配置值MDB注解 [英] Configurable values to MDB annotations

问题描述

我试图使用这种方法在我们EJB3接收邮件应用程序。总之，这意味着与以下注释创建一个MDB：

I'm trying to use this method for receiving mail in our EJB3 app. In short, that means creating an MDB with the following annotations:

@MessageDriven(activationConfig = { @ActivationConfigProperty(propertyName = "mailServer", propertyValue = "imap.company.com"),
    @ActivationConfigProperty(propertyName = "mailFolder", propertyValue = "INBOX"),
    @ActivationConfigProperty(propertyName = "storeProtocol", propertyValue = "imap"),
    @ActivationConfigProperty(propertyName = "debug", propertyValue = "false"),
    @ActivationConfigProperty(propertyName = "userName", propertyValue = "username"),
    @ActivationConfigProperty(propertyName = "password", propertyValue = "pass") })
@ResourceAdapter("mail-ra.rar")
@Name("mailMessageBean")
public class MailMessageBean implements MailListener {
    public void onMessage(final Message msg) {
       ...snip...
    }
}

我有这个工作，但情况不太理想：主机名，用户名和密码是硬codeD。短期使用Ant和build.properties更换编译之前这些价值观，我不知道如何来具体化它们。

I have this working, but the situation is less than ideal: The hostname, username and password are hardcoded. Short of using ant and build.properties to replace those values before compilation, I don't know how to externalize them.

这将是理想的使用一个MBean，但我不知道怎么去从MBean值的MDB配置。

It would be ideal to use an MBean, but I have no idea how to get the values from the MBean to the MDB configuration.

我应该怎么做呢？

推荐答案

您可以外化注释到您在您的jar文件的META-INF部署ejb-jar.xml中，如下所示：

You can externalise the annotations into the ejb-jar.xml that you deploy in the META-INF of your jar file as follows:

<?xml version="1.0" encoding="UTF-8"?>

<ejb-jar version="3.0">
    <enterprise-beans>
    	<message-driven>
            <ejb-name>YourMDB</ejb-name>
            <ejb-class>MailMessageBean</ejb-class>        
    		<activation-config>
    			<activation-config-property>
    			   <activation-config-property-name>username</activation-config-property-name>
    			   <activation-config-property-value>${mdb.user.name}</activation-config-property-value>
    			</activation-config-property>
...
...
            </activation-config>
        </message-driven>
    </enterprise-beans>

然后就可以设置mdb.user.name值作为系统属性作为使用命令行到应用服务器的一部分-Dmdb.user.name = theUserName，它会神奇地得到由MDB回升。

Then you can set the mdb.user.name value as a system property as part of the command line to your application server using -Dmdb.user.name=theUserName and it will magically get picked up by the mdb.

希望有所帮助。

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