/**

* 文件下载

* @param request

* @param response

*/

@RequestMapping(params = "viewFile")

public void viewFile(HttpServletRequest request, HttpServletResponse response) {

InputStream bis = null;

BufferedOutputStream bos = null;

long fileLength = 0;

try {

File filePic = new File(filePath);

fileLength = filePic.length();

if(filePic.exists()){

bis = new BufferedInputStream(new FileInputStream(filePath+"/"+realPath));

if(extend.equals("mp4")) {

response.setContentType("video/mp4"); // 设置返回的文件类型

}else if(extend.equals("mp3")){

response.setContentType("audio/mp3");

}

response.setHeader("Content-disposition", "attachment; filename=" + new String((attachment.getAttachmenttitle()+"."+attachment.getExtend()).getBytes("GBK"), "ISO8859-1"));

response.setHeader("Accept-Ranges", "bytes");

long pos = 0;

long epos = fileLength-1;

if (null != request.getHeader("Range")) {

// 断点续传

response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT);

try {

String rangeString = request.getHeader("Range");

rangeString = StringUtils.substringAfter(rangeString,"bytes=");

String s = StringUtils.substringBefore(rangeString, "-");

if(org.apache.commons.lang3.StringUtils.isNotBlank(s)){

pos = Long.parseLong(s);

}else

pos = -1;

String e = StringUtils.substringAfter(rangeString, "-");

if(org.apache.commons.lang3.StringUtils.isNotBlank(e)){

epos = Long.parseLong(e);

}

} catch (NumberFormatException e) {

}

StringBuffer contentRange = new StringBuffer("bytes ");

contentRange.append(pos + "").append("-").append(epos+"");

contentRange.append("/").append(fileLength+"");

response.setHeader("Content-Range", contentRange.toString());

response.setHeader("Content-Length", String.valueOf(epos-pos+1));

bis.skip(pos);

}

if(epos-pos+1 >0){

byte[] buff = new byte[(int)(epos-pos+1)];//缓冲

bos = new BufferedOutputStream(response.getOutputStream());// 得到向客户端输出二进制数据的对象

int readBytes = bis.read(buff, 0, buff.length);

bos.write(buff, 0, readBytes);

}

}

}catch(Exception e){

e.printStackTrace();

}finally{

try {

if (bis != null) {

bis.close();

}

if (bos != null) {

bos.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}