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java - 如何打印使用 Spring Message 捕获的电子邮件正文内容

问题描述

我正在研究这个Spring 邮件示例。这段代码的作用是每次有新邮件到达 Gmail 收件箱时都会打印消息。

package org.springframework.integration.samples.mail.imapidle;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.integration.channel.DirectChannel;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;


/**
 * @author Oleg Zhurakousky
 * @author Gary Russell
 *
 */
public class GmailInboundImapIdleAdapterTestApp {
    private static Log logger = LogFactory.getLog(GmailInboundImapIdleAdapterTestApp.class);


    public static void main (String[] args) throws Exception {
        @SuppressWarnings("resource")
        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext(
                "/META-INF/spring/integration/gmail-imap-idle-config.xml");
        DirectChannel inputChannel = ac.getBean("receiveChannel", DirectChannel.class);
        inputChannel.subscribe(new MessageHandler() {
            public void handleMessage(Message<?> message) throws MessagingException {
                logger.info("Message: " + message);
            }
        });
    }
}

我发送了 2 封电子邮件，最终这些行出现在 Eclipse 控制台上：

16:04:52.851 INFO [pool-2-thread-1][org.springframework.integration.samples.mail.imapidle.GmailInboundImapIdleAdapterTestApp] 消息：GenericMessage [payload=org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage@4ac650aa， headers={id=869e46a9-8fd0-4351-4f1e-bb181286b05f，timestamp=1570611892844}] 16:09:31.063 INFO [pool-2-thread-1][org.springframework.integration.samples.mail.imapidle.GmailInboundImapIdleAdapterTestApp]消息：GenericMessage [payload=org.springframework.integration.mail.AbstractMailReceiver$IntegrationMimeMessage@76114690, headers={id=6c791751-668e-69c5-3e05-1ae1ec72f853, timestamp=1570612171063}]

现在如何检索正文内容？例如，邮件正文上是“hello world 123”？

标签： javaspringgmail

解决方案

通过访问您正在记录的对象的文档（Message接口）[0]，您将找到一个getPayload方法，该方法将返回实际有效负载Message：

T getPayload()

返回消息有效负载。

此有效负载对象可能具有检索电子邮件数据的方法。在您的情况下，有效负载是IntegrationMimeMessage[1]，它扩展MimeMessage并具有getContent方法 [2]。所以你应该能够做这样的事情：

logger.info("Message content: " + message.getPayload().getContent());

[0] https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/messaging/Message.html

[1] https://github.com/spring-projects/spring-integration/blob/master/spring-integration-mail/src/main/java/org/springframework/integration/mail/AbstractMailReceiver.java#L646

[2] https://docs.oracle.com/javaee/6/api/javax/mail/internet/MimeMessage.html#getContent()

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