Spring cloud learning (1) basic environment construction

Create parent project

The parent project pom.xml

 <packaging>pom</packaging>
<!-- Unified management jar Package version -->
<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>1.1.21</druid.version>
<mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version>
</properties>
<dependencyManagement>
<!-- After sub module inheritance , Provide a role ： Lock version + Son modlue Do not write groupId and version -->
<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>
</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>

Create submodule cloud-provider-payment8001

pom.xml

 <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<!--eureka client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<!-- If there is no version , Look for from the father level , If you find it, you can use it directly , The overall situation is unified -->
</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>
<!-- Thermal deployment -->
<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>

application.yml

server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
# Current data source operation type
type: com.alibaba.druid.pool.DruidDataSource
#mysql Drive pack
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&characterEncoding=utf8&useSSL=false
username: root
password: root
mybatis:
mapperLocations: classpath:mapper/*.xml
# all entity Package of alias class
type-aliases-package: com.yu.springcloud.entities

Main startup class

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

Entity class

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

Unified return result CommonResult

@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 layer

@Mapper
public interface PaymentDao {
int create(Payment payment);
Payment getPaymentById(Long id);
}

mapper( stay resources New under the directory /mapper/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.yu.springcloud.dao.PaymentDao">
<insert id="create" parameterType="com.yu.springcloud.entities.Payment" useGeneratedKeys="true"
keyProperty="id">
insert into payment(serial) values(#{serial});
</insert>
<resultMap id="BaseResultMap" type="com.yu.springcloud.entities.Payment">
<id column="id" property="id" jdbcType="BIGINT"></id>
<id column="serial" property="serial" jdbcType="VARCHAR"></id>
</resultMap>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
select * from payment where id = #{id};
</select>
</mapper>

service

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

@Service
public 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);
}
}

controller

@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@Value("${server.port}")
private String serverPort;
@GetMapping(value = "/payment/lb")
public String getPaymentLb(){
return serverPort;
}
@PostMapping(value = "/payment/create")
public CommonResult create(@RequestBody Payment payment){
int result = paymentService.create(payment);
log.info("***** Insert results ："+result);
if (result>0){
return new CommonResult(200," Insert the success ,serverPort"+serverPort,result);
}else {
return new CommonResult(-1," Insert the failure ,serverPort"+serverPort,result);
}
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id){
Payment payment = paymentService.getPaymentById(id);
log.info("***** Query results "+payment);
if (payment!=null){
return new CommonResult(200," The query is successful ,serverPort:"+serverPort,payment);
}else {
return new CommonResult(-1," There is no corresponding record , Inquire about ID by ："+id,null);
}
}
}

establish cloud-consumer-order80 Sub module

pom.yml

 <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- Thermal deployment -->
<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>

application.yml

server:
port: 8090
spring:
application:
name: cloud-order-service

establish entities( take cloud-provider-payment8001 Under the project of entities Copy the two entity classes under the package )

Main startup class

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

Writing controller Before class , So let's see RestTemplate

summary ：RestTemplate Provides a variety of portable access to remote Http Method of service , It's a simple, portable access restful Service template class , yes Spring Provided for access Rest Client template toolset for services .

Use ：（url,requestMap,ResponseBean.class） These three parameters represent Rest Request address 、 Request parameters 、Http Response to convert the object type being converted

Create a new one config Configuration class

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

controller

@RestController
@Slf4j
public class OrderController {
public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
@Resource
private RestTemplate restTemplate;
@Resource
private DiscoveryClient discoveryClient;
@GetMapping(value = "/consumer/payment/lb")
public String paymentLB(){
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
if (instances == null || instances.size()<=0){
return null;
}
ServiceInstance serviceInstance = loadBalancer.instances(instances);
URI uri = serviceInstance.getUri();
return restTemplate.getForObject(uri+"/payment/lb", String.class);
}
@PostMapping(value = "/consumer/payment/create")
public CommonResult<Payment> create(@RequestBody Payment payment) {
return restTemplate.postForObject(PAYMENT_URL + "/payment/create", payment, CommonResult.class);
}
}

establish cloud-api-commons modular

The problem is ： There are repetitions in the system

pom.xml

<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>
<!--
When optional by true This indicates that the dependency forbids dependency passing
<optional>true</optional>
-->
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.1.1</version>
</dependency>
</dependencies>

take entities The following two entity classes put commons modular

pack commons

This can be done in the above two sub modules entities Package to delete , Modify it pom file , introduce cloud-api-commons Bag can

 <dependency>
<groupId>com.yu.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>