Spring Cloud - 使用路由网关的服务过滤功能

package com.ycq.hello.spring.cloud.zuul.filter;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.springframework.stereotype.Component;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
/**
 * Zuul 的服务过滤
 * Title: LoginFilter
 * Description:
 *
 * @author yaoChuanQing
 * @date 2020-11-22 23:05
 * @version 1.0.0
 */
@Component
public class LoginFilter extends ZuulFilter {
    /**
     * 配置过滤类型，有四种不同生命周期的过滤器类型
     * 1. pre：路由之前
     * 2. routing：路由之时
     * 3. post：路由之后
     * 4. error：发送错误调用
     * @return
     */
    @Override
    public String filterType() {
        return "pre";
    }
    /**
     * 配置过滤的顺序
     * @return
     */
    @Override
    public int filterOrder() {
        return 0;
    }
    /**
     * 配置是否需要过滤：true/需要，false/不需要
     * @return
     */
    @Override
    public boolean shouldFilter() {
        return true;
    }
    /**
     * 过滤器的具体业务代码
     * @return
     * @throws ZuulException
     */
    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        String token = request.getParameter("token");
        if(token == null){
            HttpServletResponse response = currentContext.getResponse();
            response.setContentType("text/html;charset=utf-8");
            try {
                // 不发送 zuul 的响应
                currentContext.setSendZuulResponse(false);
                //响应码
                currentContext.setResponseStatusCode(401);
                ObjectMapper objectMapper = new ObjectMapper();
                Map<String, Object> map = new HashMap<>();
                map.put("status", 401);
                map.put("message", "非法请求");
                response.getWriter().write(objectMapper.writeValueAsString(map));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}

{
    "message": "非法请求",
    "status": 401
}

You message is HelloZuul，You port is 8763