dubbo Filter

对于Java Web应用，spring的拦截器可以拦截Web接口的调用，而对于dubbo接口，Spring的拦截器就不管用了。要实现此功能，需要dubbo提供Filter
dubbo中的Filter过滤器的使用场景：
1 、IP白名单
示例：给dubbo接口添加白名单——dubbo Filter的使用
http://blog.csdn.net/mj158518/article/details/47379799
2 、soa调用异常处理

import com.alibaba.dubbo.rpc.*;
import com.#.service.channel.dto.response.ResponseResult;
import com.##.service.channel.dto.response.ResponseResult.ResponseCode;
import com.##.service.common.exception.BusinessException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


public class EPayFilter implements Filter {

    private static final Logger LOGGER = LoggerFactory.getLogger(EPayFilter.class);

    @Override
    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        Result result = invoker.invoke(invocation);
        if (result.hasException()) {
            Throwable exception = result.getException();
            if (exception instanceof BusinessException) {
                LOGGER.error("调用方法{}出现异常，请求参数为：{}，异常信息为：{}", invocation.getMethodName(), invocation.getArguments(), exception.getMessage());
                BusinessException e = (BusinessException) exception;
                ResponseResult responseResult = new ResponseResult(e.getResponseCode(), e.getMessage());
                return new RpcResult(responseResult);
            }
            LOGGER.error("调用方法{}出现异常，请求参数为：{}", invocation.getMethodName(), invocation.getArguments(), exception);
            ResponseResult responseResult = new ResponseResult(ResponseCode.EXCEPTION, exception.getMessage());
            return new RpcResult(responseResult);
        }
        return result;
    }
}

配置参考白名单示例

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