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三、(准备篇)Maven父子项目搭建—子级篇

三、(准备篇)Maven父子项目搭建—子级篇

作者: 头顶青天_脚踏实地 | 来源:发表于2021-01-06 15:05 被阅读0次

    一、我们的业务是一个订单支付系统,创建两个微服务。一个 order(端口80) 和 payment(端口8001)

    image.png

    二、本文创建 Moudle 的步骤分为 4 步:

    image.png

    1、【建Modile】 :选中父级项目名,new Moudle;选择Maven项目和JDK版本;输入 Moudle 名称

    new Moudle.png
    选择Maven项目.png
    输入 Moudle 名称.png

    可以看到父 pom 中已经存在该Moudle 了


    父 pom.png

    2、【改POM】:引入子 pom 的 <dependencie>

    引入完后记得重新导入Maven的包,点击下图按钮


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

    3、【写YML】:在/src/main/resource 路径下新建 application.yml 文件

    (1)mapperLocations:classpath:mapper/*.xml 表示在resources路径下有个 mapper 文件夹,里面防止映射xml文件。加载的时候会去这里找
    (2)数据库配置的url末尾有个 “useSSL=false” 表示建立SSL连接,子啊mysql的高版本中不设置的话,连接会报错

    server:
      port: 8001
    
    spring:
      application:
        name: cloud-payment-service
    
      datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driver-class-name: org.gjt.mm.mysql.Driver
        url: jdbc:mysql://localhost:3306/db2020?useUnicode=true&characterEncoding=UTF-8&useSSL=false
        username: root
        password: 123456
    
    mybatis:
      mapperLocations: classpath:mapper/*.xml
      type-aliases-package: com.solomon.springcloud.eitities      #所有Entity别名类所在包
    

    (3)踩坑:yml 文件有严格的缩进要求,缩进不对会报错,笔者因为datasource定格了就报了如下错误:

    ***************************
    APPLICATION FAILED TO START
    ***************************
     
    Description:
     
    Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
     
    Reason: Failed to determine a suitable driver class
     
     
    Action:
     
    Consider the following:
        If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
        If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
    
    

    4、【主启动】:

    package com.solomon.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、【写业务】:

    一、建库建表

    1、建Mysql库,字符集选择 utfmb4,该字符集支持4每个字符四个字节,utf8 只支持每个字符3个字节;


    image.png

    2、排序规则选择 utf8mb4_general_ci,它在排序和比较的时候速度较其它更快。

    CREATE TABLE `payment` (
      `id` BIGINT(20) NOT NULL AUTO_INCREMENT,
      `serial` varchar(20) DEFAULT NULL ,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=1 ;
    
    二、写业务代码Controller、Service、Dao、Mapper

    参考gitHub地址 https://github.com/Solomon258/cloud2020/tree/dev

    三、重复上述所有步骤,新建一个子模块 cloud-consumer-order80 用于调用 payment

    1、下图是 cloud-consumer-order80 的 pom.xml

    <?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.solomon.springcloud</groupId>
            <version>1.0-SNAPSHOT</version>
        </parent>
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>cloud-consumer-order80</artifactId>
    
        <dependencies>
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-actuator</artifactId>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
    
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
    </project>
    
    

    2、我们的设计是 order 模块对外暴漏接口,供前端调用,但是 Order 模块自己没有业务逻辑,业务逻辑在 payment 中。所以在 cloud-order-service 服务中,我们只需要一个 Controller 层对外暴漏接口,然后访问 cloud-provider-payment8001 的接口就行。
    (1)写一个配置类,我们通过 RestTemplate 来实现模块间的 Rest 接口调用

    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();
        }
    }
    

    3、写Controller,然后 clean—> install,然后启动两个服务,就可以通过 order 调用 payment 了

    import com.solomon.springcloud.entities.CommonResult;
    import com.solomon.springcloud.entities.Payment;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.client.RestTemplate;
    
    import javax.annotation.Resource;
    
    @RestController
    public class OderController {
    
        @Resource
        private RestTemplate restTemplate;
    
        private final static String PAYMENT_URI = "http://localhost:8001";
    
        @PostMapping("/consumer/create")
        public CommonResult<Payment> create(@RequestBody Payment payment) {
            return restTemplate.postForObject(PAYMENT_URI + "/paymnet/create",payment,CommonResult.class);
        }
    
        @GetMapping("/consumer/get/{id}")
        public CommonResult<Payment> get(@PathVariable("id") Long id) {
            return restTemplate.getForObject(PAYMENT_URI + "/paymnet/getPaymentById/"+id,  CommonResult.class);
        }
    }
    

    参考gitHub地址 https://github.com/Solomon258/cloud2020/tree/dev

    如果觉得有帮助,麻烦给去 GitHub 点一颗小星星哦!
    有任何问题,欢迎评论,喜欢可以点赞收藏,转发请说明出处!

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