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。
一、路由功能
1.创建service-zuul项目
2.引入Eureka Server和Zuul依赖
3.入口类加上注解
@SpringBootApplication
@EnableZuulProxy
@EnableEurekaClient
@EnableDiscoveryClient
public class ServiceZuulApplication {
public static void main(String[] args) {
SpringApplication.run( ServiceZuulApplication.class, args );
}
}
4.设置配置文件
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/
server:
port: 8769
spring:
application:
name: service-zuul
zuul:
routes:
api-a:
path: /api-a/**
serviceId: service-feign
启动相应的项目,访问http://localhost:8769/api-a/hi?name=forezp
二、服务过滤
设置过滤配置:
@Component
public class MyFilter extends ZuulFilter {
private static Logger log = LoggerFactory.getLogger(MyFilter.class);
/**
* pre:路由之前
* routing:路由之时
* post: 路由之后
* error:发送错误调用
*/
@Override
public String filterType() {
return "pre";
}
/**
* filterOrder:过滤的顺序
*/
@Override
public int filterOrder() {
return 0;
}
/**
* shouldFilter:这里可以写逻辑判断,是否要过滤,本文true,永远过滤。
*/
@Override
public boolean shouldFilter() {
return true;
}
/**
* 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 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;
}
}
访问http://localhost:8769/api-a/hi?name=forezp: