JSP 多个文件打包下载代码

2013-08-263lian11 的分享   加三联MM小编微信好友:sanlian2018


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();  
}  
%>

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