1. 父工程构建
1.1 Maven项目搭建
环境 | 版本 |
---|---|
JDK | 1.8 |
Maven | 3.6+ |
Maven模板 | maven-archetype-size |
删除父工程src文件 |
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>springcloud2020</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
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>