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: 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://localhost:3306/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
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 configuration
PUBLIC "-//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 {
@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();
}
}
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 {
@Autowired
private 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。