Zuul过滤器动态加载

一 添加groovy依赖

            
                  org.codehaus.groovy
                  groovy-all
                  2.4.12
            

二 编写启动类

package org.crazyit.cloud;

import java.io.File;

import javax.annotation.PostConstruct;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

import com.netflix.zuul.FilterFileManager;
import com.netflix.zuul.FilterLoader;
import com.netflix.zuul.groovy.GroovyCompiler;
import com.netflix.zuul.groovy.GroovyFileFilter;

@SpringBootApplication
@EnableEurekaClient
@EnableZuulProxy
public class GatewayApp {

    @PostConstruct
    public void zuulInit() {
        FilterLoader.getInstance().setCompiler(new GroovyCompiler());
        // 读取配置，获取脚本根目录
        String scriptRoot = System.getProperty("zuul.filter.root", "groovy/filters");
        // 获取刷新间隔
        String refreshInterval = System.getProperty("zuul.filter.refreshInterval", "5");
        if (scriptRoot.length() > 0) scriptRoot = scriptRoot + File.separator;
        try {
            FilterFileManager.setFilenameFilter(new GroovyFileFilter());
            FilterFileManager.init(Integer.parseInt(refreshInterval), scriptRoot + "pre",
                    scriptRoot + "route", scriptRoot + "post");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(GatewayApp.class).web(true).run(args);
    }

}

三 构造动态加载目录

四 新建动态加载的过滤器

package groovy.filters;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import com.netflix.zuul.ZuulFilter;
class DynamicFilter extends ZuulFilter {
      public boolean shouldFilter() {
            return true;
      }
      public Object run() {
            System.out.println("=========  这一个是动态加载的过滤器：DynamicFilter");
            return null;
      }
      public String filterType() {
            return FilterConstants.ROUTE_TYPE;
      }
      public int filterOrder() {
            return 3;
      }
}

五 动态加载前效果

1 浏览器输入

http://localhost:9000/sale/food-sale/1

2 控制台输出

执行 MyFilter 过滤器

六 动态加载后效果

1 将动态加载过滤器拷贝到groovy.filters.route目录

2 浏览器输入

http://localhost:9000/sale/food-sale/1

3 控制台输出

执行 MyFilter 过滤器

=========  这一个是动态加载的过滤器：DynamicFilter