二、微服务代码构建
Spring Cloud的编程是约定 > 配置 > 编码
- 聚合总工程名字
- 字符编码
- 注解生效激活
- java编译版本选8
①、启动run dashboard
进入项目，找到 .idea/workspace.xml 文件找到component 标签添加如下组件，重启IDEA
<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>
<!-- 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>
2.Adding plugin to your pom.xml
<!--下一段配置黏贴到父工程当中的pom里--> <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.Enabling automatic build
4.Update the valu+e of
组合键 ctrl+shift+alt+/
5.重启IDEA
<package>pom</package> <!-- 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>
dependencyManagement
Maven 使用dependencyManagement元素来提供一种管理依赖版本号的方式。通过会在一个组织或者项目的最顶层的父POM中看到dependencyManagement元素。
使用pom.xml中的dependencyManagement元素让所有所在项目中引用一个引来而不用显示的列出版本号。Maven会沿着父子层向上走，知道找到一个拥有dependencyManagement元素的项目，然后就会使用dependencyManagement元素中的版本号。
这样做的好处就是：如果有多个子项目都引用同样一个依赖，则可以避免在每个使用子项目里面都声明一个版本号，这样当想升级或切换到另一个版本时，只需要在顶层父容器里面更新，而不需要一个一个子项目修改，另外如果某个子项目需要另一个版本，只需要声明version就可以。
dependencyManagement里之声明依赖，并不对实现县引入，因此子项目需要显示的声明需要的用的依赖
如果不在子项目中声明依赖，是不会从父项目中继承下来的；只有在子项目中写了依赖，并且没有指定具体版本，才会从父项目中继承该项目，并且version和scop都读取自父pom
如果子项目中指定了版本号，那么会使用子项目中指定的jar版本
新建Spring Boot Model名称：cloud-provider-payment8001
pom.xml添加如下依赖
<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> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</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> </dependencies>
编写配置文件application.yml
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/db1022?useUnicode=true&characterEncoding=utf-8&useSSL=false username: root password: root mybatis: mapperLocations: classpath:sqlMapper/*.xml type-aliases-package: com.jdy.springcloud.entities
@SpringBootApplication public class Cloud_Provider_Payment8001 { public static void main(String[] args) { SpringApplication.run(Cloud_Provider_Payment8001.class, args); } }
建表SQL
CREATE TABLE `payment` ( `id` BIGINT(20) COMMENT 'ID', `serial` VARCHAR(200) DEFAULT '' ) ENGINE=INNODB DEFAULT CHARSET=utf8
entitles
@Data @AllArgsConstructor @NoArgsConstructor public class Payment implements Serializable { private Long id; private String serial; }
//Json封装体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); } }
mybatis的映射文件PaymentMapper.xml
路径：src\main\resources\sqlMapper\PaymentMapper.xml
idea 添加Mapper文件头： https://blog.csdn.net/zhangxl123liang/article/details/80968400
@Mapper public interface PaymentDao { public Payment getPaymentById(Long id); public int addPayment(Payment payment); }
<?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.jdy.springcloud.dao.PaymentDao"> <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id"> insert into payment(id,serial) values(#{id},#{serial}); </insert> <resultMap id="BaseResultMap" type="com.jdy.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>
controller
@RestController @Slf4j public class PaymentController { @Resource private PaymentDao mapper; @PostMapping(value = "/payment/create") public CommonResult create(Payment payment){ log.info("*****插入payment："+payment); int result = mapper.addPayment(payment); log.info("*****插入结果："+result); if (result>0){ //成功 return new CommonResult(200,"插入数据库成功",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 = mapper.getPaymentById(id); log.info("*****查询结果："+payment); if (payment!=null){ //说明有数据，能查询成功 return new CommonResult(200,"查询成功",payment); }else { return new CommonResult(444,"没有对应记录，查询ID："+id,null); } } }
测试
-
post请求：postman模拟post
建module
改POM
写YML
主启动
2.2、微服务消费者
新建Spring Boot Model名称：cloud-consumer-order80
pom.xml添加如下依赖
<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>
编写配置文件application.yml
server:
port: 80
主启动类
@SpringBootApplication public class OrderMain80 { public static void main(String[] args) { SpringApplication.run(OrderMain80.class,args); } }
业务类
-
-
创建entities(将cloud-provider-payment8001工程下的entities包下的两个实体类复制过来)
-
RestTemplate
-
-
RestTemplate提供了多种便捷访问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集。
<T> T postForObject(URI url, Object request, Class<T> responseType)
<T> T getForObject(URI url, Class<T> responseType)
使用RestTemplate访问restful接口非常简单（url,requestMap,ResponseBean.class）这三个参数分别代表REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。
//让Spring管理RestTemplate @Configuration public class ApplicationContextConfig { @Bean public RestTemplate getRestTemplate(){ return new RestTemplate(); } }
创建controller
@RestController @Slf4j public class OrderController { public static final String PAYMENT_URL = "http://localhost:8001"; @Resource private RestTemplate restTemplate; @GetMapping("/consumer/payment/create") public CommonResult<Payment> create(Payment payment){ return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class); //写操作 } @GetMapping("/consumer/payment/get/{id}") public CommonResult<Payment> getPayment(@PathVariable("id") Long id){ return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class); } }
测试
-
-
先启动cloud-provider-payment8001
-
再启动cloud-consumer-order80
-
观察问题，系统中Payment和CommonResult重复部分，重构
新建maven项目Model： cloud-api-commons
<dependencies> <!-- 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> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all --> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.1.0</version> </dependency> </dependencies> </project>
<dependency> <groupId>com.jdy.springcloud</groupId> <artifactId>cloud-api-commons</artifactId> <version>${project.version}</version> </dependency>
