【发布时间】：2012-01-25 08:58:24
【问题描述】：
下面给出的代码用于视频流。这对 IE9 和 firefox 很好，但对 Chrome 和 Mac Safari 就不好了。
import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class VideoStreamServlet
*/
public class VideoStreamServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public VideoStreamServlet() {
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String range = request.getHeader("range");
String browser = request.getHeader("User-Agent");
System.out.println(browser);
if(browser.indexOf("Firefox") != -1){
System.out.println("==========ITS FIREFOX=============");
byte[] data = getBytesFromFile(new File("D:/media/final.ogg"));
response.setContentType("video/ogg");
response.setContentLength(data.length);
response.setHeader("Content-Range", range + Integer.valueOf(data.length-1));
response.setHeader("Accept-Ranges", "bytes");
response.setHeader("Etag", "W/\"9767057-1323779115364\"");
byte[] content = new byte[1024];
BufferedInputStream is = new BufferedInputStream(new ByteArrayInputStream(data));
OutputStream os = response.getOutputStream();
while (is.read(content) != -1) {
//System.out.println("... write bytes");
os.write(content);
}
is.close();
os.close();
}
else if(browser.indexOf("Chrome") != -1){
System.out.println("==========ITS Chrome=============");
byte[] data = getBytesFromFile(new File("D:/media/final.mp4"));
String diskfilename = "final.mp4";
response.setContentType("video/mp4");
//response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment; filename=\"" + diskfilename + "\"" );
System.out.println("data.length " + data.length);
response.setContentLength(data.length);
response.setHeader("Content-Range", range + Integer.valueOf(data.length-1));
response.setHeader("Accept-Ranges", "bytes");
response.setHeader("Etag", "W/\"9767057-1323779115364\"");
byte[] content = new byte[1024];
BufferedInputStream is = new BufferedInputStream(new ByteArrayInputStream(data));
OutputStream os = response.getOutputStream();
while (is.read(content) != -1) {
//System.out.println("... write bytes");
os.write(content);
}
is.close();
os.close();
}
else if(browser.indexOf("MSIE") != -1) {
System.out.println("==========ITS IE9=============");
byte[] data = getBytesFromFile(new File("D:/media/final.mp4"));
String diskfilename = "final.mp4";
response.setContentType("video/mpeg");
//response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment; filename=\"" + diskfilename + "\"" );
System.out.println("data.length " + data.length);
response.setContentLength(data.length);
response.setHeader("Content-Range", range + Integer.valueOf(data.length-1));
response.setHeader("Accept-Ranges", "text/x-dvi");
response.setHeader("Etag", "W/\"9767057-1323779115364\"");
byte[] content = new byte[1024];
BufferedInputStream is = new BufferedInputStream(new ByteArrayInputStream(data));
OutputStream os = response.getOutputStream();
while (is.read(content) != -1) {
//System.out.println("... write bytes");
os.write(content);
}
is.close();
os.close();
}
else if( browser.indexOf("CoreMedia") != -1) {
System.out.println("============ Safari=============");
byte[] data = getBytesFromFile(new File("D:/media/final.mp4"));
String diskfilename = "final.mp4";
response.setContentType("video/mpeg");
//response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment; filename=\"" + diskfilename + "\"" );
System.out.println("data.length " + data.length);
//response.setContentLength(data.length);
//response.setHeader("Content-Range", range + Integer.valueOf(data.length-1));
// response.setHeader("Accept-Ranges", " text/*, text/html, text/html;level=1, */* ");
// response.setHeader("Etag", "W/\"9767057-1323779115364\"");
byte[] content = new byte[1024];
BufferedInputStream is = new BufferedInputStream(new ByteArrayInputStream(data));
OutputStream os = response.getOutputStream();
while (is.read(content) != -1) {
//System.out.println("... write bytes");
os.write(content);
}
is.close();
os.close();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
private static byte[] getBytesFromFile(File file) throws IOException {
InputStream is = new FileInputStream(file);
//System.out.println("\nDEBUG: FileInputStream is " + file);
// Get the size of the file
long length = file.length();
//System.out.println("DEBUG: Length of " + file + " is " + length + "\n");
/*
* You cannot create an array using a long type. It needs to be an int
* type. Before converting to an int type, check to ensure that file is
* not loarger than Integer.MAX_VALUE;
*/
if (length > Integer.MAX_VALUE) {
System.out.println("File is too large to process");
return null;
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while ( (offset < bytes.length)
&&
( (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) ) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely read file " + file.getName());
}
is.close();
return bytes;
}
}
【问题讨论】：
-
一些注意事项：您所做的不是“流式传输”，您只是通过 HTTP 像其他任何方式一样提供文件；在服务器级别处理不同的浏览器是一个非常糟糕的主意（通常应该尽可能少地完成）；您应该只将每种情况不同的 2-3 行分开，而不是复制所有代码。
标签： java html jakarta-ee servlets video