十一：Apache Dubbo 之 Filter（一）介绍及演示

我就是我 2024-04-08 13:02 53阅读 0赞

#### Apache Dubbo Filter 介绍 ####

*  Apache Dubbo的Filter与Servlet 的Filter功能类似
 *  自定义Filter需要扩展Filter接口
 *  自定义Filter可以通过@Activate注解完成默认开启

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#### Apache Dubbo Filter 演示 ####

***定义filter***

package com.jiangzheng.course.dubbo.provider.filter;
    
    import org.apache.dubbo.common.URL;
    import org.apache.dubbo.common.extension.Activate;
    import org.apache.dubbo.rpc.Filter;
    import org.apache.dubbo.rpc.Invocation;
    import org.apache.dubbo.rpc.Invoker;
    import org.apache.dubbo.rpc.Result;
    import org.apache.dubbo.rpc.RpcException;
    
    @Activate(group = "provider")
    public class MyFilter implements Filter {
        @Override
        public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
            URL url = invoker.getUrl();
            Class<?> anInterface = invoker.getInterface();
            String simpleName = anInterface.getSimpleName();
            String serviceName = invocation.getServiceName();
            String methodName = invocation.getMethodName();
    
            System.out.println("url : " + url.toFullString());
            System.out.println("simpleName : " + simpleName);
            System.out.println("serviceName : " + serviceName);
            System.out.println("methodName : " + methodName);
    
            return invoker.invoke(invocation);
        }
    }

***定义加载配置***  
![在这里插入图片描述][watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54Sm6JmR55qE5LqM54uX_size_20_color_FFFFFF_t_70_g_se_x_16 1]

***打印结果***

> url : dubbo://30.96.216.103:29014/com.jiangzheng.course.dubbo.api.service.ServiceDemoanyhost=true&application=provider&bind.ip=30.96.216.103&bind.port=29014&deprecated=false&dispatcher=all&dubbo=2.0.2&dynamic=true&generic=false&interface=com.jiangzheng.course.dubbo.api.service.ServiceDemo&metadata-type=remote&methods=getName,getSelf&pid=35168&release=3.0.0.preview&side=provider&timestamp=1647929726624  
> simpleName : ServiceDemo  
> serviceName : null  
> methodName : getSelf

***第二种开启方式***

<dubbo:service id="serviceDemo" filter="default,myFilter" interface="com.jiangzheng.course.dubbo.api.service.ServiceDemo" ref="iServiceDemo"/>

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[watermark_type_d3F5LXplbmhlaQ_shadow_50_text_Q1NETiBA54Sm6JmR55qE5LqM54uX_size_20_color_FFFFFF_t_70_g_se_x_16 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/08/fe6c6cf8f53741e9808ab1c351074335.png