getoutputstream java_Java已为此响应调用getOutputStream（）

我谷歌的错误消息getOutputStream() has already been called for this response ，很多人说，这是因为后面的空格或换行，但在我的代码，没有一个空格或一个换行符。我在Linux上使用tomcat6。

page import="java.servlet.*,

javax.servlet.http.*,

java.io.*,

java.util.*,

com.lowagie.text.pdf.*,

com.lowagie.text.*"

%>

response.setContentType("application/pdf");

Document document = new Document();

try{

ByteArrayOutputStream buffer = new ByteArrayOutputStream();

PdfWriter.getInstance(document, buffer);

document.open();

PdfPTable table = new PdfPTable(2);

table.addCell("1");

table.addCell("2");

table.addCell("3");

table.addCell("4");

table.addCell("5");

table.addCell("6");

document.add(table);

document.close();

DataOutput dataOutput = new DataOutputStream(response.getOutputStream());

byte[] bytes = buffer.toByteArray();

response.setContentLength(bytes.length);

for(int i = 0; i < bytes.length; i++)

{

dataOutput.writeByte(bytes[i]);

}

}catch(DocumentException e){

e.printStackTrace();

}

%>

〜

org.apache.jasper.JasperException: java.lang.IllegalStateException: getOutputStream() has already been called for this response

org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

根本原因

java.lang.IllegalStateException: getOutputStream() has already been called for this response

org.apache.catalina.connector.Response.getWriter(Response.java:610)

org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198)

org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125)

org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118)

org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:188)

org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118)

org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77)

org.apache.jsp.Account.Domain.testPDF_jsp._jspService(testPDF_jsp.java:94)

org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)

org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)

org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)