Ribbon 服务消费

服务提供者

<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>www.tszr</groupId>
    <artifactId>mango-producer2</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
    </parent>

    <name>mango-producer</name>
    <description>mango-producer</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <swagger.version>2.9.2</swagger.version>
        <mybatis.spring.version>1.3.2</mybatis.spring.version>
        <druid.version>1.1.10</druid.version>
        <spring.boot.admin.version>2.0.4</spring.boot.admin.version>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <!-- web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.hibernate.validator</groupId>
                    <artifactId>hibernate-validator</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- swagger -->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>
        <!--spring-boot-admin -->
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
            <version>${spring.boot.admin.version}</version>
        </dependency>
        <!--consul -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        <!--test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <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>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

server:
  port: 8756
  
spring:
  application:
    name: mango-producer
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}
  boot:
    admin:
      client:
        url:
        - "http://localhost:8088"
        
# 开放健康检查接口
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS

package com.tszr.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {
    
    @RequestMapping("/hello")
    public String hello() {
        return "你好，天生自然";
    }
}

package com.tszr;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient
@SpringBootApplication
public class MangoProducerApplication {
    public static void main(String[] args) {
        SpringApplication.run(MangoProducerApplication.class, args);
    }
}

把上面的项目拷贝一份，然后端口号和接口输出内容修改一下，作为第二个服务提供者。

 

下面开始创建服务消费者

server:
  port: 8005
  
spring:
  application:
    name: mango-consumer
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}
  boot:
    admin:
      client:
        url:
        - "http://localhost:8088"
        
# 开放健康检查接口
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS

package com.tszr.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ServiceController {

    @Autowired
    private LoadBalancerClient loadBalancerClient;

    @Autowired
    private DiscoveryClient discoveryClient;

    /**
     * 获取所有服务
     */
    @RequestMapping("/services")
    public Object services() {
        return discoveryClient.getInstances("mango-producer");
    }

    /**
     * 从所有服务中选择一个服务（轮询）
     */
    @RequestMapping("/discover")
    public Object discover() {
        return loadBalancerClient.choose("mango-producer").getUri().toString();
    }
}

package com.tszr;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient
@SpringBootApplication
public class MangoConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(MangoConsumerApplication.class, args);
    }
    
    @Bean
    @LoadBalanced
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

 

 

package com.tszr.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class CallHelloController {
    @Autowired
    private LoadBalancerClient loadBalancer;

    @RequestMapping("/call")
    public String call() {
        ServiceInstance serviceInstance = loadBalancer.choose("mango-producer");
        System.out.println("服务地址：" + serviceInstance.getUri());
        System.out.println("服务名称：" + serviceInstance.getServiceId());

        String callServiceResult = new RestTemplate().getForObject(serviceInstance.getUri().toString() + "/hello",
                String.class);
        System.out.println(callServiceResult);
        return callServiceResult;
    }
}

 

package com.tszr.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class RibbonHelloController {
    @Autowired
    private RestTemplate restTemplate;
    
    @RequestMapping("/ribbon/call")
    public String call() {
        System.out.println("aaaa");
        // 调用服务, service-producer为注册的服务名称，LoadBalancerInterceptor会拦截调用并根据服务名找到对应的服务
        String callServiceResult = restTemplate.getForObject("http://mango-producer/hello", String.class);
        System.out.println(callServiceResult);
        return callServiceResult;
    }
}