springcloud第五步：使用Zuul搭建服务接口网关

路由网关(zuul)

什么是网关

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， 类似于nginx转发。

搭建SpringCloud网关

创建工程service-zuul

Maven依赖

创建工程service-zuul

<parent>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-parent</artifactId>

            <version>1.5.2.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-eureka</artifactId>

            </dependency>

            <dependency>

                  <groupId>org.springframework.cloud</groupId>

                  <artifactId>spring-cloud-starter-zuul</artifactId>

            </dependency>

            <dependency>

                  <groupId>org.springframework.boot</groupId>

                  <artifactId>spring-boot-starter-web</artifactId>

            </dependency>

 

            <dependency>

                  <groupId>org.springframework.boot</groupId>

                  <artifactId>spring-boot-starter-test</artifactId>

                  <scope>test</scope>

            </dependency>

      </dependencies>

 

      <dependencyManagement>

            <dependencies>

                  <dependency>

                       <groupId>org.springframework.cloud</groupId>

                       <artifactId>spring-cloud-dependencies</artifactId>

                       <version>Dalston.RC1</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>

 

      <repositories>

            <repository>

                  <id>spring-milestones</id>

                  <name>Spring Milestones</name>

                  <url>https://repo.spring.io/milestone</url>

                  <snapshots>

                       <enabled>false</enabled>

                  </snapshots>

            </repository>

      </repositories>

application.yml配置

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8888/eureka/

server:

  port: 8769

spring:

  application:

    name: service-zuul

zuul:

  routes:

    api-a:

      path: /api-member/**

      service-id: service-member

    api-b:

      path: /api-order/**

      service-id: service-order

发送请求http://127.0.0.1:8769/api-member/getMemberAll

转发到http://127.0.0.1:8762/getMemberAll

开启网关 @EnableZuulProxy

服务过滤

@Component

public class MyFilter extends ZuulFilter {

 

      private static Logger log = LoggerFactory.getLogger(MyFilter.class);

 

      @Override

      public String filterType() {

            return "pre";

      }

 

      @Override

      public int filterOrder() {

            return 0;

      }

 

      public boolean shouldFilter() {

            return true;

      }

 

      public Object run() {

            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) {

                  return 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;

 

      }

}

如果请求参数中没有传入token参数 直接返回报错信息

 

传入token参数可以正常访问请求