java.lang.IllegalStateException: getOutputStream() has already been called
1 <%@page language="java" contentType="text/html; charset=UTF-8"%>
2 <%@page import="java.util.*,java.io.*"%>
3 <html>
4 <head>
5 <title>下载页面</title>
6 </head>
7
8 <body>
9 <%
10 response.reset(); //记住要记住reset浏览器清空缓存,否则可能会出现乱码情况
11
12 OutputStream o=response.getOutputStream();
13
14 ResourceBundle res = ResourceBundle.getBundle("test"); //test.properties
15 String XLSFile = res.getString("tempFileRootPath") + "/excel";
16 File fileLoad=new File(XLSFile,"temp.xls");
17
18 if(fileLoad.exists()) {
19 response.setHeader("Content-disposition","attachment;filename="+URLEncoder.encode("filename文件名", "UTF-8")+".xls");//文件中文名UTF-8
20 response.setContentType("application/vnd.ms-excel");
21 long fileLength=fileLoad.length();
22 String length=String.valueOf(fileLength);
23 response.setHeader("Content_Length",length);
24
25 FileInputStream in = new FileInputStream(fileLoad);
26 OutputStream o = null;
27 try{
28 in = new FileInputStream(fileLoad);
29
30 o = response.getOutputStream();
31 out.clear();
32 out = pageContext.pushBody(); //
33
34 int n=0;
35 byte b[]=new byte[500];
36
37 while((n=in.read(b))!=-1) {
38 o.write(b,0,n);
39 }
40 o.flush();
41
42 } catch (Exception e) {
43 out.write("文件导出异常" + e.toString());
44 } finally {
45 if(in != null) {
46 try {
47 in.close();
48 } catch(Exception e) {}
49 }
50 if(o != null) {
51 try {
52 o.close();
53 } catch(Exception e) {}
54 }
55 }
56 } else {
57 out.write("未找到导出的临时文件");
58 }
59
60 %>
61
62 </body>
63 </html>
异常是由于冲突导致的，在使用完response.getOutputStream()的后面加上两句（标黄）：
out.clear(); out = pageContext.pushBody();