<?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>qinfeng.zheng</groupId>
  <artifactId>springcloud-zuul-ha</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>springcloud-zuul-ha</name>
  <description>Demo project for Spring Boot</description>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>

  <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</artifactId>
    </dependency>

  </dependencies>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <!--Dalston.RC1這個(gè)高版本的zuul依賴有問題-->
        <version>Brixton.SR7</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

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

###服務(wù)注冊地址
eureka:
 client:
  serviceUrl:
   defaultZone: http://localhost:8763/eureka/
###api網(wǎng)關(guān)端口號(hào)
server:
 port: 82
###網(wǎng)關(guān)名稱
spring:
 application:
  name: service-zuul

zuul:
 routes:
 ###定義轉(zhuǎn)發(fā)服務(wù)規(guī)則
  api-a:
   path: /api-hello/**  #請求路徑中含有api-hello,都會(huì)轉(zhuǎn)發(fā)到hello-service服務(wù)
   ###服務(wù)別名 zuul網(wǎng)關(guān)默認(rèn)整合ribbon 自動(dòng)實(shí)現(xiàn)負(fù)載均衡輪訓(xùn)效果
   serviceId: hello-service

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

/**
* 創(chuàng)建時(shí)間: 16:07 2018/7/16
* 修改時(shí)間:
* 編碼人員: ZhengQf
* 版 本: 0.0.1
* 功能描述: 自定義一個(gè)Zuul Filter,它在請求路由之前進(jìn)行過濾
*
* 補(bǔ): zuul兩大功能: 1.路由請求
* 2.過濾
*/
@Component
public class AccessFilter extends ZuulFilter {

　　@Value("${server.port}")
　　private String serverPort;

/**
* 過濾器的類型,它決定過濾器在請求的哪個(gè)生命周期中執(zhí)行,
* pre:請求被路由之前做一些前置工作 ,比如請求和校驗(yàn)
* routing : 在路由請求時(shí)被調(diào)用,路由請求轉(zhuǎn)發(fā),即是將請求轉(zhuǎn)發(fā)到具體的服務(wù)實(shí)例上去.
* post : 在routing 和 error過濾器之后被調(diào)用..所以post類型的過濾器可以對請求結(jié)果進(jìn)行一些加工
* error :處理請求發(fā)生錯(cuò)誤時(shí)調(diào)用
*/
　　@Override
　　public String filterType() {

　　　　return "pre"; //
　　}

/**
*過濾器的執(zhí)行順序.
*在一個(gè)階段有多個(gè)過濾器時(shí),需要用此指定過濾順序
* 數(shù)值越小優(yōu)先級(jí)越高
*/
　　@Override
　　public int filterOrder() {
　　　　return 0;
　　}

/**
* 判斷過濾器是否執(zhí)行,直接返回true,代表對所有請求過濾
* 此方法指定過濾范圍
* @return
*/
　　@Override
　　public boolean shouldFilter() {
　　　　return true;
　　}

/**
* 過濾的具體邏輯
* @return
*/
　　@Override
　　public Object run() {

 

　　// 1.獲取上下文
　　RequestContext currentContext = RequestContext.getCurrentContext();
　　// 2.獲取 Request
　　HttpServletRequest request = currentContext.getRequest();
　　// 3.獲取token 的時(shí)候 從請求頭中獲取
　　String token = request.getParameter("token");
　　request.setAttribute("serverPort", serverPort);
　　if (StringUtils.isEmpty(token)) {
  　　// 不會(huì)繼續(xù)執(zhí)行... 不會(huì)去調(diào)用服務(wù)接口，網(wǎng)關(guān)服務(wù)直接響應(yīng)給客戶端
  　　currentContext.setSendZuulResponse(false);
  　　currentContext.setResponseBody("token is null");
  　　currentContext.setResponseStatusCode(401);
  　　return null;
  　　// 返回一個(gè)錯(cuò)誤提示
　　}
　　// 正常執(zhí)行調(diào)用其他服務(wù)接口...
　　System.out.println("網(wǎng)關(guān)執(zhí)行端口號(hào):" + serverPort);
　　return null;
　　}

}

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;

@EnableZuulProxy
@EnableEurekaClient
@SpringBootApplication
public class SpringcloudZuulHaApplication {

  public static void main(String[] args) {
    SpringApplication.run(SpringcloudZuulHaApplication.class, args);
  }
}

   upstream backServer{
    server 127.0.0.1:81;
    server 127.0.0.1:82;
  }
  
  server {
    listen    80;
    server_name qinfeng.zheng.com;

    location / {
      ### 指定上游服務(wù)器負(fù)載均衡服務(wù)器
      proxy_pass http://backServer/;
      index index.html index.htm;
    }
  }