2019-06-12 两种rpc调用方式

1、pom文件

<?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>2.1.5.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.zbiti.zz</groupId>

    <artifactId>order</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>order</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-feign</artifactId>

            <version>1.4.0.RELEASE</version>

        </dependency>

        <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>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

2、application.yml

server:

  port: 1007

spring:

  application:

    name: order

eureka:

  client:

    service-url:

      defaultZone: http://localhost:1005/eureka/

    register-with-eureka: true

    fetch-registry: true

3 

3.1 RestTemplate 方式需要准备一个 配置bean

@Configuration

public class RestTemplateMothedBeans {

@Bean

@LoadBalanced//这是ribbon 负载均衡

    public RestTemplate restTemplate(){

        return new RestTemplate();

    }

}

3.2 需要定义一个feign客户端接口

//value 是被调用服务名称，注册在eureka里的名称

@FeignClient(value ="member")

public interface MemberApiFeign {

//服务中方法的映射路径。照搬member 服务中的映射和方法，只是么有方法体

    @RequestMapping("/getMember")

    public String getMember();

}

3.3远程调用member 服务中的方法

@RestController

public class OrderApiController {

#RestTemplate方式需要注入上面方法中的bean

    @Autowired

    private RestTemplate restTemplate;

#feign 客户端方式，直接注入上面定义的接口

    @Autowired

    private MemberApiFeign memberApiFeign;

    @RequestMapping("/remote/member")

public String orderRemoteGetMember(){

        String url="http://member/getMember";//当使用ribbon 负载均衡调用微服务时，这里就可以直接 将ip和端口替换为注册的服务名

        String s = restTemplate.getForObject(url, String.class);

        System.out.println(s);

        return s;

    }

    @RequestMapping("/feign/remote")

    public String feignRemoteGetMember(){

        return memberApiFeign.getMember();

    }

}