第21章

sp11-zuul/src/main/java/cn/tedu/sp11/filter/AccessFilter.java

@@ -0,0 +1,54 @@
+package cn.tedu.sp11.filter;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
+import org.springframework.stereotype.Component;
+
+import com.netflix.zuul.ZuulFilter;
+import com.netflix.zuul.context.RequestContext;
+import com.netflix.zuul.exception.ZuulException;
+import cn.tedu.web.util.JsonResult;
+
+@Component
+public class AccessFilter extends ZuulFilter{
+	@Override
+	public boolean shouldFilter() {
+	    //对指定的serviceid过滤，如果要过滤所有服务，直接返回 true
+
+		RequestContext ctx = RequestContext.getCurrentContext();
+		String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);
+		if(serviceId.equals("item-service")) {
+			return true;
+		}
+		return false;
+	}
+
+	@Override
+	public Object run() throws ZuulException {
+		RequestContext ctx = RequestContext.getCurrentContext();
+		HttpServletRequest req = ctx.getRequest();
+		String token = req.getParameter("token");
+		if (token == null) {
+			//此设置会阻止请求被路由到后台微服务
+			ctx.setSendZuulResponse(false);
+			//向客户端的响应
+			ctx.setResponseStatusCode(200);
+			ctx.setResponseBody(JsonResult.err().code(JsonResult.NOT_LOGIN).toString());
+		}
+		//zuul过滤器返回的数据设计为以后扩展使用，
+		//目前该返回值没有被使用
+		return null;
+	}
+
+	@Override
+	public String filterType() {
+		return FilterConstants.PRE_TYPE;
+	}
+
+	@Override
+	public int filterOrder() {
+	    //该过滤器顺序要 > 5，才能得到 serviceid
+		return FilterConstants.PRE_DECORATION_FILTER_ORDER+1;
+	}
+}