Feign服务消费者

Feign的优点:面向接口,完全不用管实现,传入规定格式的数据就可以了

搭建消费者项目(FeignDemo)

1、创建pom.xml

<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>
<groupId>com.cppdy</groupId>
<artifactId>FeignDemo</artifactId>
<version>0.0.1-SNAPSHOT</version> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath />
</parent> <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency> <dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-feign</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</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>Dalston.RC1</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>

2、创建application.yml配置文件

eureka:
client:
service-url:
defaultZone: http://127.0.0.1:9000/eureka/
server:
port: 9004
spring:
application:
name: cppdy-feign

3、创建HelloService接口

package com.cppdy.service;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam; @FeignClient(value = "cppdy-hello")
public interface HelloService { @RequestMapping("hello")
String hello(@RequestParam("name") String name);
}

4、创建HelloController类

package com.cppdy.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController; import com.cppdy.service.HelloService; @RestController
public class HelloController { @Autowired
private HelloService helloService; @RequestMapping("hello")
public String hello(String name) { return helloService.hello(name);
} }

5、创建启动类(FeignApp)

package com.cppdy;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients; @SpringBootApplication
//开启服务发现
@EnableDiscoveryClient
//开启feign
@EnableFeignClients
public class FeignApp { public static void main(String[] args) {
SpringApplication.run(FeignApp.class, args);
} }

6、先启动EurekaDemo(注册中心项目),再启动2个ProduceDemo(服务提供者项目)端口号分别设置为9001、9002,再启动FeignDemo(消费者项目)端口号设置为9004,一直访问http://localhost:9004/hello,会自动轮流调用9001和9002的hello方法(负载均衡)

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