springcloud的网关zuul示例

第一步：修改pom.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ck.springcloud</groupId>
    <artifactId>hello-service-api</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.7.RELEASE</version>
        <relativePath/>
    </parent>

  <dependencies>
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-zuul</artifactId>
      </dependency>
      <dependency>
          <groupId>org.springframework.cloud</groupId>
          <artifactId>spring-cloud-starter-eureka-server</artifactId>
      </dependency>
  </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Brixton.SR5</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>


</project>

第二步：修改application.yml配置文件

spring:
  application:
    name: api-gateway
server:
  port: 5555
eureka:
  client:
    serviceUrl:
        defaultZone: http://localhost:1111/eureka/
zuul:
  routes:
    api-a:
      path: /api-a/**
      url: hello-service
    api-b:
      path: /api-b/**
      url: feign-consumer

理论上这样就可以起到路由作用和选择实例的作用了，选择实例是由集成eureka做的，但是如果想在路由之前，
起到通用的过滤作用，必须添加过滤器，代码如下：

package controller;

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

import javax.servlet.http.HttpServletRequest;

public class AccessFilter extends ZuulFilter {
 //过滤的类型，pre代表路由之前
  @Override
    public String filterType() {
        return "pre";
    }
//多个过滤器时过滤器执行的顺序
    @Override
    public int filterOrder() {
        return 0;
    }
//是否执行过滤器
    @Override
    public boolean shouldFilter() {
        return true;
    }
//过滤器的执行逻辑
    @Override
    public Object run() {
        System.out.println("access token start");
        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest httpServletRequest = requestContext.getRequest();
        Object accessToken = httpServletRequest.getParameter("accessToken");
        if(accessToken == null){
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(401);
            return null;
        }
        System.out.println("access token ok");
        return null;
    }
}

测试：
分别请求执行：http://localhost:5555/api-a/hello?accessToken=123和http://localhost:5555/api-a/hello