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SpringCloud入门案例/eureka注册中心

项目结构

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配置文件

  1. pom.xml(父模块)

    <?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.xiaoge.demo</groupId>
    <artifactId>cloud-demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>user-service</module>
        <module>consumer-demo</module>
        <module>eureka-server</module>
    </modules>
    <packaging>pom</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.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>Finchley.SR1</spring-cloud.version>
        <mapper.starter.version>2.0.3</mapper.starter.version>
        <mysql.version>5.1.32</mysql.version>
    </properties>

    <dependencyManagement> <!-- 所有子工程, 必须引下面的依赖才会有 -->
        <dependencies>
            <!-- spring cloud 引用了它, 以后cloud依赖版本就不用写了 -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

            <!-- 通用Mapper启动器 -->
            <dependency>
                <groupId>tk.mybatis</groupId>
                <artifactId>mapper-spring-boot-starter</artifactId>
                <version>${mapper.starter.version}</version>
            </dependency>

            <!-- mysql驱动 -->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>

        </dependencies>
    </dependencyManagement>

    <dependencies> <!-- 因为不会再dependencyManagement标签里, 所以所有的子工程都可以用 -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

  2. pom.xml(子模块: user-service)

    <?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>cloud-demo</artifactId>
        <groupId>com.xiaoge.demo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>user-service</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
        </dependency>

        <!-- 引入eureka(注册中心)-客户端 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

  3. pom.xml(子模块: eureka-server)

    <?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>cloud-demo</artifactId>
        <groupId>com.xiaoge.demo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>eureka-server</artifactId>

    <dependencies>
        <!-- springcloud 注册中心 eureka -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

</project>

  4. pom.xml(子模块: consumer-demo)

    <?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>cloud-demo</artifactId>
        <groupId>com.xiaoge.demo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>consumer-demo</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 引入eureka客户端依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>

</project>

  5. application.yml(子模块: user-service)

    server:
  port: 9090
spring:
  # 在eureka中注册的服务名称
  application:
    name: user-service
  # 数据库连接信息配置
  datasource:
    url: jdbc:mysql://localhost:3306/yun6
    username: root
    password: root
    hikari:
      maximum-pool-size: 20
      minimum-idle: 10
# 别名包
mybatis:
  type-aliases-package: com.xiaoge.user.pojo

# 注册方
# eureka配置 因为它要去注册中心注册, 所以要配置
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka

  6. application.yml(子模块: eureka-server)

    # 这是eureka的默认端口号
server:
  port: 8761

# 配置eureka服务名称
spring:
  application:
    name: eureka-server

# 注册方
# 告诉eureka要注册的地址在哪里 (这样eureka就不会报一个com.sun.jersey.api.client.ClientHandlerException异常)
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka
  instance:
    prefer-ip-address: true # 我希望使用ip地址
    ip-address: 127.0.0.1 # 设置ip地址

  7. application.yml(子模块: consumer-demo)

    server:
  port: 8088
spring:
  # 在eureka中注册的服务名称
  application:
    name: consumer-service

# 注册方
# eureka配置 因为它要去注册中心注册, 所以要配置
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka

实现类

  1. User(子模块: user-service)

    package com.xiaoge.user.pojo;

import lombok.Data;
import tk.mybatis.mapper.annotation.KeySql;

import javax.persistence.Id;
import javax.persistence.Table;
import java.io.Serializable;
import java.util.Date;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:46
 **/
@Table(name = "tb_user")
@Data
public class User implements Serializable {

    @Id
    @KeySql(useGeneratedKeys = true) // id自动增长
    private Long id;

    // 用户名
    private String username;

    // 密码
    private String password;

    // 姓名
    private String name;

    // 年龄
    private Integer age;

    // 性别，1男性，2女性
    private Integer sex;

    // 出生日期
    private Date birthday;

    // 创建时间
    private Date created;

    // 更新时间
    private Date updated;

    // 备注
    private String note;

}

  2. User(子模块: consumer-demo)(注意: 因为他要调用user-service系统资源所以要写一个实体类来映射数据)

    package com.xiaoge.Consumer.pojo;

import lombok.Data;

import java.io.Serializable;
import java.util.Date;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 16:06
 **/
@Data
public class User implements Serializable {
    // 主键
    private Long id;

    // 用户名
    private String username;

    // 密码
    private String password;

    // 姓名
    private String name;

    // 年龄
    private Integer age;

    // 性别，1男性，2女性
    private Integer sex;

    // 出生日期
    private Date birthday;

    // 创建时间
    private Date created;

    // 更新时间
    private Date updated;

    // 备注
    private String note;

}

持久层

  1. UserMapper(子模块: user-service)

    package com.xiaoge.user.mapper;


import com.xiaoge.user.pojo.User;
import tk.mybatis.mapper.common.Mapper;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:49
 **/

public interface UserMapper extends Mapper<User> {
}

业务层

  1. UserService接口(子模块: user-service)

    package com.xiaoge.user.service;

import com.xiaoge.user.pojo.User;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:50
 **/
public interface UserService {

    public User queryById(Long id);

}

  2. UserServiceImpl实现类(子模块: user-service)

    package com.xiaoge.user.service.impl;

import com.xiaoge.user.mapper.UserMapper;
import com.xiaoge.user.pojo.User;
import com.xiaoge.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:51
 **/
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public User queryById(Long id) {
        return userMapper.selectByPrimaryKey(id);
    }
}

表现层

  1. UserController(子模块: user-service)

    package com.xiaoge.user.controller;

import com.xiaoge.user.pojo.User;
import com.xiaoge.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @program: cloud-demo
 * @description:
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:51
 **/
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/{id}")
    public User queryById(@PathVariable("id") Long id) {
        User user = userService.queryById(id);
        return user;
    }

}

  2. ConsumerController(子模块: consumer-demo)

    package com.xiaoge.Consumer.controller;

import com.xiaoge.Consumer.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.List;

/**
 * @program: cloud-demo
 * @description: 动态拉取服务列表
 * @author: Mr.Xiao
 * @create: 2020-05-04 16:08
 **/
@RestController
@RequestMapping("/consumer")
public class ConsumerController {

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private DiscoveryClient discoveryClient; // 专门负责服务发现

    @GetMapping("/{id}")
    public User queryById(@PathVariable("id") Long id){
        // 拉取服务  根据服务id获取实例
        List<ServiceInstance> instances = discoveryClient.getInstances("user-service");

        // 获取第一个实例, 从实例当中取出ip和端口
        ServiceInstance instance = instances.get(0); // 这个位置正常情况下, 要写负载均衡算法, 我这里是随便取得

        // 获取ip
        String ip = instance.getHost();

        // 获取端口
        int port = instance.getPort();

        // 访问的地址
        String url = "http://" + ip + ":" + port;

        User user = restTemplate.getForObject(url + "/user/" + id, User.class);
        return user;
    }

}

引导类

  1. UserApplication(子模块: user-service)

    package com.xiaoge;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import tk.mybatis.spring.annotation.MapperScan;

/**
 * @program: cloud-demo
 * @description: 服务的提供方
 * @author: Mr.Xiao
 * @create: 2020-05-04 15:43
 **/
@EnableDiscoveryClient // 它也是客户端, 它捷能兼容eureka 又能consul、zookeeper等等, 更通用, 更广泛
@SpringBootApplication
@MapperScan("com.xiaoge.user.mapper")
public class UserApplication {

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

}

  2. EurekaServer(子模块: eureka-server)

    package com.xiaoge;

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

/**
 * @program: cloud-demo
 * @description: EurekaServer端
 * @author: Mr.Xiao
 * @create: 2020-05-04 16:34
 **/
@EnableEurekaServer // 启动Eureka服务
@SpringBootApplication
public class EurekaServer {

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

}

  3. ConsumerApplication(子模块: consumer-demo)

    package com.xiaoge;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

/**
 * @program: cloud-demo
 * @description: 服务调用方
 * @author: Mr.Xiao
 * @create: 2020-05-04 16:04
 **/
@EnableDiscoveryClient // 它也是客户端, 它捷能兼容eureka 又能consul、zookeeper等等, 更通用, 更广泛
@SpringBootApplication
public class ConsumerApplication {

    @Bean // 把它加载进spring容器
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

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

}
posted on 2020-05-04 20:43  gmlgxx  阅读(39)  评论(0)    收藏  举报
 
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