无涯教程-Spring Boot - 邮件发送通过使用Spring Boot RESTful web服务，您可以发送具

通过使用Spring Boot RESTful web服务，您可以发送具有Gmail传输层安全性的电子邮件。在本章中，无涯教程将详细了解如何使用此功能。

首先，需要在构建配置文件中添加Spring Boot starter Mail依赖项。

Maven用户可以将以下依赖项添加到pom.xml文件中。

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

Gradle用户可以在build.gradle文件中添加以下依赖项。

 compile(org.springframework.boot:spring-boot-starter-mail)

下面给出了Spring Boot主应用程序类文件的代码

package com.learnfk.emailapp;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class EmailappApplication {
public static void main(String[] args) {
SpringApplication.run(EmailappApplication.class, args);
}
}

您可以编写一个简单的REST API在REST控制器类文件中发送到电子邮件，如下所示。

package com.learnfk.emailapp;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class EmailController {
@RequestMapping(value="/sendemail")
public String sendEmail() {
return "Email sent successfully";
}

}

您可以编写一个方法来发送带有附件的电子邮件。定义mail.smtp属性并使用PasswordAuthentication。

private void sendmail() throws AddressException, MessagingException, IOException {
   Properties props=new Properties();
   props.put("mail.smtp.auth", "true");
   props.put("mail.smtp.starttls.enable", "true");
   props.put("mail.smtp.host", "smtp.gmail.com");
   props.put("mail.smtp.port", "587");
Session session=Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("learnfk@gmail.com", "<your password>");
}
});
Message msg=new MimeMessage(session);
msg.setFrom(new InternetAddress("learnfk@gmail.com", false));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse("learnfk@gmail.com"));
msg.setSubject("Learnfk point email");
msg.setContent("Learnfk point email", "text/html");
msg.setSentDate(new Date());
MimeBodyPart messageBodyPart=new MimeBodyPart();
messageBodyPart.setContent("Learnfk point email", "text/html");
Multipart multipart=new MimeMultipart();
multipart.addBodyPart(messageBodyPart);
MimeBodyPart attachPart=new MimeBodyPart();
attachPart.attachFile("/var/tmp/image19.png");
multipart.addBodyPart(attachPart);
msg.setContent(multipart);
Transport.send(msg);

}

现在，从rest API调用上面的sendmail()方法，如-所示

@RequestMapping(value="/sendemail")
public String sendEmail() throws AddressException, MessagingException, IOException {
   sendmail();
   return "Email sent successfully";   
}

注意-发送电子邮件之前，请在您的Gmail帐户设置中启用允许安全性较低的应用。

下面给出了完整的构建配置文件。

maven-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>
<groupId>com.learnfk</groupId>
<artifactId>emailapp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>emailapp</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-mail</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">
  
  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">
  
  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-test</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
     </span><span class="tag">&lt;scope&gt;</span><span class="pln">test</span><span class="tag">&lt;/scope&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

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

Gradle-build.gradle

buildscript {
   ext {
      springBootVersion=1.5.9.RELEASE
   }
   repositories {
      mavenCentral()
   }
   dependencies {
      classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
   }
}
apply plugin: java
apply plugin: eclipse
apply plugin: org.springframework.boot
group=com.learnfk
version=0.0.1-SNAPSHOT
sourceCompatibility=1.8
repositories {
mavenCentral()
}
dependencies {
compile(org.springframework.boot:spring-boot-starter-web)
compile(org.springframework.boot:spring-boot-starter-mail)
testCompile(org.springframework.boot:spring-boot-starter-test)
}

现在，您可以创建一个可执行的JAR文件，并使用下面的-所示的maven或gradle命令运行Spring Boot应用程序

对于maven，您可以使用如下所示的命令-

mvn clean install

在构建成功之后，您可以在目标目录下找到JAR文件。

对于Gradle，您可以使用如下所示的命令-

gradle clean build

在构建成功之后，您可以在build/libs目录下找到JAR文件。

现在，使用下面给出的命令-运行JAR文件

java –jar <JARFILE>

您可以看到应用程序已经在Tomcat端口8080上启动。

现在从您的Web浏览器点击以下URL，您将收到一封电子邮件。

http://localhost:8080/sendemail

无涯教程-Spring Boot - 邮件发送

参考链接