第一章：SpringCloud服务发现和服务注册

#服务提供者 ####1. 解决硬编码问题

1. 修改一个服务ip后关联到好几个服务的配置修改

####2. 服务发现组件

1. 服务注册表
2. 服务注册
3. 健康检查 默认30s

####3. 服务发现方式

1. 客户端 eureka 【zk】
2. 服务端 consul+nginx

####4. 代码片 ######pom.xml

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

######配置文件application.yml

server:
  port: 7900
spring:
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:
    url: jdbc:mysql://127.0.0.1/springcloud??characterEncoding=UTF8&useSSL=true&allowMultiQueries=true
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver
    schema: classpath:schema.sql   #建表
    data: classpath:data.sql #数据
logging:
  level: info

######创建数据库

1. schema.sql

DROP table user if exists;
CREATE TABLE user(
    id bigint,
    username varchar(40),
    name varchar(20),
    age int(3),
    balance decimal(10,2),
    PRIMARY KEY(id)
);

2. data.sql

insert into user(id,username,name,age,balance) VALUES(1,'user1','老焦1',200,100.00);
insert into user(id,username,name,age,balance) VALUES(2,'user2','老焦2',200,100.00);
insert into user(id,username,name,age,balance) VALUES(3,'user3','老焦3',200,100.00);
insert into user(id,username,name,age,balance) VALUES(4,'user4','老焦4',200,100.00);
insert into user(id,username,name,age,balance) VALUES(5,'user5','老焦5',200,100.00);

######创建Bean和dao User.java

/**
 * Created by Fant.J.
 * 2017/11/11 13:53
 */
@Entity
@Data
public class User implements Serializable{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
    @Column
    private String username;
    @Column
    private String name;
    @Column
    private Short age;
    @Column
    private BigDecimal balance;
}

UserReposiry.java

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

######创建视图层

@RestController
public class UserController {

    @Autowired
    private UserReposiry userReposiry;

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

######启动项目

#服务消费者 ####创建模块 fantj-consumer-movie ######只需要添加User bean和controller

server.port= 7901

/**
 * Created by Fant.J.
 * 2017/11/11 13:53
 */
@Data
public class User implements Serializable{
    private Long id;
    private String username;
    private String name;
    private Short age;
    private BigDecimal balance;
}

@RestController
public class MovieController {
    @Autowired
    private RestTemplate template;

    @RequestMapping("/movie/{id}")
    public User findById(@PathVariable Long id){
        return this.template.getForObject("http://127.0.0.1:7900/simple/"+id,User.class);
    }
}

######启动springboot时候创建RestTemplate类

@SpringBootApplication
public class FantjConsumerMovieApplication {

	@Bean  //实例化resttemplate
	public RestTemplate restTemplate(){
		return new RestTemplate();
	}
	public static void main(String[] args) {
		SpringApplication.run(FantjConsumerMovieApplication.class, args);
	}
}

######启动项目