jms | 易学教程

ActiveMQ简述

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概述 ActiveMQ是Apache所提供的一个开源的消息系统，全然採用Java来实现。因此。它能非常好地支持J2EE提出的JMS（Java Message Service,即Java消息服务）规范。 JMS是一组Java应用程序接口。它提供消息的创建、发送、读取等一系列服务。JMS提供了一组公共应用程序接口和响应的语法。相似于Java数据库的统一訪问接口JDBC,它是一种与厂商无关的API，使得Java程序能够与不同厂商的消息组件非常好地进行通信。 JMS支持两种消息发送和接收模型。一种称为P2P(Ponit to Point)模型。即採用点对点的方式发送消息。P2P模型是基于队列的，消息生产者发送消息到队列。消息消费者从队列中接收消息，队列的存在使得消息的异步传输称为可能，P2P模型在点对点的情况下进行消息传递时採用。还有一种称为Pub/Sub(Publish/Subscribe，即公布-订阅)模型，公布-订阅模型定义了怎样向一个内容节点公布和订阅消息，这个内容节点称为topic(主题)。主题能够觉得是消息传递的中介，消息公布这将消息公布到某个主题，而消息订阅者则从主题订阅消息。主题使得消息的订阅者与消息的公布者互相保持独立。不须要进行接触就可以保证消息的传递，公布-订阅模型在消息的一对多广播时採用。 ActiveMQ的安装下载最新的安装包apache-activemq-5

JMS【三】--ActiveMQ简单的HelloWorld实例

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第一篇博文 JMS【一】--JMS基本概念，我们介绍了JMS的两种消息模型：点对点和发布订阅模型，以及消息被消费的两个方式：同步和异步，JMS编程模型的对象，最后说了JMS的优点。第二篇博文 JMS【二】--ActiveMQ简单介绍以及安装，我们介绍了消息中间件ActiveMQ，安装，启动，以及优缺点。这篇博文，我们使用ActiveMQ为大家实现一种点对点的消息模型。如果你对点对点模型的认识较浅，可以看一下第一篇博文的介绍。 JMS其实并没有想象的那么高大上，看完这篇博文之后，你就知道什么叫简单，下面直接进入主题。 1、开发环境　　我们使用的是ActiveMQ 5.11.1 Release的Windows版，官网最新版是ActiveMQ 5.12.0 Release，大家可以自行下载，下载地址。　　需要注意的是，开发时候，要将apache-activemq-5.11.1-bin.zip解压缩后里面的activemq-all-5.11.1.jar包加入到classpath下面，这个包包含了所有jms接口api的实现。 2、搭建开发环境建立项目我们只需要建立一个java项目就可以了，导入jar包，项目截图：　　点对点的消息模型，只需要一个消息生成者和消息消费者，下面我们编写代码。编写生产者 1 package com.tgb.activemq; 2 3

jms message interceptor

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问题 Is there anyway to intercept messages going to/from a java app and an activeMQ queue? Any opensource utilities I can avail of? Thanks Damien 回答1: You can use aspect-oriented programming. But it does beg the question: why would you want to do this? Logging, monitoring, alerting? Those are all cross-cutting concerns that AOP can address. 来源： https://stackoverflow.com/questions/4114187/jms-message-interceptor

Complete Async web service communication - sender and receiver are not available same time

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问题 Two systems are talking to each other through integration(Using apache-camel). Let say system A needs to submit a request to System B which has exposed a web service to receive data and integration is transforming data as per system B web service. In above scenario A and B has to be available same time and A will have to wait for response from B. I need to remove this dependency by putting queue at integration layer and with Async communication. Ex: <camel:route id="AtoIntegration"> <camel

NAT router blocking JMS messages

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问题 I have an openjms-0-7-7 instance running on my cloud machine. The connection to the jms topic happens over tcp. I run the client application on my personal computer at home and I am able to send messages to the topic (which then get forwarded correctly to other listeners) but I am unable to receive messages. My PC is connected to the internet through a NAT router. I have tried to reproduce this issue using my university network and it all worked fine (there I am assigned my own external IP

What is a “transactional unit of work” in plain english?

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问题 This question follows directly from a previous question of mine in SO. I am still unable to grok the concept of JMS sessions being used as a transactional unit of work . From the Java Message Service book : The QueueConnection object is used to create a JMS Session object (specifically, a Queue Session), which is the working thread and transactional unit of work in JMS. Unlike JDBC, which requires a connection for each transactional unit of work, JMS uses a single connection and multiple

Error while creating JMS configuration in wso2esb

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问题 I'm using wso2esb4.7.0 and wso2mb-2.2.0. I wish to create jms proxy service using wso2mb. For this i have configured the wso2mb as well as wso2esb like : Wso2esb configuration : (changes in jndi.properties) # register some connection factories # connectionfactory.[jndiname] = [ConnectionURL] connectionfactory.QueueConnectionFactory = amqp://admin:admin@clientID/carbon?brokerlist='tcp://localhost:5673' connectionfactory.TopicConnectionFactory = amqp://admin:admin@clientID/carbon?brokerlist=

Error while creating JMS configuration in wso2esb

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JMS encoded message selector not matching when using special characters

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问题 I have 2 applications (client and server) using a request-reply pattern. The client sends a request to the server the message ID is set to something like this: ID=Hostname-52991-1357677886768-3:1:2:1:1 . Now the client has to listen to a message with a correlation ID set to the same value. Since the value contains special characters (:) I have to encode the value (using UTF-8). Sets the JMS Selector, which is an SQL 92 predicate that is used to filter messages within the broker. You may have

How to get Spring to wire my JmsComponent

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问题 I am writing an application using Akka, Akka-Camel and Spring for configuration. The application needs to act as a standalone JMS client against a variety of application servers, to which end it needs to set up the JMS connection factory using JNDI. I'm testing this with jBoss. I have the same problem with jBoss 5 and 6 (this seems to be a client-side Spring problem, not related to jBoss). I am configuring the Spring beans with this xml: <beans xmlns="http://www.springframework.org/schema