zuul 动态网关路由

版权声明：Copyright ©2018-2019 凉白开不加冰 版权所有 https://blog.csdn.net/qq_21082615/article/details/91371252

介绍： zuul的主要功能是路由和过滤器。

第一步：pom加入依赖包

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
   <groupId>com.marcosbarbero.cloud</groupId>
   <artifactId>spring-cloud-zuul-ratelimit</artifactId>
</dependency>
<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-zuul</artifactId>
   <version>1.4.2.RELEASE</version>
</dependency>
<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
</dependency>

第二步：zuul初始配置类

import com.example.route.ZuulRouteLocator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.cloud.netflix.zuul.filters.ZuulProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 路由初始化
 **/
@Configuration
public class ZuulConfig {

    @Autowired
    private ZuulProperties zuulProperties;
    @Autowired
    private ServerProperties server;

    @Bean
    public ZuulRouteLocator routeLocator() {
        ZuulRouteLocator routeLocator = new ZuulRouteLocator(server.getServlet().getServletPrefix(), this.zuulProperties);
        return routeLocator;
    }

}

第三步：动态路由类

import com.example.constant.ZuulRouteEnum;
import com.example.pojo.vo.ZuulRouteVO;
import com.example.tools.RedisTools;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.netflix.zuul.filters.RefreshableRouteLocator;
import org.springframework.cloud.netflix.zuul.filters.SimpleRouteLocator;
import org.springframework.cloud.netflix.zuul.filters.ZuulProperties;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.StringUtils;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 动态路由
 **/
@Slf4j
public class ZuulRouteLocator extends SimpleRouteLocator implements RefreshableRouteLocator {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    private ZuulProperties properties;

    public ZuulRouteLocator(String servletPath, ZuulProperties properties) {
        super(servletPath, properties);
        this.properties = properties;
        log.info("servletPath:{}", servletPath);
    }


    @Override
    public void refresh() {
        doRefresh();
    }

    @Override
    protected Map<String, ZuulProperties.ZuulRoute> locateRoutes() {
        LinkedHashMap<String, ZuulProperties.ZuulRoute> routesMap = new LinkedHashMap<>();
        //从application.properties中加载路由信息
        routesMap.putAll(super.locateRoutes());
        //从redis中加载路由信息
        routesMap.putAll(locateRoutesFromRedis());
        log.info("网关路由配置 --> {}", routesMap);
        //优化一下配置
        LinkedHashMap<String, ZuulProperties.ZuulRoute> values = new LinkedHashMap<>();
        for (Map.Entry<String, ZuulProperties.ZuulRoute> entry : routesMap.entrySet()) {
            String path = entry.getKey();
            if (!path.startsWith("/")) {
                path = "/" + path;
            }
            if (StringUtils.hasText(this.properties.getPrefix())) {
                path = this.properties.getPrefix() + path;
                if (!path.startsWith("/")) {
                    path = "/" + path;
                }
            }
            values.put(path, entry.getValue());
        }
        return values;
    }

    /**
     * @Author: 凉白开不加冰
     * @Date: 2018/7/23 18:14
     * @Description: 从redis获取路由信息
     **/
    private Map<String, ZuulProperties.ZuulRoute> locateRoutesFromRedis() {
        Map<String, ZuulProperties.ZuulRoute> routes = new LinkedHashMap<>();
        List<ZuulRouteVO> results = RedisTools.hget(stringRedisTemplate,ZuulRouteEnum.ZUUL_ROUTE_LIST.getKey(), ZuulRouteVO.class);
        if(results==null){
            return routes;
        }
        for (ZuulRouteVO result : results) {
            if (StringUtils.isEmpty(result.getPath())) {
                continue;
            }
            if (!result.getEnabled()) {
                continue;
            }
            ZuulProperties.ZuulRoute zuulRoute = new ZuulProperties.ZuulRoute();
            try {
                BeanUtils.copyProperties(result, zuulRoute);
            } catch (Exception e) {
                log.error("=============加载网关路由失败==============", e);
            }
            routes.put(zuulRoute.getPath(), zuulRoute);
        }
        return routes;
    }

}

路由限流枚举

import lombok.Getter;
import lombok.Setter;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 路由限流枚举
 **/
public enum ZuulRouteEnum {

    /**
     * 路由枚举
     */
    ZUUL_ROUTE_LIST("zuul:route:list");

    @Getter
    @Setter
    private String key;

    ZuulRouteEnum(String key) {
        this.key = key;
    }

    public static ZuulRouteEnum get(String key) {
        for (ZuulRouteEnum c : ZuulRouteEnum.values()) {
            if (c.key == key) {
                return c;
            }
        }
        return null;
    }
}

路由参数

import lombok.Data;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 路由参数
 **/
@Data
public class ZuulRouteVO {
    /**
     * id主键
     */
    private String id;

    /**
     * 网关路由访问地址
     */
    private String path;

    /**
     * 服务地址
    **/
    private String url;

    /**
     * 服务id
     */
    private String serviceId;

    /**
     * 是否启用 true启用 false不启用
     */
    private Boolean enabled;

}

redis工具类

import com.alibaba.fastjson.JSON;
import org.springframework.data.redis.core.StringRedisTemplate;

import java.util.List;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/11/20
 * @Description: redis工具类
 **/
public class RedisTools {

    public static <T> List<T> hget(StringRedisTemplate stringRedisTemplate,String key,Class<T> clazz){
        List<Object> list = stringRedisTemplate.opsForHash().values(key);
        return JSON.parseArray(list.toString(), clazz);
    }

    public static void hset(StringRedisTemplate stringRedisTemplate,String h,String key,String value){
        stringRedisTemplate.opsForHash().put(h,key,value);
    }

    public static Boolean existsHash(StringRedisTemplate stringRedisTemplate,String h,String key){
        return stringRedisTemplate.opsForHash().hasKey(h,key);
    }

}

服务启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableZuulProxy
@EnableDiscoveryClient
@SpringBootApplication
public class MicromserviceZuulApplication {

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

路由刷新接口

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 刷新路由
 **/
public interface RefreshRouteService {
    /**
     * @Author: 胡成
     * @Date: 2018/7/23 16:35
     * @Description: 刷新路由
     **/
    void refreshRoute();
}

路由刷新实现类

import com.example.service.RefreshRouteService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.netflix.zuul.RoutesRefreshedEvent;
import org.springframework.cloud.netflix.zuul.filters.RouteLocator;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.stereotype.Service;

/**
 * @Author: 凉白开不加冰
 * @Version: 0.0.1V
 * @Date: 2018/7/23
 * @Description: 路由刷新业务
 **/
@Service
public class RefreshRouteServiceImpl implements RefreshRouteService {

    @Autowired
    private ApplicationEventPublisher publisher;

    @Autowired
    private RouteLocator routeLocator;

    @Override
    public void refreshRoute() {
        RoutesRefreshedEvent routesRefreshedEvent = new RoutesRefreshedEvent(routeLocator);
        publisher.publishEvent(routesRefreshedEvent);
    }
}

第五步：redis中存放路由信息

{
   "id": "test",
   "serviceId": "",
   "path": "/order/**",
   "url": "http://192.168.0.111:9092",
   "enabled": true
}