一、Spring Cloud 微服務

一、服務提供者

    1) Maven配置文件

<?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.itmuch.cloud</groupId>
	<artifactId>microservice-simple-provider-user</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demo1</name>
	<description>Simple for Spring Boot</description>

	<!-- 引入Spring Boot的依賴包 -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<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>Dalston.SR3</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter</artifactId>
		</dependency>
		
		<!-- Spring Boot Actuator 監控端口 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		
		<!-- JPA依賴包 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		
		<!-- Web項目依賴包 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<!-- MySQL -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		
		<!-- Lombok -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		
		<!-- Spring Boot Test -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<!-- 引入 Spring Cloud的依賴  -->
	<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>

	<!-- 添加Spring Boot的Maven插件  -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

    2)  Spring Boot 主程序

package com.itmuch.cloud;

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

@SpringBootApplication
public class Demo1Application {

	public static void main(String[] args) {
		SpringApplication.run(Demo1Application.class, args);
	}
}

    3) Entity 類

package com.itmuch.cloud;

import java.io.Serializable;
import java.math.BigDecimal;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;

import lombok.Data;

import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;

@Data
@Entity
public class User implements Serializable {

	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private Long id;
	
	@Column
	private String username;
	
	@Column
	private String name;
	
	@Column
	private Integer age;
	
	@Column
	private BigDecimal balance;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	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 BigDecimal getBalance() {
		return balance;
	}

	public void setBalance(BigDecimal balance) {
		this.balance = balance;
	}
	
}

    4)  DAO操作

package com.itmuch.cloud;

import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {

}

    5) Controller 控制層

package com.itmuch.cloud;

import org.springframework.beans.factory.annotation.Autowired;
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 {

	@Autowired
	private UserRepository userRepository;
	
	@GetMapping("/{id}")   // 在Spring 4.3規則中，@GetMapping等價於@RequestMapping(method = RequestMethod.GET), 用於簡化， 同理還有@PostMapping, @PutMapping, @DeleteMapping, @PatchMapping等
	public User findById(@PathVariable Long id) {
		User findOne = this.userRepository.findOne(id);
		return findOne;
	}
	
}

    6) 配置文件

server:
  port: 8000
  session:
    timeout: 30
  tomcat:
    max-threads: 0
    uri-encoding: UTF-8
    
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/boot
    username: root
    password: xshdb
    driver-class-name: com.mysql.jdbc.Driver
    
  jpa:
    # Specify the DBMS
    database: MYSQL
    # Show or not log for each sql query
    show-sql: true
    # Hibernate dll auto (create, create-drop, update)
    hibernate:
       ddl-auto: update

二、服務消費者

    1) Maven 配置文件

<?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.itmuch.cloud</groupId>
	<artifactId>microservice-simple-sonsumer-movie</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>demo2</name>
	<description>Simple for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<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>Dalston.SR3</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter</artifactId>
		</dependency>
		
		<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-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<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>

    2)  Spring Boot 主程序

package com.itmuch.cloud;

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 Demo2Application {
	
	@Bean  // 等價於 RestTemplate restTemplate = new RestTemplate();
	public RestTemplate restTemplate() {
		return new RestTemplate();
	}

	public static void main(String[] args) {
		SpringApplication.run(Demo2Application.class, args);
	}
}

    3) Entity 類

package com.itmuch.cloud;

import java.io.Serializable;
import java.math.BigDecimal;

public class User implements Serializable {

	private static final long serialVersionUID = 1L;

	private Long id;
	
	private String username;
	
	private String name;
	
	private Integer age;
	
	private BigDecimal balance;

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	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 BigDecimal getBalance() {
		return balance;
	}

	public void setBalance(BigDecimal balance) {
		this.balance = balance;
	}
	
}

    4) Controller 控制層

package com.itmuch.cloud;

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 UserController {
	
	@Value("${user.userServiceUrl}")   // 在yml文件中已經配置, 解決它的硬編碼問題
	private String userServiceUrl;

	@Autowired
	private RestTemplate restTemplate;
	
	@GetMapping("/user/{id}")   // 在Spring 4.3規則中，@GetMapping等價於@RequestMapping(method = RequestMethod.GET), 用於簡化， 同理還有@PostMapping, @PutMapping, @DeleteMapping, @PatchMapping等
	public User findById(@PathVariable Long id) {
		return this.restTemplate.getForObject(this.userServiceUrl + id, User.class);
	}
	
}

    4） 配置文件

server:
  port: 8100

user:
  userServiceUrl: http://localhost:8000/

三、數據腳本 

CREATE TABLE `user` (
  `id` bigint(20) NOT NULL,
  `username` varchar(50) DEFAULT NULL,
  `name` varchar(50) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  `balance` decimal(10,2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'account1', '張三', '20', '100.00');
INSERT INTO `user` VALUES ('2', 'account2', '李四', '30', '180.00');
INSERT INTO `user` VALUES ('3', 'account3', '王五', '28', '280.00');