Servlet uses a javax.servlet.http.HttpServletResponse object to return data to the client request. How do you use it to return the following types of data? a. Text data b. Binary data
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Can you please post the code of what you have tried? Have you looked at the documentation online?xlm– xlm2014-05-11 15:17:39 +00:00Commented May 11, 2014 at 15:17
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1 Answer
Change the content type of the response and the content itself of the response.
For text data:
response.setContentType("text/plain");
response.getWriter().write("Hello world plain text response.");
response.getWriter().close();
For binary data ,usually for file downloading (code adapted from here):
response.setContentType("application/octet-stream");
BufferedInputStream input = null;
BufferedOutputStream output = null;
try {
//file is a File object or a String containing the name of the file to download
input = new BufferedInputStream(new FileInputStream(file));
output = new BufferedOutputStream(response.getOutputStream());
//read the data from the file in chunks
byte[] buffer = new byte[1024 * 4];
for (int length = 0; (length = input.read(buffer)) > 0;) {
//copy the data from the file to the response in chunks
output.write(buffer, 0, length);
}
} finally {
//close resources
if (output != null) try { output.close(); } catch (IOException ignore) {}
if (input != null) try { input.close(); } catch (IOException ignore) {}
}
