创建SpringCloud项目
SpringCloud简介
SpringCloud是目前国内使用最广泛的微服务框架。
SpringCloud集成了各种微服务功能组件,并基于SpringBoot实现了这些组件的自动装配,从而提供了良好的开箱即用体验。
SpringCloud常用组件
1.服务注册发现:Eureka,Nacos,Consul
2.服务远程调用:OpenFeign,Dubbo
3.服务链路追踪:Zipkin,Sleuth
4.统一配置管理:SrpingCloudConfig,Nacos
5.统一网关路由:SpringCloudGateway,Zuul
6.流量控制,降级,保护:Hystix,Sentinel
SpringCloud底层是依赖于SpringBoot,且有版本的兼容关系。如下图:
创建一个SpringCloud项目
1.创建一个Maven项目,CloudDemo作为父级项目。继续创建两个Maven项目,UserDemo和OrderDemo作为子项目。如下图:
2.在CloudDemo中添加进行依赖配置
点击查看代码
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<log4j.version>1.2.17</log4j.version>
<lombok.version>1.18.26</lombok.version>
</properties>
<dependencyManagement>
<dependencies>
<!--springCloud的依赖-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR10</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--springBoot依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.3.12.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--springBoot启动器-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.4</version>
</dependency>
<!--数据库-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.13-SNSAPSHOT</version>
</dependency>
<!--其他常用依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
点击查看代码
<dependencies>
<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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
</dependencies>
点击查看代码
<dependencies>
<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>com.alibaba</groupId>
<artifactId>druid</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.cloudDemo</groupId>
<artifactId>UserDemo</artifactId>
<version>1.0-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.1</version>
</dependency>
</dependencies>
4.依赖配置完成后创建项目结构,以OrderDemo为例:
5.配置yml文件
6.创建两个数据库,tb_user和tb_order。
7.该Demo中使用的是MyBatisPlus框架,需要进行实体类与表之间的映射
点击查看代码
@Data
@TableName(value = "tb_order")
public class Order {
private Long id;
private Long userId;
private String name;
private Long price;
private Integer num;
@TableField(exist = false)
private User user;
}
8.在OrderDemo的启动类中添加如下代码,注册一个RestTemplate实例可实现远程调用
点击查看代码
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
9.编写Controller层代码
点击查看代码
@RestController
@RequestMapping("/order")
public class OrderController {
@Autowired
private OrderService orderService;
@Autowired
private RestTemplate restTemplate;
@GetMapping("{id}")
public Order getOrder(@PathVariable("id") Long id){
Order order = orderService.getById(id);
//查询user
String url="http://127.0.0.1:9096/user/"+order.getUserId();//查询url地址
User user = restTemplate.getForObject(url, User.class);//发起调用
order.setUser(user);//存入order
return order;
}
}
10.启动Userdemo和OrderDemo,并访问。
分类:
SpringCloud
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