springcloud(二)

Zuul的主要功能是路由转发和过滤器。路由功能是微服务的一部分，比如／api/user转发到到user服务，/api/shop转发到到shop服务。zuul默认和Ribbon结合实现了负载均衡的功能， 类似于nginx转发。

二、搭建S pringCloud网关

2.1 创建 工程service-zuul 目录展示

2.2 导入依赖

<!--eureka依赖-->

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

    </dependency>

    <dependency>

      <groupId>org.springframework.cloud</groupId>

      <artifactId>spring-cloud-starter-netflix-zuul</artifactId>

    </dependency>

  <dependencyManagement>

    <dependencies>

      <!--springCloud依赖-->

      <dependency>

        <groupId>org.springframework.cloud</groupId>

        <artifactId>spring-cloud-dependencies</artifactId>

        <version>Greenwich.RELEASE</version>

        <type>pom</type>

        <scope>import</scope>

      </dependency>

    </dependencies>

  </dependencyManagement>

2.3 application.yml配置文件

2.4 StartSpringCloudZuul启动类

package com.zn;

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;

@EnableEurekaClient

@SpringBootApplication

@EnableZuulProxy

public class StartSpringCloudZuul {

    public static void main(String[] args) {

        SpringApplication.run(StartSpringCloudZuul.class,args);

    }

}

2.5 效果展示

SpringCloud服务过滤filter

一、目录展示

二、application.yml配置文件

三、MyZuulFilter

package com.zn.filter;

import com.netflix.zuul.ZuulFilter;

import com.netflix.zuul.context.RequestContext;

import com.netflix.zuul.exception.ZuulException;

import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

import java.io.IOException;

@Component

public class MyZuulFilter extends ZuulFilter {

    /**

     * 过滤类型

     * @return

     */

    @Override

    public String filterType() {

        return "pre";

    }

    /**

     * 请求过滤顺序

     * @return

     */

    @Override

    public int filterOrder() {

        return 0;

    }

    @Override

    public boolean shouldFilter() {

        return true;

    }

    @Override

    public Object run() throws ZuulException {

        //获取token参数

        RequestContext rc = RequestContext.getCurrentContext();

        HttpServletRequest request = rc.getRequest();

        String token = request.getParameter("token");

        if (token!=null){

            return null;

        }

        //表示不进行路由

        rc.setSendZuulResponse(false);

        rc.setResponseStatusCode(401);

        rc.getResponse().setContentType("text/html;charset=utf-8");

        try {

            rc.getResponse().getWriter().write("没有传递正确参数，请校验后重试！");

        } catch (IOException e) {

            e.printStackTrace();

        }

        return null;

    }

}

四、StartSpringCloudZuul启动类

package com.zn;

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;

@EnableEurekaClient

@SpringBootApplication

@EnableZuulProxy

public class StartSpringCloudZuul {

    public static void main(String[] args) {

        SpringApplication.run(StartSpringCloudZuul.class,args);

    }

}

五、效果展示