我想写一个位于Linux服务器上的java servlet,它可以被客户端用来下载视频文件。它适用于文件大小很小(可能小于2 MB)的情况,但较大的文件大小会返回错误:org.apache.catalina.connector.ClientAbortException: java.io.IOException: Broken pipe
。为什么Java servlet在文件大小大于2 MB时给ClientAbortException?
搜索Google后,当客户端断开连接时出现此错误。在我的情况下,我使用客户端,并且可以确认我没有做任何会破坏连接的事情(至少不是故意的) - 当发生此错误时,浏览器保持打开状态等。
任何想法可能会导致此(以及如何解决)?
public class GetFile extends HttpServlet {
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
}
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
String filename ="init_java";
try {
// get user parameters
filename = req.getParameter("fileId"); // complete path to video file
//res.setContentType("video/mp4"); //not working
res.setContentType("application/x-download");
File file=new File(filename);
if (file.exists()) {
res.setHeader("Content-Disposition", "inline; filename=\""+filename+"\"");
res.setHeader("Cache-Control", "cache, must-revalidate");
//res.setHeader("Pragma", "public"); // not sure when to use
returnFile(filename, res.getOutputStream());
} else {
//error handling goes here
}
} catch (Exception e) {
...
} finally {
...
}
}
private static void returnFile(String filename, OutputStream out) throws FileNotFoundException, IOException {
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(filename));
byte[] buf = new byte[4 * 1024]; // 4K buffer
int bytesRead;
while ((bytesRead = in.read(buf)) != -1) {
out.write(buf, 0, bytesRead);
}
} finally {
if (in != null) in.close();
}
}
}
UPDATE 1
我看到在mod_jk.log
文件以下错误(其从Apache Web服务器以GlassFish应用服务器的请求传送):
[info] init_jk::mod_jk.c (3383): mod_jk/1.2.40 initialized
[error] ajp_connection_tcp_get_message::jk_ajp_common.c (1313): wrong message format 0xcad5 from ::1:8009
[error] ajp_get_reply::jk_ajp_common.c (2204): (worker1) Tomcat is down or network problems. Part of the response has already been sent to the client
[info] ajp_service::jk_ajp_common.c (2673): (worker1) sending request to tomcat failed (recoverable), because of protocol error (attempt=1)
[info] ajp_process_callback::jk_ajp_common.c (2000): Writing to client aborted or client network problems
[info] ajp_service::jk_ajp_common.c (2673): (worker1) sending request to tomcat failed (unrecoverable), because of client write error (attempt=2)
[info] jk_handler::mod_jk.c (2799): Aborting connection for worker=worker1
它似乎跟踪了我所观察到的,但我不是这里的专家 - 这是否提供了对可能是什么根源的任何洞察?
尝试'.flush()'一切后,输出流已被写入其中。 – 2014-10-17 18:20:12
谢谢@FabianBarney,我在'returnFile()'中的while循环后面添加了'out.flush();'但它没有什么区别。 – user46688 2014-10-17 18:54:01
这可能是一个基础设施问题 - 例如防火墙/路由器会丢弃某种类型和持续时间的连接。 – 2014-10-17 19:17:35