『高级篇』docker之开发课程EdgeService（16）

新建模块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 调用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组件

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.
 */@Componentpublic 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);
    }
}

• 启动类

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
 */@SpringBootApplicationpublic 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 configspring.dubbo.application.name=course-service
spring.dubbo.registry.address=zookeeper://47.98.183.16:2181spring.dubbo.scan=com.idig8.course

user.edge.service.addr=127.0.0.1:8082

业务流程梳理

1. 课程EdgeService 依赖用户EdgeService服务，Thrift用户服务，课程服务。

2. 课程 EdgeService pom 依赖了用户登录user-edge-service-client，user-edge-service-client用于检测用户是否登录功能。需要调用用户的服务。

3. 当用户完成登录后，课程EdgeService 访问课程服务，获取课程的列表信息。

4. 课程EdgeService 依赖用户EdgeService服务，Thrift用户服务登录控制，登录后的跳转功能。

5. 课程EdgeService 依赖与course-dubbo-service-api服务，用于获取课程信息和用户的课程信息。

梳理下dubbo的思路

1. 建立对应的api项目定义方法。最终提供一个jar包供调用方和服务提供方使用。

2. 服务实现方引用api项目，实现里面的功能，提供端口，名称，地址，zookeeper监控中心。

3. 服务调用方引用api项目，引用zookeeper的监控中心发现服务。直接调用服务就可以用服务实现方的方法了。

程序演示

• 启动服务（按照顺序）

1. user-thrift-service

2. user-edge-service

3. course-dubbo-service

4. course-edge-service

• 界面演示

1. 访问http://127.0.0.1:8081 自动跳转到http://127.0.0.1:8082/user/login

2. 登录获取到token
   3.访问地址http://127.0.0.1:8081/course/courseList?token=ux4g5z98mowv0qr6r6e6ietdo00nh0vl

作者：IT人故事会
链接：https://www.jianshu.com/p/6022a1f4229d