在Zuul网关中，如何在自定义过滤器中修改服务路径?

问题描述

我已经实现了zuul网关服务，用于我编写的一些微服务之间的通信.我有一个特定的场景，例如我想在我的自定义过滤器之一中更改服务路径，然后重定向到其他服务. zuul网关有可能吗?我尝试将带有更新的uri的"requestURI"参数放入路由过滤器中的请求上下文中，但效果不佳

I have implemented a zuul gateway service for the communication between some micro services that i have wrote. I have a specific scenario like i want to change the service path in one of my custom filter and redirected to some other service. Is this possible with the zuul gateway?. I have tried putting "requestURI" parameter with the updated uri to the request context in my route filter but that didn't worked out well

请帮帮我预先感谢

推荐答案

是的，可以.为此，您需要实现类型为PRE_TYPE的ZuulFilter，并使用指定的Location标头和响应状态为301或302更新响应.

yes, you can. for that you need to implement ZuulFilter with type PRE_TYPE, and update response with specified Location header and response status either 301 or 302.

@Slf4j
public class CustomRedirectFilter extends ZuulFilter {

    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return FilterConstants.SEND_FORWARD_FILTER_ORDER;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() {
        RequestContext ctx = RequestContext.getCurrentContext();
        String requestUrl = ctx.getRequest().getRequestURL().toString();

        if (shouldBeRedirected(requestUrl)) {
            String redirectUrl = generateRedirectUrl(ctx.getRequest());
            sendRedirect(ctx.getResponse(), redirectUrl);
        }
        return null;
    }

    private void sendRedirect(HttpServletResponse response, String redirectUrl){
        try {
            response.setHeader(HttpHeaders.LOCATION, redirectUrl);
            response.setStatus(HttpStatus.MOVED_PERMANENTLY.value());
            response.flushBuffer();
        } catch (IOException ex) {
            log.error("Could not redirect to: " + redirectUrl, ex);
        }
    }

    private boolean shouldBeRedirected(String requestUrl) {
        // your logic whether should we redirect request or not
        return true;
    }

    private String generateRedirectUrl(HttpServletRequest request) {
        String queryParams = request.getQueryString();
        String currentUrl =  request.getRequestURL().toString() + (queryParams == null ? "" : ("?" + queryParams));
        // update url
        return updatedUrl;
    }
}

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