①Rest微服务案例部门服务提供者。

第一步：新建microservicecloud-provider-dept-8001

看上图，等待进度条完成。

创建完成后请回到父工程查看pom文件变化，以及父工程工程目录变化：

第二步：pom文件。

<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"><modelVersion>4.0.0</modelVersion><parent><groupId>com.lss.springcloud</groupId><artifactId>microservicecloud</artifactId><version>0.0.1-SNAPSHOT</version></parent><artifactId>microservicecloud-provider-dept-8001</artifactId><dependencies><dependency><!-- 引入自己定义的api通用包，可以使用Dept部门Entity --><groupId>com.lss.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><!-- 修改后立即生效，热部署 --><dependency><groupId>org.springframework</groupId><artifactId>springloaded</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId></dependency></dependencies></project>

第三步：yml文件。此时yml文件还没有提示功能。需要安装对应版本的STS插件。后面会讲如何安装。此处省略。

application.yml的内容是：注意：冒号后面都有一个空格，否则无法识别。

server:port: 8001mybatis: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://localhost:3306/cloudDB01              # 数据库名称username: rootpassword: 123456dbcp2: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

第四步：工程src/main/resources目录下新建mybatis文件夹后新建mybatis.cfg.xml文件。

mybatis.cfg.xml的内容是：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration><settings><setting name="cacheEnabled" value="true"/><!-- 二级缓存开启 --></settings></configuration>

第五步：MySQL创建部门数据库脚本。

脚本内容为：

DROP DATABASE IF EXISTS cloudDB01;
CREATE DATABASE cloudDB01 CHARACTER SET UTF8;
USE cloudDB01;
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());SELECT * FROM dept;

打开

执行结果是：

第六步：创建DeptDao部门接口。

DeptDao.java的内容是：

package com.lss.springcloud.dao;import java.util.List;import org.apache.ibatis.annotations.Mapper;import com.lss.springcloud.entities.Dept;@Mapper
public interface DeptDao {public boolean addDept(Dept dept);public Dept findById(Long id);public List<Dept> findAll();}

注意要在接口上加上@Mapper注解！！否则boot无法识别。

第七步:工程src/main/resources/mybatis目录下新建mapper文件夹后再建DeptMapper.xml。

DeptMapper.xml的内容为：

<?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.lss.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>

第八步：创建DeptService部门服务接口。

DeptService.java的内容是：

package com.lss.springcloud.service;import java.util.List;import com.lss.springcloud.entities.Dept;public interface DeptService
{public boolean add(Dept dept);public Dept    get(Long id);public List<Dept> list();
}

第九步：创建DeptServiceImpl部门服务接口实现类。

DeptServiceImpl.java的内容是：

package com.lss.springcloud.service.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.lss.springcloud.dao.DeptDao;
import com.lss.springcloud.entities.Dept;
import com.lss.springcloud.service.DeptService;@Service
public class DeptServiceImpl implements DeptService {@Autowiredprivate DeptDao dao;@Overridepublic boolean add(Dept dept) {return dao.addDept(dept);}@Overridepublic Dept get(Long id) {return dao.findById(id);}@Overridepublic List<Dept> list() {return dao.findAll();}}

第十步：创建DeptController部门微服务提供者REST。

springboot是前后端分离的 ，作为后端java编程工程师，只需要返回json串给前端代码，所以有两种写法：

一种是@Controller+@ResponseBody的写法

另一种写法，只写@RestController。

DeptController.java的内容是：

package com.lss.springcloud.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;import com.lss.springcloud.entities.Dept;
import com.lss.springcloud.service.DeptService;@RestController
public class DeptController {@Autowiredprivate DeptService service;@RequestMapping(value = "/dept/add" , method = RequestMethod.POST)public boolean add(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();}
}

第十一步：创建DeptProvider8001_App主启动类。

此时需要在navigator视图下操作：

DeptProvider8001_App.java的内容是：

package com.lss.springcloud;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class DeptProvider8001_App {public static void main(String[] args) {SpringApplication.run(DeptProvider8001_App.class, args);}}

然后运行：

出现错误：

Could not find parameter map com.lss.springcloud.dao.DeptDao.BaseResultMap

class dept can not found  等等一堆错误。错误原因在：

DeptMapper.xml

原来错误的DeptMapper.xml内容是：

<?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>

Dept类型无法读取。需要改为以下内容：

<?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.lss.springcloud.dao.DeptDao"><resultMap id="BaseResultMap" type="com.lss.springcloud.entities.Dept" ><id column="deptno" property="deptno" jdbcType="BIGINT" /><result column="dname" property="dname" jdbcType="VARCHAR" /><result column="db_source" property="db_source" jdbcType="VARCHAR" /></resultMap><parameterMap type="com.lss.springcloud.entities.Dept" id="BaseResultMap02"><parameter property="dname"/><parameter property="db_source"/></parameterMap><select id="findById" resultMap="BaseResultMap" parameterType="Long">select deptno,dname,db_source from dept where deptno=#{deptno}; </select><select id="findAll" resultMap="BaseResultMap">select deptno,dname,db_source from dept; </select><insert id="addDept" parameterMap="BaseResultMap02">INSERT INTO dept(dname,db_source) VALUES(#{dname},DATABASE());</insert></mapper>

则重新测试，通过。