JSP 多个文件打包下载代码

现把该程序主要代码贴下,供大家需要的时候参考下:
<%@page　import="java.util.*,
java.net.*,
java.text.*,
java.util.zip.*,
java.io.*"　%>
<%!
static　Vector　expandFileList(String[]　files,　boolean　inclDirs){
Vector　v　=　new　Vector();
if　(files　==　null)　return　v;
for　(int　j=0;　j　<　files.length;　i )　v.add　(new　File(URLDecoder.decode(files[j])));
for　(int　i=0;　i　<　v.size();　i ){
File　f　=　(File)　v.get(i);
if　(f.isDirectory()){
File[]　fs　=　f.listFiles();
for　(int　n　=　0;　n　<　fs.length;　n )　v.add(fs[n]);
if　(!inclDirs){
v.remove(i);
i--;
}
}
}
return　v;
}
class　Writer2Stream　extends　OutputStream{
Writer　out;
Writer2Stream　(Writer　w){
super();
out　=　w;
}
public　void　write(int　i)　throws　IOException{
out.write(i);
}
public　void　write(byte[]　b)　throws　IOException{
for　(int　j=0;j<b.length;j ){
int　n=b[j];
//Convert　byte　to　ubyte
n=((n>>>4)&0xF)*16 (n&0xF);
out.write　(n);
}
}
public　void　write(byte[]　b,　int　off,　int　len)　throws　IOException{
for　(int　j　=　off;　j　<　off　 　len;　j ){
int　n=b[j];
n　=　((n>>>4)&0xF)*16 (n&0xF);
out.write(n);
}
}
}　
%>
<%
/////下载压缩文件包
Vector　v　=　expandFileList(request.getParameterValues("selfile"),　false);
if　(v.size()　==　0){
request.setAttribute("error",　"No　files　selected");
}
else{
File　dir_file　=　new　File(request.getRealPath("")　 　"/myfile/");
int　dir_l　=　dir_file.getAbsolutePath().length();
response.setContentType　("application/zip");
response.setHeader　("Content-Disposition",　"attachment;filename=\"downloadname.rar\"");
out.clearBuffer();
ZipOutputStream　zipout　=　new　ZipOutputStream(new　Writer2Stream(out));
zipout.setComment("Download　selected　files　\nas　one　WinRAR　file:\ndownloadname.rar");
zipout.setLevel(1);
for　(int　i=0;i<v.size();i ){
File　f　=　(File)v.get(i);
if　(f.canRead()){
zipout.putNextEntry(new　ZipEntry(f.getAbsolutePath().substring(dir_l 1)));
BufferedInputStream　fr　=　new　BufferedInputStream(new　FileInputStream(f));
byte　buffer[]　=　new　byte[0xffff];
int　b;
while　((b=fr.read())!=-1)　zipout.write(b);
fr.close();
zipout.closeEntry();
}
}
zipout.finish();
out.flush();
}
%>