（五）SpringCloud代码实战之zuul网关-蒲公英云

本文任务：
1、搭建zuul网关
2、nginx+zuul，可以实现网关集群

本文是在前文搭建的项目基础上构建的：
（一）springcloud实战代码之eureka注册中心
（二）springcloud实战之config配置中心
（三）SpringCloud实战之openfeign服务调用
（四）SpringCloud代码实战之hystrix熔断器

本文新建项目结构：
模块zuulServer-8060，启动类ZuulApplication，配置文件application.yml,过滤器类MyZuulFilter（继承ZuulFilter类）
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一、搭建zuul网关

1.1、引入依赖

zuul网关依赖spring-cloud-starter-netflix-zuul,

<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
  </dependency>

因为在父工程中声明了spring-cloud-dependencies（Hoxton.SR11）所以这里zuul的依赖不用写版本
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其他依赖：

1.2、启动类

启动类上面加注解@EnableZuulProxy
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1.3、zuul过滤器

新建过滤器类：MyZuulFilter，继承ZuulFilter，重写ZuulFilter的四个方法.。
参考：Zuul入门实战(完整版)

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MyZuulFilter.class:

package com.tzq.zuul.filter;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
/** * @Author tangzhiqian * @CreateTime 2021/6/7 14:48 */
@Component
public class MyZuulFilter extends ZuulFilter { 
    @Override
    public String filterType() { 
        return FilterConstants.PRE_TYPE;
    }
    @Override
    public int filterOrder() { 
        return 0;
    }
    @Override
    public boolean shouldFilter() { 
        return true;
    }
    @Override
    public Object run() throws ZuulException { 
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        System.out.println("执行了我的pre类型的zuul过滤器！！！");
        System.out.println("request.getMethod() = " + request.getMethod());
        System.out.println("request.getRequestURL() = " + request.getRequestURL());
        System.out.println("request.getRequestURI() = " + request.getRequestURI());
        System.out.println("request.getContextPath() = " + request.getContextPath());
        System.out.println("request.getCookies() = " + request.getCookies());
        return null;
    }
}

1.4、配置文件

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到这里，zuul网关已经搭建完成！
启动：注册中心，配置中心，stundent-service，zuulServer
打开浏览器：访问http://localhost:8060/mypath/student/selectAll
（zuulServer在8060端口跑）
转发成功：

与此同时，控制台输出：

说明过滤器也生效了！

二、nginx+zuul

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2.1、安装nginx（此处是window版）

下载地址：http://nginx.org/en/download.html
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解压后，一定要用cmd启动nginx！！！！！

启动是没有任何反应的，打开浏览器：http://localhost:80
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说明安装成功。

2.2、配置nginx

在刚刚解压的nginx文件夹中：conf文件夹—>nginx.conf文件
其中weight表示权重，谁的权重大访问到的几率就大（多个服务权重可相同）
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nginx.conf文件：

#user  nobody;
worker_processes  1;
#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;
#pid        logs/nginx.pid;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';
    #access_log  logs/access.log  main;
    sendfile        on;
    #tcp_nopush     on;
    #keepalive_timeout  0;
    keepalive_timeout  65;
    #gzip  on;
    server {
        listen       80;
        server_name  localhost;
        #charset koi8-r;
        #access_log  logs/host.access.log  main;
        location / {
            root   html;
            index  index.html index.htm;
        }
        #error_page  404              /404.html;
        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}
        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}
        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }
    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;
    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;
    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;
    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;
    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}
    #配置上游服务器网关端口集群
    upstream  zuulServer{
        server 127.0.0.1:8060 weight=1;
    }
    server {
        listen       80;
        server_name  www.tzq.com;
        location / {
           ### 指定上游服务器负载均衡服务器
            proxy_pass http://zuulServer/; 
             index  index.html index.htm;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}