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  • rabbit的简单搭建,java使用rabbitmq queue的简单例子和一些坑

    一 整合

    由于本人的码云太多太乱了,于是决定一个一个的整合到一个springboot项目里面。

    附上自己的项目地址https://github.com/247292980/spring-boot

    以整合功能

    spring-boot,FusionChart,thymeleaf,vue,ShardingJdbc,mybatis-generator,微信分享授权,drools,spring-security,spring-jpa,webjars,Aspect,drools-drt

    这次就来整合下简单的rabbitmq

    二 安装

    这玩意最坑的地方在于,百度第一的安装教程,缺了一部分。

    1.安装erlong,搭建环境变量
    2.安装mq
    3.这里他有一个mq管理插件的东西,我只想说这玩意很老了,新的mq基本都自己装了, http://localhost:15672 你能打开就是已经装成功,所以xxx plugin unchange的其实是没有错的。


    或许有人用老板的我也贴一下相应代码,以下所有命令默认cd到mq的sbin目录下

    enable rabbitmq_management


    4.查询用户

    rabbitmqctl.bat list_users

    5.新增一个用户

    rabbitmqctl.bat add_user username password
    例子 rabbitmqctl.bat add_user haha
    123456798

    6.更改角色

    rabbitmqctl.bat set_user_tags username role
    
    例子
    rabbitmqctl.bat set_user_tags haha administrator

    7.改密码

    rabbitmqctl change_password userName newPassword
    
    例子
    rabbitmqctl change_password haha 123456

    8.删除用户

    rabbitmqctl.bat delete_user username
    
    例子
    rabbitmqctl.bat delete_user haha

    9.设置用户权限

    rabbitmqctl  set_permissions  -p  VHostPath  User  ConfP  WriteP  ReadP
    
    例子 这个例子一定要跑一下,百度第一的照着做会报你没有权限的error,授予用户username在服务器根目录辖所有资源的读写权限
    rabbitmqctl.bat set_permissions -p "/" haha ".*" ".*" ".*"

    10.查看(指定hostpath)所有用户的权限信息

    rabbitmqctl  list_permissions  [-p  VHostPath]

    11.查看指定用户的权限信息

    rabbitmqctl  list_user_permissions  User
    
    例子
    rabbitmqctl  list_user_permissions  haha

    12.清除用户的权限信息

    rabbitmqctl  clear_permissions  [-p VHostPath]  User
    
    例子
    rabbitmqctl  clear_permissions  [-p VHostPath]  haha

    13.在写demo之前,我们还要做一个事情,添加一个队列,进入http://localhost:15672点击queues标签即能看到

    三 代码

    生产者

    /**
     * @AUTHOR lgp
     * @DATE 2018/9/7 17:27
     * @DESCRIPTION rabbitmq的消息生产者
     **/
    public class Producer {
        public final static String QUEUE_NAME = "rabbitMQ.lgp";
        public static final Logger log = LoggerFactory.getLogger(Producer.class);
    
        public static void main(String[] args) throws IOException, TimeoutException {
            //创建连接工厂
            ConnectionFactory factory = new ConnectionFactory();
            //设置RabbitMQ相关信息
            factory.setHost("localhost");
            factory.setUsername("haha");
            factory.setPassword("123456789");
            factory.setPort(5672);
            //创建一个新的连接
            try (Connection connection = factory.newConnection();
                 Channel channel = connection.createChannel()) {
                //创建一个通道
                //  声明一个队列
    //            public com.rabbitmq.client.AMQP.Queue.DeclareOk queueDeclare(String queue, boolean durable, boolean exclusive, boolean autoDelete, Map<String, Object> arguments) throws IOException
                boolean durable = true;
                boolean exclusive = false;
                boolean auto_delete = false;
    //            Map<String, Object> arguments = new HashMap<String, Object>();
    //            // 统一设置队列中的所有消息的过期时间
    //            arguments.put("x-message-ttl", 30000);
    //            // 设置超过多少毫秒没有消费者来访问队列,就删除队列的时间
    //            arguments.put("x-expires", 20000);
    //            // 设置队列的最新的N条消息,如果超过N条,前面的消息将从队列中移除掉
    //            arguments.put("x-max-length", 4);
    //            // 设置队列的内容的最大空间,超过该阈值就删除之前的消息
    //            arguments.put("x-max-length-bytes", 1024);
    //            // 将删除的消息推送到指定的交换机,一般x-dead-letter-exchange和x-dead-letter-routing-key需要同时设置
    //            arguments.put("x-dead-letter-exchange", "exchange.dead");
    //            // 将删除的消息推送到指定的交换机对应的路由键
    //            arguments.put("x-dead-letter-routing-key", "routingkey.dead");
    //            // 设置消息的优先级,优先级大的优先被消费
    //            arguments.put("x-max-priority", 10);
                channel.queueDeclare(QUEUE_NAME, durable, exclusive, auto_delete, null);
                String message = "Hello RabbitMQ";
                //发送消息到队列中
                channel.basicPublish("", QUEUE_NAME, null, message.getBytes("UTF-8"));
                log.info("Producer Send message={}", message);
                //关闭通道和连接
                channel.close();
            }
    
        }
    }

    消费者

    /**
     * @AUTHOR lgp
     * @DATE 2018/9/7 17:34
     * @DESCRIPTION 消费者
     **/
    public class Customer {
        private final static String QUEUE_NAME = "rabbitMQ.lgp";
        public static final Logger log = LoggerFactory.getLogger(Customer.class);
    
        public static void main(String[] args) throws IOException, TimeoutException {
            // 创建连接工厂
            ConnectionFactory factory = new ConnectionFactory();
            //设置RabbitMQ地址
            factory.setHost("localhost");
            factory.setUsername("haha");
            factory.setPassword("123456789");
            factory.setPort(5672);
            try (Connection connection = factory.newConnection(); Channel channel = connection.createChannel()) {
                //创建一个通道
                //声明要关注的队列
                //队列持久化,在RabbitMQ重启保证队列不会丢失
                boolean durable = true;
                channel.queueDeclare(QUEUE_NAME, true, false, false, null);
                System.out.println("Customer Waiting Received messages");
                //DefaultConsumer类实现了Consumer接口,通过传入一个频道,
                // 告诉服务器我们需要那个频道的消息,如果频道中有消息,就会执行回调函数handleDelivery
                Consumer consumer = new DefaultConsumer(channel) {
                    @Override
                    public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body)
                            throws IOException {
                        String message = new String(body, "UTF-8");
                        log.info("Customer Received message={}", message);
                    }
                };
                //自动回复队列应答 -- RabbitMQ中的消息确认机制
                channel.basicConsume(QUEUE_NAME, true, consumer);
            }
        }
    }

    四 注意点

    1.我为了测试queueDeclare的参数代表的是什么意思,起了什么作用(由于多次测试,也出现了下面这些奇奇怪怪的bug),发现exclusive 和auto_delete的报错都是说auto_delete,但是具体的作用就是不同,所以你懂得...

    2.还有一个谜一样的bug,我能上http://localhost:15672,但是java代码死活不行,那我看看cmd正不正常,然后

    Error: unable to perform an operation on node 'rabbit@haha'. Please see diagnostics information and suggestions below.

    Most common reasons for this are:

     * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
     * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
     * Target node is not running

    In addition to the diagnostics info below:

     * See the CLI, clustering and networking guides on http://rabbitmq.com/documentation.html to learn more
     * Consult server logs on node rabbit@haha

    DIAGNOSTICS
    ===========

    attempted to contact: [rabbit@haha]

    rabbit@haha:
      * connected to epmd (port 4369) on haha
      * epmd reports node 'rabbit' uses port 25672 for inter-node and CLI tool traffic
      * TCP connection succeeded but Erlang distribution failed

      * Hostname mismatch: node "rabbit@xxxx" believes its host is different. Please ensure that hostnames resolve the same way locally and on "rabbit@xxxx"


    Current node details:
     * node name: rabbitmqcli30@haha
     * effective user's home directory: C:Usersxxxx
     * Erlang cookie hash: 0rVZh7WgaAP8H8hmZPiGLA==

    就是说,node没创建?我都用haha登上你的web管理系统啊???

    这报错莫名其妙的出现了我电脑的名字,,,,

    看情况就是node rabbit@xxxx这玩意是mq底层取参数,取到了电脑的名字去了?然后两个mabbit都启动erlang,erlang抢夺端口的error??

    解决方法 删除所有mq线程,重启mq

    3.同样是一个谜一样的bug,启动rabbit成功,但是java还是不同跑

    Error: unable to perform an operation on node 'rabbit@haha'. Please see diagnostics information and suggestions below.
    
    Most common reasons for this are:
    
     * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
     * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
     * Target node is not running
    
    In addition to the diagnostics info below:
    
     * See the CLI, clustering and networking guides on http://rabbitmq.com/documentation.html to learn more
     * Consult server logs on node rabbit@haha
    
    DIAGNOSTICS
    ===========
    
    attempted to contact: [rabbit@haha]
    
    rabbit@haha:
      * connected to epmd (port 4369) on haha
      * epmd reports: node 'rabbit' not running at all
                      no other nodes on haha
      * suggestion: start the node
    
    Current node details:
     * node name: rabbitmqcli26@haha
     * effective user's home directory: C:Usersxxxx
     * Erlang cookie hash: 0rVZh7WgaAP8H8hmZPiGLA==

    node没有创建,那么不是重启rabbitmq这个层次的问题啊...

    解决方法

    在windows的服务里面重启rabbitmq的服务,出现这问题的原因可能是我开了两个cmd操作rabbitmq,搞到erlang线程死锁了,,,,

    4.代码里我只写了mq的简单应用,比较核心的如分发,订阅等我都没有写,因为用过mq的都知道,这些东西其实都是一样的简单的(像我测试queueDeclare那样一个一个改一个一个看具体作用,好蠢是不是...),主要是设计思路.所以我就不写其他的例子,只写了消息队列中的简单队列。

    5.这个是上面两个的低配版。error node with name "rabbit" already running on “xxxxxxx”

    一看就知道重启mq就行了

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  • 原文地址:https://www.cnblogs.com/ydymz/p/9617905.html
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