SpringBoot 之 SpringCloud 实战（二）

4. person服务模块

依赖

<?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>

    <parent>
        <artifactId>springCloud</artifactId>
        <groupId>com.abel</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>
    <artifactId>person</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</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-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
        </dependency>
        <dependency>
            <groupId>postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.1-901-1.jdbc4</version>
        </dependency>
    </dependencies>
</project>

关键代码

此处为关键代码，完整代码请看文章底部的git 地址

package com.abel.controller;
import com.abel.bean.Person;
import com.abel.dao.PersonRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * Created by yangyibo on 2018/6/27.
 */

@RestController
public class PersonController {
    @Autowired
    PersonRepository personRepository;

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public List<Person> savePerson(@RequestBody String personName) {
        Person p = new Person(personName);
        personRepository.save(p);
        List<Person> people = personRepository.findAll(new PageRequest(0, 10)).getContent();
        return people;
    }
}

配置

在resource 下新建application.yml 和bootstrap.yml文件
application.yml

server:
  port: 8082


spring:
  jpa:
    hibernate:
      ddl-auto: update

bootstrap.yml

spring:
  application:
    name: person
  cloud:
    config:
      enabled: true
      discovery:
        enabled: true
        service-id: CONFIG #1
eureka:
  instance:
    non-secure-port: ${server.port:8082}
  client:
    service-url:
      defaultZone: http://${eureka.host:localhost}:${eureka.port:8761}/eureka/

注意，在配置服务config 的resource 下新建config文件夹，并配置person 服务

在config 文件夹下新建person.yml 配置文件内容如下：

spring:
  jpa:
    database: HSQL 

5. some服务模块

依赖

<?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">
    <parent>
        <artifactId>springCloud</artifactId>
        <groupId>com.abel</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>some</artifactId>

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

</project>

关键代码

package com.abel;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by yangyibo on 2018/6/28.
 */
@SpringBootApplication
@EnableDiscoveryClient
@RestController
public class SomeApplication {
    @Value("${my.message}") //Value 值来自于config server
    private String message;

    @RequestMapping(value = "/getsome")
    public String getsome(){
        return message;
    }
    public static void main(String[] args) {
        SpringApplication.run(SomeApplication.class, args);
    }
}

配置

在resource 下新建application.yml 和bootstrap.yml文件
application.yml

server:
  port: 8083

bootstrap.yml

spring:
  application:
    name: some
  cloud:
    config:
      enabled: true
      discovery:
        enabled: true
        service-id: CONFIG
eureka:
  instance:
    non-secure-port: ${server.port:8083}
  client:
    service-url:
      defaultZone: http://${eureka.host:localhost}:${eureka.port:8761}/eureka/

注意，在配置服务config 的resource 下新建config文件夹，并配置some服务

在config 文件夹下新建some.yml 配置文件内容如下：

my:
  message: Message from Development

6. 界面模块-UI

依赖

  <parent>
        <artifactId>springCloud</artifactId>
        <groupId>com.abel</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ui</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-client</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-feign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>

        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>bootstrap</artifactId>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>angularjs</artifactId>
            <version>1.3.15</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>angular-ui-router</artifactId>
            <version>0.2.13</version>
        </dependency>
        <dependency>
            <groupId>org.webjars</groupId>
            <artifactId>jquery</artifactId>
        </dependency>
    </dependencies>

关键代码

package com.abel;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

/**
 * Created by yangyibo on 2018/6/29.
 */
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients //开启fegin 客户端支持
@EnableCircuitBreaker //开启CircuitBreaker的支持
@EnableZuulProxy //开启网关代理支持
public class UiApplication {
    public static void main(String[] args) {
        SpringApplication.run(UiApplication.class, args);
    }
}

调用 person的断路器 PersonHystrixService

package com.abel.service;

import com.abel.bean.Person;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
/**
 * Created by yangyibo on 2018/6/29.
 * 调用person service的断路器
 */
@Service
public class PersonHystrixService {

    @Autowired
    PersonService personService;

    @HystrixCommand(fallbackMethod = "fallbackSave") //使用HystrixCommand的fallbackMethod参数指定，调用失败的时候调用后备方法 fallbackMethod
    public List<Person> save(String name) {
        return personService.save(name);
    }

    public List<Person> fallbackSave(String name){
        List<Person> list = new ArrayList<Person>();
        Person p = new Person(name+"没有保存成功，Person Service 故障");
        list.add(p);
        return list;
    }
}

使用ribbo 调用some 服务并使用断路器

package com.abel.service;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

/**
 * Created by yangyibo on 2018/6/29.
 * 使用ribbon 调用some service 并使用断路器
 */
@Service
public class SomeHystrixService {

    @Autowired
    RestTemplate restTemplate; // springboot 下使用ribbon ，只需注入一个 RestTemplate，springboot 已经为我们做好了配置

    @HystrixCommand(fallbackMethod = "fallbackSome") //HystrixCommand 的参数指定，当调用失败时，使用备用方法fallbackMethod
    public String getSome() {
        return restTemplate.getForObject("http://some/getsome", String.class);
    }

    public String fallbackSome(){
        return "some service模块故障";
    }
}

配置

在resource 下新建application.yml 和bootstrap.yml文件
application.yml

server:
  port: 80

bootstrap.yml

spring:
  application:
    name: ui

eureka:
  instance:
    non-secure-port: ${server.port:80}
  client:
    service-url:
      defaultZone: http://${eureka.host:localhost}:${eureka.port:8761}/eureka/

7. 断路器监控

依赖

 <parent>
        <artifactId>springCloud</artifactId>
        <groupId>com.abel</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-turbine</artifactId>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>com.spotify</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <configuration>
                    <imageName>${project.name}:${project.version}</imageName>
                    <dockerDirectory>${project.basedir}/src/main/docker</dockerDirectory>
                    <skipDockerBuild>false</skipDockerBuild>
                    <resources>
                        <resource>
                            <directory>${project.build.directory}</directory>
                            <include>${project.build.finalName}.jar</include>
                        </resource>
                    </resources>
                </configuration>
            </plugin>
        </plugins>
    </build>

关键代码

package com.abel;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
import org.springframework.cloud.netflix.turbine.EnableTurbine;
/**
 * Created by yangyibo on 2018/6/29.
 */
@SpringBootApplication
@EnableEurekaClient
@EnableHystrixDashboard
@EnableTurbine
public class MonitorApplication {

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

配置

在resource 下新建application.yml 和 bootstrap.yml 文件
application.yml

server:
  port: 8989

bootstrap.yml

spring:
  application:
    name: monitor

eureka:
  instance:
    nonSecurePort: ${server.port:8989}
  client:
    serviceUrl:
      defaultZone: http://${eureka.host:localhost}:${eureka.port:8761}/eureka/

8.启动

我们一次启动 DiscoveryApplication、ConfigApplication，后面的所有微服务启动部分顺序，最后启动MonitorApplication。此时访问http://localhost:8761/，查看Eureka Server，如图:

(1) 访问UI服务

UI 服务是我们页面，也是我们的网关代理。在实际生产环境中，服务器防火墙只需将此端口暴露给外网即可，访问 http://localhost/#/person 如图

调用Person Service 服务 如图

调用some service 如图

（2）断路器

此时停止Person Service和SomeService，观察断路器的效果，界面会显示 服务故障

（3）断路器监控

访问http://localhost:8989/hystrix.stream 如图

输入 http://localhost/hystrix.stream 如图

监控界面如图

本文参考：《JavaEE开发的颠覆者：Spring Boot实战 》

本文完整源代码：https://github.com/527515025/springBoot/tree/master/springboot-springCloud