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springcloud父级模块pom依赖 springcloud父工程

创建springcloud父子工程遇到的问题

初学spring cloud,按照视频上的步骤创建eureka会出现maven异常和各种前所未见的错误,但是经过反复检查,除了导入的springboot依赖版本不一样之外,无别的不同,基于此,通过查找资料发现,springboot和springcloud版本存在着一些冲突,而目前比较新的springboot 2.2.1.RELEASE和springcloud的F版本应该有些冲突(本人猜想),而使用springcloud的Hoxton.RC2版本和springboot的2.2.x版本没有任何报错,但是RC2属于私服,他针对的是Java11,所以目前的jar包不全,经过我反复试验,发现eureka中的client相关的包没有,所以目前为止最好还是使用springboot 2.0.6.RELEASE和Finchley.RELEASE相结合的版本是最稳定的

基于此自己总结出一种野路子创建springcloud父子工程的方法,用于学习springcloud

首先创建父工程

new project

这里父工程使用spring Initializr,点击next

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_User,第1张

输入包名,父项目名,注意的是type点的是POM(这样父工程不会出现src,比较简洁,不容易出错),点击next

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_maven_02,第2张

此时,什么都不需要选,继续点击next

到此步,检查文件所在位置是否正确,确认后点击finish

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_maven_03,第3张

此时项目是这样的(看起来很简洁),然后修改pom文件

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_User_04,第4张

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>


	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>


	<groupId>com.zz</groupId>
	<artifactId>microservice_parent</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>microservice_parent</name>
	<description>Demo project for Spring Boot</description>
	<!--packageing需要指定为pom-->
	<packaging>pom</packaging>

	<!--子工程目录,每添加一个model,需要将子工程的model名注册到此-->
	<modules>
		<module>provider-user</module>
		<module>consumer-order</module>
	</modules>

	<!--父子工程的一些版本号-->
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>


	<!--让整个工程都是spring cloud-->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>


	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

此时父工程创建完成,创建一个子model(提供者)

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_User_05,第5张

这里选择的也是spring Initializr,点击next,然后输入包名,工程名,注意的是这里的type是maven project,点击next

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_maven_06,第6张

然后还是什么都不需要选,直接点击next,检查文件路径,确认无误后,点击finish

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_spring_07,第7张

配置子model的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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<!--将springboot的parent改成依赖父工程-->
	<parent>
		<groupId>com.zz</groupId>
		<artifactId>microservice_parent</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>

	<groupId>com.zz</groupId>
	<artifactId>provider-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>provider-user</name>
	<description>Demo project for Spring Boot</description>

	<!--packageing指定为jar,子model都需指定成jar-->
	<packaging>jar</packaging>

	<dependencies>

		<!--因为此项目需要访问前端,所以需要导入springboot的web组件-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

因为父子工程的依赖关系所以需要在父工程中的中添加相应的model

这里开始写业务代码,学到springcloud相信都是有一定的基础的,只列出基础逻辑,和代码,具体的不细说

创建了两个类,一个是pojo包中的User,一个是controller包中的UserController,然后需要配置application.yml

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_User_08,第8张

package com.zz.springcloud.pojo;

import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

@Data
@NoArgsConstructor
public class User {

    private Long id;
    private Date date;

    public User(Long id) {
        this.id = id;
        this.date=new Date();
    }
    
}
package com.zz.springcloud.controller;

import com.zz.springcloud.pojo.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    @GetMapping("/user/{id}")
    public User getUser(@PathVariable Long id){
        return new User(id);
    }
    
}
server:
  port: 7900  #程序启动后的端口,也就是tomcat的端口
spring:
  application:
    name: provider-user #应用别名

点击ProviderUserApplication的类中的运行按钮,在网页中输入 http://localhost:7900/user/1

会显示出

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_spring_09,第9张

此时,子工程的provider-user已经完成

继续创建consumer-order的model

和创建provider-user的步骤一样,直接配置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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<parent>
		<groupId>com.zz</groupId>
		<artifactId>microservice_parent</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>

	<groupId>com.zz</groupId>
	<artifactId>consumer-order</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>consumer-order</name>
	<description>Demo project for Spring Boot</description>
	<packaging>jar</packaging>

	<dependencies>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>1.18.10</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

看结构图

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_spring_10,第10张

其中User类和provider中的类保持一致,然后创建OrderController,最后配置application.yml

package com.zz.springcloud.controller;

import com.zz.springcloud.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;


@RestController
public class OrderController {

    @Autowired
    private RestTemplate restTemplate;

    @Value("${user.url}")
    private String url;

    @GetMapping("/order/{id}")
    public User getOrder(@PathVariable Long id){
        User user=restTemplate.getForObject(url+id,User.class);
        return user;
    }
}
server:
  port: 8900
spring:
  application:
    name: consumer-order
user:
  url: http://localhost:7900/user/

此时会发现restTemplate类没有找到,所以还需要把RestTemplate类注入到spring容器中,在ConsumerOrderApplication添加一个方法:

package com.zz.springcloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
public class ConsumerOrderApplication {

	@Bean
	public RestTemplate getRest(){
		return new RestTemplate();
	}

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

}

此时测试consumer的时候需要先启动provider,也就是需要启动两个服务,输入http://localhost:8900/order/1

springcloud父级模块pom依赖 springcloud父工程,springcloud父级模块pom依赖 springcloud父工程_User_11,第11张

此时rest风格的分布式已经完成



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