service是spring-cloud中的微服務節點，具體實現了模塊的業務（用戶中心、工作流中心、某業務模塊等等），同樣支持負載。
增加依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.5</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatisplus-spring-boot-starter</artifactId>
<version>1.0.5</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus</artifactId>
<version>2.1.9</version>
</dependency>
增加了web、mybatis-plus、druid的支持，基本的業務模塊這幾個應該是需要的，后續再補充定時任務、MQ、redis等
yml配置
# 公共配置
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8010/eureka/ #eureka服務注冊地址
mybatis-plus:
mapper-locations: classpath:/com/eqlian/*/mapper/*Mapper.xml
#實體掃描，多個package用逗號或者分號分隔
typeAliasesPackage: com.**.entity
global-config:
#主鍵類型 0:"數據庫ID自增", 1:"用戶輸入ID",2:"全局唯一ID (數字類型唯一ID)", 3:"全局唯一ID UUID";
id-type: 3
#字段策略 0:"忽略判斷",1:"非 NULL 判斷"),2:"非空判斷"
field-strategy: 2
#駝峰下劃線轉換
db-column-underline: true
#刷新mapper 調試神器
refresh-mapper: true
configuration:
map-underscore-to-camel-case: true
cache-enabled: false
spring:
datasource:
name: test
url: jdbc:mysql://192.168.0.1:3306/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false
username: root
password: root
# 使用druid數據源
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20
application:
name: service-system
server:
port: 8911
啟動類
@ComponentScan("com.**.controller")
@ComponentScan("com.**.service")
@EnableEurekaClient
@SpringBootApplication
public class SmApplication {
public static void main(String[] args) {
SpringApplication.run(SmApplication.class, args);
}
}
config
@Configuration
@MapperScan("com.eqlian.**.mapper")
public class MybatisPlusConfig {
/*
* 分頁插件，自動識別數據庫類型
* 多租戶，請參考官網【插件擴展】
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
return new PaginationInterceptor();
}
}
@Component
public class SpringContextAware implements ApplicationContextAware {
private static ApplicationContext applicationContext;
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
SpringContextAware.applicationContext = applicationContext;
}
public static ApplicationContext getApplicationContext() {
return applicationContext;
}
public static <T> T getBean(String name){
return (T) applicationContext.getBean(name);
}
}
controller
@RestController
@RequestMapping(value = "/user")
public class UserController {
@Autowired
private IUserService userService;
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
public User get(@PathVariable("id") String id) {
return userService.getById(id);
}
}
service
@Service
public class UserService extends ServiceImpl<UserMapper, User> implements IUserService {
@Override
public User getById(String id) {
return selectById(id);
}
}
mapper
public interface UserMapper extends BaseMapper<User> {
// 這里可寫其他復雜查詢，簡單的增刪改查用serviceimpl提供的接口即可滿足
}
entity
@TableName("t_user")
@Data
public class User extends Model<User> {
@TableId(value = "pk_user", type = IdType.UUID)
private String pkUser;
/**
* 姓名
*/
private String name;
/**
* 密碼
*/
private String password;
/**
* 用戶名、登錄名
*/
private String username;
/**
* 狀態：0=啟用，1=禁用
*/
private Integer status;
@Override
protected Serializable pkVal() {
return getPkUser();
}
}
基本的查詢就寫完了，啟動服務自動連接到注冊中心。
這里接口的地址是 http://localhost:8911/user/{id} 但我們肯定不會把這個地址暴露出去
zuul網關這時會把這個接口代理出去，所以前端無需關心微服務真正的ip地址，只需要請求zuul代理的路徑即可。
再講一下zuul代理的規則
zuul:
routes:
sm:
path: /demo/system/**
serviceId: service-system
可以看到zuul里配置路由規則是將所有/demo/system/**的請求路由到service-system這個微服務上，而service-system則是咱們在yml中設置的微服務id。
至此一個最簡單的查詢模塊就開發和發布完成了。
PS: 如何負載均衡？
很簡答，你這個微服務模塊啟動2個進程注冊到注冊中心就會自動負載了，serviceid相同但ip:port不同。
