springCloud的使用05-----路由网关(zuul)
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zuul的主要功能是路由转发和过滤,比如让所有/api-a/*的请求都转发到服务器a上,所有/api-b/*的请求都转发到服务器b上,zuul默认和ribbon结合实现了负载均衡的功能。
1 zuul的路由转发
1.1 创建springboot项目,引入相关依赖
<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>com.beifeng.hadoop</groupId> <artifactId>beifeng-spring-cloud-zuul</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>beifeng-spring-cloud-zuul</name> <url>http://maven.apache.org</url> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.RELEASE</version> <relativePath /> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 声明为web项目 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 配置eureka --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka</artifactId> </dependency> <!-- 配置zuul --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-zuul</artifactId> </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> <repositories> <repository> <id>spring-milestones</id> <name>Spring Milestones</name> <url>https://repo.spring.io/milestone</url> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>
1.2 在配置文件中配置路由转发策略
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/ #注册服务器地址
server:
port: 8766
spring:
application:
name: cloud-zuul
zuul:
routes:
api-a:
path: /api-a/** #所有的/api-a开头的请求都转发到cloud-consumer-ribbon服务器上
serviceId: cloud-consumer-ribbon
api-b:
path: /api-b/** #所有的/api-b开头的请求都转发到cloud-consumer-feign服务器上
serviceId: cloud-consumer-feign
1.3 在启动类中声明启用zuul
@SpringBootApplication @EnableZuulProxy @EnableEurekaClient public class CloudZuul { public static void main(String[] args) { SpringApplication.run(CloudZuul.class, args); } }
1.4 启动查看结果
依次启动eureka-server、eureka-client、cloud-consumer-ribbon、cloud-consumer-feign、cloud-zuul项目
2 路由的过滤
2.1 创建自定义的路由过滤器,指定要过滤的请求和如何过滤
@Component public class MyZuulFilter extends ZuulFilter { Logger logger=LoggerFactory.getLogger(MyZuulFilter.class); //过滤器的具体逻辑 public Object run() { RequestContext context=RequestContext.getCurrentContext(); HttpServletRequest request=context.getRequest(); logger.info("url:"+request.getRequestURL().toString()); Object token=request.getParameter("token"); if (token==null||StringUtils.isEmpty(token.toString())) { logger.info("token is empty"); context.setSendZuulResponse(false); context.setResponseStatusCode(401); try { context.getResponse().getWriter().write("token is empty"); } catch (IOException e) { e.printStackTrace(); } return null; } logger.info("ok"); return null; } //是否要过滤,可以写逻辑判断 public boolean shouldFilter() { RequestContext context=RequestContext.getCurrentContext(); HttpServletRequest request=context.getRequest(); String url=request.getRequestURL().toString(); return url.contains("/api-a/");//只对api-a的请求进行验证 } //过滤的顺序 @Override public int filterOrder() { return 0; } //返回过滤器的类型,pre:路由前,routing:路由时,post:路由之后,error:发生错误时调用 @Override public String filterType() { return "pre"; } }
2.2 启动查看效果
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