SpringCloud服务间调用的两种方式

项目地址: 链接：https://pan.baidu.com/s/1Mxo0ltvZbpz_r8mCU-mSpw 
提取码：3j4a 

1.Feight声明式客户端工具调用调用   

    1.新建order项目 pom.xml ,order调用member服务 , member服务为正常服务,这里不粘贴了

<?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 https://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>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.zhang</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>Hoxton.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.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>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </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.   新建接口 FeignAPI调用接口 , 编写调用member服务的接口, 此处请求地址和方法,皆和member服务Controller接口请求                 地址请求方法一致

@FeignClient(name = "member") //@FeignClient 调用服务接口 name 就是被调用的服务名称
public interface FeightAPI {

    //Feign 书写方式以springMVC接口形式书写
    @GetMapping("/getMember")
    public String getMember();
}

   3. 新建Controller类,注入FeignAPI ,调用接口

@RestController
public class FeignController {

    @Autowired
    private FeightAPI feightAPI;
    
    //Feign调用
    @GetMapping("/feignToMember")
    public String feignToMember(){
      return  feightAPI.getMember();
    }
}

  4.启动类开启Feign客户端注解

@SpringBootApplication
@EnableEurekaClient  //开启Eureka客户端
@EnableFeignClients  //开启Feign客户单调用
public class OrderApplication {

    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }

}

5.访问接口,调用成功

2.RestTemplate调用  

    注意:需要@bean初始化RestTemplate对象 ,默认为负载均衡,故初始化需要加@LoadBalanced
    初始化RestTemplate对象示例:
        @Bean @LoadBalanced
        RestTemplate restTemplate(){
            return new RestTemplate();
        }
    调用方式示例: String memberUrl="http://app-itmayi-member/getMember";  //http"//+服务名/+请求地址
                  restTemplate.getForObject(memberUrl,String.class); //请求地址 , 返回类型

1.初始化RestTemplat对象

@Bean
@LoadBalanced  //客户端负载均衡
RestTemplate restTemplate(){
    return new RestTemplate();
}

2.注入RestTemplate ,调用member服务

@Autowired
private RestTemplate restTemplate;

//RestTemplate 调用
@GetMapping("/restToMember")
public String restToMember(){
   String memberUrl="http://member/getMember";  //http"//+服务名/+请求地址
   return restTemplate.getForObject(memberUrl,String.class); //请求地址 , 返回类型
}

@Bean
@LoadBalanced//客户端负载均衡
RestTemplate restTemplate(){
   return new RestTemplate();
}

  3.访问接口,调用成功