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微服务示例-Spring Cloud

微服务示例-Spring Cloud

作者: Java微服务 | 来源:发表于2019-01-10 15:58 被阅读4次

1~开发准备

　JDK:1.8

　　Spring Boot:1.5.9.RELEASE

　　Spring Coud:Edgware.RELEASE

　　IDE:IntelliJ IDEA 2017

　　Maven:3.3.9

2~创建服务注册中心

File->New->Projects->Spring Initializr

image

点击Next,填写信息如下:

image

然后点击Next,选择如下:

image 点击Next,然后点击Finish.项目结构如下: image

其中pom.xml文件内容如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;"><?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>com.human</groupId>
<artifactId>sbc-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>sbc-service</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<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>Edgware.RELEASE</spring-cloud.version>
</properties>

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

</project></pre>

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项目初始化完成,修改resources文件夹下application.properties文件,内容如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">server.port=8081
spring.application.name=human-service
eureka.instance.hostname=localhost
eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.client.serviceUrl.defaultZone=http://{eureka.instance.hostname}:{server.port}/eureka/</pre>

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然后修改主程序代码如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">package com.human.sbcservice; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer public class SbcServiceApplication { public static void main(String[] args) {
SpringApplication.run(SbcServiceApplication.class, args);
}
}</pre>

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至此,一个微服务注册中心完成

3~创建微服务提供者

大体上与创建注册中心相同,在选择依赖的时候如下图

image

选择完毕,点击Next,然后点击Finish,完成后项目结构如图:

image

pom.xml代码如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;"><?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>com.human</groupId>
<artifactId>sbc-user</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>sbc-user3</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<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>Edgware.RELEASE</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</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>
        <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>

</project></pre>

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然后打开主程序文件,修改代码如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">package com.human.sbcuser; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient//Eureka微服务注解
@SpringBootApplication public class SbcUserApplication { public static void main(String[] args) {
SpringApplication.run(SbcUserApplication.class, args);
}
}</pre>

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修改application.properties文件,内容如下:

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">server.port=8082
eureka.client.service-url.defaultZone=http://localhost:8081/eureka/
spring.application.name=cloud-simple-service</pre>

新建一个名为HelloController文件,具体代码:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">package com.human.sbcuser; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody;

@Controller public class HelloController {
@RequestMapping("/")
@ResponseBod public String hello()
{ return "hello KinY ~KoKo";
}
}</pre>

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](javascript:void(0); "复制代码")

至此,一个简单的服务提供者创建完毕

4~创建微服务消费者

利用Rbbon创建客户端,其中group:com.human,Artifact:sbc-consumer,剩下基本上与创建注册中心相同,其中选择依赖时如下图:

image

完成后,pom.xml文件内容如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;"><?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>com.human</groupId>
<artifactId>sbc-consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>sbc-service</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<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>Edgware.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-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-ribbon</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>

</project></pre>

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修改程序主类,内容如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">package com.human.sbconsumer; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.client.loadbalancer.LoadBalanced; import org.springframework.context.annotation.Bean; import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient
@SpringBootApplication public class SbcConsumerApplication {

@Bean
@LoadBalanced
RestTemplate restTemplate(){ return  new RestTemplate();
} public static void main(String[] args) {
    SpringApplication.run(SbcConsumerApplication.class, args);
}

}</pre>

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修改配置文件application.properties,内容如下:

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">server.port=8083
eureka.client.service-url.defaultZone=http://localhost:8081/eureka/
spring.application.name=cloud-simple-consumer</pre>

新增HelloController文件,内容如下:

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<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: "Courier New" !important; font-size: 12px !important;">package com.human.sbconsumer; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate;

@RestController public class HelloController {
@Autowired
RestTemplate restTemplate;
@RequestMapping("/") public String hello()
{ return restTemplate.getForEntity("http://cloud-simple-service/",String.class).getBody();
}
}</pre>

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至此编码完成.

5~运行

先运行注册中心项目(sbc-service),然后运行服务提供者项目(sbc-user),打开浏览器输入地址:http://localhost:8081/,显示内容如下:

image

其中红色框内,说明服务提供者注册成功,此时访问地址:http://localhost:8082/ 输出文本:hello KinY ~KoKo,说明服务提供者正常运行,下面运行服务消费者(sbc-consumer),再访问http://localhost:8081/ 发现变成如下内容:

image

说明服务客户端也成功注册,下面直接访问 http://localhost:8083/ 浏览器输出文本:hello KinY ~KoKo 大功告成!!
至此一个简配的微服务架构搭建完毕.

6~补充

①:在选择端口时注意不要与其他程序冲突
　　②:其中消费者基于Ribbon创建,Ribbon是基于http和tcp的客户端负载均衡器


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