什么关闭AbstractSerializer中的OutputStream？(what closes OutputStream in AbstractSerializer?)

 我有自己的类扩展org.apache.cocoon.serialization.AbstractSerializer （非常基本） 
 
public class ExcelSerializer extends AbstractSerializer {

private static final XLogger LOG = XLoggerFactory.getXLogger(ExcelSerializer.class);

private ExcelSheetCreator excelSheetCreator;

public ExcelSerializer() {
    try {
        excelSheetCreator = new ExcelSheetCreator();
    } catch (IOException e) {
        LOG.error("ERROR", e.getMessage());
    }
}



@Override
public void startElement(String uri, String loc, String raw, Attributes a) throws SAXException {
    excelSheetCreator.startElement(uri, loc, raw, a);
}

@Override
public void characters(char[] c, int start, int len) throws SAXException {
    excelSheetCreator.characters(c, start, len);
}

@Override
public void endElement(String uri, String loc, String raw) throws SAXException {
    excelSheetCreator.endElement(uri, loc, raw);
}


@Override
public void endDocument() throws SAXException {
    excelSheetCreator.setOutputStream(this.output);
    excelSheetCreator.endDocument();

}
 
 } 
 
 第一次尝试一切正常，我得到了预期的输出。 从第二个开始，我从ExcelSerializer调用的类会抛出IOException，因为该流已经关闭。 
 
@Override
public void endDocument() throws SAXException {
    try {
        workbook.write(outputStream);
    } catch (IOException e) {
        System.out.println("workbook");
        System.out.println("" + e.getMessage());
    }
    workbook.dispose();
}
 
 我当然没有关闭Outputstream，或者至少没有故意关闭。 我该怎么办才能保持开放状态？ 
 
 这是我的站点地图： 
 
 <map:serializer  name="excelSerializer" logger="sitemap.serializer.excelSerializer" src="com.acrys.excel.ExcelSerializer" 
           mime-type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
         </map:serializer>

I have my own class extending org.apache.cocoon.serialization.AbstractSerializer (quite basic)
 
public class ExcelSerializer extends AbstractSerializer {

private static final XLogger LOG = XLoggerFactory.getXLogger(ExcelSerializer.class);

private ExcelSheetCreator excelSheetCreator;

public ExcelSerializer() {
    try {
        excelSheetCreator = new ExcelSheetCreator();
    } catch (IOException e) {
        LOG.error("ERROR", e.getMessage());
    }
}



@Override
public void startElement(String uri, String loc, String raw, Attributes a) throws SAXException {
    excelSheetCreator.startElement(uri, loc, raw, a);
}

@Override
public void characters(char[] c, int start, int len) throws SAXException {
    excelSheetCreator.characters(c, start, len);
}

@Override
public void endElement(String uri, String loc, String raw) throws SAXException {
    excelSheetCreator.endElement(uri, loc, raw);
}


@Override
public void endDocument() throws SAXException {
    excelSheetCreator.setOutputStream(this.output);
    excelSheetCreator.endDocument();

}
 
}
 
For the first attempt everything is OK, I got the expected output. From the second one onwards, the class that I call from ExcelSerializer throws an IOException, because the stream has already been closed. 
 
@Override
public void endDocument() throws SAXException {
    try {
        workbook.write(outputStream);
    } catch (IOException e) {
        System.out.println("workbook");
        System.out.println("" + e.getMessage());
    }
    workbook.dispose();
}
 
I certainly did not close the Outputstream or at least not knowingly. What can I do to keep it open? 
 
Here is my sitemap:
 
 <map:serializer  name="excelSerializer" logger="sitemap.serializer.excelSerializer" src="com.acrys.excel.ExcelSerializer" 
           mime-type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
         </map:serializer>

原文：https://stackoverflow.com/questions/22357338