spring boot admin 监控服务

重写spring boot的邮件通知服务

原理

查阅源码可以看到 邮件发送是调用了MailSender的实现类,在org.springframework.mail.javamail包中JavaMailSenderImpl实现了该接口,

@Configuration
@ConditionalOnBean(MailSender.class)
@AutoConfigureAfter({ MailSenderAutoConfiguration.class })
@AutoConfigureBefore({ NotifierListenerConfiguration.class,
CompositeNotifierConfiguration.class })
public static class MailNotifierConfiguration {
@Autowired
private MailSender mailSender;
@Bean
@ConditionalOnMissingBean
@ConfigurationProperties("spring.boot.admin.notify.mail")
public MailNotifier mailNotifier() {
return new MailNotifier(mailSender);
}
}

继续查阅JavaMailSenderImpl的配置文件代码可以看到JavaMailSenderImpl的注册配置中启用了@ConditionalOnMissingBean(MailSender.class)这个注解,所以只要重新写代码实现MailSender接口就可以替代原有的邮件发送代码

@Configuration
@ConditionalOnClass({ MimeMessage.class, MimeType.class })
@ConditionalOnMissingBean(MailSender.class)
@Conditional(MailSenderCondition.class)
@EnableConfigurationProperties(MailProperties.class)
@Import(JndiSessionConfiguration.class)
public class MailSenderAutoConfiguration {
private final MailProperties properties;
private final Session session;
public MailSenderAutoConfiguration(MailProperties properties,
ObjectProvider<Session> session) {
this.properties = properties;
this.session = session.getIfAvailable();
}
@Bean
public JavaMailSenderImpl mailSender() {
JavaMailSenderImpl sender = new JavaMailSenderImpl();
if (this.session != null) {
sender.setSession(this.session);
}
else {
applyProperties(sender);
}
return sender;
}
//....省略代码
}

实现

以下是具体的实现代码

import com.google.gson.Gson;
import jodd.http.HttpRequest;
import jodd.http.HttpResponse;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.stereotype.Component;
/**
* Created by Rizon on 2018/4/18.
*/
@Component
public class EmailSender implements MailSender {
private final static Logger LOGGER = LoggerFactory.getLogger(EmailSender.class);
@Value("${mail.server.url}")
private String EMAIL_SERVER_URL;
@Override
public void send(SimpleMailMessage simpleMailMessage){
this.send(new SimpleMailMessage[]{simpleMailMessage});
}
@Override
public void send(SimpleMailMessage... simpleMailMessages){
for (SimpleMailMessage simpleMailMessage : simpleMailMessages) {
String to = StringUtils.join(simpleMailMessage.getTo(), ",");
String cc = StringUtils.join(simpleMailMessage.getCc(), ",");
String subject = simpleMailMessage.getSubject();
String body = simpleMailMessage.getText();
doSend(to, cc, subject, body);
}
}
public void doSend(String receiver, String ccAddress, String subject, String body) {
Email email = new Email(receiver, ccAddress, subject, body);
LOGGER.info(String.format("Send-Email-Request: [url=%s, to=%s, subject=%s, body=%s]", EMAIL_SERVER_URL,
email.receiver, email.subject, email.body));
HttpRequest request = HttpRequest.post(EMAIL_SERVER_URL).multipart(true);
HttpResponse response = request
.form("sendEmailInfo", new Gson().toJson(email)).timeout(5000).send();
LOGGER.info(String.format("Send-Email-Response: [response=%s]", response.bodyText()));
}
@Getter
@Setter
@AllArgsConstructor
public static class Email {
private String receiver; //多收件人逗号分隔
private String ccAddress;
private String subject;
private String body;
}
}