springcloud(二)

springcloud路由网关

一、什么是网关

　　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SpringCloud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