jsp下载文件的问题

要提供给客户一个下载xml文件备份的功能
思路确定了
生成xml
在服务器指定目录创建文件
取得文件路径，弹出下载框

Java语言:01 <%@ page contentType="text/html;charset=UTF-8" language="java"%>
02 <%@ page import="java.io.*" %>
03 <%
04      String pathurl = (String)request.getAttribute("pathurl");
05      if(pathurl !=null && !pathurl.equals("")){
06    
07             String addressReport = application.getRealPath("/")+"saveFiles"+File.separator+pathurl;
08             //String addressReport = PageConstraint.XML_PATH_SEND+pathurl;
09            addressReport = addressReport.replace(File.separator,File.separator+File.separator);
10           
11           //   设置响应头和下载保存的文件名
12           response.setContentType("APPLICATION/OCTET-STREAM;charset=UTF-8");
13           response.setHeader("Content-Disposition",
14           "attachment;   filename=\""   +   pathurl   +   "\"");
15           
16           //   打开指定文件的流信息
17           java.io.FileInputStream   fileInputStream   =
18           new   java.io.FileInputStream(addressReport);
19           
20           写出流信息
21           int   i;
22           while   ((i=fileInputStream.read())   !=   -1)   {
23               out.write(i);
24           }
25    
26           fileInputStream.close();
27           out.close();
28           
29     }
30   %>
这么写在jsp文件中的代码，开始试验没有问题，但是如果xml中有中文，就会是乱码，xml文件是使用utf8生成的，猜想可能是在流读取的时候编码不对，于是在网上搜得了下面这样的写法，通过InputStreamReader设置了编码UTF-8
测试成功

Java语言:
01 <%@ page contentType="text/html;charset=UTF-8" language="java"%>
02 <%@ page import="java.io.*" %>
03 <%
04      String pathurl = (String)request.getAttribute("pathurl");
05      if(pathurl !=null && !pathurl.equals("")){
06    
07             String addressReport = application.getRealPath("/")+"saveFiles"+File.separator+pathurl;
08             //String addressReport = PageConstraint.XML_PATH_SEND+pathurl;
09            addressReport = addressReport.replace(File.separator,File.separator+File.separator);
10           
11           //   设置响应头和下载保存的文件名
12           response.setContentType("APPLICATION/OCTET-STREAM;charset=UTF-8");
13           response.setHeader("Content-Disposition",
14           "attachment;   filename=\""   +   pathurl   +   "\"");
15           
16           //   打开指定文件的流信息
17           java.io.FileInputStream   fileInputStream   =
18           new   java.io.FileInputStream(addressReport);
19           
20           //   写出流信息
21           //int   i;
22           //while   ((i=fileInputStream.read())   !=   -1)   {
23           //out.write(i);
24           //}
25    
26           //fileInputStream.close();
27           //out.close();
28          
29           InputStreamReader   reader=new   InputStreamReader(fileInputStream,"UTF-8");
30           int   i=0;
31           while((i=reader.read())!=-1){
32               out.write(i);
33
34           }
35           reader.close();
36           fileInputStream.close();
37           out.close();
38     }
39 %>
总结：还是对java的流相关只是掌握不清啊，不能熟练运用