SpringBoot整合RabbitMQ
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作者 | zpk-aaron
来源 | urlify.cn/qM7Bzm
基本配置
1. 创建项目导入依赖
创建SpringBoot项目, 并导入如下依赖: 手动导入
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-amqpartifactId>
dependency>2. application.yml
spring:
rabbitmq:
host: 192.168.64.140 # ip地址/域名
username: admin # 用户名
password: admin # 密码
port: 5672 # 默认为5672端口, 可省略
# virtualHost: /pd # 虚拟路径为了方便测试, 我们可以删掉自动生成的主启动类, 下面每个模式都有一个启动类, 不冲突
简单模式
1. 主程序
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
// Queue的包: org.springframework.amqp.core.Queue
@Bean
public Queue task_queue() {
/*
* 可用以下形式:
* new Queue("helloworld")
* 参数1: 队列名, 参数2: 持久, 参数3: 非排他, 参数4: 非自动删除
* new Queue("helloworld",false,false,false,null)
*/
return new Queue("m1Queue",false);
}
}2. 生产者
AmqpTemplate是rabbitmq客户端API的一个封装工具,提供了简便的方法来执行消息操作.
AmqpTemplate由自动配置类自动创建
package cn.tedu.m1;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class SimpleSender {
@Autowired
AmqpTemplate t;
public void send() {
// 这里向 helloworld 队列发送消息
t.convertAndSend("m1Queue", "Hello world!! "+ System.currentTimeMillis());
System.out.println("消息已发送");
}
}3. 消费者
通过@RabbitListener从指定的队列接收消息, 使用@RebbitHandler注解的方法来处理消息
@RabbitListener注解也可以直接放在方法上, 这样一个类中可以有多个方法进行监听消息
package cn.tedu.m1;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
@RabbitListener(queues = "m1Queue")
public class SimpleReceiver {
@RabbitHandler
public void receive(String msg) {
System.out.println("收到: "+msg);
}
}或者这样写
@Component
public class SimpleReceiver {
@RabbitListener(queues = "helloworld")
public void receive(String msg) {
System.out.println("收到: "+msg);
}
}另外,@RabbitListener 注解中也可以直接定义队列:
@RabbitListener(queuesToDeclare = @Queue(name = "helloworld",durable = "false"))4. 测试类
在存放测试代码的包中,创建测试类
package cn.tedu.m1;
import java.util.Scanner;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class SimpleTests {
@Autowired
SimpleSender simpleSender;
@Test
void test1() throws Exception {
simpleSender.send();
// 便于观察效果, 加入此属性
new Scanner(System.in).nextLine(); // 输入任何字符或回车结束程序
}
}工作模式
1. 主程序
package cn.tedu.m2;
import org.springframework.amqp.core.Queue;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
@Bean
public Queue task_queue() {
return new Queue("m2Queue", false);
}
}2. 生产者
package cn.tedu.m2;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.util.Scanner;
@Component
public class SimpleSender {
@Autowired
private AmqpTemplate t;
public void send() {
while (true) {
System.out.print("输入:");
String s = new Scanner(System.in).nextLine();
//spring 默认将消息的 DeliveryMode 设置为 PERSISTENT 持久化,
t.convertAndSend("m2Queue", s);
}
}
}spring boot封装的 rabbitmq api 中, 发送的消息默认是持久化消息.
如果希望发送非持久化消息, 需要在发送消息时做以下设置:
使用 MessagePostProcessor 前置处理器参数
从消息中获取消息的属性对象
在属性中把 DeliveryMode 设置为非持久化
//如果需要设置消息为非持久化,可以取得消息的属性对象,修改它的deliveryMode属性
t.convertAndSend("task_queue", (Object) s, new MessagePostProcessor() {
@Override
public Message postProcessMessage(Message message) throws AmqpException {
MessageProperties props = message.getMessageProperties();
props.setDeliveryMode(MessageDeliveryMode.NON_PERSISTENT);
return message;
}
});3. 消费者
package cn.tedu.m2;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class SimpleReceiver {
@RabbitListener(queues = "m2Queue")
public void receive(String msg) {
System.out.println("收到1 " + msg);
}
@RabbitListener(queues = "m2Queue")
public void receive2(String msg) {
System.out.println("收到2 " + msg);
}
}4. 测试类
package cn.tedu.m2;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.Scanner;
@SpringBootTest
public class SimpleTests {
@Autowired
private SimpleSender simpleSender;
@Test
void test1() throws Exception {
simpleSender.send();
new Scanner(System.in).nextLine();
}
}ack模式
在 spring boot 中提供了三种确认模式:
NONE - 使用rabbitmq的自动确认
AUTO - 使用rabbitmq的手动确认, springboot会自动发送确认回执 (默认)
MANUAL - 使用rabbitmq的手动确认, 且必须手动执行确认操作
默认的 AUTO 模式中, 处理消息的方法抛出异常, 则表示消息没有被正确处理, 该消息会被重新发送.
设置 ack 模式
spring:
rabbitmq:
listener:
simple:
# acknowledgeMode: NONE # rabbitmq的自动确认
acknowledgeMode: AUTO # rabbitmq的手动确认, springboot会自动发送确认回执 (默认)
# acknowledgeMode: MANUAL # rabbitmq的手动确认, springboot不发送回执, 必须自己编码发送回执手动执行确认操作
如果设置为 MANUAL 模式,必须手动执行确认操作
@RabbitListener(queues="task_queue")
public void receive1(String s, Channel c, @Header(name=AmqpHeaders.DELIVERY_TAG) long tag) throws Exception {
System.out.println("receiver1 - 收到: "+s);
for (int i = 0; i < s.length(); i++) {
if (s.charAt(i) == '.') {
Thread.sleep(1000);
}
}
// 手动发送确认回执
c.basicAck(tag, false);
}抓取数量(qos)
工作模式中, 为了合理地分发数据, 需要将 qos 设置成 1, 每次只接收一条消息, 处理完成后才接收下一条消息.
spring boot 中是通过 prefetch 属性进行设置, 改属性的默认值是 250.
spring:
rabbitmq:
listener:
simple:
prefetch: 1 # qos=1, 默认250发布和订阅模式
1. 主程序
创建 FanoutExcnahge 实例, 封装 fanout 类型交换机定义信息.
spring boot 的自动配置类会自动发现交换机实例, 并在 RabbitMQ 服务器中定义该交换机.
package cn.tedu.m3;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
@Bean
public FanoutExchange fanoutExchange() {
return new FanoutExchange("logs");
}
}2. 生产者
生产者向指定的交换机 logs 发送数据.
不需要指定队列名或路由键, 即使指定也无效, 因为 fanout 交换机会向所有绑定的队列发送数据, 而不是有选择的发送.
package cn.tedu.m3;
import java.util.Scanner;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class Publisher {
@Autowired
AmqpTemplate t;
public void send() {
while (true) {
System.out.print("输入:");
String s = new Scanner(System.in).nextLine();
// 指定向 logs 交换机发送, 不指定队列名或路由键
t.convertAndSend("logs","",s);
}
}
}3. 消费者
消费者需要执行以下操作:
定义随机队列(随机命名,非持久,排他,自动删除)
定义交换机(可以省略, 已在主程序中定义)
将队列绑定到交换机
spring boot 通过注解完成以上操作:
@RabbitListener(bindings = @QueueBinding( //这里进行绑定设置
value = @Queue, //这里定义随机队列,默认属性: 随机命名,非持久,排他,自动删除
exchange = @Exchange(name = "logs", declare = "false") //指定 logs 交换机,因为主程序中已经定义,这里不进行定义
))package cn.tedu.m3;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class Subscriber {
@RabbitListener(bindings = @QueueBinding(value = @Queue, exchange = @Exchange(name = "logs", declare = "false")))
public void receive1(String s) throws Exception {
System.out.println("receiver1 - 收到: "+s);
}
@RabbitListener(bindings = @QueueBinding(value = @Queue, exchange = @Exchange(name = "logs", declare = "false")))
public void receive2(String s) throws Exception {
System.out.println("receiver2 - 收到: "+s);
}
}4. 测试类
package cn.tedu.m3;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class PublishSubscribeTests {
@Autowired
Publisher publisher;
@Test
void test1() throws Exception {
publisher.send();
Thread.sleep(3000); // 为了防止程序执行太快看不到效果
}
}路由模式
与发布和订阅模式代码类似, 只是做以下三点调整:
使用
direct交换机队列和交换机绑定时, 设置绑定键
发送消息时, 指定路由键
1. 主程序
主程序中使用 DirectExcnahge 对象封装交换机信息, spring boot 自动配置类会自动发现这个对象, 并在 RabbitMQ 服务器上定义这个交换机.
package cn.tedu.m4;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
@Bean
public DirectExchange fanoutExchange() {
return new DirectExchange("direct_logs");
}
}2. 生产者
生产者向指定的交换机发送消息, 并指定路由键.
package cn.tedu.m4;
import java.util.Scanner;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class RouteSender {
@Autowired
AmqpTemplate t;
public void send() {
while (true) {
System.out.print("输入消息:");
String s = new Scanner(System.in).nextLine();
System.out.print("输入路由键:");
String key = new Scanner(System.in).nextLine();
// 第二个参数指定路由键
t.convertAndSend("direct_logs",key,s);
}
}
}3. 消费者
消费者通过注解来定义随机队列, 绑定到交换机, 并指定绑定键:
@RabbitListener(bindings = @QueueBinding( // 这里做绑定设置
value = @Queue, // 定义队列, 随机命名,非持久,排他,自动删除
exchange = @Exchange(name = "direct_logs", declare = "false"), // 指定绑定的交换机,主程序中已经定义过队列,这里不进行定义
key = {"error","info","warning"} // 设置绑定键
))package cn.tedu.m4;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class RouteReceiver {
@RabbitListener(bindings = @QueueBinding(value = @Queue,exchange = @Exchange(name = "direct_logs", declare = "false"),key = {"error"}))
public void receive1(String s) throws Exception {
System.out.println("receiver1 - 收到: "+s);
}
@RabbitListener(bindings = @QueueBinding(value = @Queue, exchange = @Exchange(name = "direct_logs", declare = "false"),key = {"error","info","warning"}))
public void receive2(String s) throws Exception {
System.out.println("receiver2 - 收到: "+s);
}
}4. 测试类
package cn.tedu.m4;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class RouteTests {
@Autowired
RouteSender sender;
@Test
void test1() throws Exception {
sender.send();
Thread.sleep(3000); // 为了防止程序执行太快看不到效果
}
}主题模式
主题模式不过是具有特殊规则的路由模式, 代码与路由模式基本相同, 只做如下调整:
使用
topic交换机使用特殊的绑定键和路由键规则
1. 主程序
package cn.tedu.m5;
import org.springframework.amqp.core.TopicExchange;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
@Bean
public TopicExchange fanoutExchange() {
return new TopicExchange("topic_logs");
}
}2. 生产者
package cn.tedu.m5;
import java.util.Scanner;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class TopicSender {
@Autowired
AmqpTemplate t;
public void send() {
while (true) {
System.out.print("输入消息:");
String s = new Scanner(System.in).nextLine();
System.out.print("输入路由键:");
String key = new Scanner(System.in).nextLine();
t.convertAndSend("topic_logs",key,s);
}
}
}3. 消费者
package cn.tedu.m5;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class TopicReceiver {
@RabbitListener(bindings = @QueueBinding(value = @Queue,exchange = @Exchange(name = "topic_logs", declare = "false"),key = {"*.orange.*"}))
public void receive1(String s) throws Exception {
System.out.println("receiver1 - 收到: "+s);
}
@RabbitListener(bindings = @QueueBinding(value = @Queue, exchange = @Exchange(name = "topic_logs", declare = "false"),key = {"*.*.rabbit","lazy.#"}))
public void receive2(String s) throws Exception {
System.out.println("receiver2 - 收到: "+s);
}
}4. 测试类
package cn.tedu.m5;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class TopicTests {
@Autowired
TopicSender sender;
@Test
void test1() throws Exception {
sender.send();
}
}RPC异步调用
1. 主程序
主程序中定义两个队列
发送调用信息的队列:
rpc_queue返回结果的队列: 随机命名
package cn.tedu.m6;
import java.util.UUID;
import org.springframework.amqp.core.Queue;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Main {
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
}
@Bean
public Queue sendQueue() {
return new Queue("rpc_queue",false);
}
@Bean
public Queue rndQueue() {
return new Queue(UUID.randomUUID().toString(), false);
}
}2. 服务端
从rpc_queue接收调用数据, 执行运算求斐波那契数,并返回计算结果.@Rabbitlistener注解对于具有返回值的方法:
会自动获取
replyTo属性自动获取
correlationId属性向
replyTo属性指定的队列发送计算结果, 并携带correlationId属性
package cn.tedu.m6;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
@Component
public class RpcServer {
@RabbitListener(queues = "rpc_queue")
public long getFbnq(int n) {
return f(n);
}
private long f(int n) {
if (n==1 || n==2) {
return 1;
}
return f(n-1) + f(n-2);
}
}3. 客户端
使用 SPEL 表达式获取随机队列名: "#{rndQueue.name}"
发送调用数据时, 携带随机队列名和correlationId
从随机队列接收调用结果, 并获取correlationId
package cn.tedu.m6;
import java.util.UUID;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.AmqpTemplate;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;
@Component
public class RpcClient {
@Autowired
AmqpTemplate t;
@Value("#{rndQueue.name}")
String rndQueue;
public void send(int n) {
// 发送调用信息时, 通过前置消息处理器, 对消息属性进行设置, 添加返回队列名和关联id
t.convertAndSend("rpc_queue", (Object)n, new MessagePostProcessor() {
@Override
public Message postProcessMessage(Message message) throws AmqpException {
MessageProperties p = message.getMessageProperties();
p.setReplyTo(rndQueue);
p.setCorrelationId(UUID.randomUUID().toString());
return message;
}
});
}
//从随机队列接收计算结果
@RabbitListener(queues = "#{rndQueue.name}")
public void receive(long r, @Header(name=AmqpHeaders.CORRELATION_ID) String correlationId) {
System.out.println("\n\n"+correlationId+" - 收到: "+r);
}
}4. 测试类
package cn.tedu.m6;
import java.util.Scanner;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class TopicTests {
@Autowired
RpcClient client;
@Test
void test1() throws Exception {
while (true) {
System.out.print("求第几个斐波那契数: ");
int n = new Scanner(System.in).nextInt();
client.send(n);
}
}
}粉丝福利：108本java从入门到大神精选电子书领取
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