springcloud学习之路: (三) springcloud集成Zuul网关

server:
  # 服务端口号
  port: 8085
spring:
  application:
    # 服务名称 - 服务之间使用名称进行通讯
    name: service-zuul
eureka:
  client:
    service-url:
      # 填写注册中心服务器地址
      defaultZone: http://localhost:8081/eureka
zuul:
  routes:
    # 设置服务a 路径名称 随便起
    service-a:
      path: /service-a/**
      # 这里写a服务的注册名字
      serviceId: service-objcat-a
    # 设置服务b 路径名称 随便起
    service-b:
      path: /service-b/**
      # 这里写b服务的注册名字
      serviceId: service-objcat-b

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

import javax.servlet.http.HttpServletRequest;

public class TokenFilter extends ZuulFilter {
    /**
     * 过滤器类型 pre表示在请求之前进行逻辑操作
     */
    @Override
    public String filterType() {
        return "pre";
    }

    /**
     * 过滤器执行顺序
     * 当一个请求在同一个阶段存在多个过滤器的时候 过滤器的执行顺序
     */
    @Override
    public int filterOrder() {
        return 0;
    }

    /**
     * 是否开启过滤
     */
    @Override
    public boolean shouldFilter() {
        return true;
    }

    /**
     * 编写过滤器拦截业务逻辑代码
     */
    @Override
    public Object run() {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        String token = request.getParameter("token");
        if (token == null) {
            currentContext.setSendZuulResponse(false);
            currentContext.setResponseBody("token is null");
            currentContext.setResponseStatusCode(401);
        }
        return null;
    }
}

import com.example.servicezuul.filter.TokenFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
// 添加注解声明是注册中心客户端
@EnableEurekaClient
// 开启网管
@EnableZuulProxy
public class ServiceZuulApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServiceZuulApplication.class, args);
    }

    // 实例化tokenfilter,否则网管不生效
    @Bean
    TokenFilter tokenFilter(){
        return new TokenFilter();
    }

}