Previous: Consul registration center 01: Spring Cloud microservice architecture practice You can click review. Next, let's talk about the introduction case of consumer.

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1. Create project

Let's create an aggregation project to explain Consul. First, create a pom parent project.

 

2. Add dependency

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>

    <!-- Project coordinate address -->
    <groupId>com.example</groupId>
    <!-- Project module name -->
    <artifactId>consul-demo</artifactId>
    <!-- Project version name snapshot version SNAPSHOT,Official version RELEASE -->
    <version>1.0-SNAPSHOT</version>

    <!-- inherit spring-boot-starter-parent rely on -->
    <!-- Use inheritance method to realize reuse, and all inheritable can be used -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
    </parent>

    <!--
        The dependent component version number is defined centrally, but is not imported,
        When a declared dependency is used in a subproject, the version number of the dependency can be omitted,
        In this way, the dependent versions used in the project can be managed uniformly
     -->
    <properties>
        <!-- Spring Cloud Hoxton.SR1 rely on -->
        <spring-cloud.version>Hoxton.SR1</spring-cloud.version>
    </properties>

    <!-- Project dependency management the parent project only declares dependency, and the child project needs to specify the required dependency(Version information can be omitted) -->
    <dependencyManagement>
        <dependencies>
            <!-- spring cloud rely on -->
            <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>

 

3. Service provider

3.1 create project

Create a service provider service provider project under the parent project.

 

3.2 add dependency

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>com.example</groupId>
    <artifactId>service-provider</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!-- Inherit parent dependency -->
    <parent>
        <groupId>com.example</groupId>
        <artifactId>consul-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <!-- Project dependency -->
    <dependencies>
        <!-- spring cloud consul rely on -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        <!-- spring boot actuator rely on -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- spring boot web rely on -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- lombok rely on -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <scope>provided</scope>
        </dependency>

        <!-- spring boot test rely on -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
  
</project>

 

3.3 configuration file

application.yml

server:
  port: 7070 # port

spring:
  application:
    name: service-provider # apply name
  # Configure Consul registry
  cloud:
    consul:
      # Access address of the registry
      host: localhost
      port: 8500
      # Service provider information
      discovery:
        register: true                                # Need to register
        instance-id: ${spring.application.name}-01    # Registration instance id (must be unique)
        service-name: ${spring.application.name}      # Service name
        port: ${server.port}                          # Service port
        prefer-ip-address: true                       # Use ip address to register
        ip-address: ${spring.cloud.client.ip-address} # Service request ip

 

3.4 entity class

Product.java

package com.example.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Product implements Serializable {

    private Integer id;
    private String productName;
    private Integer productNum;
    private Double productPrice;

}

 

3.5 writing services

ProductService.java

package com.example.service;

import com.example.pojo.Product;

import java.util.List;

/**
 * Goods and services
 */
public interface ProductService {

    /**
     * Query product list
     *
     * @return
     */
    List<Product> selectProductList();

}

ProductServiceImpl.java

package com.example.service.impl;

import com.example.pojo.Product;
import com.example.service.ProductService;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.List;

/**
 * Goods and services
 */
@Service
public class ProductServiceImpl implements ProductService {

    /**
     * Query product list
     *
     * @return
     */
    @Override
    public List<Product> selectProductList() {
        return Arrays.asList(
                new Product(1, "Huawei Mobile", 1, 5800D),
                new Product(2, "Lenovo notebook", 1, 6888D),
                new Product(3, "Mi Pad ", 5, 2020D)
        );
    }

}

 

3.6 control layer

ProductController.java

package com.example.controller;

import com.example.pojo.Product;
import com.example.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

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

    @Autowired
    private ProductService productService;

    /**
     * Query product list
     *
     * @return
     */
    @GetMapping("/list")
    public List<Product> selectProductList() {
        return productService.selectProductList();
    }

}

 

This project can be tested by unit test, or directly by url using postman or browser.