OpenFeign客户端调用

1.简介：

OpenFeign声明式的webService客户端. Feign可以与Eureka和Ribbon组合以支持负载均衡。使用方法是定义一个接口并在上面添加注解。

 

2.代码

 

 

 这里的EurekaMain7001和EurekaMain7002是两个Eureka server.  PaymentMain8001和PaymentMain8002注册到Eureka。 通过FeignOrderMain80对PaymentMain8001和PaymentMain8002进行调用。

 

创建FeignOrderMain80工程：

pom：

    <dependencies>
        <!-- open feign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>com.shishi.springcloud</groupId>
            <artifactId>cloud-api-common</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.shishi.springcloud</groupId>
            <artifactId>cloud-provider-payment8001</artifactId>
            <version>1.0-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

 

yml:

server:
  port: 80

spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: org.gjt.mm.mysql.Driver
    url: jdbc:mysql://localhost:3306/db2021?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root

eureka:
  client:
    register-with-eureka: false
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

#这个yml是不需要写datasource的，但是老是报错数据库连接源没配置， 查了一下是说引入了Mybatis的包，但是加了@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class}) 也没用，不引入数据库连接的依赖也没用。所以暂时就这样了。

 

service层：

@Component
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {
    @GetMapping(value="/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id);
}

 

controller层：

@RestController
public class PaymentFeignController {
    @Resource
    private PaymentFeignService paymentFeignService;
    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id) {
        return paymentFeignService.getPaymentById(id);
    }
}

 

主程序：

@SpringBootApplication
@EnableFeignClients
public class FeignOrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(FeignOrderMain80.class, args);
    }
}

 

3.测试：