spring cloud 项目

### 项目需求

客户端：针对普通用户，用户登录、用户退出、菜品订购、我的订单。

后台管理系统：针对管理员，管理员登录、管理员退出、添加菜品、查询菜品、修改菜品、删除菜品、订单处理、添加用户、查询用户、删除用户。


account 提供账户服务：用户和管理的登录退出。

menu 提供菜品服务：添加菜品、删除菜品、修改菜品、查询菜品。

order 提供订单服务：添加订单、查询订单、删除订单、处理订单。

user 提供用户服务：添加用户、查询用户、删除用户。

分离出一个服务消费者，调用以上四个服务提供者，服务消费者包含了客户端的前端页面和后台接口、后台管理系统的前端页面和后台接口。用户 / 管理员直接访问的资源都保存在服务消费者中，服务消费者根据具体的需求调用四个服务提供者的业务逻辑，通过 Feign 实现负载均衡。

四个服务提供者和一个服务消费者都需要在注册中心进行注册，同时可以使用配置中心来对配置文件进行统一集中管理。


- 创建父工程，pom.xml

```xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.7.RELEASE</version>
</parent>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- JDK 9 缺失jar -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>

<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.0</version>
</dependency>

<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-core</artifactId>
<version>2.3.0</version>
</dependency>

<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
</dependencies>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.SR2</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
```

> 注册中心

- pom.xml

```xml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```

- application.yml

```yaml
server:
port: 8761
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
register-with-eureka: false
fetch-registry: false
```

- 启动类

```java
package com.southwind;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class,args);
}
}
```

> 配置中心

- pom.xml

```xml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```

- application.yml

```yaml
server:
port: 8762
spring:
application:
name: configserver
profiles:
active: native
cloud:
config:
server:
native:
search-locations: classpath:/shared
```

- 在 shared 路径下创建各个微服务对应的配置文件

client-dev.yml

```yaml
server:
port: 8030
spring:
application:
name: client
thymeleaf:
prefix: classpath:/static/
suffix: .html
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
instance:
prefer-ip-address: true
```

menu-dev.yml

```yaml
server:
port: 8020
spring:
application:
name: menu
datasource:
name: orderingsystem
url: jdbc:mysql://localhost:3306/orderingsystem?useUnicode=true&characterEncoding=UTF-8
username: root
password: root
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
instance:
prefer-ip-address: true
mybatis:
mapper-locations: classpath:/mapping/*.xml
type-aliases-package: com.southwind.entity
```

- 启动类

```java
package com.southwind;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigServerApplication.class,args);
}
}
```

> 服务提供者 order

- pom.xml

```xml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```

- bootstrap.yml

```yaml
spring:
application:
name: order
profiles:
active: dev
cloud:
config:
uri: http://localhost:8762
fail-fast: true
```

- Handler

```java
package com.southwind.controller;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/order")
public class OrderHandler {

@Value("${server.port}")
private String port;

@GetMapping("/index")
public String index(){
return "order的端口："+this.port;
}
}
```

- 启动类

```java
package com.southwind;

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

@SpringBootApplication
public class OrderApplication {
public static void main(String[] args) {
SpringApplication.run(OrderApplication.class,args);
}
}
```

> 服务提供者 menu

- pom.xml

```xml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>

<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```

- bootstrap.yml

```yaml
spring:
application:
name: menu
profiles:
active: dev
cloud:
config:
uri: http://localhost:8762
fail-fast: true
```

- Handler

```java
package com.southwind.controller;

import com.southwind.entity.Menu;
import com.southwind.repository.MenuRepository;
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.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping("/menu")
public class MenuHandler {
@Value("${server.port}")
private String port;

@Autowired
private MenuRepository menuRepository;

@GetMapping("/index")
public String index(){
return this.port;
}

@GetMapping("/findAll/{index}/{limit}")
public List<Menu> findAll(@PathVariable("index") int index,@PathVariable("limit") int limit){
return menuRepository.findAll(index, limit);
}
}
```

- 启动类

```java
package com.southwind;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.southwind.repository")
public class MenuApplication {
public static void main(String[] args) {
SpringApplication.run(MenuApplication.class,args);
}
}
```

- Menu 实体类

```java
package com.southwind.entity;

import lombok.Data;

@Data
public class Menu {
private long id;
private String name;
private double price;
private String flavor;
}
```

- 创建 MenuRepository 接口

```java
package com.southwind.repository;

import com.southwind.entity.Menu;

import java.util.List;

public interface MenuRepository {
public List<Menu> findAll();
public int count();
public Menu findById(long id);
public void save(Menu menu);
public void update(Menu menu);
public void deleteById(long id);
}
```

- resources 路径下创建 mapping 文件夹，存放 Mapper.xml

```xml
<?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.southwind.repository.MenuRepository">

<select id="findAll" resultType="Menu">
select * from t_menu limit #{param1},#{param2}
</select>

<select id="count" resultType="int">
select count(id) from t_menu
</select>

<select id="findById" parameterType="long" resultType="Menu">
select * from t_menu where id = #{id}
</select>

<insert id="save" parameterType="Menu">
insert into t_menu(name,price,flavor) values(#{name},#{price},#{flavor})
</insert>

<update id="update" parameterType="Menu">
update t_menu set name = #{name},price = #{price},flavor = #{flavor} where id = #{id}
</update>

<delete id="deleteById" parameterType="long">
delete from t_menu where id = #{id}
</delete>
</mapper>
```

> 服务消费者 client

- pom.xml

```xml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```

- bootstrap.yml

```yaml
spring:
application:
name: client
profiles:
active: dev
cloud:
config:
uri: http://localhost:8762
fail-fast: true
```

- 启动类

```java
package com.southwind;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableFeignClients
public class ClientApplication {
public static void main(String[] args) {
SpringApplication.run(ClientApplication.class,args);
}
}
```