3 在线学习接口 3.1 需求分析
根据下边的业务流程，本章节完成前端学习页面请求学习服务获取课程视频地址，并自动播放视频。
3.2 搭建开发环境
3.2.1 创建数据库
创建xc_learning数据库，学习数据库将记录学生的选课信息、学习信息。
导入：资料/xc_learning.sql
3.2.2 创建学习服务工程
参考课程管理服务工程结构，创建学习服务工程：
pom.xml
[AppleScript] 纯文本查看 复制代码 <dependencies> <!‐‐ 导入Eureka服务的依赖 ‐‐> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring‐cloud‐starter‐netflix‐eureka‐client</artifactId> </dependency> <dependency> <groupId>com.squareup.okhttp3</groupId> <artifactId>okhttp</artifactId>
</dependency>
[AppleScript] 纯文本查看 复制代码 <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring‐cloud‐starter‐openfeign</artifactId> </dependency> <dependency> <groupId>com.netflix.feign</groupId> <artifactId>feign‐okhttp</artifactId> <version>8.18.0</version> </dependency> <dependency> <groupId>com.xuecheng</groupId> <artifactId>xc‐service‐api</artifactId> <version>1.0‐SNAPSHOT</version> </dependency> <dependency> <groupId>com.xuecheng</groupId> <artifactId>xc‐framework‐model</artifactId> <version>1.0‐SNAPSHOT</version> </dependency> <dependency> <groupId>com.xuecheng</groupId> <artifactId>xc‐framework‐utils</artifactId> <version>1.0‐SNAPSHOT</version> </dependency> <dependency> <groupId>com.xuecheng</groupId> <artifactId>xc‐framework‐common</artifactId> <version>1.0‐SNAPSHOT</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring‐boot‐starter‐web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql‐connector‐java</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid‐spring‐boot‐starter</artifactId> <version>1.1.10</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis‐spring‐boot‐starter</artifactId> </dependency> <dependency> <groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper‐spring‐boot‐starter</artifactId>
</dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring‐orm</artifactId> <version>${springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring‐boot‐starter‐data‐jpa</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
</dependency>
<dependency>
<groupId>commons‐io</groupId>
<artifactId>commons‐io</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons‐lang3</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring‐boot‐starter‐test</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring‐boot‐starter‐amqp</artifactId>
</dependency> </dependencies>
[AppleScript] 纯文本查看 复制代码 server: port: ${PORT:40600} spring: application:
name: xc‐service‐learning datasource:
druid: url: ${MYSQL_URL:jdbc:mysql://localhost:3306/xc_learning?characterEncoding=utf‐8}
username: root
password: mysql
driverClassName: com.mysql.jdbc.Driver
initialSize: 5 #初始建立连接数量
minIdle: 5 #最小连接数量
maxActive: 20 #最大连接数量
maxWait: 10000 #获取连接最大等待时间，毫秒
testOnBorrow: true #申请连接时检测连接是否有效
testOnReturn: false #归还连接时检测连接是否有效
timeBetweenEvictionRunsMillis: 60000 #配置间隔检测连接是否有效的时间（单位是毫秒）
minEvictableIdleTimeMillis: 300000 #连接在连接池的最小生存时间（毫秒） eureka: client:
registerWithEureka: true #服务注册开关 fetchRegistry: true #服务发现开关
serviceUrl: #Eureka客户端与Eureka服务端进行交互的地址，多个中间用逗号分隔
defaultZone: ${EUREKA_SERVER:http://localhost:50101/eureka/} instance:
prefer‐ip‐address: true #将自己的ip地址注册到Eureka服务中
ip‐address: ${IP_ADDRESS:127.0.0.1}
instance‐id: ${spring.application.name}:${server.port} #指定实例id ribbon:
MaxAutoRetries: 2 #最大重试次数，当Eureka中可以找到服务，但是服务连不上时将会重试，如果eureka中找不 到服务则直接走断路器
MaxAutoRetriesNextServer: 3 #切换实例的重试次数
OkToRetryOnAllOperations: false #对所有操作请求都进行重试，如果是get则可以，如果是post，put等操作 没有实现幂等的情况下是很危险的,所以设置为false ConnectTimeout: 5000 #请求连接的超时时间
ReadTimeout: 6000 #请求处理的超时时间
启动类：
[AppleScript] 纯文本查看 复制代码 @EnableDiscoveryClient @EnableFeignClients @SpringBootApplication @EntityScan("com.xuecheng.framework.domain.learning")//扫描实体类 @ComponentScan(basePackages={"com.xuecheng.api"})//扫描接口 @ComponentScan(basePackages={"com.xuecheng.learning"})//扫描接口 @ComponentScan(basePackages={"com.xuecheng.framework"})//扫描common下的所有类 public class LearningApplication {
public static void main(String[] args) throws Exception {
SpringApplication.run(LearningApplication.class, args);
}
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
return new RestTemplate(new OkHttp3ClientHttpRequestFactory());
} }
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