springboot发送邮件

1、发送简单邮件

2、发送带附件的邮件

3、发送模板邮件

 　　pom.xml

<?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>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>JpaAndTxDemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>boot-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-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

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

　　application.properties

server.port=80
server.servlet.context-path=/

#禁用freemarker缓存
spring.freemarker.cache=false

logging.level.root=info
logging.file=d:/logs/boot-demo.log

#发送邮件的配置
spring.mail.host=smtp.163.com
spring.mail.username=xxx@163.com
spring.mail.password=yyy
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

　　EmailConfig

package com.oy.mail;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class EmailConfig {

    @Value("${spring.mail.username}")
    private String emailFrom;

    public String getEmailFrom() {
        return emailFrom;
    }

    public void setEmailFrom(String emailFrom) {
        this.emailFrom = emailFrom;
    }
    
}

　　EmailController

package com.oy.mail;

import java.io.File;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class EmailController {

    @Autowired
    private EmailService emailService;
    
    @RequestMapping("/simple")
    @ResponseBody
    public String sendSimpleEmail() {
        emailService.sendSimpleMail("收件人", "测试标题", "测试内容");
        return "ok";
    }
    
    @RequestMapping("/attach")
    @ResponseBody
    public String sendAttachmentEmail() {
        File file = new File("src/main/resources/static/1.txt");
        emailService.sendAttachmentMail("收件人", "测试标题", "测试内容", file);
        return "ok";
    }
    
    @RequestMapping("/temp")
    @ResponseBody
    public String sendTemplateEmail() {
        emailService.sendTemplateMail("收件人", "测试标题", "test.html");
        return "ok";
    }
}

　　EmailService

package com.oy.mail;

import java.io.File;

public interface EmailService {

    // 发送简单邮件
    void sendSimpleMail(String sendTo, String title, String content);
    // 发送带附件的邮件
    void sendAttachmentMail(String sendTo, String title, String content, File file);
    // 发送模板邮件; 第三个参数：模板文件名
    void sendTemplateMail(String sendTo, String title, String templateFileName);
}

　　EmailServiceImpl

package com.oy.mail;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import javax.mail.internet.MimeMessage;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
import org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer;

import freemarker.template.Template;

@Service
public class EmailServiceImpl implements EmailService {

    @Autowired
    private EmailConfig emailConfig;
    @Autowired
    private JavaMailSender mailSender;
    @Autowired
    private FreeMarkerConfigurer freeMarkerConfigurer;
    
    // 发送简单邮件
    @Override
    public void sendSimpleMail(String sendTo, String title, String content) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(emailConfig.getEmailFrom());
        message.setTo(sendTo);
        message.setSubject(title);
        message.setText(content);
        mailSender.send(message);
    }

    // 发送带附件的邮件
    @Override
    public void sendAttachmentMail(String sendTo, String title, String content, File file) {
        MimeMessage msg = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(msg, true);
            helper.setFrom(emailConfig.getEmailFrom());
            helper.setTo(sendTo);
            helper.setSubject(title);
            helper.setText(content);
            // 附件
            FileSystemResource r = new FileSystemResource(file);
            helper.addAttachment(file.getName(), r); // 第一个参数为发送的附件显示的名称
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        mailSender.send(msg);
    }

    // 发送模板邮件
    @Override
    public void sendTemplateMail(String sendTo, String title, String templateFileName) {
        MimeMessage msg = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(msg, true);
            helper.setFrom(emailConfig.getEmailFrom());
            helper.setTo(sendTo);
            helper.setSubject(title);

            // 封装模板使用的数据
            Map<String, Object> model = new HashMap<>();
            model.put("msg", "邮件内容文本");
            
            // 得到模板
            Template template = freeMarkerConfigurer.getConfiguration().getTemplate(templateFileName);
            String html = FreeMarkerTemplateUtils.processTemplateIntoString(template, model);
            
            System.out.println("模板内容:" + html);
            helper.setText(html, true);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        mailSender.send(msg);
    }

}

　　发送模板邮件的测试模板test.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<font color="red">${msg}</font>
</body>
</html>

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