javax.servlet.*

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How to Use ServletOutputStream – for Servlet Download zip file into response Client?

Description / Answer:

from the tomcat.apache.org lib descriptions – Provides an output stream for sending binary data to the client.
is an abstract class that the servlet container implements. Subclasses of this class must implement the java.io.OutputStream.write(int) method.
method that are regularly used are : .write() – writing what the client request and paste to servlet response client.
Its use to attached the Output Stream to download on browser.

example program – Servlet Class :

ServletOutputStream servletOutputStream = null;
FileInputStream fileInputStream = null;
filename = “documentInput.Zip“;

try {
File file = new File(“C://documents/temp/tempfile.zip“);
fileInputStream = new FileInputStream(file);
servletOutputStream = response.getOutputStream();

// download using browser client – change to byte
response.setContentType(“application/zip“);
response.setContentLength((int)f.length());
response.addHeader(“Content-Disposition“,”attachment;filename=\“” + filename + “\””);
byte[] arBytes = new byte[32768];

int count;
while ((count = fileInputStream.read(arBytes)) > 0)
{
servletOutputStream.write(arBytes, 0, count);
}

}catch (IException e) {
// TODO: handle exception
} finally{
servletOutputStream.flush();
fileInputStream.close();
}