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