Spring Boot项目基于Spring Cloud Feign调用第三方外部接口

一、添加maven依赖

（1）添加SpringCloud依赖

<properties>
    <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>

（2）添加dependencyManagement相关依赖控制Spring Cloud的版本

<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>

（3）添加openfeign的依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

二、配置config类

import feign.Feign;
import okhttp3.ConnectionPool;
import org.springframework.boot.autoconfigure.AutoConfigureBefore;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.context.annotation.Bean;
import org.springframework.cloud.openfeign.FeignAutoConfiguration;
import org.springframework.context.annotation.Configuration;

import java.util.concurrent.TimeUnit;

@Configuration
@ConditionalOnClass(Feign.class)
@AutoConfigureBefore(FeignAutoConfiguration.class)
public class FeignConfig {

    @Bean
    public okhttp3.OkHttpClient okHttpClient(){
        return new okhttp3.OkHttpClient.Builder()
                .readTimeout(60, TimeUnit.SECONDS)
                .connectTimeout(60, TimeUnit.SECONDS)
                .writeTimeout(120, TimeUnit.SECONDS)
                .connectionPool(new ConnectionPool())
                .build();
    }
}

三、主类添加注解

@EnableFeignClients

四、编写feign调用接口

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

@FeignClient(name = "testfeignSerive", url = "http://ip:port/")
public interface FeignService {

    @RequestMapping(value = "testmethod",method = RequestMethod.POST)
    String getMaillist(@RequestParam(value = "t") String t);

}

五、调用时,直接在controller中,注入该接口即可

@Autowired
    private FeignService feignClientProxy;
String obj = feignClientProxy.getMaillist(t);

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