ype 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. ----------------------
?由于jsp container在处理完成请求后会调用releasePageContet方法释放所用的PageContext object,并且同时调用getWriter方法,由于getWriter方法与在jsp页面中使用流相关的getOutputStream方法冲突,所以会造成这种异常,解决办法是:
只需要在jsp页面的最后加上两条语句:??
out.clear();?
out=pageContext.pushBody();即可(其中out,pageContext均为jsp内置对象!)
?
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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注明：转自http://www.cppblog.com/fenglin/articles/126788.html
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