JSP 多個檔案打包下載代碼

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現把該程式主要代碼貼下,供大家需要的時候參考下:  
 

<%@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);  }  }  }   %>  <%  /////下載壓縮檔包  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();  }  %>
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