package javaipscanner;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class JavaIpScanner {
/*
Example to scan ip 192.168.1.100~120
check if any ip is reachable, means connected host
*/
static final String SUB_NET = "192.168.1.";
public static void main(String[] args) {
scanHost(SUB_NET, 100, 120);
}
private static void scanHost(String subnet, int lower, int upper) {
final int timeout = 3000;
for (int i = lower; i <= upper; i++) {
String host = subnet + i;
try {
InetAddress inetAddress = InetAddress.getByName(host);
if (inetAddress.isReachable(timeout)){
System.out.println(inetAddress.getHostName()
+ " isReachable");
System.out.println(inetAddress.toString());
System.out.println("--------------------");
}
} catch (UnknownHostException ex) {
Logger.getLogger(JavaIpScanner.class.getName())
.log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(JavaIpScanner.class.getName())
.log(Level.SEVERE, null, ex);
}
}
}
}
package javaapplication14;
import java.util.Enumeration;
import java.util.Properties;
public class JavaApplication14 {
public static void main(String[] args) {
System.out.println("\nSystem Properties\n");
System.out.println("=================\n");
Properties properties = System.getProperties();
System.out.println(properties.toString());
System.out.println("\n");
Enumeration<String> prop
= (Enumeration<String>) properties.propertyNames();
while (prop.hasMoreElements()) {
String propName = prop.nextElement();
System.out.println(
propName + " : "
+ System.getProperty(propName));
}
}
}
package javadweetio;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.nio.charset.Charset;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class JavaDweetIO {
public static void main(String[] args) {
String myThing = "helloRaspberryPi_RPi2_vcgencmd";
try {
JSONObject json =
ReadJSON("http://dweet.io/get/dweets/for/" + myThing);
JSONArray jsonArray_with = json.getJSONArray("with");
for(int i=0; i<jsonArray_with.length(); i++){
JSONObject jsonObject_with = (JSONObject) jsonArray_with.get(i);
String created = jsonObject_with.getString("created");
JSONObject jsonObject_with_content =
jsonObject_with.getJSONObject("content");
Double RaspberryPi2_core_temp =
jsonObject_with_content.getDouble("RaspberryPi2_core_temp");
System.out.println(created);
System.out.println(RaspberryPi2_core_temp);
System.out.println("-----");
}
} catch (IOException | JSONException e){
System.out.println(e.toString());
}
}
public static JSONObject ReadJSON(String url)
throws IOException, JSONException {
try (InputStream inputStream = new URL(url).openStream()) {
InputStreamReader inputStreamReader =
new InputStreamReader(inputStream, Charset.forName("UTF-8"));
BufferedReader bufferedReader =
new BufferedReader(inputStreamReader);
StringBuilder jsonBody = new StringBuilder();
int singleChar;
while ((singleChar = bufferedReader.read()) != -1) {
jsonBody.append((char)singleChar);
}
JSONObject json = new JSONObject(jsonBody.toString());
return json;
}
}
}
x Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 72 (x_PutImage)
Serial number of failed request: 51
Current serial number in output stream: 55
package helloworldswing;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class HelloWorldSwing {
private static void createAndShowGUI() {
JFrame frame = new JFrame("Hello Swing@Raspberry Pi");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(400, 300));
JLabel label = new JLabel();
label.setText(
"Hello: "
+ System.getProperty("os.arch") + "/"
+ System.getProperty("os.name"));
frame.getContentPane().add(label);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
