public class IOtools {

    /**
    * 將伺服器檔案存到壓縮包中
*/
public static void zipFile(List<File> files, ZipOutputStream outputStream) throws IOException, ServletException {
        try {
            int size = files.size();
// 壓縮列表中的檔案
for (int i = 0; i < size; i++) {
                File file = (File) files.get(i);
 
zipFile(file, outputStream);
}
        } catch (IOException e) {
            throw e;
}
    }
    public static void zipFile(File inputFile, ZipOutputStream outputstream) throws IOException, ServletException {
        try {
            if (inputFile.exists()) {
                if (inputFile.isFile()) {
                    FileInputStream inStream = new 
 
FileInputStream(inputFile);
BufferedInputStream bInStream = new BufferedInputStream(inStream);
ZipEntry entry = new ZipEntry(inputFile.getName());
outputstream.putNextEntry(entry);
                    final int MAX_BYTE = 10 * 1024 * 1024; // 最大的流為10M
long streamTotal = 0; // 接受流的容量
int streamNum = 0; // 流需要分開的數量
 
int leaveByte = 0; // 檔案剩下的字元數
byte[] inOutbyte; // byte陣列接受檔案的資料
streamTotal = bInStream.available(); // 通過available方法取得流的最大字元數
streamNum = (int) Math.floor(streamTotal / MAX_BYTE); // 取得流檔案需要分開的數量
leaveByte = (int) streamTotal % MAX_BYTE; // 分開檔案之後,剩餘的數量
if (streamNum > 0) {
                        for (int j = 0; j < streamNum; ++j) {
                            inOutbyte = new byte[MAX_BYTE];
// 讀入流,儲存在byte陣列
bInStream.read(inOutbyte, 0, MAX_BYTE);
outputstream.write(inOutbyte, 0, MAX_BYTE); // 寫出流
}
                    }
                    // 寫出剩下的流資料
inOutbyte = new byte[leaveByte];
bInStream.read(inOutbyte, 0, leaveByte);
outputstream.write(inOutbyte);
outputstream.closeEntry(); // Closes the current ZIP entry
                    // and positions the stream for
                    // writing the next entry
bInStream.close(); // 關閉
inStream.close();
}
            } else {
                throw new ServletException("檔案不存在！");
}
        } catch (IOException e) {
            throw e;
}
    }

    public static void downloadFile(File file, HttpServletResponse response, boolean isDelete) {
        try {
            // 以流的形式下載檔案。
BufferedInputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));
            byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment;filename=" + new String(file.getName().getBytes("UTF-8"),"ISO-8859-1"));
toClient.write(buffer);
toClient.flush();
toClient.close();
            if(isDelete)
            {
                file.delete();        //是否將生成的伺服器端檔案刪除
}
        }
        catch (IOException ex) {
            ex.printStackTrace();
}
    }

}