SpringCloud第五篇 feign

1.新建一个项目feign-client

选择eureka discovery,feign,web三个依赖

2.启动eureka,两个eureka client

3.具体的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>com.star.guo</groupId>
       <artifactId>springcloudversion</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <relativePath /> 
   </parent>
   <groupId>com.star.guo</groupId>
   <artifactId>feign-client</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   <packaging>jar</packaging>
   <name>feign-client</name>
   <description>Demo project for Spring Boot</description>

   <properties>
       <java.version>1.8</java.version>
       <spring-cloud.version>Greenwich.M3</spring-cloud.version>
   </properties>

   <dependencies>
       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-web</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-openfeign</artifactId>
       </dependency>

       <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-test</artifactId>
           <scope>test</scope>
       </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>

   <build>
       <plugins>
           <plugin>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-maven-plugin</artifactId>
           </plugin>
       </plugins>
   </build>

   <repositories>
       <repository>
           <id>spring-milestones</id>
           <name>Spring Milestones</name>
           <url>https://repo.spring.io/milestone</url>
           <snapshots>
               <enabled>false</enabled>
           </snapshots>
       </repository>
   </repositories>

</project>
4.核心配置文件application.yml

eureka:
client:
serviceUrl:
defaultZone: http://localhost:8000/eureka/
server:
port: 8004
spring:
application:
name: feign-client

5.添加注解

@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients

效果图如下

6.添加一个Service接口

package com.star.guo.service;

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

@FeignClient(value = "EUREKA-CLIENT")
public interface FeignService {

   /**
   * hello方法
   *
   * 本例子未使用其他的路径，如果使用的有配置就行如@GetMapping(value = "/hello")
   *
   * @param user 用户名称
   * @return String
   */
   @GetMapping
   String hello(@RequestParam(value = "user") String user);
}
7.添加一个Controller，用于web测试feign调用情况

package com.star.guo.controller;

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

import com.star.guo.service.FeignService;

/**
* 消息Controller,使用feign测试集群效果
*
* @author Star.Guo
*
*/
@RestController
public class MessageController {

@Autowired
FeignService feignService;

   /**
   * Hello方法
   *
   * @param user 用户名
   * @return String
   */
   @GetMapping
   public String hello(String user) {
       return feignService.hello(user);
   }

}
8.浏览器访问

http://localhost:8004/?user=yourname

刷新会交替显示下面内容则正常

hello yourname current port is:8001

hello yourname current port is:8002

SpringCloud第五篇 feign

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