java 文件下载Java文件下载的几种方式????public?void?downLoad(String?filePath,?HttpServletResponse?re
java 文件下载
Java文件下载的几种方式
????public?void?downLoad(String?filePath,?HttpServletResponse?response,?boolean?isOnLine)?throws?Exception?{
????????File?f?=?new?File(filePath);
????????if?(!f.exists())?{
????????????response.sendError(404,?"File?not?found!");
????????????return;
????????}
????????BufferedInputStream?br?=?new?BufferedInputStream(new?FileInputStream(f));
????????byte[]?buf?=?new?byte[1024];
????????int?len?=?0;
????????response.reset();?//?非常重要
????????if?(isOnLine)?{?//?在线打开方式
????????????URL?u?=?new?URL("file:///"?+?filePath);
????????????response.setContentType(u.openConnection().getContentType());
????????????response.setHeader("Content-Disposition",?"inline;?filename="?+?f.getName());
????????????//?文件名应该编码成UTF-8
????????}?else?{?//?纯下载方式
????????????response.setContentType("application/x-msdownload");
????????????response.setHeader("Content-Disposition",?"attachment;?filename="?+?f.getName());
????????}
????????OutputStream?out?=?response.getOutputStream();
????????while?((len?=?br.read(buf))?>?0)
????????????out.write(buf,?0,?len);
????????br.close();
????????out.close();
????}
