?? jsp文件下載及出現(xiàn)getoutputstream() has already been called for ___的解決方法.htm
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name=178423></A>JSP文件下載及出現(xiàn)getOutputStream() has already been
called for ...的解決方法 </SPAN></TD></TR></TBODY></TABLE><BR>提交時(shí)間: Nov
26, 2005 11:03:55 AM </TD>
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<TD>JSP文件下載及出現(xiàn)getOutputStream() has already been called for
this
response的解決方法<BR><BR>http://iamin.blogdriver.com/iamin/1072546.html<BR><BR>一、采用RequestDispatcher的方式進(jìn)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");//設(shè)置為下載application/x-download<BR>
String filenamedownload =
"/系統(tǒng)解決方案.doc";//即將下載的文件的相對(duì)路徑<BR> String
filenamedisplay =
"系統(tǒng)解決方案.doc";//下載文件時(shí)顯示的文件保存名稱<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、采用文件流輸出的方式下載<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>
//關(guān)于文件下載時(shí)采用文件流輸出的方式處理：<BR>
//加上response.reset()，并且所有的％>后面不要換行，包括最后一個(gè)；<BR>
//因?yàn)锳pplication
Server在處理編譯jsp時(shí)對(duì)于％>和<％之間的內(nèi)容一般是原樣輸出，而且默認(rèn)是PrintWriter，<BR>
//而你卻要進(jìn)行流輸出：ServletOutputStream，這樣做相當(dāng)于試圖在Servlet中使用兩種輸出機(jī)制，<BR>
//就會(huì)發(fā)生：getOutputStream() has already been called for this
response的錯(cuò)誤<BR> //詳細(xì)請(qǐng)見《More Java
Pitfill》一書的第二部分 Web層Item 33：試圖在Servlet中使用兩種輸出機(jī)制
270<BR>
//而且如果有換行，對(duì)于文本文件沒有什么問題，但是對(duì)于其它格式，比如AutoCAD、Word、Excel等文件<BR>
//下載下來的文件中就會(huì)多出一些換行符0x0d和0x0a，這樣可能導(dǎo)致某些格式的文件無法打開，有些也可以正常打開。<BR><BR>
response.reset();//可以加也可以不加<BR>
response.setContentType("application/x-download");//設(shè)置為下載application/x-download<BR>
//
/../../退WEB-INF/classes兩級(jí)到應(yīng)用的根目錄下去，注意Tomcat與WebLogic下面這一句得到的路徑不同，WebLogic中路徑最后沒有/<BR>
System.out.println(this.getClass().getClassLoader().getResource("/").getPath());<BR>
String filenamedownload =
this.getClass().getClassLoader().getResource("/").getPath() +
"/../../系統(tǒng)解決方案.doc";<BR> String
filenamedisplay =
"系統(tǒng)解決方案.doc";//系統(tǒng)解決方案.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文件下載及出現(xiàn)getOutputStream() has already been called for
...的解決方法 </SPAN></TD></TR></TBODY></TABLE><BR>提交時(shí)間: Nov 30, 2005
3:20:11 PM </TD>
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<TD>修改了一下，在WebLogic上面路徑/的問題。
<BR>Tomcat與WebLogic下面這一句得到的路徑不同，WebLogic中路徑最后沒有/<BR></TD></TR></TBODY></TABLE><BR><BR>
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<DIV
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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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