RabbitMQ02_HelloWorld模型的消息生产和消费

ゝ一纸荒年。 2022-11-22 12:46 122阅读 0赞

**RabbitMQ02\_HelloWorld模型的消息生产和消费**

![在这里插入图片描述][20201104145942684.png_pic_left]

*  **引入RabbitMQ的相关依赖：**

<dependency>
        <groupId>com.rabbitmq</groupId>
        <artifactId>amqp-client</artifactId>
        <version>5.7.2</version>
    </dependency>

*  测试消息生产者：

@Test
    public void testSendMessage() throws IOException, TimeoutException { 
    
        //创建连接mq的连接工厂对象
        ConnectionFactory connectionFactory = new ConnectionFactory();
        //设置连接mq的主机
        connectionFactory.setHost("118.31.106.51");
        //设置端口号
        connectionFactory.setPort(5672);
        //设置连接哪个虚拟主机
        connectionFactory.setVirtualHost("/ems");
        //设置访问虚拟主机的用户名和密码
        connectionFactory.setUsername("ems");
        connectionFactory.setPassword("123456");
        //获取连接对象
        Connection connection = connectionFactory.newConnection();
        //获取连接中的通道
        Channel channel = connection.createChannel();
        //通道绑定对应消息队列，参数1：队列名称（如果不存在则会自动创建）
        //参数2：定义队列特性是否要持久化 参数3：是否独占队列 参数4：是否消费完成后自动删除队列
        //参数5：附加参数
        channel.queueDeclare("hello",false,false,false,null);
        //发布消息
        //参数1：交换机名称 参数2：队列名称 参数3：传递消息的额外参数
        //参数4：消息的具体内容
        channel.basicPublish("", "hello", null, "hello RabbitMQ".getBytes());
        //关闭通道和连接
        channel.close();
        connection.close();
    
    }

*  测试消息消费者

public static void main(String[] args) throws IOException, TimeoutException { 
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("118.31.106.51");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/ems");
        connectionFactory.setUsername("ems");
        connectionFactory.setPassword("123456");
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare("hello", false, false, false, null);
        // 消费消息 参数1：消息队列名称 参数2：开启消息的自动确认机制
        // 参数3：消费时的回调接口
        channel.basicConsume("hello", true, new DefaultConsumer(channel) { 
            //从最后一个参数(body)中取出消息
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                throws IOException { 
                System.out.println("body=="+new String(body));
            }
        });
    
        //如果不关闭通道和连接，主函数将持续消费消息，否则只消费一次消息
        //channel.close();
        //connection.close();
    }

--------------------

*  **代码优化：封装连接工具类**

package com.blu.utils;
    
    import com.rabbitmq.client.Channel;
    import com.rabbitmq.client.Connection;
    import com.rabbitmq.client.ConnectionFactory;
    
    public class RabbitMQUtils { 
    	
    	private static ConnectionFactory connectionFactory;
    	
    	static { 
    		connectionFactory = new ConnectionFactory();
    		connectionFactory.setHost("118.31.106.51");
    		connectionFactory.setPort(5672);
    		connectionFactory.setVirtualHost("/ems");
    		connectionFactory.setUsername("ems");
    		connectionFactory.setPassword("123456");
    	}
    
    	// 定义提供连接对象的方法
    	public static Connection getConnection() { 
    		try { 
    			
    			return connectionFactory.newConnection();
    		} catch (Exception e) { 
    			e.printStackTrace();
    		}
    		return null;
    
    	}
    
    	// 关闭通道和连接的方法
    	public static void closeConnectionAndChannel(Channel channel, Connection connection) { 
    		try { 
    			if(channel!=null) { 
    				channel.close();
    			}
    			if(connection!=null) { 
    				connection.close();
    			}
    		} catch (Exception e) { 
    			e.printStackTrace();
    		}
    		
    	}
    
    }

*  **优化消息生产者：**

@Test
    public void testSendMessage() throws IOException, TimeoutException { 	
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare("hello",false,false,false,null);
        channel.basicPublish("", "hello", null, "hello RabbitMQ".getBytes());
        RabbitMQUtils.closeConnectionAndChannel(channel, connection);
    }

*  **优化消息消费者：**

public static void main(String[] args) throws IOException, TimeoutException { 
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        channel.queueDeclare("hello", false, false, false, null);
        channel.basicConsume("hello", true, new DefaultConsumer(channel) { 
            @Override
            public void handleDelivery(String consumerTag, Envelope envelope, BasicProperties properties, byte[] body)
                throws IOException { 
                System.out.println("body=="+new String(body));
            }
        });
        //RabbitMQUtils.closeConnectionAndChannel(channel, connection);
    }

*  参数补充：

@Test
    public void testSendMessage() throws IOException, TimeoutException { 	
        Connection connection = RabbitMQUtils.getConnection();
        Channel channel = connection.createChannel();
        //参数2：表示允许队列持久化 参数3：是否独占队列 参数4：是否消费完成后自动删除队列
        //参数5：附加参数
        channel.queueDeclare("hello",true,false,false,null);
        //参数1：交换机名称 参数3：传递消息的额外参数(MessageProperties.PERSISTENT_TEXT_PLAIN表示支持消息的持久化)
        channel.basicPublish("", "hello", MessageProperties.PERSISTENT_TEXT_PLAIN, "hello RabbitMQ".getBytes());
        RabbitMQUtils.closeConnectionAndChannel(channel, connection);
    }

[20201104145942684.png_pic_left]: /images/20221120/c8c29b761b3846dcb8e3d439aa454b18.png