zuul 过滤器

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class LoginFilter extends ZuulFilter {
    //类型
    @Override
    public String filterType() {
        // pre ：前置过滤器
        // route ：routing to an origin
        // post ：后置过滤器
        // error ：当执行上述3个 出错时  进入error  ；error执行完 ，再进入post

        //过滤器常量
        return FilterConstants.PRE_TYPE;
    }
    //优先级
    @Override
    public int filterOrder() {
        return FilterConstants.PRE_DECORATION_FILTER_ORDER;
    }
    //是否启用过滤器
    @Override
    public boolean shouldFilter() {
        //开启过滤
        return true;
    }
    //执行过滤器
    @Override
    public Object run() throws ZuulException {
        //获取请求上下文
        RequestContext currentContext = RequestContext.getCurrentContext();
        //获取request
        HttpServletRequest request = currentContext.getRequest();
        //获取参数
        String token = request.getParameter("login-token");
        //判断
        if(StringUtils.isBlank(token)){
            //false 拦截  true 放行 (默认是true)
            currentContext.setSendZuulResponse(false);
            //HttpStatus.java 状态码
            currentContext.setResponseStatusCode(HttpStatus.FORBIDDEN.value());
        }
        return null;
    }
}