Http服务化改造实践（三）

WilliamGates

发布于 2022-6-21 16:16

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4.2 服务端实现公共API
首先需要添加相应的maven依赖，代码如下：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vhicool</groupId>
            <artifactId>feign-api</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>1.
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服务端采用继承方式实现，具体代码如下所示：

@Controller
@RequestMapping
public class UserController implements IUserController {
 @Override
 @ResponseBody
 public List<String> listAll(String name) {
  ArrayList<String> list = new ArrayList<>();
  list.add("达菲");
  list.add("olu");
  list.add(name);
  return list;
 }
}1.
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4.3 客户端实现公共API
客户端首先同样需要增加相应的依赖，具体代码如下所示：

         <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>compile</scope>
        </dependency>
         <dependency>
            <groupId>com.vhicool</groupId>
            <artifactId>feign-api</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>1.
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客户端服务调用类需要继承公共API:

@FeignClient(value = "user", url = "http://localhost:8080")
public interface UserApi extends IUserController {
}1.
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同时客户端启动类需要增加@EnableFeignClients注解，具体示例代码如下所示：

@SpringBootApplication
@EnableFeignClients
public class ManagerApplication {
 public static void main(String[] args) {
  SpringApplication.run(ManagerApplication.class, args);
 }
}1.
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同样基于Springboot编程方式，可以为Feign配置全局参数，具体如下：

@Configuration
public class FeignConfiguration {
 /**
  * 请求超时时间
  * @return
  */
 @Bean
 public Request.Options options() {
  return new Request.Options(2000, 3500);
 }
  //拦截器等定义
}1.
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接下来客户端就可以用如下方式进行调用：

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserControllerTest {
 @Autowired
 private UserApi userApi;

 @Test
 public void listAll() {
  System.out.println(userApi.listAll("饼饼"));
 }
}1.
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