约定 > 配置 > 编码
IDEA新建project工作空间
1 新建Empty Project,类似工作空间
2 新project设置
2.1 project都选择8
2.2 module点击+号,新建一个maven模块
3 新Module的设置
3.1 由于第一个是pom统一工程,不选择模板create from archetype
3.2 group:com.springcloud
项目名:cloud2022
version:1.0-SNAPSHOT
3.3 Language Level 选择 8
4 新project设置
4.1 Editor | File Encodings 设置为UTF8
4.2 Build, Execution, Deployment | Compiler | Annotation Processors 每个module都打勾
4.3 File | Settings | Build, Execution, Deployment | Compiler | Java Compiler 设置为1.8
5 cloud2022该模块下鼠标右键新建其下的子module
5.1 新建子module microservicecloud-api 可以不勾选create from archetype
5.2 IDEA工具右边的maven projects视图刷新,出现新的子模块
5.3 右上角设置,选择Group Modules
5.4 视图上选择+号,选中api里面的pom.xml
6 IDEA工具隐藏.iml等
点击File-->setting(或者Ctrl+Alt+S)-->Editor--> Flie Types 在ignore files and folders,然后在输入框最后面跟上.idea;*.iml;
父工程POM
<?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.atguigu.springcloud</groupId>
<artifactId>mscloud03</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<!-- 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>
Maven工程落地细节复习
Maven中的DependencyManagement和Dependencies
dependencyManagement
Maven 使用dependencyManagement 元素来提供了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dependencyManagement 元素。
使用pom.xml 中的dependencyManagement 元素能让所有在子项目中引用一个依赖而不用显式的列出版本号。
Maven 会沿着父子层次向上走,直到找到一个拥有dependencyManagement 元素的项目,然后它就会使用这个
dependencyManagement 元素中指定的版本号。
这样做的好处就是:如果有多个子项目都引用同一样依赖,则可以避免在每个使用的子项目里都声明一个版本号,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更新,而不需要一个一个子项目的修改 ;另外如果某个子项目需要另外的一个版本,只需要声明version就可。
-
dependencyManagement里只是声明依赖,并不实现引入,因此子项目需要显示的声明需要用的依赖。
-
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该依赖项,并且没有指定具体版本,
才会从父项目中继承该项,并且version和scope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。
maven中跳过单元测试
父工程创建完成执行mvn:install将父工程发布到仓库方便子工程继承
MySQL驱动说明
com.mysql.jdbc.Driver和mysql-connector-java 5一起用。
com.mysql.cj.jdbc.Driver和mysql-connector-java 6 一起用。
com.mysql.cj.jdbc.Driver是mysql-connector-java 6 中的特性,相比mysql-connector-java 5 多了一个时区:serverTimezone,把数据源配置的驱动改一下就好了
org.gjt.mm.mysql.Driver是当时最好的MySQL JDBC,但不是MySQL公司的,然后MySQL将MM的JDBC驱动 收为官方的JDBC驱动,所以将驱动的package也改了,但还保留了org.gjt.mm.mysql.Driver这个路径的引用,也就是你使用新版的JDBC驱动时还可以通过这个来引用,打开下载的新版JDBC驱动的jar文件可以看到,只有一个文件的目录是org.gjt.mm.mysql,就是为了兼容而设计的。
Rest微服务工程构建
微服务提供者支付Module模块
cloud-provider-payment8001:服务提供者proivder
建cloud-provider-payment8001
父工程pom会多一个模块
<modules>
<module>cloud-provider-payment8001</module>
</modules>
改POM
<parent>
<artifactId>cloud2022</artifactId>
<groupId>com.springcloud</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>
<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>
写YML:application.yml
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 com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3307/db2022?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.springcloud.entity # 所有Entity别名类所在包
主启动类:
@SpringBootApplication
public class PaymentMain8001 {
public static void main(String[] args){
SpringApplication.run(PaymentMain8001.class,args);
}
}
业务类
建表SQL
CREATE TABLE `payment` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
`serial` varchar(200) DEFAULT '',
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
实体类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment implements Serializable {
private Long id;
@JsonProperty(value = "serial")
private String serial;
}
通用返回结果类:
@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
@Mapper //import org.apache.ibatis.annotations.Mapper;
public interface PaymentDao
{
public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);
}
对应mapper文件,在src\main\resources\mapper\PaymentMapper.xml路径下
<?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.springcloud.dao.PaymentDao">
<resultMap id="BaseResultMap" type="com.springcloud.entity.Payment">
<id column="id" property="id" jdbcType="BIGINT"/>
<result column="serial" property="serial" jdbcType="VARCHAR"/>
</resultMap>
<insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
INSERT INTO payment(SERIAL) VALUES(#{serial});
</insert>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap" >
SELECT * FROM payment WHERE id=#{id};
</select>
</mapper>
service接口和实现类
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;
@PostMapping(value = "/payment/create")
public CommonResult create(Payment payment)
{
int result = paymentService.create(payment);
log.info("*****插入操作返回结果:" + result);
if(result > 0)
{
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<Payment> getPaymentById(@PathVariable("id") Long id)
{
Payment payment = paymentService.getPaymentById(id);
log.info("*****查询结果:{}",payment);
if (payment != null) {
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);
}
}
}
@PostMapping新增数据时,如果有@RequestBody注解,会找不到类型,加上@JsonProperties也不行
小总结
建module
改POM
写YML
主启动
业务类
热部署Devtools
添加jar
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
下段配置我们粘贴进聚合父类总工程的pom.xml里
<build>
<finalName>你自己的工程名字</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
<addResources>true</addResources>
</configuration>
</plugin>
</plugins>
</build>
idea修改
微服务消费者订单Module模块
cloud-consumer-order80-服务消费者consumer
POM
<parent>
<artifactId>cloud2022</artifactId>
<groupId>com.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-consumer-order80</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.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>
YML
server:
port: 80
主启动类
@SpringBootApplication
public class MainApp80 {
public static void main(String[] args){
SpringApplication.run(MainApp80.class,args);
}
}
实体类和8001服务提供者一致
首说RestTemplate
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集
官网地址
使用
使用restTemplate访问restful接口非常的简单粗暴无脑。
(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。
配置
@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}
controller中使用
@RestController
public class OrderController
{
public static final String PaymentSrv_URL = "http://localhost:8001";
@Autowired
private RestTemplate restTemplate;
@GetMapping("/consumer/payment/create") //客户端用浏览器是get请求,但是底层实质发送post调用服务端8001
public CommonResult create(Payment payment)
{
return restTemplate.postForObject(PaymentSrv_URL + "/payment/create",payment,CommonResult.class);
}
@GetMapping("/consumer/payment/get/{id}")
public CommonResult getPayment(@PathVariable Long id)
{
return restTemplate.getForObject(PaymentSrv_URL + "/payment/get/"+id, CommonResult.class, id);
}
}
测试
http://localhost/consumer/payment/get/1
不要忘记@RequestBody注解--暂时没弄清楚,为什么访问8001为什么不能加上注解
http://localhost/consumer/payment/create?serial=aaaaa1
工程重构
观察问题:
系统中有重复部分,重构
实体类重复了,后期如果有多个项目,实体类会膨胀
新建:cloud-api-commons
POM
<parent>
<artifactId>cloud2022</artifactId>
<groupId>com.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-api-commons</artifactId>
<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>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.1.0</version>
</dependency>
</dependencies>
添加Payment和CommonResult实体类,参照在8001服务提供者模块
maven命令clean install,打包方便其它模块引用
订单80和支付8001分别改造:
删除原来的entity包
引入
<dependency>
<groupId>com.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
自测通过
http://localhost/consumer/payment/get/1
http://localhost/consumer/payment/create?serial=test199