = fileReader.readLine()) != null) {
                buffer.append(line);
            }
        } catch (Exception e) {
            LOGGER.error("讀取文件失敗，fileName:{}", fileName, e);
        } finally {
            inputStream.close();
            fileReader.close();
        }


        String contentText = "如下是服務實例伸縮信息, 敬請查看.<br>below is the information of service instance scale, please check. ";
        //郵件表格header
        String header = "<td>分區(Namespace)</td><td>服務(Service)</td><td>伸縮結果(Scale Result)</td><td>伸縮緣由(Scale Reason)</td><td>當前實例數(Pod instance number)</td>";
        StringBuilder linesBuffer = new StringBuilder();
        linesBuffer.append("<tr><td>" + "myNamespace" + "</td><td>" + "myServiceName" + "</td><td>" + "myscaleResult" + "</td>" +
                "<td>" + "mReason" + "</td><td>" + "my4" + "</td></tr>");

        //綠色
        String emailHeadColor = "#10fa81";
        String date = DateFormatUtils.format(new Date(), "yyyy/MM/dd HH:mm:ss");
        //填充html模板中的五個參數
        String htmlText = MessageFormat.format(buffer.toString(), emailHeadColor, contentText, date, header, linesBuffer.toString());

        //改變表格樣式
        htmlText = htmlText.replaceAll("<td>", "<td style=\"padding:6px 10px; line-height: 150%;\">");
        htmlText = htmlText.replaceAll("<tr>", "<tr style=\"border-bottom: 1px solid #eee; color:#666;\">");
        return htmlText;
    }
}複製代碼

本公衆號免費提供csdn下載服務，海量IT學習資源，若是你準備入IT坑，勵志成爲優秀的程序猿，那麼這些資源很適合你，包括但不限於java、go、python、springcloud、elk、嵌入式、大數據、面試資料、前端等資源。同時咱們組建了一個技術交流羣，裏面有不少大佬，會不定時分享技術文章，若是你想來一塊兒學習提升，能夠公衆號後臺回覆【2】，免費邀請加技術交流羣互相學習提升，會不按期分享編程IT相關資源。spring

掃碼關注，精彩內容第一時間推給你apache