spring cloud 学习笔记 基础工程的构建(一)

前言

学习一下spring cloud，只是过一遍微服务的一些现代化工具，微服务其实一直都存在，去公司的时候发现一个问题，即使有些项目没有用到现代这些什么docker、k8s，其实也是微服务，微服务一直都存在。

这些东西只是为了微服务更加稳定，让创建微服务更加方便而已。下面笔记基于尚硅谷的spring cloud，工作闲暇之余看了下。

正文

父工程的构建:
pom 文件如下:

很简单的一些配置。比较常规。

spring boot+spring cloud+mybatis+spring alibaba：

<?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>org.springcloud</groupId>
  <artifactId>zhifu</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>Maven</name>
  <!-- FIXME change it to the project's website -->
  <url>http://maven.apache.org/</url>
  <inceptionYear>2001</inceptionYear>

  <distributionManagement>
    <site>
      <id>website</id>
      <url>scp://webhost.company.com/www/website</url>
    </site>
  </distributionManagement>

  <!--统一管理jar包版本-->
  <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>
    <mysql.version>5.1.47</mysql.version>
    <druid.version>1.1.16</druid.version>
    <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
  </properties>
  <!--子模块继承之后，提供作用：锁定版本+子module不用groupId和version-->
  <dependencyManagement>
    <dependencies>
      <!--spring boot 2.2.2-->
      <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>2.1.0.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
      </dependency>
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>${druid.version}</version>
      </dependency>
      <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.spring.boot.version}</version>
      </dependency>
      <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>${junit.version}</version>
      </dependency>
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>${lombok.version}</version>
        <optional>true</optional>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <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>
</project>

支付模块:

<?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>zhifu</artifactId>
        <groupId>org.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>springcloudpayment</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <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>
        <!--mysql-connector-java-->
        <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>

发现没，其实支付模块就是父工程的补充。父工程是：dependencyManagement，子工程是dependencies。

dependencies和dependencyManagement 的关系是，dependencies 才是正在的依赖，当dependencies 中不写版本号的时候，那么会使用父工程的版本号，这样方便版本统一。

子工程才是一个正在的完整的工程，那么需要把yml 文件填写好，主要就是一些配置。spring boot 果然是面向配置编程。

application.yml:

server:
  port: 8001
spring:
  application:
    name: cloud-provider-service
  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/db2019?useUnicode=true&characterEncoding-utr-8&useSSL=false
    username: root
    password: root

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

这里我先把目录结构贴一下:

主启动类:

package com.springcloud;

import org.springframework.boot.SpringApplication;

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

创建完数据库后，建立支付表:

CREATE TABLE `payment`(
	`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
	`serial` varchar(200) DEFAULT '',
	PRIMARY KEY (`id`)
)

然后就是实体类，后面就是我们的dao了。

实体类:

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

统一返回结果的实体类:

package com.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@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);
    }
}

PaymentDao：

package com.springcloud.dao;
import com.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface PaymentDao {

    int create(Payment payment);

    Payment getPaymentById(@Param("id") Long id);
}

上面是映射，我们看下具体的实现:

建立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.springcloud.dao.PaymentDao">
    <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>
    <resultMap id="BaseResultMap" type="com.springcloud.entities.Payment">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="serial" property="serial" jdbcType="VARCHAR"/>
    </resultMap>
</mapper>

那么开始服务接口PaymentService :

package com.springcloud.service;

import com.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;

public interface PaymentService {
    public int create(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);
}

服务接口的实现了:

package com.springcloud.service;

import com.springcloud.dao.PaymentDao;
import com.springcloud.entities.Payment;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@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);
    }
}

建立我们的Controller:

package com.springcloud.Controller;

import com.springcloud.entities.CommonResult;
import com.springcloud.entities.Payment;
import com.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
@Slf4j
public class PaymentController {
    @Resource
    private PaymentService paymentService;

    //只传给前端CommonResult，不需要前端了解其他的组件
    @PostMapping(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,"插入数据成功",result);
        }else{
            return new CommonResult(444,"插入数据失败",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);
        }
    }
}

那么启动一下:

然后看下post:

ok,那么这样就是支付就建设好了。

接下来就是消费者订单模块。

还是一样的套路，建立module:

然后是pom，依赖搞定：

<?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>zhifu</artifactId>
        <groupId>org.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
        <relativePath>../../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-order80</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.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>

然后是配置文件application.yml：

server:
  port: 80

主启动类：

package com.springcloud;

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

实体类：

package com.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

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

还一个是返回结果的实体类：

package com.springcloud.entities;

//CommonResult
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {  //泛型：如果装的payment 返回payment,装的order 返回order

    private Integer code;
    private String message;
    private T data;

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

下面我们就要用消费服务调用我们的支付服务，那么支付服务怎么调用呢？

最简单的方式就是http调用呗，这里使用RestTemplate。

注入容器配置：

package com.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

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

建设controller 层：

package com.springcloud.Controller;

import com.springcloud.entities.CommonResult;
import com.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;

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

    @PostMapping("/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);
    }
}

那么好吧，下面就是开始测试，这里就不贴出来了。

这里我的端口是8002，因为我的80被我的iis占用了。
get 请求:

在这里我们发现一个问题，那就是什么呢？

我们发现这里两个module有很多重复的东西，比如payment这种实体类，又或者说这个CommonResult，这都是重复的。

那么这里就希望他们能放在一个公共的模块中，这里就不多概述了，就是另外建立一个module，然后打包成jar，存入maven，然后依赖拉取。