023-Spring Boot 服务的注册和发现

一、概述

服务调用

1.1、nginx方式

1.2、注册中心

二、注册中心【zookeeper】

2.1、安装zookeeper3.4.11

2.2、服务提供方，需要在服务启动时吗、，把服务的信息（IP，port）注册到注册中心。

在上一节的mall-product中pom

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-x-discovery-server</artifactId>
            <version>2.12.0</version>
        </dependency>

增加配置

zookeeper.address=127.0.0.1:2181

增加注册类 ServiceRegister

@Component
public class ServiceRegister implements ApplicationRunner {

    @Value("${zookeeper.address}")
    private String zkAddress;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        CuratorFramework client = CuratorFrameworkFactory.newClient(zkAddress, new RetryOneTime(1000));
        client.start();
        client.blockUntilConnected();

        ServiceInstance<Object> instance = ServiceInstance.builder().name("product").address("127.0.0.1").port(8080).build();//注册了地址和端口
        ServiceDiscovery<Object> discovery = ServiceDiscoveryBuilder.builder(Object.class).client(client)
                .basePath("/soa").build();

        discovery.registerService(instance);
        discovery.start();
    }
}

可以再zookeeper客户端查看

ls /
ls /soa
ls /soa/product
get /soa/product/d5770a1f-640f-4b17-b5d0-bfb2fd4b0623

查看注册服务具体信息

{"name":"product","id":"d5770a1f-640f-4b17-b5d0-bfb2fd4b0623","address":"127.0.0.1","port":8080,"sslPort":null,"payload":null,"registrationTimeUTC":1523196340298,"serviceType":"DYNAMIC","uriSpec":null,"enabled":true}
cZxid = 0x10
ctime = Sun Apr 08 22:05:40 CST 2018
mZxid = 0x10
mtime = Sun Apr 08 22:05:40 CST 2018
pZxid = 0x10
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x1007c571a950003
dataLength = 216
numChildren = 0

2.3、调用方

pom

        <dependency>                
            <groupId>org.apache.curator</groupId>            
            <artifactId>curator-x-discovery</artifactId>       
            <version>2.12.0</version>
        </dependency>

在进行调用额时候，需要先从注册中心获取到服务地址，然后根据获取到的服务地址进行调用。

调用

    public static void main(String[] args) throws Exception {
        CuratorFramework client = CuratorFrameworkFactory.newClient("127.0.0.1:2181", new RetryOneTime(1000));
        client.start();
        client.blockUntilConnected();

        ServiceDiscovery<Object> discovery = ServiceDiscoveryBuilder.builder(Object.class).client(client)
                .basePath("/soa").build();

        Collection<ServiceInstance<Object>> instances = discovery.queryForInstances("product");

        instances.forEach((item) -> {
            System.out.println(item.getAddress());
            System.out.println(item.getPort());

            RestTemplate rt = new RestTemplate();
            String string = rt.getForObject("http://" + item.getAddress() + ":" + item.getPort() + "/soa/product/1",
                    String.class);
            System.out.println(string);
            Response<Product> fromJson = new Gson().fromJson(string, new TypeToken<Response<Product>>() {
            }.getType());

            System.out.println(new Gson().toJson(fromJson));
        });
    }