課程的edgeService依賴于課程服務的dubbo服務，對外提供的restAPI，跟用戶的EdgeService有點類似，只是一個調用的是thrift，一個調用的是dubbo，比較特殊的是課程的EdgeService需要用戶登錄后才可以訪問，如果沒有登錄的話，需要跳轉到登錄系統才可以訪問。
新建模塊course-edge-servce
- pom增加依賴
<?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">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.3.RELEASE</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.idig8</groupId>
<artifactId>course-edge-service</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>commons-lang</groupId>
<artifactId>commons-lang</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>io.dubbo.springboot</groupId>
<artifactId>spring-boot-starter-dubbo</artifactId>
<version>1.0.0</version>
</dependency>
<dependency>
<groupId>com.idig8</groupId>
<artifactId>course-dubbo-service-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.idig8</groupId>
<artifactId>user-edge-service-client</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
</dependencies>
</project>
- controller 調用course-dubbo-service-api 中的接口
package com.idig8.course.controller;
import com.alibaba.dubbo.config.annotation.Reference;
import com.idig8.course.dto.CourseDTO;
import com.idig8.course.service.ICourseService;
import com.idig8.thrift.user.dto.UserDTO;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import java.util.List;
/**
* Created by Michael on 2017/11/4.
*/
@Controller
@RequestMapping("/course")
public class CourseController {
@Reference
private ICourseService courseService;
@RequestMapping(value = "/courseList", method = RequestMethod.GET)
@ResponseBody
public List<CourseDTO> courseList(HttpServletRequest request) {
UserDTO user = (UserDTO)request.getAttribute("user");
System.out.println(user.toString());
return courseService.courseList();
}
}
- 增加filter組件
package com.idig8.course.filter;
import com.idig8.thrift.user.dto.UserDTO;
import com.idig8.user.client.LoginFilter;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Created by liming.
*/
@Component
public class CourseFilter extends LoginFilter {
@Value("${user.edge.service.addr}")
private String userEdgeServiceAddr;
@Override
protected String userEdgeServiceAddr() {
return userEdgeServiceAddr;
}
@Override
protected void login(HttpServletRequest request, HttpServletResponse response, UserDTO userDTO) {
request.setAttribute("user", userDTO);
}
}
- 啟動類
package com.idig8.course;
import com.idig8.course.filter.CourseFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import java.util.ArrayList;
import java.util.List;
/**
* Created by liming
*/
@SpringBootApplication
public class ServiceApplication {
public static void main(String args[]) {
SpringApplication.run(ServiceApplication.class, args);
}
@Bean
public FilterRegistrationBean filterRegistrationBean(CourseFilter courseFilter ) {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(courseFilter);
List<String> urlPatterns = new ArrayList<String>();
urlPatterns.add("/*");
filterRegistrationBean.setUrlPatterns(urlPatterns);
return filterRegistrationBean;
}
}
- application.properties
server.port=8081
#dubbo config
spring.dubbo.application.name=course-service
spring.dubbo.registry.address=zookeeper://47.98.183.16:2181
spring.dubbo.scan=com.idig8.course
user.edge.service.addr=127.0.0.1:8082
業務流程梳理
- 課程EdgeService 依賴用戶EdgeService服務，Thrift用戶服務，課程服務。
- 課程 EdgeService pom 依賴了用戶登錄user-edge-service-client，user-edge-service-client用于檢測用戶是否登錄功能。需要調用用戶的服務。
- 當用戶完成登錄后，課程EdgeService 訪問課程服務，獲取課程的列表信息。
- 課程EdgeService 依賴用戶EdgeService服務，Thrift用戶服務登錄控制，登錄后的跳轉功能。
- 課程EdgeService 依賴與course-dubbo-service-api服務，用于獲取課程信息和用戶的課程信息。
梳理下dubbo的思路
- 建立對應的api項目定義方法。最終提供一個jar包供調用方和服務提供方使用。
- 服務實現方引用api項目，實現里面的功能，提供端口，名稱，地址，zookeeper監控中心。
- 服務調用方引用api項目，引用zookeeper的監控中心發現服務。直接調用服務就可以用服務實現方的方法了。
程序演示
- 啟動服務（按照順序）
- user-thrift-service
- user-edge-service
- course-dubbo-service
- course-edge-service
- 界面演示
- 訪問http://127.0.0.1:8081 自動跳轉到http://127.0.0.1:8082/user/login
- 登錄獲取到token
3.訪問地址http://127.0.0.1:8081/course/courseList?token=ux4g5z98mowv0qr6r6e6ietdo00nh0vl
PS：微服務跟之前說的一樣就是互相通過RPC的方式進行通信，之間有自己的數據庫，只是RPC暴露接口的方式來獲取其他的微服務之間的數據。
