SpringCloud之Ribbon

SpringCloud通过Ribbon实现负载均衡。

一、添加Maven依赖

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

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

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

二、application.yml配置

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eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
server:
port: 8765
spring:
application:
name: blog-ribbon-client

三、主类编写

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package com.springcloud.blog;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
@EnableHystrix
@EnableCircuitBreaker
public class BlogRibbonClientApplication {

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

@Bean
@LoadBalanced
RestTemplate restTemplate() {
return new RestTemplate();
}
}

四、编写测试相关

1.编写测试业务接口类

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package com.springcloud.blog.example;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class TestService {
@Autowired
RestTemplate restTemplate;

public String getPhone(String phone) {
return restTemplate.getForObject("http://BLOG-API/juhe/getPhoneInfo?phone=" + phone, String.class);
}


}

注意:
BLOG-API是服务实例的名字,是必须要在Eureka Server注册的,否则是无效的且请求会是404。

关于restTemplate分别实现RESTFUL相关,如POST、GET、DELETE、PUT等。

通过调用restTemplate.postForEntity(url,respResult)、restTemplate.getForEntity(url,respResult)、restTemplate.delete(url,respResult)、restTemplate.put(url,respResult)等,就能立马实现。
也可以使用全能的restTemplate.getForObject(url,respResult)。

其中的url一定要是eureka服务注册中心中存在的实例,同时实例后面相关的请求接口URL一定是要存在的,否则没有意义。

2.编写测试路由类

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package com.springcloud.blog.example;

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

@RestController
@RequestMapping(value = "/test")
public class TestController {

@Autowired
TestService testService;

@GetMapping(value = "/getPhone")
public String getPhone(String phone) {

return testService.getPhone(phone);
}
}

五、测试

请求的是我个人博客系统第三方集成API相关接口,图中的例子是输入个人手机号可获取该手机号相关信息
效果图如下:

文章目录
  1. 1. 一、添加Maven依赖
  2. 2. 二、application.yml配置
  3. 3. 三、主类编写
  4. 4. 四、编写测试相关
  5. 5. 五、测试