SpringCloud入门 - 业务模块搭建（二）

Dear 丶 2022-03-15 09:40 205阅读 0赞

# SpringCloud入门 - 业务模块搭建 #

## 1. 需求 ##

搭建业务模块，实现Emp员工信息操作

## 2. 工程结构示意 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70]  
模块总览  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 1]

## 3. 父工程 ##

### 3.1 创建maven项目 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 2]

### 3.2 pom配置 ###

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.8.RELEASE</version>
        <relativePath />
    </parent>
    
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    
    <dependencyManagement>
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    
    
    <dependencies>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
    	
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>springloaded</artifactId>
            <version>1.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

## 4. 公共模块构建 ##

### 4.1 New Maven Project ###

创建maven项目emall-api，该项目无需继承刚刚创建的父项目

### 4.2 pom配置 ###

<dependencies>
    	
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

### 4.3 创建员工Entity ###

@SuppressWarnings("serial")
    @NoArgsConstructor
    @Data
    @Accessors(chain=true)//开启链式风格
    public class Emp implements Serializable{ 
    	private Integer empNo;
    	private String name;
    	private String sex;
    	private Integer age;
    	private Double sal;
    	private String dbSource;
    }

## 5. 员工模块服务提供者构建 ##

### 5.1 New Maven Module ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 4]

创建后观察下父工程的pom内容。

### 5.2 pom配置 ###

<dependencies>
        
        <dependency>
            <groupId>com.kgc</groupId>
            <artifactId>emall-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    
        
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    
        
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.0</version>
        </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>
            
            <exclusions>  
                <exclusion>  
                    <groupId>org.springframework.boot</groupId>  
                    <artifactId>spring-boot-starter-tomcat</artifactId>  
                </exclusion>  
            </exclusions>  
        </dependency>
    </dependencies>

（可以把依赖的版本号放到父项目中的dependencyManagement统一管理）

### 5.3 application.yml配置 ###

在resource目录下新建application.yml并编辑yml内容

server:
      port: 8001 #服务端口
      
    spring:
      application:
        name: emall-emp-provider        #服务名
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource  #数据源操作类型
        driver-class-name: com.mysql.jdbc.Driver      #mysql驱动类
        url: jdbc:mysql://localhost:3306/empdb01      #数据库名称
        username: root                                #数据库连接用户
        password: 123456 #数据库连接密码
        dbcp2:
          initial-size: 5 #连接池初始化连接数
          min-idle: 5 #连接池最少连接数
          max-idle: 5 #连接池最大连接数
          max-wait-millis: 300 #连接最大等待超时时间
        
      
    # mybatis整合
    mybatis:
      config-location: classpath:mybatis/mybatis.cfg.xml    #mybatis配置文件的位置
      type-aliases-package: com.emall.entities              #为Entity包配置别名
      mapper-locations:
      - classpath:mybatis/mapper/**/*.xml                   #mapper映射文件的位置

### 5.4 mybatis.cfg.xml配置 ###

1.  新建mybatis.cfg.xml，注意路径和文件名和上面yml中定义保持一致
2.  编辑内容，主要是配置二级缓存（如果不开启二级缓存，这个文件可以省略）

<?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>
    	<settings>
    		
    		<setting name="cacheEnabled" value="true" />
    	</settings>
    </configuration>

### 5.5 建库建表 ###

DROP DATABASE IF EXISTS empdb01;
    CREATE DATABASE empdb01 CHARACTER SET UTF8;
    USE empdb01;
    
    CREATE TABLE emp
    (
    	emp_no BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    	NAME VARCHAR(60),
    	sex VARCHAR(2),
    	age INT(3),
    	sal DECIMAL(17),
    	db_source VARCHAR(60)
    );
    
    INSERT INTO emp(NAME,sex,age,sal,db_source) VALUES('张三疯','M',99,9999,DATABASE());
    INSERT INTO emp(NAME,sex,age,sal,db_source) VALUES('李四疯','F',18,2800,DATABASE());
    INSERT INTO emp(NAME,sex,age,sal,db_source) VALUES('王五疯','M',23,3500,DATABASE());
    INSERT INTO emp(NAME,sex,age,sal,db_source) VALUES('赵六疯','M',30,6500,DATABASE());

### 5.6 DAO编码 ###

1.  新建DAO

@Mapper
    public interface EmpDao { 
       public List<Emp> getAll();
       public boolean addEmp(Emp emp);
       public Emp getEmpById(Integer id);
       public boolean delEmp(Integer id);
    }

1.  新建EmpMapper.xml，文件路径需和yml的配置保持一致

<?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.emall.dao.EmpDao"> 
    	<select id="getAll" resultType="Emp">
    		SELECT 
    			emp_no empNo,
    			NAME,
    			sex,
    			age,
    			sal,
    			db_source dbSource
    		FROM emp
    	</select>
    	
    	<insert id="addEmp" parameterType="Emp">
    		INSERT INTO emp(name,sex,age,sal,db_source) 
    		VALUES(#{name},#{sex},#{age},#{dbSource},DATABASE());
    	</insert>
    	
    	<select id="getEmpById" resultType="Emp" parameterType="Integer">
    		SELECT 
    			emp_no empNo,
    			NAME,
    			sex,
    			age,
    			sal,
    			db_source dbSource
    		FROM emp
    		WHERE emp_no = #{empNo}
    	</select>
    	
    	<delete id="delEmp" parameterType="Integer">
    		DELETE FROM emp
    		WHERE emp_no = #{empNo}
    	</delete>
    </mapper>

### 5.7 Service编码 ###

public interface EmpService { 
    	public List<Emp> getAll();
    	public boolean addEmp(Emp emp);
    	public Emp getEmpById(Integer id);
    	public boolean delEmp(Integer id);
    }

@Service
    public class EmpServiceImpl implements EmpService{ 
    	
    	@Autowired
    	private EmpDao dao;
    
    	@Override
    	public List<Emp> getAll() { 
    		return dao.getAll();
    	}
    
    	@Override
    	public boolean addEmp(Emp emp) { 
    		return dao.addEmp(emp);
    	}
    
    	@Override
    	public Emp getEmpById(Integer id) { 
    		return dao.getEmpById(id);
    	}
    
    	@Override
    	public boolean delEmp(Integer id) { 
    		return dao.delEmp(id);
    	}
    }

### 5.8 Controller编码 ###

@RestController
    public class EmpController { 
    
    	@Autowired
    	private EmpService service;
    	
    	@PostMapping("/emp/add")
    	public boolean add(@RequestBody Emp emp){ 
    		return service.addEmp(emp);
    	}
    	
    	@GetMapping("/emp/get/{id}")
    	public Emp get(@PathVariable Integer id){ 
    		return service.getEmpById(id);
    	}
    	
    	@GetMapping("/emp/get/list")
    	public List<Emp> list(){ 
    		return service.getAll();
    	}
    	
    	@DeleteMapping("/emp/delete/{id}")
    	public boolean delete(@PathVariable Integer id){ 
    		return service.delEmp(id);
    	}
    }

### 5.9 启动类 ###

注意：该类必须放在所有类的上级包中

@SpringBootApplication
    public class EmpProviderApplication_8001 { 
    	public static void main(String[] args) { 
    		SpringApplication.run(EmpProviderApplication_8001.class, args);
    	}
    }

运行启动类程序并测试。

## 6. 员工模块服务消费者构建 ##

### 6.1 New Maven Module ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 6]

### 6.2 pom配置 ###

<dependencies>
        
        <dependency>
            <groupId>com.kgc</groupId>
            <artifactId>emall-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            
            <exclusions>  
                <exclusion>  
                    <groupId>org.springframework.boot</groupId>  
                    <artifactId>spring-boot-starter-tomcat</artifactId>  
                </exclusion>  
            </exclusions>  
        </dependency>
    </dependencies>

### 6.3 application.yml配置 ###

server:
      port: 80

80端口如果被System进程占用，可以修改注册表解决，参考下图  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NjEzNTAz_size_16_color_FFFFFF_t_70 7]

### 6.4 配置RestTemplate ###

暂时的目的是配置一个RestTemplate Bean，利用该对象远程调用服务提供者

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

### 6.5 Controller编码 ###

@RestController
    public class EmpController { 
    
    	@Autowired
    	//RestTemplate是一种简单的访问restful服务模板类
    	private RestTemplate rt;
    	
    	private static final String URL_PREFIX = "http://localhost:8001";//远程服务
    	
    	@RequestMapping(value="/consumer/emp/add")
    	public boolean add(Emp emp){ 
    		return rt.postForObject(URL_PREFIX + "/emp/add", emp, Boolean.class);
    	}
    	@RequestMapping(value="/consumer/emp/get/{id}")
    	public Emp get(@PathVariable("id") Integer id){ 
    		return rt.getForObject(URL_PREFIX + "/emp/get/" + id, Emp.class);
    	}
    	@SuppressWarnings("unchecked")
    	@RequestMapping(value="/consumer/emp/get/list")
    	public List<Emp> list(){ 
    		return rt.getForObject(URL_PREFIX + "/emp/get/list" , List.class); 
    	}
    	@RequestMapping(value="/consumer/emp/delete/{id}")
    	public void delete(@PathVariable("id") Integer id){ 
    		rt.delete(URL_PREFIX + "/emp/delete/" + id, Boolean.class);
    	}
    }

### 6.6 启动类 ###

@SpringBootApplication
    public class EmpConsumerApplication_80 {
    	public static void main(String[] args) {
    		SpringApplication.run(EmpConsumerApplication_80.class, args);
    	}
    }

### 6.7 测试 ###

分别启动员工服务提供者和员工服务消费者两个服务，然后在浏览器中发请求，  
测试成功则基础模块搭建成功！！！

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