demo(二)eureka&ribbon—-服务注册、提供与消费 - 服务器托管|北京服务器租用|机房托管租用|IDC托管租用|机房机柜带宽租用-价格及费用咨询

前一篇实现了服务注册中心的搭建，并提供服务注册到注册中心上。在之前的基础上，实现服务消费。

一、相关介绍

1、RestTemplate工具

2、@LoadBalanced注解：开启客户端负载均衡

二、ribbon示例：

先启动eureka-service注册中心，再将eureka-client修改端口号为2222、2223分别启动两次，可以看到服务提供者注册了两个端口2222、2223，

下面实现ribbon的负载均衡消费：

1、pom：



    4.0.0

    com.demo.cloud
    myspringcloud-eureka-ribbon
    1.0-SNAPSHOT
    
    
        org.springframework.boot
        spring-boot-starter-parent
        1.5.9.RELEASE
    

    
        UTF-8
        UTF-8
        1.8
        Edgware.RELEASE
    

    
        
        
            org.springframework.cloud
            spring-cloud-starter-eureka
        

        
            org.springframework.cloud
            spring-cloud-starter-ribbon
        

        
服务器托管网            com.demo.cloud.api
            myspringcloud-api
            1.0-SNAPSHOT
            system
            D:/my-demo-code/codecloud/myspringcloud-api/target/my-api.jar
        

        
            org.springframework.boot
            spring-boot-starter-web
        

        
            commons-collections
            commons-collections
            3.2.1
        

        
            commons-lang
            commons-lang
            2.5
        

    

    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

    
        
            spring-milestones
            Spring Milestones
            https://repo.spring.io/libs-milestone
            
                false

2、application配置文件：

server.port=3333
server.context-path=/myTest
spring.application.name=my-test
eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/

3、启动类：

package com.demo.cloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableDiscoveryClient
public class MyConsumerApplication {

    @Bean
    @LoadBalanced
    RestTemplate restTemplate(){
        return new RestTemplate();
    }
    public static void main(String args[]){
        SpringApplication.run(MyConsumerApplication.class,args);
    }
}

4、controller:

package com.demo.cloud.controller;

import com.demo.cloud.dto.AuthorityDTO;
import com.demo.cloud.dto.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.nio.ch服务器托管网arset.StandardCharsets;
import java.util.HashMap;
import java.util.List;

@RequestMapping("/user")
@RestController
public class UserApiController {

    @Autowired
    private RestTemplate restTemplate;

    //注意这里服务提供者的名称与注册中心上保持一致大写了，与代码中名称一致小写也可以
    private static final String REST_URL_PREFIX="http://MY-SERVICE/myService";

    @RequestMapping("/findByUserName")
    public UserDTO findByUserName(String username){
        HashMap paramMap = new HashMap();
        paramMap.put("username",username);
        UserDTO userDTO = restTemplate.getForObject(REST_URL_PREFIX+"/user/findByUserName?username={username}",UserDTO.class,paramMap);
        return userDTO;
    }

    @RequestMapping("/getAllUsers")
    public List getAllUsers(){
        List userDTOS = restTemplate.getForObject(REST_URL_PREFIX+"/user/getAllUsers",
                List.class);
        return userDTOS;
    }

    @RequestMapping("/addUser")
    public void addUser1(@RequestBody UserDTO userDTO){
        restTemplate.postForEntity(REST_URL_PREFIX+"/user/addUser",userDTO,Boolean.class);
    }
}

启动后刷新注册中心，看到消费者也注册上去了