SpringCloud学习（4）：Rest学习环境搭建：服务提供者（下）

Dear 丶 2023-01-09 03:41 136阅读 0赞

### 六、编写实体类 ###

package com.buba.springcloud.pojo;
    
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import lombok.experimental.Accessors;
    
    import java.io.Serializable;
    
    /**
     * 部门实体类
     */
    @Data
    @NoArgsConstructor
    @Accessors(chain = true)
    public class Dept implements Serializable {
        private Long depId;
        private String depName;
        // 表示该数据来自哪个数据库 微服务特性，一个服务对应一个数据库 同一个信息可能存在不同的数据库
        private String db_source;
    
        public Dept(String depName) {
            this.depName = depName;
        }
    }

@Data可以为类提供读写功能，从而不用写get、set方法。它还会为类提供 equals()、hashCode()、toString() 方法。

@NoArgsConstructor创建一个无参构造函数。

@Accessors 的中文含义是存取器，@Accessors用于配置getter和setter方法的生成结果，下面介绍三个属性

fluent的中文含义是流畅的，设置为true，则getter和setter方法的方法名都是基础属性名，且setter方法返回当前对象。如下

@Data
    @Accessors(fluent = true)
    public class User {
        private Long id;
        private String name;
        
        // 生成的getter和setter方法如下，方法体略
        public Long id() {}
        public User id(Long id) {}
        public String name() {}
        public User name(String name) {}
    }

chain的中文含义是链式的，设置为true，则setter方法返回当前对象。如下

@Data
    @Accessors(chain = true)
    public class User {
        private Long id;
        private String name;
        
        // 生成的setter方法如下，方法体略
        public User setId(Long id) {}
        public User setName(String name) {}
    }

prefix的中文含义是前缀，用于生成getter和setter方法的字段名会忽视指定前缀（遵守驼峰命名）。如下

@Data
    @Accessors(prefix = "p")
    class User {
    	private Long pId;
    	private String pName;
    	
    	// 生成的getter和setter方法如下，方法体略
    	public Long getId() {}
    	public void setId(Long id) {}
    	public String getName() {}
    	public void setName(String name) {}
    }

这样第一个微服务就完成了。

### 七、提供者模块 ###

（1）创建部门信息提供者模块，项目可能会越来越多可以把端口号加在项目最后。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70][]

（2）配置pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <parent>
            <artifactId>springcloud</artifactId>
            <groupId>com.buba</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>springcloud-provider-dept-8001</artifactId>
    
        <dependencies>
            
            <dependency>
                <groupId>com.buba</groupId>
                <artifactId>springcloud-api</artifactId>
                <version>1.0-SNAPSHOT</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-web</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jetty</artifactId>
            </dependency>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-test</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
            </dependency>
    
        </dependencies>
    
    </project>

（3）配置

创建application.yml文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 1][]

展开空的目录，创建项目需要的配置文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 2][]

编写mybatis-config.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>
        
        <settings>
            <setting name="cacheEnabled" value="true"/>
        </settings>
    </configuration>

编写application.yml文件

server:
      port: 8001
    
    # mybatis配置
    mybatis:
      type-aliases-package: com.buba.springcloud.pojo
      config-location: classpath:mybatis/mybatis-config.xml
      mapper-locations: classpath:mybatis/mapper/*.xml
    
    # spring配置
    spring:
      application:
        name: springcloud-provider-dept
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        url: jdbc:mysql://localhost:3306/DB01?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false
        username: root
        password:

### 八、编写Dao层 ###

创建mapper接口

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 3][]

在该接口下添加3个功能。

package com.buba.springcloud.dao;
    
    import com.buba.springcloud.pojo.Dept;
    import org.apache.ibatis.annotations.Mapper;
    import org.springframework.stereotype.Repository;
    
    import java.util.List;
    
    @Mapper
    @Repository
    public interface DeptMapper {
    
        boolean addDept(Dept dept);
    
        Dept selDeptById(Long deptId);
    
        List<Dept> selDept();
    }

编写相对应的mapper文件

<?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.buba.springcloud.dao.DeptMapper">
    
        <insert id="addDept" parameterType="Dept">
            insert into dept(deptname,db_source) values (#{deptName},database())
        </insert>
    
        <select id="selDeptById" parameterType="Long" resultType="Dept">
            select * from dept where deptid = #{deptId}
        </select>
    
        <select id="selDept" resultType="Dept">
            select * from dept
        </select>
    </mapper>

### 九、编写Service层 ###

编写Service接口

package com.buba.springcloud.service;
    
    import com.buba.springcloud.pojo.Dept;
    
    import java.util.List;
    
    /**
     * 部门Service接口
     */
    public interface DeptService {
    
        boolean addDept(Dept dept);
    
        Dept selDeptById(Long deptId);
    
        List<Dept> selDept();
    }

编写Service实现

package com.buba.springcloud.service;
    
    import com.buba.springcloud.dao.DeptMapper;
    import com.buba.springcloud.pojo.Dept;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    @Service
    public class DeptServiceImpl implements DeptService {
    
        private DeptMapper deptMapper;
    
        @Override
        public boolean addDept(Dept dept) {
            return deptMapper.addDept(dept);
        }
    
        @Override
        public Dept selDeptById(Long deptId) {
            return deptMapper.selDeptById(deptId);
        }
    
        @Override
        public List<Dept> selDept() {
            return deptMapper.selDept();
        }
    
        @Autowired
        public void setDeptMapper(DeptMapper deptMapper) {
            this.deptMapper = deptMapper;
        }
    }

### 十、编写提供服务类和启动类 ###

（1）提供Restful服务

package com.buba.springcloud.controller;
    
    import com.buba.springcloud.pojo.Dept;
    import com.buba.springcloud.service.DeptService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    /**
     * 提供Restful服务
     */
    @RestController
    public class DeptController {
    
        private DeptService deptService;
    
        @PostMapping("/dept/addDept")
        public boolean addDept(Dept dept) {
            return deptService.addDept(dept);
        }
    
        @GetMapping("/dept/get/{deptId}")
        public Dept selDeptById(@PathVariable("deptId") Long deptId) {
            return deptService.selDeptById(deptId);
        }
    
        @GetMapping("/dept/list")
        public List<Dept> selDept() {
            return deptService.selDept();
        }
    
        @Autowired
        public void setDeptService(DeptService deptService) {
            this.deptService = deptService;
        }
    }

（2）启动类

package com.buba.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class DeptProvider_8001 {
        public static void main(String[] args) {
            SpringApplication.run(DeptProvider_8001.class, args);
        }
    }

（3）启动测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 4][]

在浏览器输入地址![20210120204020540.png][]

返回结果

![20210120204044506.png][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70]: /images/20221119/c6a31d56fa2e458f8318b92608dc01b5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20210120191312810.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20210120192412460.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20210120194745241.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20210120204218236.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjk4MzUx,size_16,color_FFFFFF,t_70
[20210120204020540.png]: https://img-blog.csdnimg.cn/20210120204020540.png
[20210120204044506.png]: https://img-blog.csdnimg.cn/20210120204044506.png