Java之springcloud Sentinel案例讲解

<!--服务容错 每一个服务 都引入 sentinel 客户端-->																								
<dependency>																																							
    <groupId>com.alibaba.cloud</groupId>																																							
    <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>																																							
</dependency>																																							

#spring:																																							
#  cloud:																																							
    sentinel:																																							
      transport:																																							
        port: 8081 #跟控制台交流的端口，随意指定一个未使用的端口即可																																							
        dashboard: localhost:8080 # 指定控制台服务的地址																																							

FlowException)

@Slf4j																																																				
@Component																																																				
public class BlockExceptionAspect  implements UrlBlockHandler {																																																				
																																																				
    @Override																																																				
    public void blocked(HttpServletRequest httpServletRequest,																																																				
                        HttpServletResponse httpServletResponse, BlockException e) throws IOException {																																																				
																																																				
																																																				
        System.out.println("进入。。。 MyUrlBlockHandler");																																																				
        // 打印日志																																																				R
        log.error(e.getMessage(),e);																																																				
        // 统一返回结果																																																				
        R appResult = null;																																																				
        if (e instanceof FlowException) {																																																				
            appResult = new R(ResponseEnum.FLOW_BLOCK,null);																																																				
        } else if (e instanceof DegradeException) {																																																				
            appResult = new R(ResponseEnum.DEG_BLOCK,null);																																																				
        } else if (e instanceof ParamFlowException) {																																																				
            appResult = new R(ResponseEnum.DEG_BLOCK,null);																																																				
        } else if (e instanceof SystemBlockException) {																																																				
            appResult = new R(ResponseEnum.DEG_BLOCK,null);																																																				
        } else if (e instanceof AuthorityException) {																																																				
            appResult = new R(ResponseEnum.DEG_BLOCK,null);																																																				
        }																																																				
        httpServletResponse.setCharacterEncoding("utf-8");																																																				
        httpServletResponse.setContentType(MediaType.APPLICATION_JSON_UTF8_VALUE);																																																				
																																																				
        httpServletResponse.getWriter().print(JSON.toJSONString(appResult));																																																				
																																																				
    }																																																				
}