转载自：javaweb 播放视频通过断点续传拖动滚动条

java播放视频如果需要后台处理，并不是请求xxx.mp4.当需要拖动进度条的时候部分浏览器是不行的，这里就需要断点续传。

直接上代码，通过video的src请求

/**

* video请求位置

* @param request

* @param response

*/

@RequestMapping(value = "/player", method = RequestMethod.GET)

public void player2(HttpServletRequest request, HttpServletResponse response) {

String path = request.getServletContext().getRealPath("/static/my/video/interview.mp4");

BufferedInputStream bis = null;

try {

File file = new File(path);

if (file.exists()) {

long p = 0L;

long toLength = 0L;

long contentLength = 0L;

int rangeSwitch = 0; // 0,从头开始的全文下载；1,从某字节开始的下载(bytes=27000-)；2,从某字节开始到某字节结束的下载(bytes=27000-39000)

long fileLength;

String rangBytes = "";

fileLength = file.length();

// get file content

InputStream ins = new FileInputStream(file);

bis = new BufferedInputStream(ins);

// tell the client to allow accept-ranges

response.reset();

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

// client requests a file block download start byte

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

if (range != null && range.trim().length() > 0 && !"null".equals(range)) {

response.setStatus(javax.servlet.http.HttpServletResponse.SC_PARTIAL_CONTENT);

rangBytes = range.replaceAll("bytes=", "");

if (rangBytes.endsWith("-")) { // bytes=270000-

rangeSwitch = 1;

p = Long.parseLong(rangBytes.substring(0, rangBytes.indexOf("-")));

contentLength = fileLength - p; // 客户端请求的是270000之后的字节(包括bytes下标索引为270000的字节)

} else { // bytes=270000-320000

rangeSwitch = 2;

String temp1 = rangBytes.substring(0, rangBytes.indexOf("-"));

String temp2 = rangBytes.substring(rangBytes.indexOf("-") + 1, rangBytes.length());

p = Long.parseLong(temp1);

toLength = Long.parseLong(temp2);

contentLength = toLength - p + 1; // 客户端请求的是 270000-320000 之间的字节

}

} else {

contentLength = fileLength;

}

// 如果设设置了Content-Length，则客户端会自动进行多线程下载。如果不希望支持多线程，则不要设置这个参数。

// Content-Length: [文件的总大小] - [客户端请求的下载的文件块的开始字节]

response.setHeader("Content-Length", new Long(contentLength).toString());

// 断点开始

// 响应的格式是:

// Content-Range: bytes [文件块的开始字节]-[文件的总大小 - 1]/[文件的总大小]

if (rangeSwitch == 1) {

String contentRange = new StringBuffer("bytes ").append(new Long(p).toString()).append("-")

.append(new Long(fileLength - 1).toString()).append("/")

.append(new Long(fileLength).toString()).toString();

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

bis.skip(p);

} else if (rangeSwitch == 2) {

String contentRange = range.replace("=", " ") + "/" + new Long(fileLength).toString();

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

bis.skip(p);

} else {

String contentRange = new StringBuffer("bytes ").append("0-").append(fileLength - 1).append("/")

.append(fileLength).toString();

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

}

String fileName = file.getName();

response.setContentType("application/octet-stream");

response.addHeader("Content-Disposition", "attachment;filename=" + fileName);

OutputStream out = response.getOutputStream();

int n = 0;

long readLength = 0;

int bsize = 1024;

byte[] bytes = new byte[bsize];

if (rangeSwitch == 2) {

// 针对 bytes=27000-39000 的请求，从27000开始写数据

while (readLength <= contentLength - bsize) {

n = bis.read(bytes);

readLength += n;

out.write(bytes, 0, n);

}

if (readLength <= contentLength) {

n = bis.read(bytes, 0, (int) (contentLength - readLength));

out.write(bytes, 0, n);

}

} else {

while ((n = bis.read(bytes)) != -1) {

out.write(bytes, 0, n);

}

}

out.flush();

out.close();

bis.close();

}

} catch (IOException ie) {

// 忽略 ClientAbortException 之类的异常

} catch (Exception e) {

e.printStackTrace();

}

}

在前端页面上的访问方式：