五、SpringCloud服务调用(Feign接口对象模式)

喜欢ヅ旅行 2022-05-12 09:14 192阅读 0赞

**第一步**、在当前项目pom.xml中添加**spring-cloud-starter-feign**的jar包

<dependencies>
        
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-eureka</artifactId>
          <version>1.3.4.RELEASE</version>
        </dependency>
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-ribbon</artifactId>
          <version>1.3.4.RELEASE</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-feign</artifactId>
          <version>1.3.4.RELEASE</version>
        </dependency>
    
    </dependencies>
    
    <dependencyManagement>
        <dependencies>
            <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-starter-parent</artifactId>
              <version>Brixton.SR5</version>
              <type>pom</type>
            </dependency>
        </dependencies>

**第二步**：在**application.properties**中配置**eureka**参数

eureka.client.serviceUrl.defaultZone=http://localhost:7777/eureka

**第三步：**创建cn.xxx.xxx.remote包，在创建定义xxxRemote远程Feign接口，追加@FeignClient标记

@FeignClient(name="SUBJECT-SERVICE")//指定注册服务名
    public interface SubjectRemote {
    
        //方法参考Controller定义编写
        @RequestMapping(value="/subject",method=RequestMethod.GET)
        public ResponseResult loadSubjects();
    
    }

**第四步**：直接在**Controller**中注入SubjectRemote (远程**Feign**对象调用远程服务)接口

@Controller
    @RequestMapping("/exam")
    public class ExamController {
    	
    	@Autowired
    	private SubjectRemote subjectRemote;
    	
    	
    	@RequestMapping("/home.html")
    	public String home(String token,ModelMap model){
    
    
    		//调用http://localhost:8885/subject请求获取所有学科信息
    		//url规则： http://注册服务名/请求名
    		ResponseResult result = subjectRemote.loadSubjects();
    
    		……
    
    		//将数据存入Model
    		model.put("result", result);
    		return "home";//templates/home.html
    	}
    	
    }

**第五步**、添加**@EnableFeignClients**和**@EnableDiscoveryClient**标记到启动类

@EnableFeignClients//启用Feign接口模式调用服务
    @EnableDiscoveryClient//启用服务注册和查找
    @SpringBootApplication
    public class ExamWebBootApplication {
    
        public static void main(String[] args){
            SpringApplication.run(ExamWebBootApplication.class, args);
        }
    
    }

**第六步**、启动各服务测试