本部分需要依赖之前的配置中心和服务注册中心、服务提供者三个示例代码运行
三种方式
- RestTemplate
- Ribbon
- Feign
下面描述的是通过RestTemplate的方式进行服务调用
- RestTemplate
RestTemplate是Spring提供的用于访问Rest服务的客户端，RestTemplate提供了多种便捷访问远程Http服务的方法，能够大大提高客户端的编写效率
1.引入依赖
compile "org.springframework.cloud:spring-cloud-starter-eureka:${cloud_config}"
2.稍作配置
在bootstrap.yaml中加入Eureka server相关配置
spring:
cloud:
config:
uri: http://localhost:8888
profile: rabbit
name: appliaction
username: pkaq
password: pkaqx
3.添加注解
@EnableEurekaClient
4.来点代码
@SpringBootApplication
@EnableEurekaClient
open class RabbitClientBooter: CommandLineRunner{
//spring默认已注入RestTemplateBuilder实例
@Autowired
val builder: RestTemplateBuilder? = null
// 实例化restTemplate
@Bean
open fun restTemplate(): RestTemplate {
return builder!!.build()
}
@Throws(Exception::class)
override fun run(vararg args: String) {
println(" --- --- --- [ Rabbit client started ] --- --- --- ")
}
}
fun main(args: Array<String>) {
org.springframework.boot.SpringApplication.run(org.pkaq.RabbitClientBooter::class.java, *args)
}
Controller代码
@RestController
class RabbitController {
@Autowired
var loadBalancerClient: LoadBalancerClient? = null;
@Autowired
var restTemplate: RestTemplate? = null
@RequestMapping("/jump")
fun say(): String {
// 这里配置要调用发的服务提供者的spring.
var microServiceNode = "tiger"
var serviceName = "say"
var serviceInstance = loadBalancerClient!!.choose(microServiceNode)
var url = "http://"+serviceInstance.host+":"+serviceInstance.port+"/"+serviceName
return restTemplate!!.getForObject(url, String::class.java)+" - > Rabbit"
}
}
5.启动服务,大功告成
