教学视频传送：

springBoot和springCloud的版本选型https://start.spring.io/actuator/info

查看json串返回结果

这就是我们的选型依据

本次开发选用版本如下：

cloud         : Hoxton.SR1boot          : 2.2.2.RELEASEcloud alibaba : 2.1.0.RELEASEjava          : java8Maven         : 3.5及以上Mysql         : 5.7及以上

关于Cloud各种组件的停更、升级、替换

约定>配置>编码

IDEA新建project工作空间

微服务cloud整体聚合工程

父工程步骤New Project

聚合总父工程名字

Maven选版本

工程名字

字符编码

注解生效激活

java编译版本选8

File Type过滤

父工程POM

<?xml version="1.0" encoding="UTF-8"?>

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

org.springframework.boot

spring-boot-starter-parent

2.2.6.RELEASE

com.top

cloud2020-learn

1.0

cloud2020-learn

pom

Demo project for cloud2020-learn

cloud-provider-payment8001

UTF-8

1.8

1.8

4.12

1.2.17

1.16.18

5.1.47

1.1.16

2.2.2.RELEASE

Hoxton.SR1

2.1.0.RELEASE

1.3.0

org.springframework.boot

spring-boot-dependencies

${spring.boot.version}

pom

import

org.springframework.cloud

spring-cloud-dependencies

${spring.cloud.version}

pom

import

com.alibaba.cloud

spring-cloud-alibaba-dependencies

${spring.cloud.alibaba.version}

pom

import

mysql

mysql-connector-java

${mysql.version}

com.alibaba

druid

${druid.version}

org.mybatis.spring.boot

mybatis-spring-boot-starter

${mybatis.spring.boot.version}

org.projectlombok

lombok

${lombok.version}

true

org.springframework.boot

spring-boot-maven-plugin

true

true

nexus-aliyun

Nexus aliyun

http://maven.aliyun.com/nexus/content/groups/public

true

false

Maven工程落地细节复习

Maven中的DependencyManagement和Dependencies

maven中跳过单元测试

父工程创建完成执行mvn:insall将父工程发布到仓库方便子工程继承

Rest微服务工程搭建

构建步骤

1. Cloud-provider-payment8001 微服务提供者Module模块

- 建module

- 改POM

org.springframework.boot

spring-boot-starter-web

org.mybatis.spring.boot

mybatis-spring-boot-starter

com.alibaba

druid-spring-boot-starter

1.1.10

mysql

mysql-connector-java

org.springframework.boot

spring-boot-starter-jdbc

org.projectlombok

lombok

true

org.springframework.boot

spring-boot-starter-test

test

org.junit.vintage

junit-vintage-engine

- 写YML

server:port: 8001spring:application:name: cloud-payment-servicedatasource: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/the_course?useUnicode=true&characterEncoding=utf-8&useSSL=falseusername: rootpassword: aaaaaamybatis:mapperLocations: classpath:mapper/*.xmltype-aliases-package: com.top.cloud.provider.payment8001.entities    # 所有Entity别名类所在包

- 主启动

@SpringBootApplicationpublic class CloudProviderPayment8001Application {

public static void main(String[] args) {

SpringApplication.run(CloudProviderPayment8001Application.class, args);

}

}

- 业务类CommonResult

@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult

{    private Integer code;    private String  message;    private T       data;    public CommonResult(Integer code, String message)

{        this(code,message,null);

}

}Payment

@Data@AllArgsConstructor@NoArgsConstructorpublic class Payment implements Serializable {    private Long id;    private String name;

}PaymentDao

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

}PaymentService

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

}PaymentServiceImpl

@Servicepublic class PaymentServiceImpl implements PaymentService{    @Resource

private PaymentDao paymentDao;    @Override

public int create(Payment payment){        return paymentDao.create(payment);

}    @Override

public Payment getPaymentById(Long id){        return paymentDao.getPaymentById(id);

}

}PaymentMapper.xml

insert into payment(name)  values(#{name});

select * from payment where id=#{id};    PaymentController

@RestController@Slf4jpublic class PaymentController{    @Resource

private PaymentService paymentService;    @Value("${server.port}")

private String serverPort;    @PostMapping(value = "/payment/create")

public CommonResult create(@RequestBody 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,serverPort: "+serverPort,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);        if(payment != null)

{            return new CommonResult(200,"查询成功,serverPort:  "+serverPort,payment);

}else{            return new CommonResult(444,"没有对应记录,查询ID: "+id,null);

}

}

}

- 测试

用postman或者idea自带的HTTPClient测试接口

2. cloud-consumer-order80 微服务消费者订单Module模块

- 建cloud-consumer-order80

- 改POM

org.springframework.boot

spring-boot-starter-web

org.springframework.boot

spring-boot-starter-actuator

org.springframework.boot

spring-boot-devtools

runtime

true

org.projectlombok

lombok

true

org.springframework.boot

spring-boot-starter-test

test

org.junit.vintage

junit-vintage-engine

- 写YML

server:port: 80spring:application:name: cloud-order-service

- 主启动

@SpringBootApplicationpublic class CloudConsumerOrder80Application {

public static void main(String[] args) {

SpringApplication.run(CloudConsumerOrder80Application.class, args);

}

}

- 业务类CommonResult

@Data@AllArgsConstructor@NoArgsConstructorpublic class CommonResult

{    private Integer code;    private String  message;    private T       data;    public CommonResult(Integer code, String message)

{        this(code,message,null);

}

}Payment

@Data@AllArgsConstructor@NoArgsConstructorpublic class Payment implements Serializable {    private Long id;    private String name;

}ApplicationContextConfig

@Configurationpublic class ApplicationContextConfig{    @Bean

//@LoadBalanced

public RestTemplate getRestTemplate(){        return new RestTemplate();

}

}OrderController

@RestController@Slf4jpublic class OrderController{    public static final String PAYMENT_URL = "http://localhost:8001";    @Resource

private RestTemplate restTemplate;    @GetMapping("/consumer/payment/create")

public CommonResult create(Payment payment)

{        return restTemplate.postForObject(PAYMENT_URL +"/payment/create",payment,CommonResult.class);

}    @GetMapping("/consumer/payment/get/{id}")

public CommonResult getPayment(@PathVariable("id") Long id)

{

System.out.println("哈哈");        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);

}    @GetMapping("/consumer/payment/getForEntity/{id}")

public CommonResult getPayment2(@PathVariable("id") Long id)

{

ResponseEntity entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);        if(entity.getStatusCode().is2xxSuccessful()){            return entity.getBody();

}else{            return new CommonResult<>(444,"操作失败");

}

}

}

- 测试http://localhost/consumer/payment/get/1

3. 工程重构观察问题： 系统中有重复部分,重构新建cloud-api-common

就是一个最简单的工程改pom

<?xml version="1.0" encoding="UTF-8"?>

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">

4.0.0

com.top

cloud2020-learn

1.0

com.top

cloud-api-common

1.0

cloud-api-common

Demo project for cloud-api-common

1.8

org.springframework.boot

spring-boot-devtools

runtime

true

org.projectlombok

lombok

true

提取公共部分

maven命令clean install

其他模块依赖 删除各自的原先的entities文件夹

pom中添加：

com.top

cloud-api-common

1.0

修改代码中的依赖路径解决SpringBoot项目repackage failed: Unable to find main class Maven打包 install的问题

发现父项目有一个打包的插件

org.springframework.boot

spring-boot-maven-plugin

repackage

这时，问题就出现了，报打包失败错误！！！解决：如果你的项目是一个放置通用工具类的工程，那么该项目中，就不能包括上面这个打包插件，如果你这个工具类工程依赖有父工程，那么父工程中也不能包括该打包插件，只有你的项目是一个web项目时，含有Main方法的程序入口类，要加该打包插件，我放在了父工程的pom文件中，那就是代表了所有子模块都有这个打包插件，所以报错，解决就是去掉这个插件 ，只在web工程中加入这个打包插件！

目前工程样图