网关 Spring Cloud Zuul 动态 Groovy Filter

矫情吗；* 2022-10-07 13:55 134阅读 0赞

**一、首先在pom.xml中引入groovy所需的jar**

<dependency>
        <groupId>org.codehaus.groovy</groupId>
        <artifactId>groovy-all</artifactId>
        <version>最新</version>
    </dependency>

**二、在Application.java 启动主类中添加Groovy加载器**

@Component
    public class GroovyRunner implements CommandLineRunner { 
    
        @Override
        public void run(String... args) throws Exception { 
            MonitoringHelper.initMocks();
            FilterLoader.getInstance().setCompiler(new GroovyCompiler());
            try { 
                FilterFileManager.setFilenameFilter(new GroovyFileFilter());
                // 每隔多少秒，扫描目录下的groovy文件
                FilterFileManager.init(5, "/laker/groovy");
            } catch (Exception e) { 
                throw new RuntimeException();
            }
        }
    }

**三、编写GroovyFilter.groovy过滤器，并放入到指定目录**

import com.netflix.zuul.ZuulFilter
    import com.netflix.zuul.context.RequestContext
    import com.netflix.zuul.exception.ZuulException
    import org.apache.catalina.servlet4preview.http.HttpServletRequest
    import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants
     
    class GroovyFilter extends ZuulFilter{ 
        @Override
        String filterType() { 
            return FilterConstants.PRE_TYPE
        }
     
        @Override
        int filterOrder() { 
            return 5 // 过滤器优先级
        }
     
        @Override
        boolean shouldFilter() { 
            return true
        }
     
        @Override
        Object run() throws ZuulException { 
            HttpServletRequest request = RequestContext.currentContext.getRequest() as HttpServletRequest
            Iterator headerIt = request.getHeaderNames().iterator();
            while (headerIt.hasNext()) { 
                String name = (String) headerIt.next()
                String value = request.getHeader(name)
                println("header: " + name + ":" + value)
            }
            println("This is Groovy Filter")
            return null
        }
    }