SpringCloud的学习记录(2)

这一章节主要讲如何搭建eureka-client项目.

在我们生成的Demo项目上右键点击New->Module->spring Initializr, 然后next, 填写Group和Artifact等信息，

这里Artifact填写eurekaclient, 再次next,

这里选择的Web下的web和Cloud Discovery下的Eureka Discovery.

最后在Module Name中填写eureka-client.

生成的pom.xml文件如下:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.3.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.xum</groupId>

    <artifactId>eureka-client</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>eureka-client</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <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-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>${spring-cloud.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

    <repositories>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

        </repository>

    </repositories>

</project>

然后在EurekaClientApplication上加@EnableEurekaClient注解:

package com.xum.eurekaclient;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient

@SpringBootApplication

public class EurekaClientApplication {

    public static void main(String[] args) {

        SpringApplication.run(EurekaClientApplication.class, args);

    }

}

然后新建application.yml文件, 内容如下:

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8761/eureka/    这里的defaultZone是上一章节的对应eureka-server

server:

  port: 8762

spring:

  application:

    name: eureka-client

然后写一个controller去获取数据, 这里是获取git上的数据, 关于config-server的项目下一章节说

package com.xum.eurekaclient.controller;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.cloud.client.ServiceInstance;

import org.springframework.cloud.client.discovery.DiscoveryClient;

import org.springframework.cloud.context.config.annotation.RefreshScope;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.RestController;

import java.lang.reflect.Method;

import java.util.List;

@RefreshScope   //这里加上RefreshScope注解,这样才能获取到git上的内容

@RestController

@RequestMapping(value = "/testone")

public class TestOneController {

    private static final Logger LOG = LoggerFactory.getLogger(TestOneController.class);

    @Autowired

    private DiscoveryClient discoveryClient;

    @Value("${server.port}")

    String port;

    /* from git config */

    @Value("${democonfigclient.message}")

    String message;

    /* from git config */

    @Value("${foo}")

    String foo;

    @RequestMapping(value = "/test")

    public String test(@RequestParam(value = "name", required = false, defaultValue = "testOneClient")String name) {

        /*List<ServiceInstance> list = discoveryClient.getInstances("eureka-client");

        LOG.info("discoveryClient.getServices().size() = " + discoveryClient.getServices().size());

        for( String s :  discoveryClient.getServices()){

            List<ServiceInstance> serviceInstances =  discoveryClient.getInstances(s);

            for(ServiceInstance si : serviceInstances){

                LOG.info("services:" + s + ":getHost()=" + si.getHost());

                LOG.info("services:" + s + ":getPort()=" + si.getPort());

                LOG.info("services:" + s + ":getServiceId()=" + si.getServiceId());

                LOG.info("services:" + s + ":getUri()=" + si.getUri());

            }

        }*/

        String info = "Hi " + name + ", this is EurekaClient, port is " + port;

        return info;

    }

    @RequestMapping(value = "/config", method = RequestMethod.GET)

    public String config() {

        String info = "port:" + port + ",message:" + message + ",foo:" + foo;

        return info;

    }

}

最后通过Run DashBoard运行项目,

首先运行上一章节的eureka-server项目, 然后运行eureka-client的项目.

在浏览器上输入http://localhost:8761,显示如下: (我这里同时运行了config-server项目, 这个项目下一章节讲)

先在浏览器中输入http://localhost:8762/testone/test, 显示如下

port是eureka-client的端口

然后在浏览器中输入http://localhost:8762/testone/config, 显示如下

port是eureka-client的端口, message和foo是从git仓库中获取的, 是通过config-server项目获取的.

下一章节讲config-server项目的搭建.

巴特西

SpringCloud的学习记录(2)

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