文件下载

//下载
$('#dasyszTable').on('click', '.download', function (e) {
	
	var nRow = $(this).parents('tr')[0];
	var aData = dasyszTable.fnGetData(nRow);
	//插入日志
	handleInsertRecord("进入法律、法规制度列表--附件下载");
	
	var myform = $("<form></form>");
	myform.attr('method','post');
	myform.attr('action',BASEPATH + "flfgsysz/downloadFile");
	
	var file1 = $(this).find("a").eq(0).context.innerHTML;
	var fileName = $("<input type='hidden' name='fileName' />");
	fileName.attr('value',file1+","+aData.disc+","+aData.num);
	
	myform.append(fileName);
	myform.appendTo('body').submit();
});

@ResponseBody
@RequestMapping(value = "/downloadFile", method = RequestMethod.POST)
public void downloadFile(HttpServletRequest request, HttpServletResponse response) throws Exception {
	
	String fileName = request.getParameter("fileName");
	String[] split = fileName.split(",");
	String filePath = AddressUtil.getUpload_address() + split[1] + "\\" + split[2] + "_" + split[0];
	// 读到流中
	InputStream inStream = new FileInputStream(filePath);// 文件的存放路径
	// 设置输出的格式
	response.reset();
	response.setContentType("bin");
	response.setContentType("application/octet-stream; charset=utf-8");
	
	fileName = URLEncoder.encode(split[0], "UTF-8");
	if (fileName.length() > 150) {  
		String guessCharset = "gb2312"; /*根据request的locale 得出可能的编码，中文操作系统通常是gb2312*/  
		fileName = new String(fileName.getBytes(guessCharset), "ISO8859-1");   
	}  
	response.setHeader("Content-Disposition", "attachment; filename=" + fileName);  
	
	// 循环取出流中的数据
	byte[] b = new byte[100];
	int len;
	try {
		while ((len = inStream.read(b)) > 0)
			response.getOutputStream().write(b, 0, len);
		inStream.close();
	} catch (IOException e) {
		e.printStackTrace();
	}
}