📄 jsp文件下载及出现getoutputstream() has already been called for ___的解决方法.htm
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26, 2005 11:03:55 AM </TD>
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<TD>JSP文件下载及出现getOutputStream() has already been called for
this
response的解决方法<BR><BR>http://iamin.blogdriver.com/iamin/1072546.html<BR><BR>一、采用RequestDispatcher的方式进行<BR><BR>1、web.xml文件中增加<BR>
<mime-mapping><BR>
<extension>doc</extension><BR>
<mime-type>application/vnd.ms-word</mime-type><BR>
</mime-mapping><BR><BR><BR>2、程序如下：<BR><BR><%@page
language="java" import="java.net.*"
pageEncoding="gb2312"%><BR><%<BR>
response.setContentType("application/x-download");//设置为下载application/x-download<BR>
String filenamedownload =
"/系统解决方案.doc";//即将下载的文件的相对路径<BR> String
filenamedisplay =
"系统解决方案.doc";//下载文件时显示的文件保存名称<BR>
filenamedisplay =
URLEncoder.encode(filenamedisplay,"UTF-8");<BR>
response.addHeader("Content-Disposition","attachment;filename="
+ filenamedisplay);<BR>
<BR> try<BR>
{<BR>
RequestDispatcher dispatcher =
application.getRequestDispatcher(filenamedownload);<BR>
if(dispatcher !=
null)<BR>
{<BR>
dispatcher.forward(request,response);<BR>
}<BR>
response.flushBuffer();<BR>
}<BR> catch(Exception
e)<BR>
{<BR>
e.printStackTrace();<BR>
}<BR> finally<BR>
{<BR> <BR>
}<BR>%><BR><BR><BR>二、采用文件流输出的方式下载<BR><BR>1、web.xml文件中增加<BR>
<mime-mapping><BR>
<extension>doc</extension><BR>
<mime-type>application/vnd.ms-word</mime-type><BR>
</mime-mapping><BR><BR><BR>2、程序如下：<BR><BR><%@page
language="java" contentType="application/x-msdownload"
import="java.io.*,java.net.*"
pageEncoding="gb2312"%><%<BR>
//关于文件下载时采用文件流输出的方式处理：<BR>
//加上response.reset()，并且所有的％>后面不要换行，包括最后一个；<BR>
//因为Application
Server在处理编译jsp时对于％>和<％之间的内容一般是原样输出，而且默认是PrintWriter，<BR>
//而你却要进行流输出：ServletOutputStream，这样做相当于试图在Servlet中使用两种输出机制，<BR>
//就会发生：getOutputStream() has already been called for this
response的错误<BR> //详细请见《More Java
Pitfill》一书的第二部分 Web层Item 33：试图在Servlet中使用两种输出机制
270<BR>
//而且如果有换行，对于文本文件没有什么问题，但是对于其它格式，比如AutoCAD、Word、Excel等文件<BR>
//下载下来的文件中就会多出一些换行符0x0d和0x0a，这样可能导致某些格式的文件无法打开，有些也可以正常打开。<BR><BR>
response.reset();//可以加也可以不加<BR>
response.setContentType("application/x-download");//设置为下载application/x-download<BR>
//
/../../退WEB-INF/classes两级到应用的根目录下去，注意Tomcat与WebLogic下面这一句得到的路径不同，WebLogic中路径最后没有/<BR>
System.out.println(this.getClass().getClassLoader().getResource("/").getPath());<BR>
String filenamedownload =
this.getClass().getClassLoader().getResource("/").getPath() +
"/../../系统解决方案.doc";<BR> String
filenamedisplay =
"系统解决方案.doc";//系统解决方案.txt<BR>
filenamedisplay =
URLEncoder.encode(filenamedisplay,"UTF-8");<BR>
response.addHeader("Content-Disposition","attachment;filename="
+ filenamedisplay);<BR><BR> OutputStream
output = null;<BR> FileInputStream fis =
null;<BR> try<BR>
{<BR> output =
response.getOutputStream();<BR>
fis = new
FileInputStream(filenamedownload);<BR><BR>
byte[] b = new
byte[1024];<BR> int
i = 0;<BR><BR>
while((i = fis.read(b)) >
0)<BR>
{<BR>
output.write(b, 0,
i);<BR>
}<BR>
output.flush();<BR> }<BR>
catch(Exception e)<BR>
{<BR>
System.out.println("Error!");<BR>
e.printStackTrace();<BR>
}<BR> finally<BR>
{<BR> if(fis !=
null)<BR>
{<BR>
fis.close();<BR>
fis = null;<BR>
}<BR> if(output !=
null)<BR>
{<BR>
output.close();<BR>
output = null;<BR>
}<BR>
}<BR>%><BR></TD></TR></TBODY></TABLE><BR><BR>
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<TD><SPAN class=bright-subject><A name=179308></A>Re:
JSP文件下载及出现getOutputStream() has already been called for
...的解决方法 </SPAN></TD></TR></TBODY></TABLE><BR>提交时间: Nov 30, 2005
3:20:11 PM </TD>
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<TD>修改了一下，在WebLogic上面路径/的问题。
<BR>Tomcat与WebLogic下面这一句得到的路径不同，WebLogic中路径最后没有/<BR></TD></TR></TBODY></TABLE><BR><BR>
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<DIV
style="PADDING-RIGHT: 4px; PADDING-LEFT: 4px; PADDING-BOTTOM: 4px; WIDTH: 96%; PADDING-TOP: 4px; TEXT-ALIGN: left">只有正确地找到问题的根本所在，才能成功地解决掉问题：）<BR>Read
a bit and take it out , then come back read some more .<BR><A
href="http://yulimin.javaeye.com/" target=_blank><BR><IMG
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onclick=javascript:window.open(this.src); src=""
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