type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: java.lang.IllegalStateException: getOutputStream() has already been called for this response
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:528)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause
java.lang.IllegalStateException: getOutputStream() has already been called for this response
org.apache.catalina.connector.Response.getWriter(Response.java:608)
org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:200)
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:189)
org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:122)
org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:79)
org.apache.jsp.do_005fdownload_jsp._jspService(do_005fdownload_jsp.java:74)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:68)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:376)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.2 logs.
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由于jsp container在處理完成請求后會調用releasePageContet方法釋放所用的PageContext object,并且同時調用getWriter方法,由于getWriter方法與在jsp頁面中使用流相關的getOutputStream方法沖突,所以會造成這種異常,解決辦法是:
只需要在jsp頁面的最后加上兩條語句:
out.clear();
out=pageContext.pushBody();即可(其中out,pageContext均為jsp內置對象!)
1 <%@ page language="java" contentType="text/html; charset=utf-8"
2 pageEncoding="utf-8" import="com.jspsmart.upload.*"%>
3<%
4 String dfilename = request.getParameter("dfilename");
5
6 SmartUpload su = new SmartUpload();
7 su.initialize(pageContext);
8 su.setContentDisposition(null);
9 su.downloadFile("/upload/" + dfilename);
10 out.clear();
11 out = pageContext.pushBody();
12%>
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