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|
imports...
public class NetworkMonitor extends JPanel implements Runnable {
private ArrayList<String> lines;
public NetworkMonitor() {
lines = new ArrayList<String>();
new Thread(this).start();
}
@Override
public void run() {
try {
while (true) {
String sContents = readFile();
StringTokenizer tok = new StringTokenizer(sContents, "\n");
lines = new ArrayList<String>();
int x = 0;
while (tok.hasMoreTokens()) {
String line = tok.nextToken();
if (x++ < 2) {//skip headers
continue;
}
lines.add(line);
}
repaint();
Thread.sleep(500);//half a second
}
} catch (Exception exc) {
exc.printStackTrace();
}
}
@Override
public void paint(Graphics gr) {
super.paint(gr);
Graphics2D g = (Graphics2D) gr;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setFont(new Font(Font.DIALOG_INPUT, Font.PLAIN, 14));
g.drawString("Interface: receivedBytes/receivedPackets, sentBytes/sentPackets", 10, 20);
for (int i = 0; i < lines.size(); i++) {
drawLine(g, lines.get(i), i);
}
}
private static final String readFile() {
try {
File file = new File("/proc/net/dev");
StringBuilder sb = new StringBuilder();
byte[] bytes = new byte[1024];
int read = 0;
InputStream in = new FileInputStream(file);
while ((read = in.read(bytes)) != -1) {
sb.append(new String(bytes, 0, read));
}
in.close();
return sb.toString();
} catch (Exception exc) {
exc.printStackTrace();
}
return null;
}
private void drawLine(Graphics2D g, String line, int iLineIndex) {
String[] words = line.split("\\s+");
String sInterface = words[words[0].length() > 0 ? 0 : 1];
int index = sInterface.indexOf(':');
boolean jump = index != sInterface.length()-1;
String receivedBytes = jump ? sInterface.substring(index+1) : words[2];
String receivedPackets = jump ? words[2] : words[3];
String sentBytes = jump ? words[9] : words[10];
String sentPackets = jump ? words[10] : words[11];
if(index > -1) {
sInterface = sInterface.substring(0, index);
}
int x = 10, y = 50 + iLineIndex * 20;
String sReceived = receivedBytes + "/" + receivedPackets;
String sSent = sentBytes + "/" + sentPackets;
g.drawString(sInterface + ":", x, y);
g.drawString(sReceived, x+100, y);
g.drawString(sSent, x+250, y);
}
} |
