springboot zuul实现网关的代码

网关在微服务里的角色

在微服务架构体系里,网关是非常重要的一个环节,它主要实现了一些功能的统一处理,包括了:

  1. 统一授权
  2. 统一异常处理
  3. 路由导向
  4. 跨域处理
  5. 限流

实践一下

1 添加依赖

dependencies {

implementation('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')

implementation('org.springframework.cloud:spring-cloud-starter-netflix-zuul')

testImplementation('org.springframework.boot:spring-boot-starter-test')

implementation('com.marcosbarbero.cloud:spring-cloud-zuul-ratelimit:1.3.2.RELEASE')

}

2 添加yml

server:

port: 8300

spring:

application:

name: microservice-gateway-zuul

eureka:

client:

register-with-eureka: true

fetch-registry: true

service-url:

defaultZone: http://localhost:6761/eureka

instance:

ip-address: true

zuul:

routes:

users:

path: /lind/** #以lind开头的路径被重定向到lind服务

serviceId: lind

add-host-header: true #显示真实的http头

retryable: false #关闭Hystrix的重试功能

ratelimit:

enabled: true

# repository: REDIS

behind-proxy: true

policies:

users:

limit: 5 #限流,每分钟请求5次

refresh-interval: 60

type:

- user

- origin

- url

# url类型的限流就是通过请求路径区分

# origin是通过客户端IP地址区分

# user是通过授权用户进行区分,也包括匿名用户

3 添加实现代码

http拦截器,获取用户ID,为子服务进行传递

public class PreRequestLogFilter extends ZuulFilter {

private static final Logger logger = LoggerFactory.getLogger(PreRequestLogFilter.class);

private final RateLimiter rateLimiter = RateLimiter.create(1000.0);

@Override

public Object run() {

try {

RequestContext currentContext = RequestContext.getCurrentContext();

HttpServletResponse response = currentContext.getResponse();

HttpServletRequest reqeust = currentContext.getRequest();

currentContext.addZuulRequestHeader("userId","123");//向子系统http头写数据

currentContext.addZuulRequestHeader("userName","test");

PreRequestLogFilter.logger.info(

String.format("send %s request to %s",

reqeust.getMethod(),

reqeust.getRequestURL().toString()));

if (!rateLimiter.tryAcquire()) {

HttpStatus httpStatus = HttpStatus.TOO_MANY_REQUESTS;

response.setContentType(MediaType.TEXT_PLAIN_VALUE);

response.setStatus(httpStatus.value());

response.getWriter().append(httpStatus.getReasonPhrase());

currentContext.setSendZuulResponse(false);

throw new ZuulException(

httpStatus.getReasonPhrase(),

httpStatus.value(),

httpStatus.getReasonPhrase()

);

}

} catch (java.lang.Exception e) {

ReflectionUtils.rethrowRuntimeException(e);

}

return null;

}

@Override

public boolean shouldFilter() {

// 判断是否需要过滤

return true;

}

@Override

public String filterType() {

return FilterConstants.PRE_TYPE;

}

@Override

public int filterOrder() {

return Ordered.HIGHEST_PRECEDENCE;

}

}

在主程中注入这个过滤器

@Bean

public PreRequestLogFilter preRequestLogFilter() {

return new PreRequestLogFilter();

}

4 使用它

在URL上通过localhost:8300/users/home 将进行lind服务里的home控制器下,并在http头上写入了userid和username这个键值对!

总结

以上所述是小编给大家介绍的springboot zuul实现网关,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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