springcloud微服务探索之完整demo的记录与分析_springcloud 完整demo

Erueka服务器的建立

Spring Cloud Eureka是Spring Cloud Netflix微服务套件中的一部分，它基于Netflix Eureka做了二次封装。主要负责完成微服务架构中的服务治理功能。什么事服务注册：在服务治理框架中，通常都会构建一个注册中心，每个服务单元向注册中心登记自己提供的服务，包括服务的主机与端口号、服务版本号、通讯协议等一些附加信息。注册中心按照服务名分类组织服务清单，同时还需要以心跳检测的方式去监测清单中的服务是否可用，若不可用需要从服务清单中剔除，以达到排除故障服务的效果。

项目都是基于springboot项目的，

1.建立项目

2.配置pom文件

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

3.书写配置文件

server:
 port: 1000
eureka:
 instance:
 hostname:  localhost
 client:
register-with-eureka: false
fetch-registry: false
spring:
 application:
 name: eureka-server

在默认配置下，Eureka Server会将自己也作为客户端来尝试注册自己，我们需要禁用它的客户端禁用行为。

下面是一个Eureka Server的application.properites的相关配置：

#服务注册中心端口号

server.port=1110

#服务注册中心实例的主机名

eureka.instance.hostname=localhost

#是否向服务注册中心注册自己

eureka.client.register-with-eureka=false

#是否检索服务

eureka.client.fetch-registry=false

#服务注册中心的配置内容，指定服务注册中心的位置

启动项目

4.测试，输入地址栏地址

客户端项目建立：

1.新建springboot项目

2.pom文件和上边一只

3.配置文件（yml文件）

eureka: 
 client: 
  serviceUrl: 
   defaultZone: http://127.0.0.1:1000/eureka/
spring: 
 application: 
  name: client-service1
server: 
 port: 2000a

 4.启动类和controller放在一起（简单方便）

package com.eureka;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@Configuration
@ComponentScan
@EnableEurekaClient
@EnableAutoConfiguration
@RestController
public class  ApplicationClient{
	public static void main(String[] args) {
		SpringApplication.run(ApplicationClient.class, args);
	}
	 @RequestMapping(value = "hello",method = RequestMethod.GET)
	    public String hello(){
	        return "你好,世界";
	    }
 
}

启动项目，再次查看上边的服务地址，结果如下：

Feign客户端项目建立

1.建立springboot项目

2.pom文件

<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>
		<groupId>org.springframework.boot</groupId>
		 <artifactId>spring-boot-starter-parent</artifactId>
		 <version>1.5.6.RELEASE</version>
	</parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.feign.demo</groupId>
  <artifactId>feign</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
  <plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
</build>
  	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>
  <dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-feign</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-eureka</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>Camden.SR6</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
		
  
  
</project>

2. 配置文件

server:
  port: 8081
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:1000/eureka/

3.启动类，controller，接口

package com.feign.demo;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
 
@Configuration
@ComponentScan
@EnableAutoConfiguration
@EnableEurekaClient
@EnableFeignClients
@SpringBootApplication
public class FeignApplication {
	public static void main(String[] args) {
		SpringApplication.run(FeignApplication.class, args);
	}
}
 
 
 
package com.feign.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
    @Autowired
    private IHello iHello;
    @RequestMapping(value = "gethello",method = RequestMethod.GET)
    public String getHello(){
       return iHello.getHello();
    }
}
 
 
package com.feign.demo;
 
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@FeignClient("client-service1")
public interface IHello {
    @RequestMapping(value = "/hello",method = RequestMethod.GET)
    String getHello();
}
 
 

@FeignClient("client-service1")里边参数是调用服务的服务名称。在具体方法里可以通过RequestMapping来直接请求对应服务的url. 

4.访问controller接口