package com.mes.common;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.rabbitmq.client.*;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.BlockingQueue;
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public class RabbitMQUtils {
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// ObjectMapper对象，用于序列化和反序列化JSON
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private static ObjectMapper objectMapper = new ObjectMapper();
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private static String host = "10.153.19.150"; // RabbitMQ 主机名
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private static Map<String, Object> args = new HashMap<>(); // 队列参数
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static {
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// 设置队列参数
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args.put("x-max-length-bytes", 1024 * 1024);
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}
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// private static Map<String, Object> args = new HashMap<>();
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// args.put("x-max-length-bytes",1024 * 1024);
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// 发送消息到 RabbitMQ 队列中
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public String sendMessage(String message, String queueName) throws Exception {
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// 创建连接工厂并设置主机名
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost(host);
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// 使用 try-with-resources 语句创建连接和通道，并发送消息
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try (Connection connection = factory.newConnection();
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Channel channel = connection.createChannel()) {
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// 声明队列
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channel.queueDeclare(queueName, false, false, false, args);
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// 发布消息到队列
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channel.basicPublish("", queueName, null, message.getBytes("UTF-8"));
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System.out.println(" [x] Sent '" + message + "' to queue '" + queueName + "'");
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}
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return message;
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}
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// 从 RabbitMQ 队列中接收消息
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public String receiveMessage(String queueName) throws Exception {
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// 创建连接工厂并设置主机名
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost(host);
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// 创建阻塞队列
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BlockingQueue<String> messageQueue = new ArrayBlockingQueue<>(1);
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// 使用 try-with-resources 语句创建连接和通道，并接收消息
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try (Connection connection = factory.newConnection();
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Channel channel = connection.createChannel()) {
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// 声明队列
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channel.queueDeclare(queueName, false, false, false, args);
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// 设置消息接收回调
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DeliverCallback deliverCallback = (consumerTag, delivery) -> {
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String receivedMessage = new String(delivery.getBody(), "UTF-8");
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// System.out.println(" [x] Received '" + receivedMessage + "'");
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// 将接收到的消息放入阻塞队列
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try {
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messageQueue.put(receivedMessage);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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};
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// 消费队列中的消息
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channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
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});
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// 阻塞并等待获取消息
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return messageQueue.take();
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}
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}
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public List<String> readMessages(String queueName,boolean is) throws Exception {
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost(host);
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List<String> messages = new ArrayList<>();
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try (Connection connection = factory.newConnection();
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Channel channel = connection.createChannel()) {
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boolean autoAck = false;
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GetResponse response = channel.basicGet(queueName, autoAck);
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if (response != null) {
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String message = new String(response.getBody(), "UTF-8");
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messages.add(message);
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// 手动确认消息处理完成
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if(is){
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long deliveryTag = response.getEnvelope().getDeliveryTag();
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channel.basicAck(deliveryTag, false);
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}
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}
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}
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return messages;
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}
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// 发送 JSON 消息到队列
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public static boolean sendJsonMessage(Object message, String queueName) throws Exception {
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// 创建连接工厂并设置主机名
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost(host);
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// 使用 try-with-resources 语句创建连接和通道，并发送 JSON 消息
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try (Connection connection = factory.newConnection();
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Channel channel = connection.createChannel()) {
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// 声明队列
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channel.queueDeclare(queueName, false, false, false, args);
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// 将对象转换为 JSON 字符串
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String jsonMessage = objectMapper.writeValueAsString(message);
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// 发布 JSON 消息到队列
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channel.basicPublish("", queueName, null, jsonMessage.getBytes());
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System.out.println(" [x] Sent JSON message: '" + jsonMessage + "' to queue '" + queueName + "'");
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return true; // 发送消息成功
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} catch (Exception e) {
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e.printStackTrace();
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return false; // 发送消息失败
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}
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}
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// 接收 JSON 消息并转换为对象
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public static <T> T receiveJsonMessage(Class<T> valueType, String queueName) throws Exception {
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// 创建连接工厂并设置主机名
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost(host);
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// 使用 try-with-resources 语句创建连接和通道，并接收 JSON 消息
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try (Connection connection = factory.newConnection();
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Channel channel = connection.createChannel()) {
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// 声明队列
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channel.queueDeclare(queueName, false, false, false, args);
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// 获取队列中的消息
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GetResponse response = channel.basicGet(queueName, true);
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if (response != null) {
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byte[] body = response.getBody();
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String jsonMessage = new String(body, "UTF-8");
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System.out.println(" [x] Received JSON message: '" + jsonMessage + "' from queue '" + queueName + "'");
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// 将 JSON 消息转换为对象
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return objectMapper.readValue(jsonMessage, valueType);
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} else {
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return null;
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}
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} catch (Exception e) {
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e.printStackTrace();
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return null; // 接收消息失败
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}
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}
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}
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// RabbitMQUtils.sendMessage("Hello, world!", "module_queue");
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//RabbitMQUtils.receiveMessage("module_queue");
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//RabbitMQUtils.sendJsonMessage(someObject, "another_queue");
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//RabbitMQUtils.receiveJsonMessage(SomeClass.class, "another_queue");
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// 需要将 someObject 替换为你要发送的对象，并将 SomeClass 替换为你要接收并转换的对象类型。
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