1.自定义注解类

@Target(ElementType.METHOD)@Retention(RetentionPolicy.RUNTIME)public @interface Trace {    String businessName() default "";}

2.在需要拦截的方法上加自定义注解

@Trace(businessName = "线上复核扫描出库单号")@Token@RequestMapping(value = "/mst-obd-review/checkorderno", method = {RequestMethod.POST, RequestMethod.GET})public RespJson checkorderno(@RequestParam("orderNo") String orderNo,HttpServletRequest request) {...

3.自定义拦截器

public class RpcTraceInterceptor extends HandlerInterceptorAdapter {    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        TraceContext traceContext = (TraceContext) TraceContext.ctx.get();        //清除traceid        traceContext.clear();        //重新生成traceid        MDC.put("traceId", traceContext.getTraceId());        return super.preHandle(request, response, handler);    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {        //请求结束情况traceid        MDC.remove("traceId");        super.afterCompletion(request, response, handler, ex);    }}

public class TraceContext {    public static ThreadLocal ctx = new InheritableThreadLocal() { //此处用InheritableThreadLocal保证可以在子线程得到相同的traceId        @Override        protected TraceContext initialValue() {            return new TraceContext();        }    };    private String traceId;    public String getTraceId() {        if (traceId == null || "".equals(traceId)) {            int hashCodeV = UUID.randomUUID().toString().hashCode();            if (hashCodeV < 0) {//有可能是负数                hashCodeV = -hashCodeV;            }            // 0 代表前面补充0            // 4 代表长度为4            // d 代表参数为正数型            traceId = String.format("%012d", hashCodeV);        }        return traceId;    }    public void clear() {        traceId = null;    }}