4.Springcloud的Eureka的服务发现

项目地址：

github地址

服务发现：其实就是提供外部接口以访问服务的内容

步骤如下：

1.在eureka的provider客户端的controller里面加入一个client，同时加入一个接口，代码如下：

package com.debuggg.cloud.controller;

import com.debuggg.cloud.entities.Dept;
import com.debuggg.cloud.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class DeptController {
    @Autowired
    private DeptService deptService;

**    @Autowired
    private DiscoveryClient discoveryClient;**

    @RequestMapping(value = "/dept/list",method = RequestMethod.GET)
    public List<Dept> list(){
        return deptService.list();
    }

    @RequestMapping(value = "/dept/get/{id}",method = RequestMethod.GET)
    public Dept get(@PathVariable("id") Long id){
        return deptService.get(id);
    }

    @RequestMapping(value = "/dept/add",method = RequestMethod.POST)
    public Boolean add(@RequestBody Dept dept){
        return deptService.add(dept);
    }

**    @RequestMapping(value = "/dept/discovery", method = RequestMethod.GET)
    public Object discovery()
    {
        List<String> list = discoveryClient.getServices();
        System.out.println("" + list);

        List<ServiceInstance> srvList = discoveryClient.getInstances("MICROSERVICECLOUD-DEPT");
        for (ServiceInstance element : srvList) {
            System.out.println(element.getServiceId() + "\t" + element.getHost() + "\t" + element.getPort() + "\t"
                    + element.getUri());
        }
        return this.discoveryClient;
    }**
}

2.在eureka的provider客户端的启动类加入注解@EnableDiscoveryClient

如下：

package com.debuggg.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class DeptProvider8001_App {
    public static void main(String[] args) {
        SpringApplication.run(DeptProvider8001_App.class,args);
    }
}

3.在eureka的consumer消费者客户端的controller加入访问接口

如下所示

    //测试@EnableDiscoveryClient,消费端可以调用服务发现
    @RequestMapping(value="/consumer/dept/discovery")
    public Object discovery()
    {
        return restTemplate.getForObject(PREFIX+"/dept/discovery", Object.class);
    }

启动eureka-server端，eureka-provider端，eureka-consumer端，可以测试eureka的服务发现，