It looks like you're reading the whole png before sending, where you
could save latency and memory for big files and have a good general
method by using the static resource servlet given here:
http://stackoverflow.com/questions/132052/servlet-for-serving-static-content
Bill
On 10/4/19 2:04 AM, Alexander Farber wrote:
Good morning,
I am using Jetty 9.4.21.v20190926 - as a standalone server behind
HAProxy and also I compile my custom WAR servlet against it.
It serves Websockets, GET, POST requests and works very well, thank you!
However now I would like to generate a PNG file using ImageIO and
while the code below works for me, I have 2 questions please -
@Override
protected void doGet(HttpServletRequest httpReq,
HttpServletResponse httpResp) throws ServletException, IOException {
if ("board1".equals(httpReq.getServletPath()) {
BufferedImage image =
ImageIO.read(getResource("ru/game_board_1.png"));
httpResp.setStatus(HttpServletResponse.SC_OK);
httpResp.setContentType("image/png");
httpResp.setContentLength(12345); // question 1: should I
call this or will Jetty add it automatically?
ImageIO.write(image, "png", httpResp.getOutputStream());
httpResp.getOutputStream().close(); // question 2: should
I close the output stream here or not?
}
}
Question 1: Should I explicitly set Content-Length or will Jetty add
it automatically for me? And if I have to set it myself, how to deal
with the changed size because of gzip compression?
Question 2: Should I call httpResp.getOutputStream().close() at the
end of doGet() or maybe the output stream is still needed to serve
other requests because of Keep-Alive?
Thank you
Alex
PS: Below is my very simple config file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE Configure PUBLIC "-//Jetty//Configure//EN"
"http://www.eclipse.org/jetty/configure_9_0.dtd";>
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
<Set name="contextPath">/ws</Set>
<Set name="war"><SystemProperty
name="jetty.base"/>/../WebSockets/target/ws-servlet-0.1-SNAPSHOT.war</Set>
</Configure>
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