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写一个拦截处理的CountExportHandle，返回一个CountOutputStream，在write时计数，最后在close的时候输出大小。

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示例源码

Code Block
languagexml
titleCountExportHandle
collapsetrue
import com.finebi.stable.fun.ExportType;
import com.finebi.stable.fun.impl.AbstractExportHandleProvider;
import java.io.OutputStream;
public class CountExportHandle extends AbstractExportHandleProvider {
    @Override
    public OutputStream handleStream(OutputStream originalOutputStream, ExportType type) {
        return new CountOutputStream(originalOutputStream);
    }

}

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