Zuul Pre和Post过滤器

一、项目架构图

二、前置过滤器

@Component
public class TokenFilter  extends ZuulFilter{
    @Override
    public String filterType() {
        return PRE_TYPE;
    }

    @Override
    public int filterOrder() {
        return PRE_DECORATION_FILTER_ORDER - 1;
    }

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

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
        HttpServletRequest request =  requestContext.getRequest();

        //这里从url参数获取，也可以从cookie，header里获取
        String token = request.getParameter("token");
        if(StringUtils.isEmpty(token)){
            //不通过
            requestContext.setSendZuulResponse(false);
            requestContext.setResponseStatusCode(HttpStatus.SC_UNAUTHORIZED);
        }
        return null;
    }
}

　　

带了token就能正常访问

否则，无法访问，返回401

三、后置过滤器

1、增加后置过滤器

@Component
public class AddResponseHeaderFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return POST_TYPE;
    }

    @Override
    public int filterOrder() {
        return SEND_RESPONSE_FILTER_ORDER - 1;
    }

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

    @Override
    public Object run() throws ZuulException {
        RequestContext requestContext = RequestContext.getCurrentContext();
       HttpServletResponse response = requestContext.getResponse();
       response.setHeader("X-Foo", UUID.randomUUID().toString());
        return null;
    }
}

　　在回复后里增加X-Foo，值为UUID

2、查看结果