首先 在配置文件 开启熔断器
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/jpa?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.application.name=eureka-student
server.port=8091
eureka.client.serviceUrl.defaultZone=http://localhost:8080/eureka/
#开启熔断器
feign.hystrix.enabled=true
新建一个service的GradeClientImpl实现类
@Component
public class GradeClientImpl implements GradeClient {
@Override
public List<Grade> findStudents() {
List<Grade> list = new ArrayList<>();
Grade grade = new Grade();
grade.setGradeId(0);
grade.setGradeName("出错了 执行了熔断器");
list.add(grade);
return list;
}
}
这时我们如果在grade项目关闭情况下 访问grades方法 就会出现:
完毕!!!!