第一个Eureka程序

一关于Eureka

1 提供了Eureka服务端与客户端

2 主要用于服务管理

二 Eureka的架构

三构建第一个项目步骤

1 建立服务器端

2 建立服务提供者

3 建立服务调用者

四建立服务端——first-114

1 依赖查找网站：

http://projects.spring.io/spring-cloud/

http://cloud.spring.io/spring-cloud-static/Dalston.SR3/

2 增加依赖

      <dependencyManagement>
            <dependencies>
                  <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-dependencies</artifactId>
                        <version>Dalston.SR3</version>
                        <type>pom</type>
                        <scope>import</scope>
                  </dependency>
            </dependencies>
      </dependencyManagement>
      
      <dependencies>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-eureka-server</artifactId>
            </dependency>
      </dependencies>

3 编写一个启动类

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class ServerApp {

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

}

4 编辑配置文件

server:
  port: 8761
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false

5 测试

五建立服务提供者——first-police

1 新建依赖

<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/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>org.crazyit.cloud</groupId>
      <artifactId>first-police</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <dependencyManagement>
            <dependencies>
                  <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-dependencies</artifactId>
                        <version>Dalston.SR3</version>
                        <type>pom</type>
                        <scope>import</scope>
                  </dependency>
            </dependencies>
      </dependencyManagement>
      <dependencies>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-eureka</artifactId>
            </dependency>
      </dependencies>
</project>

2 新建启动类

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class PoliceServer {

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

}

3 新建一个实体类

package org.crazyit.cloud;
public class Police {
      private Integer id;
      private String name;
      public Integer getId() {
            return id;
      }
      public void setId(Integer id) {
            this.id = id;
      }
      public String getName() {
            return name;
      }
      public void setName(String name) {
            this.name = name;
      }
      
}

4 新建一个控制类

package org.crazyit.cloud;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class PoliceController {

    @RequestMapping(value = "/call/{id}", method = RequestMethod.GET,
            produces = MediaType.APPLICATION_JSON_VALUE)
    public Police call(@PathVariable Integer id) {
        Police p = new Police();
        p.setId(id);
        p.setName("angus");
        return p;
    }
}

5 新建配置文件

spring:
  application:
    name: first-police
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

6 测试

六建立服务消费者——first-persion

1 新建依赖

<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/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>org.crazyit.cloud</groupId>
      <artifactId>first-person</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      
      <dependencyManagement>
            <dependencies>
                  <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-dependencies</artifactId>
                        <version>Dalston.SR3</version>
                        <type>pom</type>
                        <scope>import</scope>
                  </dependency>
            </dependencies>
      </dependencyManagement>
      <dependencies>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-config</artifactId>
            </dependency>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-eureka</artifactId>
            </dependency>
            <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-starter-ribbon</artifactId>
            </dependency>
      </dependencies>
      
</project>

2 建立一个启动类

package org.crazyit.cloud;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class PersonServer {

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

}

3 新建配置文件

server:
  port: 8081
spring:
  application:
    name: first-person
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/

4 编写控制类

package org.crazyit.cloud;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.client.RestTemplate;

@Controller
@Configuration
public class TestController {
    
    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }

    @GetMapping("/router")
    @ResponseBody
    public String router() {
        RestTemplate tpl = getRestTemplate();
        String json = tpl.getForObject("http://first-police/call/1", String.class);
        return json;
    }

}

5 测试

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