搭建简单的SpringCloud项目二：服务层和消费层

GitHub：https://github.com/ownzyuan/test-cloud

前篇：搭建简单的SpringCloud项目一：注册中心和公共层

后篇：搭建简单的SpringCloud项目三：问题及解决

服务层（server）

搭建

用于直接操作数据库，对外提供相应接口，同时服务层也可以消费其他服务层提供的接口。

依赖：

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-openfeign-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper-spring-boot-starter</artifactId>
    </dependency>
​
    <dependency>
        <groupId>tk.mybatis</groupId>
        <artifactId>mapper</artifactId>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>com.github.drtrang</groupId>
        <artifactId>druid-spring-boot2-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>com.zy</groupId>
        <artifactId>cloud-common</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>com.zy</groupId>
        <artifactId>cloud-common-base</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

配置文件：

server:
  port: 8082
​
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8081/eureka/
​
spring:
  application:
    name: cloud-server
​
  main:
    allow-bean-definition-overriding: true
​
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/tktest
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

mapper

创建UserMapper

启动类：

@EnableDiscoveryClient（注册进注册中心）、@MapperScan（扫描mapper）

测试类测试：

import com.zy.mapper.UserMapper;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
​
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = CloudServerApplication.class)
public class UserMapperTest {
​
    @Autowired
    private UserMapper userMapper;
​
    private Long id;
​
    @Before
    public void randomNum() {
        int max = 1000000000, min = 100000000;
        id = (long) (Math.random() * max) + min;
    }
​
    @Test
    public void insertTest() {
        UserDTO userDTO = new UserDTO();
        userDTO.setId(id);
        userDTO.setName("inserted")
                .setStatus(1);
        int result = userMapper.insert(userDTO);
        System.out.println(result > 0);
    }
​
    @Test
    public void updateTest() {
        insertTest();
        UserDTO userDTO = new UserDTO();
        userDTO.setId(id);
        userDTO.setName("updated")
                .setStatus(1);
        int result = userMapper.updateByPrimaryKey(userDTO);
        System.out.println(result > 0);
    }
​
    @Test
    public void deleteTest() {
        insertTest();
        UserDTO userDTO = new UserDTO();
        userDTO.setId(id);
        userDTO.setName("deleted")
                .setStatus(0);
        int result = userMapper.updateByPrimaryKey(userDTO);
        System.out.println(result > 0);
    }
​
    @Test
    public void selectTest() {
        insertTest();
        UserDTO userDTO = new UserDTO();
        userDTO.setId(id);
        userDTO.setStatus(1);
        UserDTO result = userMapper.selectOne(userDTO);
        System.out.println(result);
    }
​
}

service

IUserService：

UserService：

import com.zy.entity.UserDTO;
import com.zy.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
​
@Service
public class UserService extends BaseService<UserMapper, UserDTO> implements IUserService {
​
    @Autowired
    private UserMapper userMapper;
​
    public void deleteById(Long id) {
        UserDTO userDTO = new UserDTO();
        userDTO.setId(id);
        userDTO.setStatus(0);
        userMapper.updateByPrimaryKey(userDTO);
    }
}

服务接口

消费层（consumer）

搭建

依赖：

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
​
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
​
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
​
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
​
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-openfeign-core</artifactId>
    </dependency>
​
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
​
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
​
    <dependency>
        <groupId>com.github.drtrang</groupId>
        <artifactId>druid-spring-boot2-starter</artifactId>
    </dependency>
​
    <dependency>
        <groupId>com.zy</groupId>
        <artifactId>cloud-common</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
​
    <dependency>
        <groupId>com.zy</groupId>
        <artifactId>cloud-common-base</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
​
    <dependency>
        <groupId>com.zy</groupId>
        <artifactId>cloud-server</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
​
</dependencies>

配置：

server:
  port: 8083
​
eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8081/eureka/
​
spring:
  application:
    name: consumer
  main:
    allow-bean-definition-overriding: true
​
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/tktest
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

Api（消费接口）

Api接口：

该Api的Hystrix的实现：

这里我没做服务器降级的处理，加入了一条return以便后续验证调用是否成功

Controller

import com.zy.api.DataApi;
import com.zy.entity.UserDTO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
​
@RestController
@RequestMapping("/consumer")
public class ConsumerController {
​
    @Autowired
    private DataApi dataApi;
​
    @PostMapping("/insert")
    public String insertData(@RequestBody UserDTO userDTO){
        return dataApi.insertData(userDTO);
    }
​
}

启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
​
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients("com.zy.api")
public class CloudConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(CloudConsumerApplication.class, args);
    }
}

测试Demo

启动顺序：cloud-eureka-server ---> cloud-server ---> cloud-consumer

查看注册中心（Eureka）：

说明服务和消费者都注册成功了，然后打开postman测试：

调用consumer的controller

打开数据库查看：

成功添加