J2EE之wildfly 实践5 ---分布式服务中的JMS服务访问

实践条件与目标：

　　1.　　分布式服务中主从服务相关配置

　　2.　　从服务中主要代码片段展示

　　3.　　此次使用wildfly10,因为其默认的jms服务是activemq.

  (转载请注明来源:cnblogs coder-fang)

步骤:

• 主服务配置中使用standalone-full.xml启动，其自带activemq模块。
• 使用adduser增加应用程序用户名称为guest,密码为guest,角色为guest,增加应用程序用户ejbuser,密码123。
• 配置文件中找到activemq模块，并修改配置如下:

          <subsystem xmlns="urn:jboss:domain:messaging-activemq:1.0">
              <server name="default">
                  <security-setting name="#">
                      <role name="guest" delete-non-durable-queue="true" create-non-durable-queue="true" consume="true" send="true"/>
                  </security-setting>
                  <address-setting name="#" message-counter-history-day-limit="10" page-size-bytes="2097152" max-size-bytes="10485760" expiry-address="jms.queue.ExpiryQueue" dead-letter-address="jms.queue.DLQ"/>
                  <http-connector name="http-connector" endpoint="http-acceptor" socket-binding="http"/>
                  <http-connector name="http-connector-throughput" endpoint="http-acceptor-throughput" socket-binding="http">
                      <param name="batch-delay" value="50"/>
                  </http-connector>
                  <in-vm-connector name="in-vm" server-id="0"/>
                  <http-acceptor name="http-acceptor" http-listener="default"/>
                  <http-acceptor name="http-acceptor-throughput" http-listener="default">
                      <param name="batch-delay" value="50"/>
                      <param name="direct-deliver" value="false"/>
                  </http-acceptor>
                  <in-vm-acceptor name="in-vm" server-id="0"/>
                  <jms-queue name="ExpiryQueue" entries="java:/jms/queue/ExpiryQueue"/>
                  <jms-queue name="DLQ" entries="java:/jms/queue/DLQ"/>
                  <jms-queue name="ticketqueue" entries="java:jboss/exported/jms/queue/ticketqueue"/>
                  <connection-factory name="InVmConnectionFactory" entries="java:/ConnectionFactory" connectors="in-vm"/>
                  <connection-factory name="RemoteConnectionFactory" entries="java:jboss/exported/jms/RemoteConnectionFactory" connectors="http-connector"/>
                  <pooled-connection-factory name="activemq-ra" transaction="xa" entries="java:/JmsXA java:jboss/DefaultJMSConnectionFactory" connectors="in-vm"/>
              </server>
          </subsystem>

  注意：我们这里创建的ticketqueue，必须使用java:jboss/exported/格式的jndi，否则外部机器无法访问

• 编写ticketqueue的MDB，并部署到主服务器中，主要代码如下:

  @MessageDriven(name = "TicketBooked", activationConfig = {
          @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
          @ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "java:jboss/jms/queue/ticketqueue") })
  public class TicketBookedMsg implements MessageListener {
  
      private final static Logger logger = Logger.getLogger(TicketBookedMsg.class);
  
      /**
       * Default constructor.
       */
      public TicketBookedMsg() {
          // TODO Auto-generated constructor stub
      }
  
      /**
       * @see MessageListener#onMessage(Message)
       */
      public void onMessage(Message message) {
          // TODO Auto-generated method stub
          try {
              final String text = message.getBody(String.class);
              logger.info("Received    message    " + text);
          } catch (JMSException ex) {
              logger.error("onmsg error" + ex.toString());
          }
  
      }

• 从服务器可以使用standalone.xml启动，即默认的启动配置，在此配置文件中修改此处:

      <subsystem xmlns="urn:jboss:domain:naming:2.0">
              <bindings>
                  <external-context name="java:global/JmsServer" module="org.jboss.as.naming" class="javax.naming.InitialContext" cache="true">
                      <environment>
                          <property name="java.naming.factory.initial" value="org.jboss.naming.remote.client.InitialContextFactory"/>
                          <property name="java.naming.provider.url" value="http-remoting://192.168.50.123:8080"/>
                          <property name="java.naming.security.principal" value="ejbuser"/>
                          <property name="java.naming.security.credentials" value="123"/>
                      </environment>
                  </external-context>
              </bindings>
              <remote-naming/>
          </subsystem>

  注：此配置增加了一个外部context上下文环境，即访问远程主机jndi的context.

• 编写从主机相关服务代码，片段如下:

  Context jmsctx = (InitialContext)context.lookup("java:global/JmsServer");
      Destination    queue = (Queue)jmsctx .lookup("jms/queue/ticketqueue");
      ActiveMQConnectionFactory    cf=(ActiveMQConnectionFactory)jmsctx .lookup("jms/RemoteConnectionFactory");    
          cf.setCallTimeout(3000);
      JMSContext    jmsCtx=cf.createContext("guest", "guest");
  jmsCtx.createProducer().send(queue, "ui started");

• 将写有此代码的服务部署到从服务器中，并调用。
• 在主服务器中显示如下:

  09:37:50,032 INFO  [com.sanjian.handmsg.TicketBookedMsg] (Thread-96 (ActiveMQ-client-global-threads-30092228)) Received message ui started

• 致此，wildfly10中分布式服务的jms通信主要框架已实践完成。