From Forum Nokia Wiki

Template:ReviwerApproved The basic purpose of this article is to download and view a file.

Important Points

• One benefit of using an HttpConnection (as compared to InputStream or StreamConnection) is the availability of a method to check for the length of the remote data. The data can then be read in one fell-swoop, in contrast to reading one character/byte at a time.

• Before leaving the viewFile() method, check to the status of the input stream and the httpConnection, and close if necessary.

Sample code for client

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
 
public class FileViewer extends MIDlet implements CommandListener {
	private Display display; // Reference to Display object
	private TextBox tbViewer; // View file contents in a textbox
	private Command cmView; // Command to view file
	private Command cmExit; // Command to exit
	private String url = "http://www.corej2me.com/midpbook_v1e1/scratch/fileViewer.hlp";
 
	public FileViewer() {
		display = Display.getDisplay(this);
 
		// Define commands
		cmView = new Command("View", Command.SCREEN, 2);
		cmExit = new Command("Exit", Command.EXIT, 1);
 
		tbViewer = new TextBox("Viewer", "", 250, TextField.ANY);
		tbViewer.addCommand(cmView);
		tbViewer.addCommand(cmExit);
		tbViewer.setCommandListener(this);
	}
 
	public void startApp() {
		display.setCurrent(tbViewer);
	}
 
	private void viewFile() throws IOException {
		HttpConnection http = null;
		InputStream iStrm = null;
 
		try {
 
			http = (HttpConnection) Connector.open(url);
 
			// ----------------
			// Client Request
			// ----------------
			// 1) Send request method
			http.setRequestMethod(HttpConnection.GET);
 
			// 2) Send header information (this header is optional)
			http.setRequestProperty("User-Agent",
					"Profile/MIDP-1.0 Configuration/CLDC-1.0");
 
			// 3) Send body/data - No data for this request
 
			// ----------------
			// Server Response
			// ----------------
			// 1) Get status Line
			System.out.println("Msg: " + http.getResponseMessage());
			System.out.println("Code: " + http.getResponseCode());
 
			// 2) Get header information
			if (http.getResponseCode() == HttpConnection.HTTP_OK) {
				// 3) Get data (show the file contents)
				iStrm = http.openInputStream();
				int length = (int) http.getLength();
				if (length > 0) {
					byte serverData[] = new byte[length];
					iStrm.read(serverData);
					tbViewer.setString(new String(serverData));
				}
			}
		} finally {
 
			if (iStrm != null)
				iStrm.close();
			if (http != null)
				http.close();
		}
	}
 
	public void pauseApp() {
	}
 
	public void destroyApp(boolean unconditional) {
	}
 
	public void commandAction(Command c, Displayable s) {
		if (c == cmView) {
			try {
				viewFile();
			} catch (Exception e) {
				System.out.println(e.toString());
			}
		} else if (c == cmExit) {
			destroyApp(false);
			notifyDestroyed();
		}
	}
}