一个简单spring-cloud项目

1.创建父工程
2.父工程的pom文件

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.5.RELEASE</version>
</parent><properties><java.version>1.8</java.version><spring-cloud.version>Greenwich.SR1</spring-cloud.version><mapper.starter.version>2.1.5</mapper.starter.version><mysql.version>5.1.46</mysql.version>
</properties><dependencyManagement><dependencies><!-- springCloud --><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><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-config</artifactId></dependency></dependencies>
</dependencyManagement>
<dependencies><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>

3.创建一个子服务提供者 -----userservice服务
4.userservice的pom文件

<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></dependencies>

5.编写配置文件

server:port: 9090
spring:datasource:driver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://127.0.0.1:3306/mallusername: rootpassword: root
mybatis:#自己的pojo实体类包type-aliases-package: com.wo.pojo

Application 启动类(必须在所有包的上一级)

@SpringBootApplication
@MapperScan("com.wo.mapper")
public class UserServiceApplication {public static void main(String[] args) {SpringApplication.run(UserServiceApplication.class, args);}
}

实体类user

public class User{// id@Id//开启主键自动回填@KeySql(useGeneratedKeys = true)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;
}

mapper层的编写

//引用通用mapper  
public interface UserMapper extends Mapper<User> {}

service层的编写

@Service
public class UserService {@Autowiredprivate UserMapper userMapper;public User findById(Long id){return userMapper.selectByPrimaryKey(id);}}

controller层的代码

@RestController
@RequestMapping("/user")
public class UserController {@Autowiredprivate UserService userService;@GetMapping("/{id}")public User findById(@PathVariable Long id){return userService.findById(id);}

访问地址 返回数据.如果出现这个问题
则是在SpringBoot的启动类上，使用@MapperScan注解时引入了错误的包下的。
正确的应该是：import tk.mybatis.spring.annotation.MapperScan;
错误的引入了：import org.mybatis.spring.annotation.MapperScan;
二.创建了服务的生产者 则需要一个消费者去调用
1.创建一个简单的工程 pom文件

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

Application启动类

@SpringBootApplication
public class ConsumerApplication {public static void main(String[] args) {SpringApplication.run(ConsumerApplication.class, args);}@Bean//简单模拟   后面需要Eureka获取地址public RestTemplate restTemplate() {return new RestTemplate();}
}

2.同样需要pojo

@Data
public class User {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;

controller编写

@RestController
@RequestMapping("/consumer")
public class ConsumerController {@Autowiredprivate RestTemplate restTemplate;@RequestMapping("/{id}")public User findById(@PathVariable Long id){String url="http://localhost:9090/user/"+id;User user = restTemplate.getForObject(url, User.class);return user;}
}

访问路径 http://localhost:9091/consumer/8