1. 父工程构建
1.1 Maven项目搭建
1.2 父工程pom文件
回顾:
① Maven中dependencyManagement和dependencies的区别
Maven使用dependencyManagement元素来提供一种管理依赖版本号的方式。通常会在一个组织或者项 目的最顶层的父POM中看到。使用pom.xml中 的dependencyManagement元素能让所有中引用一个依赖而不用显示的列出版本号。Maven会沿着父子层次向上找,直到找到一个拥有dependencyManagement元素的项目,然后它就会使用这个元素中指定的版本号。另外如果某个子项目需要使用另外的版本只需要声明version即可。注意:dependencyManagement里只是声明依赖,并不实现引入,因此子项目要显示的声明需要的依赖。
② Maven中如何跳过单元测试
在Idea的Maven侧栏点击闪电图标,使Maven跳过test生命周期即可。
<?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.polaris</groupId> <artifactId>com.polaris.springcloud</artifactId> <version>1.0-SNAPSHOT</version> <packaging>pom</packaging> <modules> </modules> <!-- 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modlue不用写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>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>${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>
2. 微服务提供者支付Module模块
cloud-provider-payment8001
2.1 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>com.polaris.springcloud</artifactId> <groupId>com.polaris</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> <!--mysql-connector-java--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!--jdbc--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <!-- 通用配置 --> <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>
2.2 yml配置文件
server: port: 8001 spring: application: name: cloud-payment-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://mpolaris.top:3306/cloud-test?useUnicode=true&characterEncoding=utf-8&useSSL=false username: root password: 123456 mybatis: mapperLocations: classpath:mapper/*.xml type-aliases-package: com.polaris.springcloud.entities # 所有Entity别名类所在包
2.3 主启动类
/** * @Author polaris * @Date 2021/1/21 1:00 */ @SpringBootApplication public class PaymentMain { public static void main(String[] args) { SpringApplication.run(PaymentMain.class,args); } }
2.4 业务类(简单演示)
建表
entities
主实体 与 Json封装体
@Data @AllArgsConstructor @NoArgsConstructor public class Payment implements Serializable { private Long id; private String serial; }
@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); } }
dao
接口PaymentDao与mybatis映射文件PaymentMapper
@Mapper public interface PaymentDao { int save(Payment payment); Payment getPaymentById(@Param("id") Long id); }
<?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.polaris.springcloud.dao.PaymentDao"> <insert id="save" parameterType="Payment" useGeneratedKeys="true" keyProperty="id"> insert into payment(serial) values(#{serial}); </insert> <resultMap id="BaseResultMap" type="com.polaris.springcloud.entities.Payment"> <id column="id" property="id" jdbcType="BIGINT"/> <id column="serial" property="serial" jdbcType="VARCHAR"/> </resultMap> <select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap"> select * from payment where id=#{id}; </select> </mapper>
service
接口与实现类
@Service public class PaymentServiceImpl implements PaymentService { @Resource private PaymentDao paymentDao; @Override public int save(Payment payment) { return paymentDao.save(payment); } @Override public Payment getPaymentById(Long id) { return paymentDao.getPaymentById(id); } }
controller
@RestController @Slf4j @RequestMapping("/payment") public class PaymentController { @Resource private PaymentService paymentService; @PostMapping("/save") public CommonResult save(Payment payment) { int result = paymentService.save(payment); log.info("===> result: " + result); if(result > 0) { return new CommonResult(200,"保存到数据库成功",result); } return new CommonResult(400,"保存到数据库失败",null); } @GetMapping("/get/{id}") public CommonResult<Payment> save(@PathVariable("id") Long id) { Payment paymentById = paymentService.getPaymentById(id); log.info("===> payment: " + paymentById); if(paymentById != null) { return new CommonResult(200,"查询成功",paymentById); } return new CommonResult(400,"查询失败",null); } }
3. 开启Devtools热部署
3.1 聚合父类总工程pom.xml添加配置
<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>
3.2 当前工程添加devtools依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency>
3.3 Idea开启自动编译选项
3.4 开启热注册
快捷键 ctrl + shift + alt + /,打开Registry
勾选
重启Idea,即可测试代码时不用手动重启
注意:该功能只能在开发阶段使用,上线前一定要关闭
4. 微服务消费者订单Module模块
cloud-consumer-order80
4.1 pom.xml
<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>
4.2 yml配置文件
server:
port: 80
4.3 主启动类
4.4 RestTemplate引入
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 客户端模板工具类
如何使用
官网使用:https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
使用restTemplate访问restful接口非常的简单粗暴。
url
REST请求地址requestMap
请求参数ResponseBean.classs
HTTP响应转换被转换成的对象类型
config配置类
@Configuration public class ApplicationContextConfig { @Bean public RestTemplate getRestTemplate() { return new RestTemplate(); } }
4.5 业务类
entities
与提供者支付模块一致
controller
@RestController @Slf4j @RequestMapping("/consumer") public class OrderController { @Resource private RestTemplate restTemplate; private static final String PAYMENT_URL = "http://localhost:8001"; @GetMapping("/payment/save") public CommonResult<Payment> save(Payment payment) { return restTemplate.postForObject(PAYMENT_URL + "/payment/save", payment,CommonResult.class); } @GetMapping("/payment/get/{id}") public CommonResult<Payment> get(@PathVariable("id") Long id) { return restTemplate.getForObject(PAYMENT_URL + "/payment/get/" + id, CommonResult.class); } }
4.6 启动两个模块测试
启动两个模块没有出现Run Dashbord的问题
在工程目录下找.idea文件夹下的workspace.xml添加如下代码即可
<component name="RunDashboard"> <option name="configurationTypes"> <set> <option value="SpringBootApplicationConfigurationType" /> </set> </option> <option name="ruleStates"> <list> <RuleState> <option name="name" value="ConfigurationTypeDashboardGroupingRule" /> </RuleState> <RuleState> <option name="name" value="StatusDashboardGroupingRule" /> </RuleState> </list> </option> </component>
插入成功但是没有内容的问题
解决:支付模块这里一定要加@RequestBody注解
@PostMapping("/save") public CommonResult save(@RequestBody Payment payment) { int result = paymentService.save(payment); log.info("===> result: " + result); if(result > 0) { return new CommonResult(200,"保存到数据库成功",result); } return new CommonResult(400,"保存到数据库失败",null); }
5. 工程重构 - 公共工程模块
5.1 发现问题 - 系统中有重复代码 entities
5.2 新建公共工程 cloud-api-common
重复代码,公共接口,第三方接口,工具类等都可以放在这里
pom.xml
Hutool是一个小而全的Java工具类库,是项目中“util”包友好的替代
<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> <!-- hutool工具类 --> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.1.0</version> </dependency> </dependencies>
5.3 抽取多个模块的共同代码
将cloud-api-common安装到maven仓库
修改订单80和支付8001代码
- 删除各自原先的enntities
- 各自添加pom内容
<!-- 公共模块 --> <dependency> <groupId>com.polaris</groupId> <artifactId>cloud-api-common</artifactId> <version>${project.version}</version> </dependency>
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