0.学习视频参考网址：https://www.cnblogs.com/520playboy/p/8074347.html

1、创建服务的提供者

• 1.1 创建schema.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)
);

• 1.2 创建data.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', 20, 100.00);
insert into user(id,username, name, age, balance) values(3,'user3', '王五', 20, 100.00);
insert into user(id,username, name, age, balance) values(4,'user4', '马六', 20, 100.00);

• 1.3 创建application.yml

server:
  port: 7911
spring:
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:
    platform: h2
    schema: classpath:schema.sql
    data: classpath:data.sql
logging:
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
    com.itmuch: DEBUG

• 1.4 创建实体Bean

@Entity
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler","fieldHandler"}) 
public class User implements Serializable {
    private static final long serialVersionUID = -7932774844779669840L;
    @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;
    }
}

• 1.5 创建DAO层的数据源操作接口(JpaRepository有内置方法，暂不需要SERVICE层操作方法)

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

• 1.6 创建CONTROLLER层的操作接口

@RestController
public class UserController {
    @Autowired
    private UserRepository userRepository;
    
    @GetMapping("/simple/{id}")
    public User findByID(@PathVariable Long id) {
        return userRepository.getOne(id);
    }
}

• 1.7 创建入口方法

@SpringBootApplication
public class ServerProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServerProviderApplication.class, args);
    }
    
    @Bean  
    public ServletRegistrationBean dispatcherRegistration(DispatcherServlet dispatcherServlet) {  
        ServletRegistrationBean registration = new ServletRegistrationBean(dispatcherServlet);  
        registration.getUrlMappings().clear();  
        //registration.addUrlMappings("*.do");  
        //registration.addUrlMappings("*.json");  
        return registration;  
    }  
}

2、创建服务的消费者

• 2.1 创建application.yml

server:
  port: 7901
user: 
  userServicePath: http://localhost:7900/simple/

• 2.2 创建CONTROLLER直接消费

@RestController
public class ConsumeController {
    @Autowired
    private RestTemplate restTemplate;
    
    @Value("${user.userServicePath}")
    private String userServicePath;
      
      
    @GetMapping("/movie/{id}")
    public User findById(@PathVariable Long id) {
      return this.restTemplate.getForObject(this.userServicePath + id, User.class);
    }
}

• 2.3 创建程序入口

@SpringBootApplication
public class ServerConsumeApplication {
    @Bean
    public RestTemplate restTemplate() {
      return new RestTemplate();
    }
      
    public static void main(String[] args) {
        SpringApplication.run(ServerConsumeApplication.class, args);
    }
}

3、创建Eureka

• 3.1 创建application.yml

spring.application.name=eureka-server
server.port=7070
#eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.serviceUrl.defaultZone=http://localhost:${server.port}/eureka/

• 3.2 创建外部接口的主程序

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {
    public static void main(String[] args) {
      SpringApplication.run(EurekaApplication.class, args);
    }
}

• 3.3 运行主程序

3、将服务注册到Eureka

4、Eureka和Ribbon关系和使用