elipse下使用SpringBoot+maven创建多模块项目

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分类专栏： # SpringCloud 文章标签： SpringBoot 微服务

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本文介绍了一个简单的微服务实践案例，通过创建生产者和消费者项目，使用Spring Boot搭建微服务架构，实现服务间的数据交互。文章详细展示了如何配置项目、编写代码，并通过RestTemplate进行服务调用。

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这里只使用一个生产者和一个消费者的例子

1.创建总的项目

pom.xml

<?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>per.czt</groupId>
	<artifactId>microservicedemo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>pom</packaging>
	<modules>
		<module>consumer-order</module>
		<module>provider-user</module>
	</modules>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
	</parent>
	<dependencies>
		

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

		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.2.3</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.3</version>
		</dependency>

	</dependencies>
	<build>
		<plugins>
			<plugin>

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

			</plugin>
		</plugins>
	</build>
</project>

2.创建生产者项目和消费者项目

在总的项目下分别新建一个maven module，一个provider-user，另一个为consumer-order
provider-user的pom.xml

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>per.czt</groupId>
		<artifactId>microservicedemo</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<groupId>per.czt</groupId>
	<artifactId>provider-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>provider-user</name>
	<url>http://maven.apache.org</url>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>


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

	</dependencies>
</project>

consumer-order的pom.xml

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>per.czt</groupId>
		<artifactId>microservicedemo</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<groupId>per.czt</groupId>
	<artifactId>consumer-order</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>consumer-order</name>
	<url>http://maven.apache.org</url>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>3.8.1</version>
			<scope>test</scope>
		</dependency>


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

创建完成后项目目录如下

provider-user项目
在这里插入图片描述
consumer-order的目录

总项目的目录

3.编写生产者代码，测试

在src/main/resources下新建application.properties配置文件

server.port=7900
spring.application.name=provider-user

新建一个User类

package org.provider.user.pojo;



public class User {
	
	private Long id;
	private java.util.Date date;
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public java.util.Date getDate() {
		return date;
	}
	public void setDate(java.util.Date date) {
		this.date = date;
	}
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", date=" + date + "]";
	}
	public User(Long id) {
		super();
		this.id = id;
		this.date=new java.util.Date();
		
	}
}

编写UserController

package org.provider.user.controller;

import org.provider.user.pojo.User;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
	@RequestMapping(value="/user/{id}",method=RequestMethod.GET)
	public User getUser(@PathVariable("id")Long id) {
		return new User(id);
	}

}

编写启动类

package org.provider.user;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class ProviderUser 
{
    public static void main( String[] args )
    {
        SpringApplication.run(ProviderUser.class, args);
    }
}

启动该项目
在这里插入图片描述

4.编写消费者代码，测试

application.properties

server.port=8900
spring.application.name=consumer-order
user.url=http://127.0.0.1:7900/user/

同样新建一个User类

package org.consumer.order.pojo;

import java.util.Date;

public class User {

	private Long id;
	private java.util.Date date;
	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public java.util.Date getDate() {
		return date;
	}
	public void setDate(java.util.Date date) {
		this.date = date;
	}
	@Override
	public String toString() {
		return "User [id=" + id + ", date=" + date + "]";
	}
	public User(Long id) {
		super();
		this.id = id;
		this.date=new Date();
	}
	public User() {
		super();
		// TODO Auto-generated constructor stub
	}
}

编写OrderController

package org.consumer.order.controller;

import org.consumer.order.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;//spring提供的用于访问rest接口的模板对象
	@Value("${user.url}")
	private String url;
	@GetMapping("/order/{id}")
	public User getOrder(@PathVariable("id")Long id) {
		//访问提供者,获取数据
		User user=restTemplate.getForObject(url+id, User.class);
		return user;
	}

}

编写启动类

package org.consumer.order;

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

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class ConsumerOrder 
{
    //获取RestTemplate对象
	@Bean//相当于xml中的Bean标签,主要用于调用当前方法获取到指定对象
	public RestTemplate getRestTemplate() {
		return new RestTemplate();
	}
    public static void main( String[] args )
    {
        SpringApplication.run(ConsumerOrder.class, args);
    }
}

启动该项目
在这里插入图片描述
分析:这里我们使用application.properties中获取User服务，然而如果url地址坏了或出现问题或者该服务停了怎么办。这里我们可用微服务框架springcloud，dubbo等，框架里包含了服务的注册与发现的服务组件，可以为我们解决这些问题。