Between spring boot service call feign

Reference article: the Spring Cloud Feign design principles

 

1.feign component is between spring cloud service call each other, declarative, template-based HTTP client. Similar HttpURLConnection, Apache HttpComponnets, OkHttp3, Netty will achieve the same functionality.

Directory Structure

 

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>feigtest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>feigtest</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
        <fastjson.version>1.2.32</fastjson.version>

    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--feign -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <!--引入这个包才能使用fegin-->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>

        <!--<dependency>-->
            <!--<groupId>com.iot.crm.common</groupId>-->
            <!--<artifactId>crm-common</artifactId>-->
            <!--<version>1.0-SNAPSHOT</version>-->
        <!--</dependency>-->
        <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>${fastjson.version}</version>
        </dependency>
    </dependencies>

    <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>



</project>

application.yml

the Spring: 
  the Application: 
    name: Service-feigntest 
Server: 
  Port: 8702 
Eureka: 
  Client: 
    serviceUrl: 
      # to registration centers 
      defaultzone: http://192.168.111.133:8888/eureka/ 
  instance: 
    # intervals of 1s, sent once to the server heartbeat, prove that they are still "alive" 
    Lease-Renewal-in-seconds the interval the-: 1 
    # tell the server if I did not give you the heartbeat within 2s, on behalf of my "dead", I will kick off. 
    lease-expiration-duration-in- seconds: 2

IHiService.java

package com.feigtest;


import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;

@FeignClient("service-hi")
public interface IHiService {
    @PostMapping("/hi")
    public String say();
}

FeigTestController.java

package com.feigtest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Title:
 * @Auther: pujiahong
 * @Date: 2019/6/11 20:48
 * @Version: 1.0
 * @Description:
 */
@RestController
public class FeigTestController {
    @Autowired
    IHiService hiService;

    @RequestMapping("/hifeign")
    public String getFeignService(){
        return hiService.say();
    }
}

FeigtestApplication

package com.feigtest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableEurekaClient
@SpringBootApplication
@EnableFeignClients
public class FeigtestApplication {

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

}