最近在支持moa的开发，给它们写了大概十多个接口，其中有一个接口是获取视频流。当时没做过，就直接给的是，pc端播放正常的流给moa端使用，结果对方测试反馈过来，不能播放。很蛋疼，咨询了公司大牛，寻求了帮助。首先，断点续传，要设置下头Rang，并且要规定流的长度，再设置下contenttype，根据文件后缀去做适配。最后在web.xml中配置下mine-mapping标签。
java代码：
/**
* 文件下载
* @param request
* @param response
* @param filePath
* @throws Exception
*/
@RequestMapping(value = "/getImageVideo/Users/pengcheng/test/{fileName:.+}", method = RequestMethod.GET)
public static void getImageVideo(HttpServletRequest request,
HttpServletResponse response,@PathVariable String fileName) throws Exception{
try {
BufferedInputStream bis = null;
String savePath = ConstantUtil.FILEPATH;
File file = new File(savePath + fileName);
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);
}
// MS IE5.5 有要作特别处理
//response.setContentType("video/mp4");
String contentType = "application/octet-stream";
if(fileName.indexOf(".")>1&&StringUtils.isNotBlank(fileName.substring(fileName.lastIndexOf(".")+1,fileName.length())))
{
String later = "";
if(StringUtils.isNoneBlank(fileName)) {
later = fileName.substring(fileName.lastIndexOf(".") + 1,fileName.length());
};
String mimeType = PropertyUtil.getValue(later);
contentType = StringUtils.isNotBlank(mimeType)?mimeType:contentType;
}
response.setContentType(contentType);
if (request.getHeader("User-Agent").indexOf("MSIE 5.5") != -1) {
response.setHeader("Content-Disposition", "filename=" + fileName);
} else { // 非 IE5.5 的 Header 设定方式,IE 5.5 不能加attachment
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) {
logger.error(e);
}
}
xml中，视频文件后缀适配：
mov=video/quicktime
movie=video/x-sgi-movie
mp1=audio/x-mpeg
mp2=audio/x-mpeg
mp3=audio/x-mpeg
mp4=video/mp4
mpa=audio/x-mpeg
mpe=video/mpeg
MOV=video/quicktime
MOVIE=video/x-sgi-movie
MP1=audio/x-mpeg
MP2=audio/x-mpeg
MP3=audio/x-mpeg
MP4=video/mp4
MPA=audio/x-mpeg
MPE=video/mpeg
web.xml中，配置下mine-mapping标签：
<mime-mapping>
<extension>mov</extension>
<mime-type>video/quicktime</mime-type>
</mime-mapping>
<mime-mapping>
<extension>movie</extension>
<mime-type>video/x-sgi-movie</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mp1</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mp2</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mp3</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mp4</extension>
<mime-type>video/mp4</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mpa</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>mpe</extension>
<mime-type>video/mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MOV</extension>
<mime-type>video/quicktime</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MOVIE</extension>
<mime-type>video/x-sgi-movie</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MP1</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MP2</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MP3</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MP4</extension>
<mime-type>video/mp4</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MPA</extension>
<mime-type>audio/x-mpeg</mime-type>
</mime-mapping>
<mime-mapping>
<extension>MPE</extension>
<mime-type>video/mpeg</mime-type>
</mime-mapping>
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