我们这次是使用的电商项目的商品、订单、用户为案例进行讲解
在微服务架构中,最常见的场景就是微服务之间的相互调用。我们以电商系统中常见的用户下单为例来 演示微服务的调用:客户向订单微服务发起一下单的请求,在进行保存订单之前需要调用商品微服务 查询商品的信息
我们一般把服务的主动调用方称为服务消费者,把服务的被调用方称为服务提供者.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
</parent>
<groupId>com.ityml</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<java.version>1.8</java.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
<spring-cloud-alibaba.version>2.1.0.RELEASE</spring-cloud-alibaba.version>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
对应版本:
https://www.cnblogs.com/onehm/p/13931711.html
在pom中添加依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion><parent>
<groupId>com.ityml</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.ityml</groupId>
<artifactId>shop-common</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.79</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.49</version>
</dependency>
</dependencies>
</project>
创建实体类
/**
* -----------------------------
* PackageName: com.ityml.entity
* ClassName:User
* Description:用户
*
* @author:it-yml CreateTime:2022-03-22
* -----------------------------
*/
@Entity(name = "shop-user")
@Data
public class User {
@Id@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer uid;
private String username;
private String password;
private String telephone;
}
/**
* -----------------------------
* PackageName: com.ityml.entity
* ClassName:Product
* Description:商品
*
* @author:it-yml CreateTime:2022-03-22
* -----------------------------
*/
@Entity(name = "shop-product")
@Data
public class Product {@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private String pname;
private Double price;
private Integer stock;
}
/**
* -----------------------------
* PackageName: com.ityml.entity
* ClassName:Order
* Description:订单
*
* @author:it-yml CreateTime:2022-03-22
* -----------------------------
*/
@Entity(name = "shop-order")
@Data
public class Order {
@Id@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long oid;
private Integer uid;
private String username;
}
步骤:
创建一个shop-user模块,然后进行下面操作
创建pom
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion><parent>
<groupId>com.ityml</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.ityml</groupId>
<artifactId>shop-user</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.ityml</groupId>
<artifactId>shop-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
编写主类
package com.ityml;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* -----------------------------
* PackageName: com.ityml
* ClassName:UserApplication
* Description:启动类
*
* @author:it-yml CreateTime:2022-03-22
* -----------------------------
*/
@SpringBootApplication
public class UserApplication {
public static void main(String[] args) {
SpringApplication.run(UserApplication.class,args);
}
}
创建配置文件
server:
port: 8080
spring:
application:
name: service-user
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc://
username:
data-password:
jpa:
properties:
hibernate:
hbm2ddl:
auto: update
dialect: org.hibernate.dialect.MySQL.5InnoDDialect
创建一个名为shop-product的模块,并添加springboot依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion><parent>
<groupId>com.ityml</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.ityml</groupId>
<artifactId>shop-product</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.ityml</groupId>
<artifactId>shop-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
创建工程主类
package com.ityml;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* -----------------------------
* PackageName: com.ityml
* ClassName:ProductApplication
* Description:商品主类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@SpringBootApplication
public class ProductApplication {
public static void main(String[] args) {
SpringApplication.run(ProductApplication.class,args);
}
}
创建配置文件application.yml
server:
port: 8080
spring:
application:
name: service-product
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc://
username:
data-password:
jpa:
properties:
hibernate:
hbm2ddl:
auto: update
dialect: org.hibernate.dialect.MySQL.5InnoDDialect
创建ProductDao接口
package com.ityml.dao;
import com.ityml.entity.Product;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* -----------------------------
* PackageName: com.ityml.dao
* ClassName:ProductDao
* Description:
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
public interface ProductDao extends JpaRepository<Product,Integer> {
}
创建ProductService接口和实现类
package com.ityml.service;
import com.ityml.entity.Product;
/**
* -----------------------------
* PackageName: com.ityml.service
* ClassName:ProductService
* Description:
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
public interface ProductService {
Product findById(Integer pid);
}
package com.ityml.impl;
import com.ityml.dao.ProductDao;
import com.ityml.entity.Product;
import com.ityml.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
* -----------------------------
* PackageName: com.ityml.impl
* ClassName:ProductServiceImpl
* Description:实现类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@Service
public class ProductServiceImpl implements ProductService {
@Autowired
private ProductDao productDao;
@Override
public Product findById(Integer pid) {
return productDao.findById(pid).get();
}
}
创建Controller
package com.ityml.controller;
import com.ityml.entity.Product;
import com.ityml.service.ProductService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* -----------------------------
* PackageName: com.ityml.controller
* ClassName:ProductController
* Description:主类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@RestController
@Slf4j
public class ProductController {@Autowired
private ProductService productService;
@GetMapping("/product/{pid}")
public Product product(@PathVariable("pid") Integer pid){
Product product = productService.findById(pid);
return product;
}
}
启动工程
创建一个名为shop-order的模块,并添加springboot依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion><parent>
<groupId>com.ityml</groupId>
<artifactId>springcloud-alibaba</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.ityml</groupId>
<artifactId>shop-order</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.ityml</groupId>
<artifactId>shop-common</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
创建工程主类
package com.ityml;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* -----------------------------
* PackageName: com.ityml
* ClassName:OrderApplication
* Description:主类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@SpringBootApplication
public class OrderApplication {
public static void main(String[] args) {
SpringApplication.run(OrderApplication.class,args);
}
}
创建配置文件
server:
port: 8080
spring:
application:
name: service-order
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc://
username:
data-password:
jpa:
properties:
hibernate:
hbm2ddl:
auto: update
dialect: org.hibernate.dialect.MySQL.5InnoDDialect
创建OrderDao接口
package com.ityml.dao;
import com.ityml.entity.Order;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* -----------------------------
* PackageName: com.ityml.dao
* ClassName:ProductDao
* Description:
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
public interface OrderDao extends JpaRepository<Order,Integer> {
}
创建OrderService接口和实现类
package com.ityml.service;
import com.ityml.entity.Order;
/**
* -----------------------------
* PackageName: com.ityml.service
* ClassName:ProductService
* Description:
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
public interface OrderService {
void save(Order order);
}
创建RestTemplate
package com.ityml;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
/**
* -----------------------------
* PackageName: com.ityml
* ClassName:OrderApplication
* Description:主类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@SpringBootApplication
public class OrderApplication {
public static void main(String[] args) {
SpringApplication.run(OrderApplication.class,args);
}
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
创建Controller
package com.ityml.controller;
import com.ityml.entity.Order;
import com.ityml.entity.Product;
import com.ityml.service.OrderService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
/**
* -----------------------------
* PackageName: com.ityml.controller
* ClassName:OrderController
* Description:主类
*
* @author:it-yml CreateTime:2022-03-23
* -----------------------------
*/
@RestController
@Slf4j
public class OrderController {@Autowired
private OrderService orderService;
@Autowired
private RestTemplate restTemplate;
/**
* 准备买一件商品
* @param pid
*/
@GetMapping("/order/prod/{pid}")
public void Order(@PathVariable("pid") Integer pid) {
Product product = restTemplate.getForObject("http:/localhost:8081/product" + pid, Product.class);
Order order = new Order();
orderService.save(order);
}
}
启动工程,通过浏览器访问服务进行测试
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