springCloud Zuul网关

1.springboot 仅2.0.x 支持，在此选择 2.0.7

2.新建Module eureka-zuul-client

3.导入依赖

<?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>
    <parent>
        <groupId>com.hc</groupId>
        <artifactId>demoparent</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <artifactId>eureka-zuul-client</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 引入关于 eureka-server的依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <!--引入网关 zuul依赖-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <!--运行状态监控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--mybatis配置 start-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.2.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.39</version>
        </dependency>
        <!--mybatis配置 end-->
    </dependencies>
</project>

4.启动类加上注解

@EnableEurekaClient
@EnableZuulProxy

5.增加配置文件application.yml

server:
  port: 8767
spring:
  main:
    allow-bean-definition-overriding: true
  datasource:
    url: jdbc:mysql://192.168.9.1:3306/test1?useUnicode=true&characterEncoding=utf8
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
  application:
    name: eureka-zuul-client
eureka:
  client:
    #改变eureka server的检查方式，使用actuator 的health进行检查，可能会检查到数据库
    healthcheck:
      enabled: true
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true
    instanceId: ${spring.application.name}:${server.port}
    # 每隔10s发送一次心跳
    lease-renewal-interval-in-seconds: 10
    # 告知服务端30秒还未收到心跳的话，就将该服务移除列表
    lease-expiration-duration-in-seconds: 30
    #改变eureka 服务端的 status 状态跳转查看页面
    status-page-url-path: /actuator/health
management:
  endpoints:
    web:
      exposure:
        include: "*"
  server:
    port: 10116
    servlet:
      context-path: /
    ssl:
      enabled: false
  endpoint:
    health:
      show-details: always
zuul:
  routes:
    zuulHello:
      path: /zuulHello/**
      serviceId: eureka-client
    ribbonHello:
      path: /ribbonHello/**
      serviceId: eureka-ribbon-client
    feignHello:
      path: /feignHello/**
      serviceId: eureka-feign-client
  prefix: /v1

6.增加zuul熔断器

代码：

package com.example.eurekazuulclient.hystrixList;

import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class MyFallbackProvider implements FallbackProvider {
    @Override
    public String getRoute() {
        //return "eureka-client";
        return "*";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return 200;
            }

            @Override
            public String getStatusText() throws IOException {
                return "OK";
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                return new ByteArrayInputStream("fallback".getBytes());
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                return headers;
            }
        };
    }
}//end

7.增加zuul 过滤器

pre

package com.example.eurekazuulclient.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class MyFilter_pre extends ZuulFilter {
    @Override
    public String filterType() {
        /**
         * pre 代表请求被路由前执行
         */
        return "pre";
    }

    @Override
    public int filterOrder() {
        /**
         * 过滤器执行的顺序 越小越靠前
         */
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        /**
         * 判断过滤器是否执行
         */
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        System.out.println("pre send " + request.getMethod() + " Request to " + request.getRequestURL().toString());
        //int i = 1 / 0;
        String token = request.getParameter("token");
        if (StringUtils.isBlank(token)) {
            System.out.println("access token is empty");
            currentContext.setSendZuulResponse(false);
            currentContext.setResponseStatusCode(401);
            try {
                HttpServletResponse response = currentContext.getResponse();
                response.setCharacterEncoding("utf-8");  //设置字符集
                response.setContentType("text/html; charset=utf-8"); //设置相应格式
                response.getWriter().write("token 验证失败");
            } catch (IOException e) {
                System.out.println("response io异常");
                e.printStackTrace();
            }
            return null;
        }
        return null;
    }
}//end

post

package com.example.eurekazuulclient.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;

@Component
public class MyFilter_post extends ZuulFilter {
    @Override
    public String filterType() {
        /**
         * post 它是在请求己被路由到微服务后执行的 般情况下，用作收集统计
         * 信息、指标，以及将响应传输到客户端
         */
        return "post";
    }

    @Override
    public int filterOrder() {
        /**
         * 过滤器执行的顺序 越小越靠前
         */
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        /**
         * 判断过滤器是否执行
         */
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        System.out.println("post send " + request.getMethod() + " Request to " + request.getRequestURL().toString());
        return null;
    }
}//end

error

package com.example.eurekazuulclient.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 javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class MyFilter_error extends ZuulFilter {
    @Override
    public String filterType() {
        /**
         * error 在其他过滤器发生错误时执行
         */
        return "error";
    }

    @Override
    public int filterOrder() {
        /**
         * 过滤器执行的顺序 越小越靠前
         */
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        /**
         * 判断过滤器是否执行
         */
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        System.out.println("error send " + request.getMethod() + " Request to " + request.getRequestURL().toString());
        try {
            HttpServletResponse response = currentContext.getResponse();
            response.setCharacterEncoding("utf-8");  //设置字符集
            response.setContentType("text/html; charset=utf-8"); //设置相应格式
            response.getWriter().write("error 验证失败");
        } catch (IOException e) {
            System.out.println("response io异常");
            e.printStackTrace();
        }
        return null;
    }
}//end

routing

package com.example.eurekazuulclient.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;

@Component
public class MyFilter_routing extends ZuulFilter {
    @Override
    public String filterType() {
        /**
         * routing 它用于将请求路由到具体的微服务实例。在默认情况下，它使用
         * Http Client 进行网络请求。
         */
        return "routing";
    }

    @Override
    public int filterOrder() {
        /**
         * 过滤器执行的顺序 越小越靠前
         */
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        /**
         * 判断过滤器是否执行
         */
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        System.out.println("routing send " + request.getMethod() + " Request to " + request.getRequestURL().toString());
        return null;
    }
}//end

7.依次启动，eureka-server  eureka-client-01  eureka-client  eureka-feign-client  eureka-ribbon-client  eureka-zuul-client

访问 http://192.168.9.6:8767/v1/zuulHello/hello?token=123 显示

访问 http://192.168.9.6:8767/v1/ribbonHello/hello?token=123 显示

访问 http://192.168.9.6:8767/v1/feignHello/hello 显示