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一、准备工作

承接着之前的SpringMVC+Mybatis+MySQL初级高级课程,以Dept部门模块做一个微服务通用案例Consumer消费者(Client)通过REST调用Provider提供者(Server)提供的服务

需要掌握的知识:

  • Spring
  • SpringMVC
  • MyBatis
  • MySQL

项目构建:Maven

Maven的分包分模块架构复习

一个简单的Maven模块结构是这样的:
---- app-parent  一个父项目(app-parent)聚合很多子项目(app-util,app-dao,app-service,app-web)
      |---- pom.xml (pom)
      |
      |-------- app-util
      | |-------- pom.xml (jar)
      |
      |-------- app-dao
      | |-------- pom.xml (jar)
      |
      |-------- app-service
      | |-------- pom.xml (jar)
      |
      |-------- app-web
        |-------- pom.xml (war) 

一个Project带着多个Module子模块

MicroServiceCloud父工程(Project)下初次带着3个子模块(Module)

  • microservicecloud-api:封装的整体entity/接口/公共配置等
  • microservicecloud-provider-dept-8001:微服务落地的服务提供者
  • microservicecloud-consumer-dept-80:微服务调用的客户端使用

Tips: 80端口是为HTTP(HyperText Transport Protocol)即超文本传输协议开放的 此为上网冲浪使用次数最多的协议,主要用于WWW(World Wide Web)即万维网传输信息的协议。

可以通过HTTP地址(即常说的"网址")加":80"来访问网站,

因为浏览网页服务默认的端口号都是80,因此只需输入网址即可,不用输入":80"了。

SpringCloud版本:

<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>
<dependencies>

二、父工程构建

1、创建Maven Project父工程

(1)新建父工程microservicecloud,切记是Packageing是pom模式

(2)主要是定义POM文件,将后续各个子模块公用的jar包等统一提出来,类似一个抽象父类

(3)pom 文件

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.njf.springcloud</groupId>
    <artifactId>microservicecloud</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <junit.version>4.12</junit.version>
        <log4j.version>1.2.17</log4j.version>
        <lombok.version>1.16.18</lombok.version>
    </properties>

    <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>5.1.44</version>
            </dependency>
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.12</version>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.2</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>${junit.version}</version>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>${log4j.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

三、API 公共模块

1、新建microservicecloud-api

eclipse:

IDEA:

2、修改 pom 文件

<?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">

    <!-- 子类里面显示声明才能有明确的继承表现,无意外就是父类的默认版本否则自己定义 -->
    <parent>
        <artifactId>microservicecloud</artifactId>
        <groupId>com.njf.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <!-- 当前Module我自己叫什么名字 -->
    <artifactId>microservicecloud-api</artifactId>


    <!-- 当前Module需要用到的jar包,按自己需求添加,如果父类已经包含了,可以不用写版本号 -->
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

</project>


3、新建部门Entity且配合lombok使用

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;

import java.io.Serializable;


@SuppressWarnings("serial")
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain = true)
public class Dept implements Serializable {
    //主键
    private Long deptno;
    //部门名称
    private String dname;
    //来自那个数据库,因为微服务架构可以一个服务对应一个数据库,同一个信息被存储到不同数据库
    private String db_source;

    public Dept(String dname) {
        this.dname = dname;
    }
}

TIp:IDEA中需要安装 Lombok 插件。

mvn clean install后给其它模块引用,达到通用目的。 也即需要用到部门实体的话,不用每个工程都定义一份,直接引用本模块即可。

四、服务提供者

1、新建microservicecloud-provider-dept-8001 的Maven 模块

2、POM 文件

<?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>microservicecloud</artifactId>
        <groupId>com.njf.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <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.njf.springcloud</groupId>
            <artifactId>microservicecloud-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-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>

3、Yml 配置文件

server:
  port: 8001

mybatis:
  config-location: classpath:mybatis/mybatis.cfg.xml        # mybatis配置文件所在路径
  type-aliases-package: com.njf.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                            #服务名(重要!!!)
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: com.mysql.jdbc.Driver                # mysql驱动包
    url: jdbc:mysql://localhost:3306/cloudDB01?useSSL=false              # 数据库名称
    username: root
    password: root
    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

4、MyBatis配置文件

工程src/main/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>

    <settings>
        <setting name="cacheEnabled" value="true"/><!-- 二级缓存开启 -->
    </settings>

</configuration>

5、MySQL创建部门数据库脚本

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;

6、DeptDao部门接口

@Mapper
public interface DeptDao {
    public boolean addDept(Dept dept);

    public Dept findById(Long id);

    public List<Dept> findAll();
}

7、创建Mapper文件

工程src/main/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.njf.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>

8、DeptService部门服务接口

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

9、DeptServiceImpl部门服务接口实现类

@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<Deptlist()
    {
        return dao.findAll();
    }

}

10、DeptController部门微服务提供者REST

@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();
    }

}

11、DeptProvider8001_App主启动类

@SpringBootApplication
public class DeptProvider8001_App {
    public static void main(String[] args) {
        SpringApplication.run(DeptProvider8001_App.class, args);
    }
}

12、通过浏览器测试

13、工程目录

五、服务消费者

1、新建microservicecloud-consumer-dept-80 Maven Model

2、POM 文件

<?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>microservicecloud</artifactId>
        <groupId>com.njf.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microservicecloud-consumer-dept-80</artifactId>
    <description>部门微服务消费者</description>

    <dependencies>
        <dependency><!-- 自己定义的api -->
            <groupId>com.njf.springcloud</groupId>
            <artifactId>microservicecloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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>

3、YML 配置文件

server:
  port: 80

4、编写配置类

com.njf.springcloud.cfgbeans包下ConfigBean的编写(类似spring里面的applicationContext.xml写入的注入Bean)

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

}

5、创建消费者

com.njf.springcloud.controller包下新建DeptController_Consumer部门微服务消费者REST

6、RestTemplate

(1)RestTemplate 是什么

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

(2)官网及使用

https://docs.spring.io/spring-framework/docs/4.3.7.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html

使用restTemplate访问restful接口非常的简单粗暴无脑。 (url, requestMap, ResponseBean.class)这三个参数分别代表 REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。

7、使用 RESTTemplate 进行服务调用

@RestController
public class DeptController_Consumer {

    @Autowired
    private RestTemplate restTemplate;

    private static final String REST_URL_PREFIX = "http://localhost:8001";

    /**
     * 这三个参数分别代表
     * REST请求地址、请求参数、HTTP响应转换被转换成的对象类型
     * @param dept
     * @return
     */
    @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/list")
    public List<Dept> getDept() {
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/list", List.class);
    }

    @RequestMapping(value = "/consumer/dept/get/{id}")
    public Dept getDeptById(@PathVariable("id") Long id){
        return restTemplate.getForObject(REST_URL_PREFIX + "/dept/get/" + id, Dept.class);
    }

}

8、DeptConsumer80_App主启动类

@SpringBootApplication
public class DeptConsumer80_App {
    public static void main(String[] args) {
        SpringApplication.run(DeptConsumer80_App.class, args);
    }
}

9、测试:

通过消费端进行测试:

http://localhost/consumer/dept/get/2

http://localhost/consumer/dept/list

http://localhost/consumer/dept/add?dname=AI

10、目录结构

 

posted on   格物致知_Tony  阅读(58)  评论(0编辑  收藏  举报
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