使用Feign访问接口

 添加主要依赖

使用Feign访问接口的配置，如果服务不在Eureka上，可以不加Eureka的依赖，用在FeignClient上指定url的方式访问

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.cloud:spring-cloud-starter-feign')
    compile('org.springframework.cloud:spring-cloud-starter-eureka')
    compileOnly group: 'org.projectlombok', name: 'lombok', version: '1.16.12'
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

gradle配置文件

buildscript {
    ext {
        springBootVersion = '1.5.8.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'org.springframework.boot'

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
}

dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    compile('org.springframework.cloud:spring-cloud-starter-feign')
    compile('org.springframework.cloud:spring-cloud-starter-eureka')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

ext {
    springCloudVersion = 'Dalston.SR4'
}
dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}

配置文件中Eureka地址

（下面是yml文件的配置格式）

eureka:
  client:
    enabled: true #访问eureka服务时要打开
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

Application主类添加注解

@EnableDiscoveryClient
@EnableFeignClients

@SpringBootApplication

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

编写FeignClient接口

dp-dealer-shop是指定的应用名，不用Eureka的话不可以这样做，可以用指定一个Name和Url的方式调用接口
接口中不支持@GetMapping这样的简写，要用@RequestMapping的写法

@FeignClient("dp-dealer-shop")

public interface Feign {
    @RequestMapping(method = RequestMethod.GET, value = "/api/quotation/v0/sendLargeRegionMail")
    List<AuditEmailContentDto> getLargeRegionMailContent();
}