springcloud之模拟微服务环境

标签：product 服务 cn springcloud springframework itcast import org 模拟

创建聚合服务

1-创建父功能new Maven Project

springcloud之模拟微服务环境_spring

修改pom.xml

<?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>cn.test</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>
        </dependency>
        <!--省略getter,setter-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.6</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>
    </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>

删掉src目录

springcloud之模拟微服务环境_spring_02

2-父工程项目右键 new module

springcloud之模拟微服务环境_maven_03

springcloud之模拟微服务环境_xml_04

服务提供者,向外界暴露一系列的服务,通过其他工程去调用这个工程.提供一个服务,对外暴露增删改查功能

springcloud之模拟微服务环境_spring_05

修改子工程的pom.xml

<?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>cn.test</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>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
    </dependencies>
</project>

3-新建数据库表

springcloud之模拟微服务环境_maven_06

springcloud之模拟微服务环境_spring_07

子模块product_service中创建商品实体类,写在src->java->cn.itcast.product.entity包中

package cn.itcast.product.entity;

import lombok.Data;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import java.math.BigDecimal;

/**
 * 商品实体类
 */
@Data  //lombok省略toString,getter,setter方法
@Entity   //指名这是一个实体Bean
@Table(name = "tb_product")   //@Table注释指定了Entity所要映射带数据库表，其中@Table.name()用来指定映射表的表名。
// 如果缺省@Table注释，系统默认采用类名作为映射表的表名。
public class Product {
    @Id   //标明主键
    private Long id;
    
    private String productName;
    private Integer status;
    private BigDecimal price;
    private String productDesc;
    private String caption;
    private Integer inventory;
}

4-子模块product_service,新建dao包,新建ProductDao接口

springcloud之模拟微服务环境_xml_08

增删改查,分页排序方法已经自动有了

package cn.itcast.product.dao;

import cn.itcast.product.entity.Product;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * 使用data jpa,接口需要继承两个
 * SpringDataJpa的优点：它的Dao层只需要写接口，不需要写实现类，只需要写一个接口继承JpaRepository接口即可，
 * 该接口有两个泛型<T,ID>,在Dao层接口里可以什么都不用写。 T：domain实体类类型, ID：domain实体类的主键字段类型
 */
public interface ProductDao extends JpaRepository<Product,Long>, JpaSpecificationExecutor<Product> {
}

5-子模块product_service,新建service包,ProductService接口

package cn.itcast.product.service;

import cn.itcast.product.entity.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);
}

6-子模块product_service,在service包中新建impl包,ProductServiceImpl类

package cn.itcast.product.service.impl;

import cn.itcast.product.dao.ProductDao;
import cn.itcast.product.entity.Product;
import cn.itcast.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    private ProductDao productDao;

    @Override
    public Product findById(Long id) {
        return productDao.findById(id).get();
    }

    @Override
    public void save(Product product) {
        productDao.save(product);
    }

    @Override
    public void update(Product product) {
        productDao.save(product);
    }

    @Override
    public void delete(Long id) {
        productDao.deleteById(id);
    }
}

7-子模块product_service,新建controller包,ProductController类

package cn.itcast.product.controller;

import cn.itcast.product.entity.Product;
import cn.itcast.product.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/product")
public class ProductController {

    @Autowired
    private 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)
//@RequestBody主要用来接收前端传递给后端的json字符串中的数据的(请求体中的数据的)；
//GET方式无请求体，所以使用@RequestBody接收数据时，前端不能使用GET方式提交数据，而是用POST方式进行提交。
    public String save(@RequestBody Product product){
        productService.save(product);
        return "保存成功";
    }
}

8-子模块product_service,添加启动类ProductApplication

package cn.itcast.product;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;

@SpringBootApplication
@EntityScan("cn.itcast.product.entity")  //用来扫描和发现指定包及其子包中的Entity定义
public class ProductApplication {
    public static void main(String[] args) {
        SpringApplication.run(ProductApplication.class,args);
    }
}

9-子模块product_service,resources包下新建application.yml

server:
  port: 9001
spring:
  application:
    name: service-product
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456
  jpa:
    database: MySQL
    show-sql: true
    open-in-view: true

10-运行子模块product_service的启动类ProductApplication

springcloud之模拟微服务环境_maven_09

11-父工程下new module新建order_service模块, maven

添加依赖,修改pom.xml

<dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
    </dependencies>

12-在子模块order_service中,resources包下新建application.yml

server:
  port: 9002
spring:
  application:
    name: service-order
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8&useSSL=false
    username: root
    password: 123456
  jpa:
    database: MySQL
    show-sql: true
    open-in-view: true

13-在子模块order_service中,java包下新建cn.itcast.order包,新建启动类OrderApplication

package cn.itcast.order;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EntityScan("cn.itcast.order.entity")  //用来扫描和发现指定包及其子包中的Entity定义
public class OrderApplication {

    /**
     * 使用spring提供的RestTemplate发送http请求到商品服务
     * 1-创建RestTemplate对象交给容器管理
     * 2-在使用的时候,调用其方法完成操作(getXX,postXXX)
     */
    
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
    
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class,args);
    }
}

14-将Service-Product中的entity包复制一份到Service-Order中

package cn.itcast.order.entity;

import lombok.Data;
import java.math.BigDecimal;

/**
 * 商品实体类
 */
@Data  //lombok省略toString,getter,setter方法
public class Product {
    private Long id;
    private String productName;
    private Integer status;
    private BigDecimal price;
    private String productDesc;
    private String caption;
    private Integer inventory;
}

15-在order-service子模块中,新建controller包,OrderController类

package cn.itcast.order.controller;

import cn.itcast.order.entity.Product;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("/order")
public class OrderController {

    //注入restTemplate
    @Autowired
    private RestTemplate restTemplate;

    /**
     *
     * @param id 商品id
     * @return
     * 通过订单系统,调用商品服务根据id查询商品信息
     *   1-需要配置商品服务
     *   2-需要调用商品服务
     */
    @RequestMapping(value = "/buy/{id}",method = RequestMethod.GET)
    public Product findById(@PathVariable Long id){
        Product product = null;
        //如何调用远程服务?
        product = restTemplate.getForObject("http://127.0.0.1:9001/product/1",Product.class);
        return product;
    }
}

16-启动OrderApplication启动类

springcloud之模拟微服务环境_maven_10

模拟微服务中存在的问题

springcloud之模拟微服务环境_xml_11

标签：product,服务,cn,springcloud,springframework,itcast,import,org,模拟
From： https://blog.51cto.com/u_12528551/5900115

springcloud之模拟微服务环境

模拟微服务中存在的问题

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