springcloud<zuul过滤器简单配置与跨域设置>

package com.wangbiao.config;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.FORWARD_TO_KEY;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.SERVICE_ID_KEY;

/**
 * TODO
 *
 * @author wangbiao
 * @Title TODO
 * @module TODO
 * @description 过滤器
 * @date 2021/4/10 22:21
 */
@Slf4j
@Component
public class TokenFilter  extends ZuulFilter {
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;//pre：路由之前;routing：路由之时;post： 路由之后;error：发送错误调用
    }

    @Override
    public int filterOrder() {
      return   FilterConstants.PRE_DECORATION_FILTER_ORDER - 1;
//        return 0;// 优先级0，数字越大，优先级越低
    }

    @Override
    public boolean shouldFilter() {
//        RequestContext ctx = RequestContext.getCurrentContext();
//        return !ctx.containsKey(FORWARD_TO_KEY) // 判断filter是否被转发
//                && !ctx.containsKey(SERVICE_ID_KEY); // 判断filter是否定义了serviceId

        return true;// 是否执行该过滤器，此处为true为过滤
    }

//    shouldFilter() 为true 此方法执行
    @Override
    public Object run() throws ZuulException {
        RequestContext ctx = RequestContext.getCurrentContext();
        ctx.getResponse().setCharacterEncoding("gbk");

        HttpServletRequest request = ctx.getRequest();
        log.info(String.format("%s -----------> %s", request.getMethod(), request.getRequestURL().toString()));

        Object accessToken = request.getParameter("token");// 获取请求的参数
        if(accessToken == null) {
            ctx.setSendZuulResponse(false);// 是否允许该请求对下游进行路由
            ctx.setResponseStatusCode(401);// 返回错误码
            ctx.setResponseBody("{\"status\":401,\"message\":\"token为空！\"}");//返回错误内容

            //或者也可以后端打印下try {ctx.getResponse().getWriter().write("token is null");}catch (Exception e){}

            //filter-is-success保存于上下文，作为同类型下游Filter的执行开关
            ctx.set("filter-is-success", false);
            return null;
        }
//        ctx.addZuulRequestHeader("phone", phone);
//        ctx.addZuulRequestHeader("customerId", customerId);
        ctx.set("filter-is-success", true);
        return null;
    }
}

package com.wangbiao.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
* TODO
*
* @author wangbiao
* @Title TODO
* @module TODO
* @description 跨域请求
* @date 2021/4/11 12:05
*/
@Configuration
public class DiyCorsConfiguration {
@Bean
public CorsFilter corsFilter() {
final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
final CorsConfiguration config = new CorsConfiguration();
config.setAllowCredentials(true);//允许cookies跨域
config.setMaxAge(18000L);// 预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了
config.addAllowedOrigin("*");
config.addAllowedHeader("*");
config.addAllowedMethod("*");
config.setMaxAge(3600L);
source.registerCorsConfiguration("/**", config);
return new CorsFilter(source);
}
}