SpringCloud入门(四) ------Eureka服务注册与发现

Eureka注册服务：

Pom文件依赖：

<?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>
        <artifactId>jymcloudservice</artifactId>
        <groupId>com.jym</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../jymcloudservice/pom.xml</relativePath>
    </parent>

    <groupId>com.jym</groupId>
    <artifactId>jymcloudservice-provider</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <artifactId>jymcloudservice-common</artifactId>
            <groupId>com.jym</groupId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <version>1.5.12.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>


</project>

启动类加入 EnableEurekaClient注解

package com.jym.deptprovider;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @program: cloudTest
 * @description:
 * @author: jym
 * @create: 2020/02/25
 */
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@MapperScan("com.jym.deptprovider.dao")
@EnableEurekaClient   //开启eureka客户端
@EnableDiscoveryClient  // 开启注册发现
public class JymProvider8001 {
    public static void main(String[] args) {
        SpringApplication.run(JymProvider8001.class,args);
    }
}

yml:

server:
  port: 8001
mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.jym.jymcloudservice.entity    # 所有Entity别名类所在包
  mapper-locations:
  - classpath:mybatis/mapper/*.xml                       # mapper映射文件
spring:
  application:
    name: jymservicecloud-dept
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: com.mysql.jdbc.Driver             # mysql驱动包
    url: jdbc:mysql://localhost:3306/clouddb01?useSSL=true&serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8              # 数据库名称
    username: root
    password: admin
  dbcp2:
    min-idle: 5                                           # 数据库连接池的最小维持连接数
    initial-size: 5                                       # 初始化连接数
    max-total: 5                                          # 最大连接数
    max-wait-millis: 200                                  # 等待连接获取的最大超时时间

eureka:
  client: #客户端注册进eureka服务列表内
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/
  instance:
    instance-id: jymservicecloud-dept8001  #修改eureka 	Status中的内容
    prefer-ip-address: true  # 超链接IP提示

# 超链接内容
info:
  app.name: jym-deptservicecloud
  company.name: com.jym.springcloud
  build.artifactId: $project.artifactId$
  build.version: $project.version$

defaultZone: 服务注册地址(Eureka服务的地址)。
instance-id: 修改页面Status中的内容

prefer-ip-address: 鼠标悬浮时超链接IP提示(左下角)

但是设置完，点进去报错，因为还没设置info
父pom文件中需要安装插件:
该插件可以读取$$之间的内容

<build>
        <finalName>jymcloudservice</finalName>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <configuration>
                    <delimiters>
                    <delimit>$</delimit>
                    </delimiters>
                </configuration>
            </plugin>
        </plugins>
    </build>

info:
  app.name: jym-deptservicecloud
  company.name: com.jym.springcloud
  build.artifactId: $project.artifactId$
  build.version: $project.version$

这里的$$内容可以从配置文件中读取
配置完成之后，点击超链接：

服务发现:

启动类上 加入EnableDiscoveryClient注解，开启服务发现

package com.jym.deptprovider;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * @program: cloudTest
 * @description:
 * @author: jym
 * @create: 2020/02/25
 */
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@MapperScan("com.jym.deptprovider.dao")
@EnableEurekaClient   //开启eureka客户端
@EnableDiscoveryClient  // 开启注册发现
public class JymProvider8001 {
    public static void main(String[] args) {
        SpringApplication.run(JymProvider8001.class,args);
    }
}

controller 层 注入DiscoveryClient类

package com.jym.deptprovider.controller;

import com.jym.deptprovider.service.DeptService;
import com.jym.jymcloudservice.entity.Dept;
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;

/**
 * @program: cloudTest
 * @description:
 * @author: jym
 * @create: 2020/02/25
 */
@RestController
@RequestMapping("/dept")
public class DeptController {
   
    @Autowired
    private DiscoveryClient discoveryClient;


    @RequestMapping(value = "/discovery",method = RequestMethod.GET)
    public Object discovery () {
        List<String> services = discoveryClient.getServices();
        System.out.println(services);
        List<ServiceInstance> instances = discoveryClient.getInstances("JYMSERVICECLOUD-DEPT");
        for (ServiceInstance instance : instances) {
            System.out.println("id为"+instance.getServiceId());
            System.out.println(instance.getHost()+":"+instance.getPort()+"/"+instance.getUri());
        }
        return this.discoveryClient;
    }


}
    

启动eureka然后启动服务访问页面成功:

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