ActiveMQ利用ajax收发消息
准备工作:
后台需要导包:
activemq-all.jar
activemq-web.jar
jetty-all.jar
如果是maven项目:
pom.xml
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-all</artifactId>
<version>5.8.0</version>
</dependency>
<dependency>
<groupId>org.apache.activemq</groupId>
<artifactId>activemq-web</artifactId>
<version>5.8.0</version>
</dependency>
修改配置:
web.xml配置,主要是配置接收客户端请求的servlet
<context-param>
<param-name>org.apache.activemq.brokerURL</param-name>
<param-value>tcp://localhost:61616</param-value>
<description>连接到消息中间件的URL</description>
</context-param>
<servlet>
<servlet-name>AjaxServlet</servlet-name>
<servlet-class>org.apache.activemq.web.AjaxServlet</servlet-class>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>AjaxServlet</servlet-name>
<url-pattern>/amq/*</url-pattern>
</servlet-mapping>
说明:
<url-pattern>/amq/*</url-pattern>,配置会在amq.js发送消息时请求的servlet的rul,在amq.js初始化时要做响应的配置.
<load-on-startup>1</load-on-startup>表示这个servlet在tomcat启动时就实例化
<async-supported>true</async-supported>
servlet3.0新增异步处理支持<async-supported>true</async-supported>有时候会报
java.lang.IllegalStateException: A filter or servlet of the current chain does not support asynchronous operations. 错误,
解决方法: 再所有的servlet和filter中都声明asyncSupported=true。
js的引用:
1.需要引入3个js 需要在网站下
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/amq_jquery_adapter.js"></script>
<script type="text/javascript" src="js/amq.js"></script>
2.amq.js需要初始化
<script type="text/javascript">
$(document).ready(
function()
{
org.activemq.Amq.init(
{
uri: 'amq',
logging: true,
timeout: 1,
clientId:(new Date()).getTime().toString()
}
);
});
</script>
$(function(){
//mq初始化
var amq = org.activemq.Amq;
var myDestination='topic://test.topic';//test.topic为topic的名称
amq.init({
uri: 'amq', //AjaxServlet所配置对应的URL
logging: true,//激活日志记录
timeout: 20,//保持连接时长,单位为秒
clientId:(new Date()).getTime().toString() //防止多个浏览器窗口标签共享同一个JSESSIONID
});
//发送消息
$("#sendBtn").click(function(){
var msg=$("#msg").val();
var name=$("#name").val();
amq.sendMessage(myDestination, "<message name='"+name+"' msg='"+msg+"'/>");
$("#msg").val("");
});
//接收消息
rcvMessage: function(message){
$("#mqNum").text(message.data);
// $("#distext").append(message.getAttribute('name')+":"+message.getAttribute('msg')+"\n");
console.log(list);
}
};
//注册消息处理器
amq.addListener('handler',myDestination,myHandler.rcvMessage);
});