服務治理

服務治理是微服務架構中最為核心和基礎的模組，主要用來實現各個微服務例項的自動話註冊和發現。

搭建服務註冊中

首先，建立一個基礎SpringBoot工程,命名為lemon-eurkea（命名自己隨意）,並在pom.xml中引入需要的依賴內容,程式碼如下：

<parent>
    <groupId>com.lemon</groupId>
    <artifactId>lemon</artifactId>
    <version>0.0.1</version>
  </parent>
  <artifactId>lemon-eureka</artifactId>
  <packaging>jar</packaging>
  <description>springcloud註冊中心</description>
  
  <dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka-server</artifactId>
    </dependency>
  </dependencies>
  
  <build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
  </build>
 

這裡我是依賴了一個父工程，父工程的pom配置為：

<!-- Spring Boot 啟動父依賴 -->
  <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.5.4.RELEASE</version>
  </parent>
  
  <properties>
  	<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	<java.version>1.8</java.version>
	<maven.compiler.source>1.8</maven.compiler.source>
	<maven.compiler.target>1.8</maven.compiler.target>
  	<lemon-version>0.0.1</lemon-version>
  	<springboot.version>1.5.2.RELEASE</springboot.version>
  	<mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
	<druid.version>1.0.26</druid.version>
	<fastjson.version>1.2.24</fastjson.version>
    <pagehelper.spring.boot.version>1.2.0</pagehelper.spring.boot.version>
    <joda.time.version>2.9.9</joda.time.version>
    <shiro.version>1.3.2</shiro.version>
    <jsch.version>0.1.54</jsch.version>
  </properties>
  
  <dependencies>
    <!-- Spring Boot Web 依賴 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
	<!-- Springboot 熱部署 -->
	<dependency>
	    <groupId>org.springframework.boot</groupId>
	    <artifactId>spring-boot-devtools</artifactId>
	    <optional>true</optional>
	</dependency>
	
	<dependency>  
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-test</artifactId>  
        <scope>test</scope>  
    </dependency>
	
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
	</dependency>
	
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>fastjson</artifactId>
		<version>${fastjson.version}</version>
	</dependency>
	
	<dependency>
	    <groupId>joda-time</groupId>
	    <artifactId>joda-time</artifactId>
	</dependency>
	
  </dependencies>
  
  <dependencyManagement>
  	<dependencies>
  		<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Dalston.SR4</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
  	
  		<dependency>
		    <groupId>org.mybatis.spring.boot</groupId>
		    <artifactId>mybatis-spring-boot-starter</artifactId>
		    <version>${mybatis.spring.boot.version}</version>
		</dependency>
  	
  		<dependency>
		    <groupId>com.github.pagehelper</groupId>
		    <artifactId>pagehelper-spring-boot-starter</artifactId>
		    <version>${pagehelper.spring.boot.version}</version>
		</dependency>
  		
		<!-- druid阿里巴巴資料庫連線池 -->
	    <dependency>
	        <groupId>com.alibaba</groupId>
	        <artifactId>druid</artifactId>
	        <version>${druid.version}</version>
	    </dependency>
	  
        <dependency>
			<groupId>org.apache.shiro</groupId>
			<artifactId>shiro-core</artifactId>
			<version>${shiro.version}</version>
		</dependency>
		<dependency>
			<groupId>org.apache.shiro</groupId>
			<artifactId>shiro-spring</artifactId>
			<version>${shiro.version}</version>
		</dependency>
		
		<!-- https://mvnrepository.com/artifact/com.jcraft/jsch -->
		<dependency>
		    <groupId>com.jcraft</groupId>
		    <artifactId>jsch</artifactId>
		    <version>${jsch.version}</version>
		</dependency>
  	</dependencies>
  </dependencyManagement>
 

通過@EnableEurekaServer註解啟動一個服務註冊中心提供給其他應用進行對話。

@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {
	
	public static void main(String[] args) {
        new SpringApplicationBuilder(EurekaApplication.class)
                    .web(true).run(args);
    }
}
 

在預設設定下，該服務註冊中心也會將自己作為客戶端來嘗試註冊它自己，所以我們需要禁用它的客戶端註冊行為，只需要在application.properties配置檔案中增加如下資訊：

spring.application.name=lemon-eureka
server.port=1001

eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false