我们可以将printwriter与Apache poi工作表一起使用吗

Question

I am creating a workbook and trying to download the same. The issue I am facing I am when I use the workbook.write(outputstream), it seems both outputstream and printwriter will not work together and this is creating an response already committed exception for me. Could you please let me know whether we have any ways to write this using printwriter, so I will come out of response already committed exception.

pRes.setContentType(MS_EXCEL); pRes.setHeader(CONTENT,FILENAME);

        outputStream = pRes.getOutputStream();
        workbook.write(outputStream);

The exception i am getting is,

java.lang.IllegalStateException: getOutputStream() has already been called for this response at org.apache.catalina.connector.Response.getWriter(Response.java:619) at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198) at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125) at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118) at org.apache.jasper.runtime.JspWriterImpl.flush(JspWriterImpl.java:173)

Answer 1

由于您是从jsp调用的，因此需要将此<%@ page trimDirectiveWhitespaces="true" %>到页面中，以防止空格干扰您的输出流。