Hello,
I hope I can ask this question in this forum. So, I am trying to
create client and servlet apps. Basically what I want to do is:
1. Client reads image file into byte[], then sends it via post request
to the servlet.
2. Servlet will do something to this byte[], and sends it back to the
client. For testing purpose, I just send back directly.
3. Client gets the byte[] and save it as image file.
As my servlet doesn't do anything to the byte[], I should have got the
same image file as a result. But I got only java exception - not a
jpeg file. And if I print the resulting byte[], it doesn't give me the
exact value as the input.
Here is the code in client app.
File img = new File("catavatare.jpg");
FileInputStream fis = null;
try {
fis = new FileInputStream(img);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buf = null;
buf = new byte[fis.available()];
for (int readNum; (readNum = fis.read(buf)) != -1;) {
bos.write(buf, 0, readNum);
}
byte[] bytes = bos.toByteArray(); //this is the byte[]
of the image
String paramStr = null;
paramStr = URLEncoder.encode(new String(bytes), "UTF-8");
URL url = new
URL("http://localhost:8080/ImageFilter/imagefilter";);
HttpURLConnection conn = (HttpURLConnection)
url.openConnection();
conn.connect();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
OutputStreamWriter out = new
OutputStreamWriter(conn.getOutputStream());
out.write(paramStr); //write the parameter to the request body
out.flush();
InputStream in = conn.getInputStream();
byte[] ins = new byte[in.available()];
in.read(ins); //write the resulting byte[]
/* the rest of the code is to save the resulting
byte[] as image file */
ByteArrayInputStream bis = new ByteArrayInputStream(ins);
Iterator<?> readers =
ImageIO.getImageReadersByFormatName("jpeg");
ImageReader reader = (ImageReader) readers.next();
Object source = bis;
ImageInputStream iis = ImageIO.createImageInputStream(source);
reader.setInput(iis, true);
ImageReadParam param = reader.getDefaultReadParam();
Image image = reader.read(0, param);
BufferedImage bufferedImage = new
BufferedImage(image.getWidth(null), image.getHeight(null),
BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = bufferedImage.createGraphics();
g2.drawImage(image, null, null);
File imageFile = new File("catavatare2.jpg");
ImageIO.write(bufferedImage, "jpg", imageFile);
System.out.println(imageFile.getPath());
The code in servlet app:
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
ServletInputStream in = req.getInputStream();
byte[] imgOld = new byte[in.available()];
in.read(imgOld);
in.close();
resp.setContentType("image/jpeg");
ServletOutputStream out = resp.getOutputStream();
out.write(imgOld); //write the input byte[] into
output stream - send it back without doing anything
out.flush();
out.close();
}
I would really appreciate if anyone gives me a hint on this. Thanks!!
--
You received this message because you are subscribed to the Google
Groups "Java EE (J2EE) Programming with Passion!" group.
To post to this group, send email to
java-ee-j2ee-programming-with-passion@googlegroups.com
To unsubscribe from this group, send email to
java-ee-j2ee-programming-with-passion+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/java-ee-j2ee-programming-with-passion?hl=en?hl=en
