本质上zuul充当的负载均衡器和路由是一致的,比如请求url: /api/restaurant_server/get 和 /api//user_ser/get 两者通过zuul可以分别映射到restaurant server和user server上 zuul 除了上述两大功能外海具有:
Authentication
Insights
Stress Testing
Canary Testing
Dynamic Routing
Service Migration
Load Shedding
Security
Static Response handling
Active/Active traffic management
pom 文件添加
<!--其他省略-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
@SpringBootApplication
@EnableZuulProxy
@EnableEurekaClient
@EnableDiscoveryClient
public class ZuulApplication {
public static void main(String[] args) {
SpringApplication.run( ZuulApplication .class, args );
}
}
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
server:
port: 8769
spring:
application:
name: zuul-server # Service registers under this name
zuul:
ignoredServices: "*"
routes:
restaurantapi:
path: /api/**
serviceId: api-service
stripPrefix: true
指定服务注册中心的地址为http://localhost:8761/eureka/,服务的端口为8769,服务名为service-zuul;以/api/ 开头的请求都转发给api-service服务
@Component
public class MyFilter extends ZuulFilter {
private static Logger log = LoggerFactory.getLogger(MyFilter.class);
@Override
public String filterType() {
return "pre";
//pre:路由之前
//routing:路由之时
//post: 路由之后
//error:发送错误调用
//filterOrder:过滤的顺序
//shouldFilter:这里可以写逻辑判断,是否要过滤,本文true,永远过滤。
//run:过滤器的具体逻辑。可用很复杂,包括查sql,nosql去判断该请求到底有没有权限访问。
}
@Override
public int filterOrder() {
return 0;
}
@Override
public boolean shouldFilter() {
return true;
}
@Override
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) {
log.warn("token is empty");
ctx.setSendZuulResponse(false);
ctx.setResponseStatusCode(401);
try {
ctx.getResponse().getWriter().write("token is empty");
}catch (Exception e){}
return null;
}
log.info("ok");
return null;
}
}