Idea下SpringCloud2实验（四、Zuul网关实现路由转发和过滤）

一、创建springBoot项目springcloud-zuul-server项目

二、配置文件

1、pom.xml文件

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.4.RELEASE
         
    
    com.jane
    springcloud-zuul-server
    0.0.1-SNAPSHOT
    springcloud-zuul-server
    Demo project for Spring Boot

    
        1.8
        Greenwich.SR1
    

    
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-zuul
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

2、启动文件

package com.jane.springcloudzuulserver;

import com.jane.springcloudzuulserver.filter.TokenFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@EnableDiscoveryClient
@EnableZuulProxy
public class SpringcloudZuulServerApplication {

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

    //将过滤器在spring生成
    @Bean
    public TokenFilter tokenFilter() {
        return new TokenFilter();
    }

}

3、application.properties

server.port=6030
spring.application.name=zuul-gateway
eureka.client.serviceUrl.defaultZone=http://127.0.0.1:6001/eureka/
zuul.routes.springcloud-eureka-customer.path=/springcloud-eureka-customer/**

4、过滤器TokenFilter

package com.jane.springcloudzuulserver.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;

import javax.servlet.http.HttpServletRequest;

public class TokenFilter extends ZuulFilter {

    //pre：主要用在路由映射的阶段是寻找路由映射表的
    //routing:具体的路由转发过滤器是在routing路由器，具体的请求转发的时候会调用
    //error:一旦前面的过滤器出错了，会调用error过滤器。
    //post:当routing，error运行完后才会调用该过滤器，是在最后阶段的
    @Override
    public String filterType() {
        return "pre";
    }

    //自定义过滤器执行的顺序，数值越大越靠后执行，越小就越先执行
    @Override
    public int filterOrder() {
        return 0;
    }

    //控制过滤器生效不生效，可以在里面写一串逻辑来控制,true是生效
    @Override
    public boolean shouldFilter() {
        return true;
    }

    //执行过滤逻辑
    @Override
    public Object run() throws ZuulException {
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        //如果有授权服务器，这里可以做统一登陆授权校验
        String token = request.getParameter("token");
        if(token == null) {
            context.setSendZuulResponse(false);
            context.setResponseStatusCode(401);
            context.setResponseBody("no token , Auth deny");
        }
        return null;
    }
}

三、启动文件，结合之前的文章 注册中心 服务提供者 服务消费，全部启动
1、服务如下图：

2、访问结果如下

没有token的请求：

有token的请求：