SpringCloud中Zuul网关的使用

一、基本配置

1、创建gateway微服务

2、引入zuul依赖

        <!--引入zuul-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

3、写启动类，并在启动类上添加注解（@EnableZuulProxy）

package cn.itcast;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableZuulProxy
@SpringBootApplication
public class GatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class);
    }
}

4、写配置文件

zuul:
  routes:
  #      path: /user-service/**
  #      url: user-service
  #    服务id：服务的映射路径(默认提供)
  #    zuul默认提供了所有服务的如下的配置，因此下面这句可以不写
    user-service: /user-service/**
#   zuul默认提供了所有服务的如上的配置，如果那个服务不想向外暴露，可用如下配置忽略
  ignored-services:
    - consumer-service

二、自定义过滤器

package cn.itcast.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;


@Component
public class LoginFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return FilterConstants.PRE_DECORATION_FILTER_ORDER - 1;
    }

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

    @Override
    public Object run() throws ZuulException {
        //获取请求上下文
        RequestContext ctx = RequestContext.getCurrentContext();
        //获取request
        HttpServletRequest request = ctx.getRequest();
        //获取请求参数access-token
        String token = request.getParameter("access-token");
        //判断是否存在
        if(StringUtils.isBlank(token)){
            //不存在，未登录，拦截
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(HttpStatus.FORBIDDEN.value());
        }
        return null;
    }
}

三、负载均衡和熔断

配置文件中添加：

ribbon:
  ConnectionTimeout: 500
  ReadTimeout: 2000
hystrix:
  command:
    default:
      execution:
        isolation:
          thread:
            timeoutInMilliseconds: 6000