springcloud zuul 使用zuulfilter 修改请求路径和响应头

package com.example.demo;

import java.net.URI;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
/**
 * 需求：如果请求路径内包含list请求，则重新路由到指定的接口，路由结束后，修改响应头
 * 
 * @author mxf
 *
 */
@Component
public class RequestFilter extends ZuulFilter {

	@Override
	public boolean shouldFilter() {
		RequestContext ctx = RequestContext.getCurrentContext();
		HttpServletRequest request = ctx.getRequest();
		String uri = request.getRequestURI();
		/**
		 * 根据条件去判断是否需要路由，是否需要执行该过滤器
		 */
		if (uri.contains("list")) {
			return true;
		}
		return false;
	}

	@Override
	public Object run() throws ZuulException {
		RequestContext ctx = RequestContext.getCurrentContext();
		HttpServletResponse response = ctx.getResponse();
		try {
			// 下面是资源地址
			// http://192.168.16.72:8077/group1/M00/00/03/wKgQSVzHshWAdSpoAAAFsn6csJI682.png
//				URI uri2 = new URI(requestURL.substring(0,requestURL.indexOf(requestURI) + 1));
			/**
			 * 重点：因为根据条件去路由新的链接，所以这里要重新设置 RouteHost 和 URI
			 */
			URI uri2 = new URI("http://192.168.16.72:8077/");
			// 设置新的RouteHost
			ctx.setRouteHost(uri2.toURL());
			/**
			 * 请求间携带的信息  放在请求头中，方便响应的时候修改响应头
			 */
			response.addHeader("sign", "target");
			response.addHeader("info", "bb.png");
			response.addHeader("info_size", "1458");
		} catch (Exception e1) {
			e1.printStackTrace();
		}
		// 设置新的URI
		ctx.put(FilterConstants.REQUEST_URI_KEY, "group1/M00/00/03/wKgQSVzHshWAdSpoAAAFsn6csJI682.png");
		return null;
	}

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

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

}

package com.example.demo;

import javax.servlet.http.HttpServletResponse;

import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;

/**
 * 根据您条件修改响应头
 * @author mxf
 *
 */
@Component
public class ResponseFilter extends ZuulFilter{

	/**
	 * 是否执行该过滤器
	 */
	@Override
	public boolean shouldFilter() {
		RequestContext currentContext = RequestContext.getCurrentContext();
		HttpServletResponse response = currentContext.getResponse();
		String sign = response.getHeader("sign");
		String info = response.getHeader("info");
		String info_size = response.getHeader("info_size");
		
		if (!StringUtils.isEmpty(sign) && !StringUtils.isEmpty(info) && !StringUtils.isEmpty(info_size)) {
			return true;
		}
		return false;
	}

	@Override
	public Object run() throws ZuulException {
		RequestContext ctx = RequestContext.getCurrentContext();
		HttpServletResponse response = ctx.getResponse();
		String info = response.getHeader("info");
		String info_size = response.getHeader("info_size");
		/**
		 * 设置响应头，使请求变为文件下载
		 */
		ctx.addZuulResponseHeader("Content-Type", "application/octet-stream");
        ctx.addZuulResponseHeader("Content-Disposition", "attachment;fileName=" + info);
        ctx.addZuulResponseHeader("Content-Length", ""+info_size);
		return null;
	}

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

	@Override
	public int filterOrder() {
		return FilterConstants.SEND_RESPONSE_FILTER_ORDER - 2;
	}

	
}