微服务架构与SpringCloud

zust_Isabella
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一、新建project工作空间

1、dependencyManagement

dependencyManagement:子模块继承之后，提供作用：锁定版本+子module，不用写groupID和version。

好处：聚合管理，想修改版本号时，只需在顶层的父容器中更新。

dependencyManagement只是声明依赖，并不实现引入，因此子项目需要显示的声明需要用的依赖。

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-dependencies</artifactId>
  <version>2.2.2.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>
<!--spring cloud Hoxton.SR1-->
<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-dependencies</artifactId>
  <version>Hoxton.SR1</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>
<!--spring cloud alibaba 2.1.0.RELEASE-->
<dependency>
  <groupId>com.alibaba.cloud</groupId>
  <artifactId>spring-cloud-alibaba-dependencies</artifactId>
  <version>2.2.0.RELEASE</version>
  <type>pom</type>
  <scope>import</scope>
</dependency>

2、maven中跳过单元测试

image.png

3、父工程创建完成执行mvn:install将父工程发布到仓库方便子工程继承

4、不同端口同时启动需要打开services

image.png

二、微服务提供者支付Module模块

1、建modul

2、改pom

<?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>cloud2020</artifactId>
        <groupId>com.atguigu.springboot</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-provider-payment8001</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

3、写yml

server:
  port: 8001

spring:
  application:
    name: cloud-payment-service
  zipkin:
    base-url: http://localhost:9411
  sleuth:
    sampler:
    #采样率值介于 0 到 1 之间，1 则表示全部采集
    probability: 1
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource            # 当前数据源操作类型
    driver-class-name: com.mysql.cj.jdbc.Driver            # mysql驱动包
    url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: 123456

mybatis:
  mapperLocations: classpath:mapper/*.xml
  type-aliases-package: com.atguigu.springcloud.entities    # 所有Entity别名类所在包

4、主启动

package com.atguigu.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class PaymentMain8001 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8001.class,args);
    }
}

5、业务类

controller调service,service调dao

(1)建表SQL

CREATE TABLE `payment` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `serial` varchar(200) COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

(2)entities

①主实体Payment

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
    private Long id;
    private String serial;
}

②Json封装体CommonResult

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult <T>{
    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code,String message){
        this(code,message,null);
    }

}

(3)dao

①接口PaymentDao

@Mapper
public interface PaymentDao {
    public int create(Payment payment);
    public Payment getPaymentById(@Param("id") Long id);
}

②mybaits的映射文件PaymentMapper.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.PaymentDao">
    <resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <id column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>

    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into payment(serial) values (#{serial})
    </insert>

    <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
        select * from payment where id = #{id}
    </select>
</mapper>

(4)service

①接口PaymentService

public interface PaymentService {
    public int create(Payment payment);
    public Payment getPaymentById(@Param("id") Long id);
}

②实现类

@Service
public class PaymentServiceImpl implements PaymentService {
    @Resource
    private PaymentDao paymentDao;
    public int create(Payment payment){
        return paymentDao.create(payment);
    }
    public Payment getPaymentById(Long id){
        return paymentDao.getPaymentById(id);
    }
}

(5)controller

@RestController
@Slf4j
public class PaymentController {
    @Resource
    private PaymentService paymentService;

    //把PostMapping改成RequestMapping就能测试成功
    @RequestMapping(value = "/payment/create")
    public CommonResult create(Payment payment){
        int result = paymentService.create(payment);
        log.info("*****插入结果："+result);
        if(result > 0){
            return new CommonResult(200,"插入数据库成功",result);
        }else {
            return new CommonResult(444,"插入数据库失败",null);
        }
    }

    @GetMapping(value = "/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id){
        Payment payment = paymentService.getPaymentById(id);
        log.info("*****插入结果："+payment);
        if(payment != null){
            return new CommonResult(200,"查询成功",payment);
        }else {
            return new CommonResult(444,"没有对应记录，查询ID"+id,null);
        }
    }
}

6、测试

image.png

用postman进行测试：

image.png

三、热部署Devtools

作用：代码改变后自动重启，方便我们调试

只能用在开发阶段，生产上市后必须关闭

1、添加devtools依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <scope>runtime</scope>
    <optional>true</optional>
</dependency>

2、添加plugin在pom.xml

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <configuration>
        <fork>true</fork>
        <addResources>true</addResources>
      </configuration>
    </plugin>
  </plugins>
</build>

3、开启自动build

image.png

4、更新Registry

image.png

5、重启IDEA

四、微服务消费者订单Module模块

1、建modul

2、改pom

3、写yml

server:
  port: 80

4、主启动

@SpringBootApplication
public class OrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class,args);
    }
}

5、业务类

(1)entities

①主实体Payment

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
    private Long id;
    private String serial;
}

②Json封装体CommonResult

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult <T>{
    private Integer code;
    private String message;
    private T data;

    public CommonResult(Integer code,String message){
        this(code,message,null);
    }

}

(2)首说RestTemplate

①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官网地址

docs.spring.io/spring-fram…

③使用

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。

(3)config配置类

ApplicationContextConfig

@Configuration
public class ApplicationContextConfig {
    @Bean
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}
//applicationContext.xml <bean id="" class="">

(4)controller

@RestController
@Slf4j
public class OrderController {
    public static final String PAYMENT_URL = "http://localhost:8001";

    @Resource
    private RestTemplate restTemplate;

    @GetMapping("/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }
}

6、测试

image.png

不要忘记@RequestBody注解

image.png

五、工程重构

系统中有重复部分，重构

1、新建cloud-api-commons

2、改pom

<artifactId>cloud-api-commons</artifactId>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

3、entities

4、maven命令clean install

5、各自粘贴POM内容

<dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
    <groupId>com.atguigu.springboot</groupId>
    <artifactId>cloud-api-commons</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

image.png

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