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（02）SpringCloud实战之Rest微服务构建案例工程模块

　　一、简单介绍：

　　1、版本

　　Cloud 版本：Dalston.SR1

　　Boot 版本：1.5.9.RELEASE

　　2、模块架构

　　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）

　　二、构建步骤

　　1、构建父工程 microservicecloud

　　父工程只有一个pom.xml，Packageing是pom模式，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。

　　pom.xml

<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.atguigu.springcloud</groupId>
  <artifactId>microservicecloud</artifactId>
  <version>0.0.1-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>5.0.4</version>
     </dependency>
     <dependency>
       <groupId>com.alibaba</groupId>
       <artifactId>druid</artifactId>
       <version>1.0.31</version>
     </dependency>
     <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.0</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>

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　　2、构建模块 microservicecloud-api

　　pom.xml

<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><!-- 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 -->
   <groupId>com.atguigu.springcloud</groupId>
   <artifactId>microservicecloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
  </parent>
 
  <artifactId>microservicecloud-api</artifactId><!-- 当前Module我自己叫什么名字 -->
 
  <dependencies><!-- 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 -->
   <dependency>
     <groupId>org.projectlombok</groupId>
     <artifactId>lombok</artifactId>
   </dependency>
  </dependencies>
  
</project>

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　　Dept.java

 
package com.atguigu.springcloud.entities;
 
import java.io.Serializable;
 
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.Accessors;
 
@SuppressWarnings("serial")
@NoArgsConstructor //无参构造函数
@Data //get set 方法
@Accessors(chain=true) //链式访问
public class Dept implements Serializable //必须序列化
{
  private Long  deptno; //主键
  private String  dname; //部门名称
  private String  db_source; //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
  
  public Dept(String dname)
  {
   super();
   this.dname = dname;
  }
}

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　　注意：此时父工程的pom.xml已经添加了模块

<modules>
　　<module>microservicecloud-api</module>
</modules>

　　3、构建模块 microservicecloud-provider-dept-8001

　　pom.xml

<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.atguigu.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.atguigu.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>

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　　application.yml

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

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　　mybatis/mybatis.cfg.xml

<?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>

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　　执行建库、建表语句

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;

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　　DeptDao.java

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

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　　mybatis/mapper/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.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>

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　　DeptService.java

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

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　　DeptServiceImpl.java

package com.atguigu.springcloud.service.impl;
 
import java.util.List;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import com.atguigu.springcloud.dao.DeptDao;
import com.atguigu.springcloud.entities.Dept;
import com.atguigu.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();
  }
}

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　　DeptController.java

package com.atguigu.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.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
 
import com.atguigu.springcloud.entities.Dept;
import com.atguigu.springcloud.service.DeptService;
 
@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();
  }
}

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　　DeptProvider8001_App.java

package com.atguigu.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);
  }
}

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　　该模块引入了microservicecloud-api的依赖，切换到microservicecloud-api 执行：clean install。然后运行DeptProvider8001_App

　　执行：http://localhost:8001/dept/get/1 若浏览器输出：{"deptno":1,"dname":"开发部","db_source":"clouddb01"} 则访问成功。

　　4、构建模块 microservicecloud-consumer-dept-80

　　pom.xml

<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.atguigu.springcloud</groupId>
   <artifactId>microservicecloud</artifactId>
   <version>0.0.1-SNAPSHOT</version>
  </parent>
 
  <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.atguigu.springcloud</groupId>
     <artifactId>microservicecloud-api</artifactId>
     <version>${project.version}</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>

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　　ConfigBean.java

package com.atguigu.springcloud.cfgbeans;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
 
@Configuration
public class ConfigBean
{
    @Bean
    public RestTemplate getRestTemplate()
    {
         return new RestTemplate();
    }
}

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　　DeptController_Consumer.java

package com.atguigu.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.RestController;
import org.springframework.web.client.RestTemplate;
 
import com.atguigu.springcloud.entities.Dept;
 
@RestController
public class DeptController_Consumer
{
    private static final String REST_URL_PREFIX = "http://localhost:8001";
    
    @Autowired
    private RestTemplate restTemplate;
    
    @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/get/{id}")
    public Dept get(@PathVariable("id") Long id)
    {
         return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
    }
    
    @SuppressWarnings("unchecked")
    @RequestMapping(value="/consumer/dept/list")
    public List<Dept> list()
    {
         return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list", List.class);
    }   
}

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　　DeptConsumer80_App.java

package com.atguigu.springcloud;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class DeptConsumer80_App
{
  public static void main(String[] args)
  {
   SpringApplication.run(DeptConsumer80_App.class, args);
  }
}

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　　启动 DeptProvider8001_App 与 DeptConsumer80_App 这两个微服务。测试：

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

　　http://localhost/consumer/dept/list

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

　　RestTemplate 说明：

　　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。

　　官网地址 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。

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原文地址：https://www.cnblogs.com/javasl/p/12450477.html