SpringBoot整合RabbitMQ(二)单机抢票系统@慕课网原创_慕课网

在这个项目里我用的是 springboot的2版本，ORM选用 JPA快速开发，JSON工具使用阿里的 fastjson，当然，mq用的是 rabbitMQ。导入的是 springboot集成的依赖。

1. 配置部分

1.1 pom.xml

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.18</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>

1.2 application.properties

server.port=10000
spring.datasource.url=jdbc:mysql://xxxxx/xxxxx?characterEncoding=utf-8
spring.datasource.username=xxx
spring.datasource.password=xxxx
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.show-sql=true
spring.rabbitmq.host=localhost
spring.rabbitmq.username=root
spring.rabbitmq.password=root
spring.rabbitmq.port=5672

我只是很有针对性的对 mq和 datasource进行了配置。

1.3 数据表

create table if not result
(
id int auto_increment primary key,
ticket_id int null,
user_id int null
);
create table if not exists ticket
(
id int auto_increment primary key,
name varchar(255) null,
content varchar(255) null,
user_name varchar(20) null,
count int default '6666' not null
);

根据数据表可以Generate出JavaBean，不贴JavaBean了。 ##### 1.4 项目架构

├── src│   ├── main│   │   ├── java│   │   │   └── com│   │   │       └── fantj│   │   │           └── springbootjpa│   │   │               ├── AMQP.java│   │   │               ├── controller│   │   │               │   └── TicketController.java│   │   │               ├── mq│   │   │               │   ├── Message.java│   │   │               │   ├── MQConstants.java│   │   │               │   ├── MQReceiver.java│   │   │               │   └── MQSender.java│   │   │               ├── pojo│   │   │               │   ├── Result.java│   │   │               │   └── Ticket.java│   │   │               ├── repostory│   │   │               │   ├── ResultRepository.java│   │   │               │   └── TicketRepository.java│   │   │               └── service│   │   │                   ├── ResultServiceImpl.java│   │   │                   ├── ResultService.java│   │   │                   ├── TicketServiceImpl.java│   │   │                   └── TicketService.java│   │   └── resources│   │       ├── application.properties│   │       └── rebel.xml

2. 启动类

@SpringBootApplication@EntityScan("com.fantj.springbootjpa.pojo")@EnableRabbitpublic class AMQP {    public static void main(String[] args) {        SpringApplication.run(AMQP.class, args);    }}

注意这个 @EnableRabbit注解，它会开启对rabbit注解的支持。

3. controller

很简单的一个controller类，实现查询和抢票功能。

@RestController
@RequestMapping("/ticket")
public class TicketController {
@Autowired
private TicketService ticketService;
@Autowired
private MQSender mqSender;
@RequestMapping("/get/{id}")
public Ticket getByid(@PathVariable Integer id){
return ticketService.findById(id);
}
@RequestMapping("/reduce/{id}/{userId}")
public String reduceCount(@PathVariable Integer id,
@PathVariable Integer userId){
Message message = new Message(id,userId);
ticketService.reduceCount(id);
mqSender.sendMessage(new Message(message.getTicketId(),message.getUserId()));
return "抢票成功!";
}
}

注意 privateMQSendermqSender;这是我的 rabbit发送消息的类。

4. Service

接口我就不再这里贴出，直接贴实现类。
4.1 ResultServiceImpl.java

@Service
public class ResultServiceImpl implements ResultService{
@Autowired
private ResultRepository resultRepository;
@Override
public void add(Result result) {
resultRepository.add(result.getTicketId(), result.getUserId());
}
@Override
public Result findOneByUserId(Integer userId) {
return resultRepository.findByUserId(userId);
}
}

4.2 TicketServiceImpl.java

@Service
public class TicketServiceImpl implements TicketService{
@Autowired
private TicketRepository repository;
@Override
public Ticket findById(Integer id) {
return repository.findTicketById(id);
}
@Override
public Ticket reduceCount(Integer id) {
repository.reduceCount(id);
return findById(id);
}
}

这两个都是很普通的service实现类，没有新加入的东西。

5. Dao

5.1 ResultRepository.java

@Repository
public interface ResultRepository extends JpaRepository<Result,Integer> {
@Transactional
@Modifying
@Query(value = "insert into result(ticket_id,user_id) values(?1,?2) ",nativeQuery = true)
void add(@Param("ticketId") Integer ticketId,@Param("userId") Integer userId);
Result findByUserId(Integer userId);
}

5.2 TicketRepository.java

@Repositorypublic interface TicketRepository extends JpaRepository<Ticket,Integer>{    /**     *  减少库存     */    @Transactional    @Modifying    @Query(value = "update ticket t set t.count=t.count+(-1) where id=?1",nativeQuery = true)    int reduceCount(Integer id);    /**     * 查询信息     */    Ticket findTicketById(Integer id);}

到了这里，你会发现，md哪里有用mq的痕迹...