SpringCloud(第 004 篇)用户服务类(添加服务注册,将用户微服务注册到 EurekaServer 中)

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一、大致介绍

通过添加注解 EnableEurekaClient,将用户微服务注册到 EurekaServer 中。

二、实现步骤

2.1 添加 maven 引用包

<?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>
 
    <artifactId>springms-provider-user</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    
    <parent>
        <groupId>com.springms.cloud</groupId>
        <artifactId>springms-spring-cloud</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <dependencies>
        <!-- 访问数据库模块 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

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

        <!-- h2数据库模块 -->
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- 客户端发现模块 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>

        <!-- 监控和管理生产环境的模块 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>

2.2 添加应用配置文件(springms-provider-usersrcmainresourcesapplication.yml)

server:
  port: 7900
spring:
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:
    platform: h2
    schema: classpath:schema.sql
    data: classpath:data.sql
  application:
    name: springms-provider-user  #全部小写
logging:
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.bibernate.type.descriptor.sql.BasicExtractor: TRACE
    com.springms: DEBUG
eureka:
  client:
    service-url:
      # defaultZone: http://localhost:8761/eureka/ #不需要认证
      defaultZone: http://admin:admin@localhost:8761/eureka #需要认证
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}
    # 元数据测试
    metadata-map:
      zone: ABC                 # eureka 可以理解的元数据
      hmily: HMILYYLIMH         # 不会影响客户端行为
#    appname: appname-springms-provider-user    # 直接显示的是App应用的名称,在 http://localhost:8761/ 地址处可以看到该注册服务的应用名称

#    # 这里我们就先注释掉,知道这个 hostname 的用法就可以了,先注释掉不影响后面的测试
#    hostname: user              # 然后我们就可以通过 http://user:7900/simple/1 来访问我们的地址了

2.3 添加 H2 数据库脚本(springms-provider-usersrcmainresourcesschema.sql)

drop table user if exists;

CREATE TABLE USER(
    id BIGINT GENERATED by default as identity,
    username VARCHAR(40),
    name VARCHAR(20),
    age int(3),
    balance DECIMAL(10, 2),
    PRIMARY KEY(id)
);

2.4 插入 H2 数据库一些初始化数据(springms-provider-usersrcmainresourcesdata.sql)

INSERT into user (id, username, name, age, balance) values (1, 'user1', '张三', 20, 100.00);
INSERT into user (id, username, name, age, balance) values (2, 'user2', '李四', 22, 100.00);
INSERT into user (id, username, name, age, balance) values (3, 'user3', '王五', 24, 100.00);
INSERT into user (id, username, name, age, balance) values (4, 'user4', '赵六', 26, 100.00);
INSERT into user (id, username, name, age, balance) values (5, 'user5', '李逵', 27, 100.00);
INSERT into user (id, username, name, age, balance) values (6, 'user6', '张远', 10, 100.00);
INSERT into user (id, username, name, age, balance) values (7, 'user7', '迪拜', 60, 100.00);
INSERT into user (id, username, name, age, balance) values (8, 'user8', '哈士奇', 40, 100.00);
INSERT into user (id, username, name, age, balance) values (9, 'user9', '关羽', 30, 100.00);

2.5 添加访问底层数据模型的DAO接口(springms-provider-usersrcmainjavacomspringmscloudrepositoryUserRepository.java)

package com.springms.cloud.repository;

import com.springms.cloud.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {

}

2.6 添加实体用户类User(springms-provider-usersrcmainjavacomspringmscloudentityUser.java)

package com.springms.cloud.entity;

import java.math.BigDecimal;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  @Column
  private String username;

  @Column
  private String name;

  @Column
  private Short age;

  @Column
  private BigDecimal balance;

  public Long getId() {
    return this.id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return this.username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Short getAge() {
    return this.age;
  }

  public void setAge(Short age) {
    this.age = age;
  }

  public BigDecimal getBalance() {
    return this.balance;
  }

  public void setBalance(BigDecimal balance) {
    this.balance = balance;
  }
}

2.7 添加用户Web访问层Controller(springms-provider-usersrcmainjavacomspringmscloudcontrollerUserController.java)

package com.springms.cloud.controller;

import com.google.common.collect.Lists;
import com.springms.cloud.entity.User;
import com.springms.cloud.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;

/**
 * 用户界面控制层。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/9/17
 *
 */
@RestController
public class UserController {

    @Autowired
    private UserRepository userRepository;

//    @Autowired
//    private EurekaClient discoveryClient;

    @GetMapping("/simple/{id}")
    public User findById(@PathVariable Long id){
        return userRepository.findOne(id);
    }

//    public String serviceUrl(){
//        InstanceInfo instance = this.discoveryClient.getNextServerFromEureka("SPRINGMS-PROVIDER-USER", false);
//        return instance.getHomePageUrl();
//    }

    @PostMapping("/user")
    public User postUser(@RequestBody User user){
        System.out.println("@GetMapping(\"user\") 接收参数对象 user: " + user);
        return user;
    }

    @GetMapping("listAll")
    public List<User> listAll(){
        ArrayList<User> list = Lists.newArrayList();
        User user1 = new User(1L, "user1");
        User user2 = new User(1L, "user2");
        User user3 = new User(1L, "user3");
        User user4 = new User(1L, "user4");
        User user5 = new User(1L, "user5");
        list.add(user1);
        list.add(user2);
        list.add(user3);
        list.add(user4);
        list.add(user5);
        return list;
    }
}

2.8 添加用户微服务启动类(springms-provider-usersrcmainjavacomspringmscloudMsProviderUserApplication.java)

package com.springms.cloud;

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

/**
 * 用户服务类(添加服务注册,将用户微服务注册到 EurekaServer 中)。
 *
 * @author hmilyylimh
 *
 * @version 0.0.1
 *
 * @date 2017/9/17
 *
 */
@SpringBootApplication
@EnableEurekaClient
public class MsProviderUserApplication {

    public static void main(String[] args) {
        SpringApplication.run(MsProviderUserApplication.class);
        System.out.println("【【【【【【 用户微服务 】】】】】】已启动.");
    }
}

三、测试

/****************************************************************************************
 一、用户微服务接口测试:

 1、注解:EnableEurekaClient
 2、启动 springms-discovery-eureka 模块服务,启动1个端口;
 3、启动 springms-provider-user 模块服务,启动1个端口;
 4、在浏览器输入地址http://localhost:7900/simple/1 可以看到信息成功的被打印出来,说明用户微服务正常;

 5、在浏览器输入地址 http://localhost:8761 并输入用户名密码 admin/admin 进入Eureka微服务显示在网页中,说明用户微服务确实注册到了 eureka 服务中;
 6、在浏览器输入地址 http://localhost:8761/eureka/apps/springms-provider-user 可以看到自定义的 <metadata>信息以及用户微服务的相关信息成功的被展示出来了;
 ****************************************************************************************/
 
/****************************************************************************************
 二、用户微服务接口测试(给 springms-discovery-eureka-ha 模块做测试,测试EurekaClient客户端注册进EurekaServer高可用集群中):

 1、注解:EnableEurekaClient
 2、修改 defaultZone 的接入地址值如下:
 ###################################################################################
 # 测试二:测试EurekaClient客户端注册进EurekaServer高可用集群中
 defaultZone: http://admin:admin@peer1:8401/eureka,,http://admin:admin@peer2:8402/eureka,,http://admin:admin@peer3:8403/eureka
 ###################################################################################
 3、启动 springms-discovery-eureka-ha 模块服务,启动3个端口;
 4、启动 springms-provider-user 模块服务,启动1个端口;
 5、在浏览器输入地址http://localhost:7900/simple/1 可以看到信息成功的被打印出来,说明用户微服务正常;

 6、在浏览器输入地址 http://localhost:8401 并输入用户名密码 admin/admin 进入Eureka微服务显示在网页中,说明用户微服务确实注册到了 eureka 服务中;
 7、在浏览器输入地址 http://localhost:8401/eureka/apps/springms-provider-user 可以看到自定义的 <metadata>信息以及用户微服务的相关信息成功的被展示出来了;
 8、在浏览器输入地址 http://localhost:8402/eureka/apps/springms-provider-user 可以看到自定义的 <metadata>信息以及用户微服务的相关信息成功的被展示出来了;
 9、在浏览器输入地址 http://localhost:8403/eureka/apps/springms-provider-user 可以看到自定义的 <metadata>信息以及用户微服务的相关信息成功的被展示出来了;
 ****************************************************************************************/ 

四、下载地址

https://gitee.com/ylimhhmily/SpringCloudTutorial.git

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