上篇文章已經介紹了，zuul基本的搭建，這篇文章 介紹一下自定義 Filter

首先 在 Zuul 模組中 新增加 兩個java 類

zuul1Filter 內容如下：

package com.springcloud.zuul.filter;

import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
 * Created by joe強 on 2018/9/27 17:26
 */

@Component
public class Zuul1Filter extends com.netflix.zuul.ZuulFilter {
    @Override
    public String filterType() {
        return "pre";  //filterType: 表示過濾型別 列舉值:pre 表示路由之前,routing表示路由當中,post表示路由之後,error 表示路由發生錯誤
    }

    @Override
    public int filterOrder() {
        return 1;
    } //優先順序,0是最高優先順序即最先執行

    @Override
    public boolean shouldFilter() {
        return true;  //寫邏輯,是否要執行過濾。true會執行run函式,false不會執行
    }

    @Override
    public Object run() throws ZuulException {
        System.out.println("\"----------------this is DemoFilter----------\"");
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        System.out.println(String.format("%s %s", request.getMethod(), request.getRequestURL().toString()));
        Object accessToken = request.getParameter("token");
        if (accessToken == null) {    //判斷釋放有token自動            logger.warn("token is empty");            ctx.setSendZuulResponse(false);            ctx.setResponseStatusCode(401);            try {                ctx.getResponse().getWriter().write("token is empty");            }catch (Exception e){}             return null;        }        return null;    }
            System.out.println("token is empty");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("token is empty");
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

            return null;
        }
        return null;
    }
}
 

 zuul2Filter 內容：

package com.springcloud.zuul.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.stereotype.Component;

/**
 * Created by joe強 on 2018/9/27 17:33
 */
@Component
public class Zuul21Filter extends ZuulFilter {

    @Override
    public String filterType() {
        return "pre";
    }

    @Override
    public int filterOrder() {
        return 0; //優先順序,0是最高優先順序 即最高執行
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        System.out.println("執行 Zuul2Filter");
        return "this is Zuul2Filter";
    }
}
 

啟動 Euaeka 註冊中心，server1服務 和當前Zuul 閘道器

呼叫介面：

說明自定義過濾器已經生效了！

看下控制檯輸出

可以看的出來 優先順序也生效了！