Sentinel授权规则-自定义异常结果

默认情况下，发生限流、降级、授权拦截时，都会抛出异常到调用方。如果要自定义异常时的返回结果，需要实现BlockExceptionHandler接口：

public class SentinelExceptionHandler implements BlockExceptionHandler { /** * 处理请求被限流、降级、授权拦截时抛出的异常：BlockException */
    public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception; }

 

而BlockException包含很多个子类，分别对应不同的场景：

异常                       说明
FlowException             限流异常
ParamFlowException        热点参数限流的异常
DegradeException          降级异常
AuthorityException        授权规则异常
SystemBlockException      系统规则异常

 

自定义异常结果
我们在order-service中定义类，实现BlockExceptionHandler接口：

@Component public class SentinelExceptionHandler implements BlockExceptionHandler { @Override public void handle(HttpServletRequest request, HttpServletResponse response, BlockException e) throws Exception { String msg = "未知异常"; int status = 429; if (e instanceof FlowException) { msg = "请求被限流了"; } else if (e instanceof ParamFlowException) { msg = "请求被热点参数限流"; } else if (e instanceof DegradeException) { msg = "请求被降级了"; } else if (e instanceof AuthorityException) { msg = "没有权限访问"; status = 401; } response.setContentType("application/json;charset=utf-8"); response.setStatus(status); response.getWriter().println("{\"msg\": " + msg + ", \"status\": " + status + "}"); } }

 

总结
获取请求来源的接口是什么？
RequestOriginParser

处理BlockException的接口是什么？
BlockExceptionHandler