1 微服务实战系列 - SpringCloud注册中心

**注册中心解决问题：
1微服务注册标识，服务之间通信便于发现
2 相同服务多实例部署，增加服务延续性**

1 pom配置

 <!-- spring boot的parent 配置文件，有大部分spring boot需要用的Jar包 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.7</java.version>
    </properties>

    <profiles>
        <profile>
            <id>250</id>
            <properties>
                <!-- 系统参数 -->
                <instance.hostname>eureka-250</instance.hostname>
                <instance.address>123.207.218.250</instance.address>
                <serviceUrl.defaultZone>http://111.231.112.151:8001/eureka/</serviceUrl.defaultZone>
                <error.subject>register-250</error.subject>
            </properties>
        </profile>
        <profile>
            <id>151</id>
            <properties>
                <!-- 系统参数 -->
                <instance.hostname>eureka-151</instance.hostname>
                <instance.address>111.231.112.151</instance.address>
                <serviceUrl.defaultZone>http://123.207.218.250:8001/eureka/</serviceUrl.defaultZone>
                <error.subject>register-151</error.subject>
            </properties>
        </profile>
    </profiles>

    <dependencies>
        <!-- eureka-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <!-- spring boot-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- spring security -->
        <!-- <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency> -->
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!-- spring boot的maven打包插件 -->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <configuration>
                    <encoding>utf-8</encoding>
                    <useDefaultDelimiters>true</useDefaultDelimiters>
                </configuration>
            </plugin>
        </plugins>
        <finalName>register</finalName><!-- 包名 -->
    </build>

2 程序入口

package com.ttd;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.google.common.collect.Maps;

@EnableEurekaServer
@SpringBootApplication
@RestController
public class ServiceCenterApplication {
@Autowired DiscoveryClient discoveryClient;

public static void main(String[] args) {
SpringApplication.run(ServiceCenterApplication.class, args);
}

@RequestMapping("/info")
public String info() {
List<String> services = discoveryClient.getServices();
Map<String, Object> re = Maps.newHashMap();
for(String temp : services){
re.put(temp, discoveryClient.getInstances(temp));
}
return re.toString();
}
}

3 应用配置

#\u6ce8\u518c\u670d\u52a1\u7684\u7aef\u53e3\u53f7
server.port=8001
spring.application.name=register
#eureka.instance.hostname=${instance.hostname}
eureka.instance.prefer-ip-address=true
eureka.instance.ip-address=${instance.address}
eureka.environment=product

#client register yes or no?
eureka.client.register-with-eureka=true
#Indicates whether this client should fetch eureka registry information from eureka\n server
eureka.client.fetch-registry=true
#cross register
eureka.client.serviceUrl.defaultZone=${serviceUrl.defaultZone}

#eureka server清理无效节点的时间间隔，默认60000毫秒，即60秒
eureka.servere.viction-interval-timer-in-ms=3000
#self-protected model
eureka.server.enable-self-preservation=true