SpringCloud系列二：基本使用

灰太狼 2022-02-04 22:39 374阅读 0赞

一、创建父工程microservicecloud。用来做依赖管理。  
 引入依赖，切记是packaging是pom模式。

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.9.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.46</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.31</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.0</version>
            </dependency>
            <dependency>
                <groupId>ch.qos.logback</groupId>
                <artifactId>logback-core</artifactId>
                <version>1.2.3</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.17</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

二、在父工程microservicecloud右键新建Moudle模块microservicecloud-api。用来作为公共模块。  
1、引入依赖

<dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
    </dependencies>

2、创建实体类

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    @Accessors(chain = true)//开启链式调用
    public class Dept implements Serializable {
    
        private Long deptno;
        private String dname;
        private String db_source;
    
    }

三、创建部门提供者microservicecloud-provider-dept-8001  
1、引入依赖

<dependencies>
       <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

2、yml配置

server:
      port: 8001
    
    mybatis:
      config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
      type-aliases-package: com.atguigu.springcloud.entities    # 所有Entity别名类所在包
      mapper-locations:
      - classpath:mybatis/mapper/**/*.xml                       # mapper映射文件
    
    spring:
       application:
        name: microservicecloud-dept
       datasource:
        type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
        driver-class-name: org.gjt.mm.mysql.Driver              # mysql驱动包
        url: jdbc:mysql://192.168.106.130:3305/clouddb01              # 数据库名称
        username: root
        password: 123456
        dbcp2:
          min-idle: 5                                           # 数据库连接池的最小维持连接数
          initial-size: 5                                       # 初始化连接数
          max-total: 5                                          # 最大连接数
          max-wait-millis: 200                                  # 等待连接获取的最大超时时间

3、在resources目录下新建mybatis文件夹后新建mybatis.cfg.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE configuration
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
    
    </configuration>

4、新建数据库clouddb01。并创建表dept及数据。

CREATE TABLE dept
    (
      deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
      dname VARCHAR(60),
      db_source   VARCHAR(60)
    );
     
    INSERT INTO dept(dname,db_source) VALUES('开发部',DATABASE());
    INSERT INTO dept(dname,db_source) VALUES('人事部',DATABASE());
    INSERT INTO dept(dname,db_source) VALUES('财务部',DATABASE());
    INSERT INTO dept(dname,db_source) VALUES('市场部',DATABASE());
    INSERT INTO dept(dname,db_source) VALUES('运维部',DATABASE());

5、创建接口DeptDao

@Mapper
    public interface DeptDao {
    
        public boolean addDept(Dept dept);
    
        public Dept findById(Long id);
    
        public List<Dept> findAll();
    }

6、在resources/mybatis目录下新建mapper文件夹后再建DeptMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    <mapper namespace="com.atguigu.springcloud.dao.DeptDao">
    
        <select id="findById" resultType="Dept" parameterType="Long">
            select deptno,dname,db_source from dept where deptno=#{deptno};
        </select>
        <select id="findAll" resultType="Dept">
            select deptno,dname,db_source from dept;
        </select>
        <insert id="addDept" parameterType="Dept">
            INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());
        </insert>
    
    </mapper>

7、创建接口

public interface DeptService {
    
        public boolean add(Dept dept);
    
        public Dept get(Long id);
    
        public List<Dept> list();
    }

8、创建接口实现类

@Service
    public class DeptServiceImpl implements DeptService {
    
        @Autowired
        private DeptDao dao;
    
        @Override
        public boolean add(Dept dept) {
            return dao.addDept(dept);
        }
    
        @Override
        public Dept get(Long id) {
            return dao.findById(id);
        }
    
        @Override
        public List<Dept> list() {
            return dao.findAll();
        }
    
    }

9、创建类

@RestController
    public class DeptController {
        @Autowired
        private DeptService service;
    
        @RequestMapping(value = "/dept/add", method = RequestMethod.POST)
        public boolean add(@RequestBody Dept dept) {
            return service.add(dept);
        }
    
        @RequestMapping(value = "/dept/get/{id}", method = RequestMethod.GET)
        public Dept get(@PathVariable("id") Long id) {
            return service.get(id);
        }
    
        @RequestMapping(value = "/dept/list", method = RequestMethod.GET)
        public List<Dept> list() {
            return service.list();
        }
    }

10、启动SpringBoot项目。[http://localhost:8001/dept/list][http_localhost_8001_dept_list]  
![在这里插入图片描述][20190503180653939.png]  
四、创建部门消费者microservicecloud-consumer-dept-9001  
1、引入依赖

<dependencies>
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

2、yml配置

server:
      port: 9001

3、在com.atguigu.springcloud.cfgbeans包下编写ConfigBean配置类（类似spring的applicationContext.xml）

@Configuration
    public class ConfigBean {
    
        @Bean
        public RestTemplate getRestTemplate() {
            return new RestTemplate();
        }
    }

RestTemplate提供了多种便捷访问远程Http服务的方法， 是一种简单便捷的访问restful服务模板类，是Spring提供的用于访问Rest服务的客户端模板工具集。  
4、在com.atguigu.springcloud.controller包下新建DeptController\_Consumer部门微服务消费者REST

@RestController
    public class DeptController_Consumer {
    
        //http://localhost:8001是部门提供者的地址
        private static final String REST_URL_PREFIX = "http://localhost:8001";
    
        //使用restTemplate访问restful接口。(url,requestMap,ResponseBean.class)这三个参数分别代表REST请求地址、请求参数、HTTP响应的对象类型。
        @Autowired
        private RestTemplate restTemplate;
    
    
        @RequestMapping(value = "/consumer/dept/add")
        public boolean add(Dept dept) {
            return restTemplate.postForObject(REST_URL_PREFIX + "/dept/add", dept, Boolean.class);
        }
    
        @RequestMapping(value = "/consumer/dept/get/{id}")
        public Dept get(@PathVariable("id") Long id) {
            return restTemplate.getForObject(REST_URL_PREFIX + "/dept/get/" + id, Dept.class);
        }
    
        @SuppressWarnings("unchecked")
        @RequestMapping(value = "/consumer/dept/list")
        public List<Dept> list() {
            return restTemplate.getForObject(REST_URL_PREFIX + "/dept/list", List.class);
        }
    }

5、启动SpringBoot项目。[http://localhost:9001/consumer/dept/list][http_localhost_9001_consumer_dept_list]  
![在这里插入图片描述][20190503180633505.png]

[http_localhost_8001_dept_list]: http://localhost:8001/dept/list
[20190503180653939.png]: /images/20220205/cdd371de1a00469da67c02aa08661baf.png
[http_localhost_9001_consumer_dept_list]: http://localhost:9001/consumer/dept/list
[20190503180633505.png]: /images/20220205/84c7195593ad4eacb621f3e97e6cad6e.png