什么是Eureka组件

spring cloud Eureka ，提供服务注册和服务发现的功能。

一：spring cloud Eureka

Eureka Server 服务端

Eureka Client 客户端

服务注册

代码实现：

1.pom.xml

<?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>

    <groupId>org.example</groupId>

    <artifactId>springCloud01</artifactId>

    <packaging>pom</packaging>

    <version>1.0-SNAPSHOT</version>

    <modules>

        <module>EurekaServer</module>

    </modules>

    <!--    父工程-->

    <parent>

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

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

        <version>2.0.7.RELEASE</version>

    </parent>

    <dependencies>

        <dependency>

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

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

        </dependency>

        <!--        JDk9-->

        <dependency>

            <groupId>javax.xml.bind</groupId>

            <artifactId>jaxb-api</artifactId>

            <version>2.3.0</version>

        </dependency>

        <dependency>

            <groupId>com.sun.xml.bind</groupId>

            <artifactId>jaxb-impl</artifactId>

            <version>2.3.0</version>

        </dependency>

        <dependency>

            <groupId>org.glassfish.jaxb</groupId>

            <artifactId>jaxb-runtime</artifactId>

            <version>2.3.0</version>

        </dependency>

        <dependency>

            <groupId>javax.activation</groupId>

            <artifactId>activation</artifactId>

            <version>1.1.1</version>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

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

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

                <version>Finchley.SR2</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

2.父工程下实现一个子模块Module实现Eureka Server

<?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">

    <parent>

        <artifactId>springCloud01</artifactId>

        <groupId>org.example</groupId>

        <version>1.0-SNAPSHOT</version>

    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>EurekaServer</artifactId>

    <dependencies>

        <dependency>

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

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

        </dependency>

    </dependencies>

</project>

3.配置文件

server:

  port: 8761

eureka:

  client:

    register-with-eureka: false

    fetch-registry: false

    service-url:

      defaultZone: http://localhost:8761/eureka/

4.创建启动类：

package com.southwind;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer

@SpringBootApplication

public class EuiekaServerApplication {

    public static void main(String[] args) {

        SpringApplication.run(EuiekaServerApplication.class,args);

    }

}

5.检查打开

http://localhost:8761

注册第一个微服务

服务提供者

服务消费者和服务提供者都是通过Eureka Client 连接到Eureka Server完成注册。

1.创建一个模块，实现Eureka Client

<?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">

    <parent>

        <artifactId>springCloud01</artifactId>

        <groupId>org.example</groupId>

        <version>1.0-SNAPSHOT</version>

    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>provider</artifactId>

    <dependencies>

        <dependency>

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

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

    </dependencies>

</project>

2.配置文件：

server:

  port: 8010

spring:

  application:

    name: provider

eureka:

  client:

    service-url:

      defaultZone: http://localhost:8761/eureka/

  instance:

    prefer-ip-address: true

3.创建启动类：

package com.southwind;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class ProvideApplication {

    public static void main(String[] args) {

        SpringApplication.run(ProvideApplication.class,args);

    }

}

4.数据持久化：

接口：

package com.southwind.repository;

import com.southwind.entity.Student;

import java.util.Collection;

public interface StudentRepository {

    public Collection<Student> findAll();

    public Student findById(Integer id);

    public  void saveOrUpdate(Student student);

    public void deleteById(Integer id);

}

实现类：

package com.southwind.repository.impl;

import com.southwind.entity.Student;

import com.southwind.repository.StudentRepository;

import java.util.Collection;

import java.util.HashMap;

import java.util.Map;

public class StudentRepositoryImpl implements StudentRepository {

    private static Map<Integer,Student> map;

    static {

        map=new HashMap<>();

        map.put(1,new Student(1,"张三"));

        map.put(1,new Student(2,"李四"));

        map.put(1,new Student(3,"王五"));

    }

    @Override

    public Collection<Student> findAll() {

        return map.values();

    }

    @Override

    public Student findById(Integer id) {

        return map.get(id);

    }

    @Override

    public void saveOrUpdate(Student student) {

        map.put(student.getId(),student);

    }

    @Override

    public void deleteById(Integer id) {

        map.remove(id);

    }

}

Handler：

package com.southwind.Handler;

import com.southwind.entity.Student;

import com.southwind.repository.StudentRepository;

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

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

import java.util.Collection;

@RestController

@RequestMapping("/provider")

public class StudentHandler {

    @Autowired

    private StudentRepository studentRepository;

    @GetMapping("/findall")

    public Collection<Student> findall(){

        return studentRepository.findAll();

    }

    @GetMapping("/findbyid/{id}")

    public Student findById(@PathVariable("id") Integer id){

        return studentRepository.findById(id);

    }

    @PostMapping("/save")

    public void save(@RequestBody Student student){

        studentRepository.saveOrUpdate(student);

    }

    @DeleteMapping("/delete")

    public void deletebyid(Integer id){

        studentRepository.deleteById(id);

    }

}

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