spring boot2.x发送邮件
Posted NetWhite
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了spring boot2.x发送邮件相关的知识，希望对你有一定的参考价值。
1.引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
<version>2.2.3.RELEASE</version>
</dependency>示例spring boot工程为2.2.3.RELEASE版本
2.配置
application.yml里配置邮箱主机地址和用户名密码：
spring:
mail:
host: smtp.163.net
username: xxx@163.com
password: PASS
3.示例代码
@Component
public class MailClient {
@Autowired
private JavaMailSender mailSender;
/**
* 普通邮件发送
*
* @param from 发件人邮箱
* @param to 收件人邮箱
* @param subject 邮箱主题
* @param content 邮箱正文
*/
public void send(String from, String to, String subject, String content) {
SimpleMailMessage message = new SimpleMailMessage();
message.setFrom(from);
message.setTo(to);
message.setSubject(subject);
message.setText(content);
mailSender.send(message);
}
/**
* 发送附件
*
* @param from 发件人邮箱
* @param to 收件人邮箱
* @param subject 邮箱主题
* @param content 邮箱正文
* @param name2paths 附件名及文件路径
* @throws MessagingException 记得处理异常
*/
public void sendWithAttachment(String from, String to, String subject, String content,
Map<String, String> name2paths) throws MessagingException {
MimeMessage mimeMessage = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
helper.setFrom(from);
helper.setTo(to);
helper.setSubject(subject);
helper.setText(content);
for (Map.Entry<String, String> entry : name2paths.entrySet()) {
helper.addAttachment(entry.getKey(), new FileSystemResource(entry.getValue()));
}
mailSender.send(mimeMessage);
}
}
示例中，两个方法，一个发送普通邮件，一个发送带附件。
4.测试
@SpringBootApplication
public class EmailApplication implements CommandLineRunner {
@Autowired
private MailClient mailClient;
public static void main(String[] args) {
SpringApplication.run(EmailApplication.class, args);
}
@Override public void run(String... args) throws Exception {
mailClient.send("xxx@163.com", "target@163.m", "测试", "Hello, World");
Map<String, String> attachment = new HashMap<>();
attachment.put("logback-spring.xml", "/Users/xuxd/DemoCode/java/app.demo/app.demo-web/src/main/resources/logback-spring.xml");
mailClient.sendWithAttachment("xxx@163.com", "target@163.m", "测试", "Hello, World", attachment);
}
}
5.发送html格式的邮件
邮件内容需要美化，比如表格类，需要发送html格式的邮件。需要引入thymleaf，spring2.x和1.x用的template不一样，2.x是thymeleaf，如下是2.x示例：
1.增加template依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
<version>2.2.3.RELEASE</version>
</dependency>2.在classpath:resources/templates下增加html模板，如下：
下面是user.html的代码，里面包含了if-else和for循环的示例用法：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>User Info</title>
<style>
/** Table 表格样式 **/
table {
border-collapse: collapse;
width: 80%;
border: 1px solid #c6c6c6 !important;
margin-bottom: 20px;
}
table thead tr td {
background-color: lightblue;
}
table th {
border-collapse: collapse;
border-right: 1px solid #c6c6c6 !important;
border-bottom: 1px solid #c6c6c6 !important;
background-color: #ddeeff !important;
padding: 5px 9px;
font-size: 14px;
font-weight: normal;
text-align: center;
}
table td {
border-collapse: collapse;
border-right: 1px solid #c6c6c6 !important;
border-bottom: 1px solid #c6c6c6 !important;
padding: 5px 9px;
font-size: 12px;
font-weight: normal;
text-align: center;
word-break: break-all;
}
table tr:nth-child(odd) {
background-color: #fff !important;
}
table tr:nth-child(even) {
background-color: #f8f8f8 !important;
}
</style>
</head>
<body>
<!--如果都是男孩-->
<div th:if="${isBoys}">
<h1><span th:text="${welcome}"></span>男孩们</h1>
<div th:if="${not #lists.isEmpty(people)}">
<h2>详细信息</h2>
<table>
<thead>
<tr>
<th>用户名</th>
<th>年龄</th>
</tr>
</thead>
<tbody>
<!-- 循环遍历信息-->
<tr th:each="p:${people}">
<td th:text="${p.name}"></td>
<td th:text="${p.age}"></td>
</tr>
</tbody>
</table>
</div>
</div>
<!--否则都是女孩-->
<div th:unless="${isBoys}">
<h1><span th:text="${welcome}"></span>女孩们</h1>
<div th:if="${not #lists.isEmpty(people)}">
<h2>详细信息</h2>
<table>
<thead>
<tr>
<th>用户名</th>
<th>年龄</th>
</tr>
</thead>
<tbody>
<tr th:each="p:${people}">
<td th:text="${p.name}"></td>
<td th:text="${p.age}"></td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>3.邮件发送客户端代码：
@Component
public class MailClient {
@Autowired
private JavaMailSender mailSender;
/**
* 发送html模板的邮件，需要用
*/
@Autowired
private TemplateEngine templateEngine;
/**
* html模板的邮件
*
* @param from 发件人邮箱
* @param to 收件人邮箱
* @param subject 邮箱主题
* @param template 邮件模板
* @param vars 邮件模板中的变量参数
* @throws MessagingException 记得处理异常
*/
public void sendHtml(String from, String to, String subject, String template,
Map<String, Object> vars) throws MessagingException {
MimeMessage mimeMessage = mailSender.createMimeMessage();
MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);
helper.setFrom(from);
helper.setTo(to);
helper.setSubject(subject);
Context context = new Context();
context.setVariables(vars);
String content = templateEngine.process(template, context);
helper.setText(content, true);
mailSender.send(mimeMessage);
}
}
4.发送示例
@SpringBootApplication
public class EmailApplication implements CommandLineRunner {
@Autowired
private MailClient mailClient;
public static void main(String[] args) {
SpringApplication.run(EmailApplication.class, args);
}
@Override public void run(String... args) throws Exception {
List<User> users = new ArrayList<>();
users.add(new User("小明", 8));
users.add(new User("小王", 18));
Map<String, Object> body = new HashMap<>();
body.put("people", users);
body.put("welcome", "欢迎");
body.put("isBoys", true);
// "user"就是前面templates下的user.html模板
mailClient.sendHtml("xxx@163.com", "target@163.com", "测试", "user", body);
}
class User {
public String name;
public int age;
public User(String name, int age) {
this.name = name;
this.age = age;
}
}
}body里的值是模板需要的变量的值
以上是关于spring boot2.x发送邮件的主要内容，如果未能解决你的问题，请参考以下文章
Spring Boot2.x 的Druid连接池配置[附带监控]
Spring Boot2.x + Quartz 定时任务模块
spring cloudspring boot2.x下 使用feign，注解@EnableFeignClients 找不到的解决方法