springcloud (一) 介绍

开启springcloud 之旅...

传统单体架构：

微服务架构：

每个模块独立运行，就是独立的进程。

接下来基于springboot 来构建微服务：

1， 客户端-》订单微服务-》用户微服务

订单微服务结构：

pom.xml:

<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.tuling.springcloud</groupId>
	<artifactId>03-microservice-order</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>03-microservice-order</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
	</parent>
	<dependencies>
		<!-- Spring WEB -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- Test -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- 集成Mybatis -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
	</dependencies>

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

OrderController：

package com.tuling.springcloud.api;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping("/order")
public class OrderController {
	private final Logger logger = LoggerFactory.getLogger(OrderController.class);

	@Autowired
	private RestTemplate restTemplate;

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

    @RequestMapping("/user/getById")
    public Object getUserById(String userId) {
    	String url = userByIdUrl + "?id=" + userId;
    	logger.debug("param userId : {}, request url : {}", userId, url);
    	Object result = restTemplate.getForEntity(url, Object.class);
        return result;
    }
}

CommonConfig.java:

package com.jiagoushi.springcloud.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class CommonConfig {

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

　　

application.properties

server.port=8082
## db config
spring.datasource.url=jdbc:mysql://localhost:3306/springcloud
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

## log
logging.level.root=INFO
logging.level.org.springframework.web=DEBUG
logging.level.com.tuling.springcloud=DEBUG

user.getUserByIdUrl=http://localhost:8083/user/getById

订单application.properties: user.getUserByIdUrl=http://localhost:8083/user/getById 是用户微服务地址

---

用户微服务结构：

pom.xml:

<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.tuling.springcloud</groupId>
	<artifactId>03-microservice-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>03-microservice-user</name>
	<url>http://maven.apache.org</url>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
	</parent>
	<dependencies>
		<!-- Spring WEB -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- Test -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!-- 集成Mybatis -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.1.1</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
	</dependencies>

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

　　UserController.java

package com.tuling.springcloud.api;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.tuling.springcloud.bean.User;
import com.tuling.springcloud.service.UserService;

@RestController
@RequestMapping("/user")
public class UserController {
	private final Logger logger = LoggerFactory.getLogger(UserController.class);

	@Autowired
	private UserService userService;

    @RequestMapping("/getById")
    public User getUserById(String id) {
    	logger.debug("param id : {}", id);
        return this.userService.findById(Integer.parseInt(id));
    }

}

　　UserService.java:

package com.tuling.springcloud.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.tuling.springcloud.bean.User;
import com.tuling.springcloud.mapper.UserMapper;

@Service
public class UserService {
    private final Logger logger = LoggerFactory.getLogger(UserService.class);

    @Autowired
    private UserMapper userMapper;

    public User findById(Integer id){
        logger.debug("param id : {}" , id);
        User u = this.userMapper.findById(id);
        logger.debug("result name : {}" , u.getName());
        return u;
    }
}

UserMapper

package com.tuling.springcloud.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.tuling.springcloud.bean.User;
import com.tuling.springcloud.mapper.UserMapper;

@Service
public class UserService {
    private final Logger logger = LoggerFactory.getLogger(UserService.class);

    @Autowired
    private UserMapper userMapper;

    public User findById(Integer id){
        logger.debug("param id : {}" , id);
        User u = this.userMapper.findById(id);
        logger.debug("result name : {}" , u.getName());
        return u;
    }
}

User

package com.tuling.springcloud.bean;
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private String address;
    private String phone;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }

}

application.properties

server.port=8083
## db config
spring.datasource.url=jdbc:mysql://localhost:3306/springcloud
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

## log
logging.level.root=INFO
logging.level.org.springframework.web=DEBUG
logging.level.com.tuling.springcloud=DEBUG

order 微服务 通过spring提供的 RestTemplate这个类来调用微服务。

2个微服务都启动之后，客户端直接访问订单微服务，就可以得到结果。因为订单微服务通过rest调用了用户微服务去查数据库了

总结：

1，这次是一个简单的微服务相互之间调用，每个微服务之间都可以有自己独立的数据库，也可没有。

2，这种微服务之间相互依赖，耦合度强，如何集群的话就不知道调哪个微服务，所以需要eureka来做注册中心

欢迎来QQ群：592495675 一起研究 java技术，群里技术大佬，还有所有springCloud 学习源代码