从浅入深 学习 SpringCloud 微服务架构（二）模拟微服务环境（1）

段子手168

1、打开 idea 创建父工程

创建 artifactId 名为 spring_cloud_demo 的 maven 工程。

--> idea --> File 
--> New --> Project 
--> Maven Project SDK: ( 1.8(java version "1.8.0_131" ) 
--> Next 
--> Groupld : ( djh.it )Artifactld : ( spring_cloud_demo )Version : 1.0-SNAPSHOT
--> Name: ( spring_cloud_demo )Location: ( D:\java_test\Intesij_idea\spring_cloud_demo )	
--> Finish

2、在父工程 spring_cloud_demo 的 pom.xml 文件中导入依赖坐标。

<?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><groupId>djh.it</groupId><artifactId>spring_cloud_demo</artifactId><version>1.0-SNAPSHOT</version><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.6.RELEASE</version></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.4</version><scope>provided</scope></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Greenwich.RELEASE</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><repositories><repository><id>spring-snapshots</id><name>Spring Snapshots</name><url>http://repo.spring.io/libs-snapshot-local</url><snapshots><enabled>true</enabled></snapshots></repository><repository><id>spring-milestones</id><name>Spring Milestones</name><url>http://repo.spring.io/libs-milestone-local</url><snapshots><enabled>false</enabled></snapshots></repository><repository><id>spring-releases</id><name>Spring Releases</name><url>http://repo.spring.io/libs-release-local</url><snapshots><enabled>false</enabled></snapshots></repository></repositories><pluginRepositories><pluginRepository><id>spring-snapshots</id><name>Spring Snapshots</name><url>http://repo.spring.io/libs-snapshot-local</url><snapshots><enabled>true</enabled></snapshots></pluginRepository><pluginRepository><id>spring-milestones</id><name>Spring Milestones</name><url>http://repo.spring.io/libs-milestone-local</url><snapshots><enabled>false</enabled></snapshots></pluginRepository></pluginRepositories><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project><!-- D:\java_test\Intesij_idea\spring_cloud_demo\pom.xml -->

3、在父工程 spring_cloud_demo 下，创建子工程（子模块）

1）创建 子工程（子模块）

--> 右键 spring_cloud_demo 父工程
--> Modules 
--> Maven 
--> Groupld : ( djh.it )Artifactld : ( product_service )Version : 1.0-SNAPSHOT
--> Next 
--> Module name: ( product_service )Content root : ( D:\java_test\Intesij_idea\spring_cloud_demo\product_service )Module file location: ( D:\java_test\Intesij_idea\spring_cloud_demo\product_service )
--> Finish

4、在子工程 product_service 的 pom.xml 中导入依赖

<?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"><parent><artifactId>spring_cloud_demo</artifactId><groupId>djh.it</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>product_service</artifactId><dependencies><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.32</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency></dependencies></project><!-- D:\java_test\Intesij_idea\spring_cloud_demo\pom.xml -->

5、准备数据库表

— 创建数据库：
create database shop;

— 使用数据库：
use shop;

— 创建数据表：

	CREATE TABLE `tb_product` (`id` int NOT NULL AUTO_INCREMENT,`product_name` varchar(40) DEFAULT NULL COMMENT '名称',`status` int DEFAULT NULL COMMENT '状态',`price` decimal(10,2) DEFAULT NULL COMMENT '单价',`product_desc` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '描述',`caption` varchar(255) DEFAULT NULL COMMENT '标题',`inventory` int DEFAULT NULL COMMENT '库存',PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb3

— 插入数据：

6、创建 商品实体类 Product.java

/***  D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\domain\Product.java**  2024-4-17 商品实体类 Product.java*/
package djh.it.product.domain;import lombok.Data;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import java.math.BigDecimal;@Data
@Entity
@Table(name="tb_product")  //对应数据库中的数据表
public class Product {@Idprivate Long id;private String productName;private Integer status;private BigDecimal price;private String productDesc;private String caption;private Integer inventory;
}

7、创建 dao 持久层接口 ProductDao.java

/***  D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\dao\ProductDao.java**  2024-4-17  dao 持久层接口 ProductDao.java*/
package djh.it.product.dao;import djh.it.product.domain.Product;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;public interface ProductDaoextends JpaRepository<Product, Long>, JpaSpecificationExecutor<Product> {}

8、创建 service 服务层 接口 ProductService.java

/***  D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\service\ProductService.java**  2024-4-17  service 服务层 接口 ProductService.java*/
package djh.it.product.service;import djh.it.product.domain.Product;public interface ProductService {//根据id查询Product findById(Long id);//保存void save(Product product);//更新void update(Product product);//删除void delete(Long id);
}

9、创建 service 服务层 实现类 ProductServiceImpl.java

/***  D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\service\Impl\ProductServiceImpl.java**  2024-4-17  service 服务层 实现类*/
package djh.it.product.service.Impl;import djh.it.product.domain.Product;
import djh.it.product.dao.ProductDao;
import djh.it.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class ProductServiceImpl implements ProductService {@Autowiredprivate ProductDao productDao;@Overridepublic Product findById(Long id) {return productDao.findById(id).get();}@Overridepublic void save(Product product) {productDao.save(product);}@Overridepublic void update(Product product) {productDao.save(product);}@Overridepublic void delete(Long id) {productDao.deleteById(id);}
}

10、创建 商品的 controller 类 ProductController.java

/***  D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\controller\ProductController.java**  2024-4-17 商品的 controller 类 ProductController.java*/
package djh.it.product.controller;import djh.it.product.domain.Product;
import djh.it.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;@RestController
@RequestMapping("/product")
public class ProductController {@Autowiredprivate ProductService productService;@RequestMapping(value = "/{id}", method = RequestMethod.GET)public Product findById(@PathVariable Long id){Product product = productService.findById(id);return product;}@RequestMapping(value = "", method = RequestMethod.POST)public String save (@RequestBody Product product){productService.save(product);return "保存成功";}}

11、创建配置文件 application.yml

## D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\resources\application.ymlserver:port: 9001  # 启动端口 命令行注入。
#  port: ${port:56010}  # 启动端口设置为动态传参，如果未传参数，默认端口为 56010
#  servlet:
#    context-path: /application1spring:application:name: service-product  #spring应用名, # 注意 FeignClient 不支持名字带下划线
#  main:
#    allow-bean-definition-overriding: true # SpringBoot2.1 需要设定。datasource:driver-class-name: com.mysql.jdbc.Driver  # mysql 驱动
#    url: jdbc:mysql://localhost:3306/shop?useUnicode=true&characterEncoding=utf8url: jdbc:mysql://localhost:3306/shop?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghaiusername: rootpassword: 12311jpa:database: MySQLshow-sql: trueopen-in-view: true

12、创建 启动类 ProductApplication.java

/***   D:\java_test\Intesij_idea\spring_cloud_demo\product_service\src\main\java\djh\it\product\ProductApplication.java**   2024-4-17  启动类 ProductApplication.java*/
package djh.it.product;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;@SpringBootApplication
@EntityScan("djh.it.product.domain")
public class ProductApplication {public static void main(String[] args) {SpringApplication.run(ProductApplication.class, args);}
}

13、运行启动类，进行测试

浏览器地址栏输入：http://127.0.0.1:9001/product/1

输出 mysql 数据库的第一条记录：

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# 从浅入深 学习 SpringCloud 微服务架构（一）基础知识