【前面的话】书接上文，前面已经讲过了SpringCloud的注册中心Eureka、Ribbon和Feign等等，如果有不清楚的也可以去看看我的微服务系列文章。这篇文章我要说的是微服务中的网关。

壹、Zuul的简介

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。

zuul有以下功能：

Authentication
Insights
Stress Testing
Canary Testing
Dynamic Routing
Service Migration
Load Shedding
Security
Static Response handling
Active/Active traffic management

贰、准备工作

新建一个feign子工程lovin-cloud-zuul，用于后面的操作。下面是主要的pom依赖:

<parent>
        <artifactId>lovincloud</artifactId>
        <groupId>com.eelve.lovincloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>lovin-cloud-zuul</artifactId>
    <packaging>jar</packaging>
    <name>lovincloudzuul</name>
    <version>0.0.1</version>
    <description>zuul</description>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
            <version>1.4.7.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

这里为了安全，我这里还是添加spring-boot-starter-security，同时配置路由规则发送/api-ribbon/打头开始的服务转发到lovinribbonclient而发送/api-feign/打头的服务转发到lovinfeignclient，可以看出这里是配置相应的路由规则。

server: port: 8882 # 服务端口号 spring: application: name: lovincloudzuul # 服务名称 security: basic: enabled: true user: name: lovin password: ${REGISTRY_SERVER_PASSWORD:lovin} zuul: routes: api-ribbon: path: /api-ribbon/** serviceId: lovinribbonclient api-feign: path: /api-feign/** serviceId: lovinfeignclient eureka: client: serviceUrl: defaultZone: http://lovin:lovin[@localhost](https://my.oschina.net/u/570656):8881/eureka/ # 注册到的eureka服务地址 instance: leaseRenewalIntervalInSeconds: 10 health-check-url-path: /actuator/health metadata-map: user.name: lovin user.password: lovin
配置spring-boot-starter-security，这里为了方便我这里放开所有请求

package com.eelve.lovin.config;

import org.springframework.context.annotation.Configuration; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

/**
- @ClassName WebSecurityConfig
- @Description TDO
- @Author zhao.zhilue
- @Date 2019/8/18 12:17
- @Version 1.0
**/ @Configuration public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
```
@Override
protected void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests().anyRequest().permitAll()
            .and().csrf().disable();
}
```
}
在主类上添加**@EnableZuulProxy** ，当然也需要注册到注册中心：

package com.eelve.lovin;

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;

/**
- @ClassName LovinEurekaClientApplication
- @Description TDO
- @Author zhao.zhilue
- @Date 2019/8/15 16:37
- @Version 1.0
**/ @EnableZuulProxy @EnableEurekaClient @SpringBootApplication public class LovinCloudZuulApplication { public static void main(String[] args) { SpringApplication.run(LovinCloudZuulApplication.class,args); } }

这里为了方便测试，这里配置相应的过滤规则：

package com.eelve.lovin.filter;

import com.netflix.zuul.ZuulFilter; import com.netflix.zuul.context.RequestContext; import com.netflix.zuul.exception.ZuulException; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Value; import org.springframework.cloud.context.config.annotation.RefreshScope; import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**

@ClassName MyFilter
@Description TDO
@Author zhao.zhilue
@Date 2019/8/18 12:44
@Version 1.0

**/ @Component @RefreshScope // 使用该注解的类，会在接到SpringCloud配置中心配置刷新的时候，自动将新的配置更新到该类对应的字段中。 @Slf4j public class MyFilter extends ZuulFilter {

@Override
public String filterType() {
    return "pre";
}

@Override
public int filterOrder() {
    return 0;
}

@Override
public boolean shouldFilter() {
    return true;
}

@Override
public Object run() throws ZuulException {
    RequestContext ctx = RequestContext.getCurrentContext();
    HttpServletRequest request = ctx.getRequest();
    log.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));
    Object accessToken = request.getParameter("token");
    if(accessToken == null) {
        log.warn("token is empty");
        ctx.setSendZuulResponse(false);
        ctx.setResponseStatusCode(401);
        try {
            ctx.getResponse().getWriter().write("token is empty");
        }catch (Exception e){}

        return null;
    }else if(!accessToken.equals("lovin")){
        log.warn("token is not correct");
        ctx.setSendZuulResponse(false);
        ctx.setResponseStatusCode(403);
        try {
            ctx.getResponse().getWriter().write("token is not correct");
        }catch (Exception e){}

        return null;
    }
    log.info("ok");
    return null;
}

}

filterType：返回一个字符串代表过滤器的类型，在zuul中定义了四种不同生命周期的过滤器类型，具体如下：
    pre：路由之前
    routing：路由之时
    post： 路由之后
    error：发送错误调用
filterOrder：过滤的顺序
shouldFilter：这里可以写逻辑判断，是否要过滤，本文true,永远过滤。
run：过滤器的具体逻辑。可用很复杂，包括查sql，nosql去判断该请求到底有没有权限访问。