public class LOGINToRegistration extends javax.swing.
JFrame {
final static String JDBC_DRIVER = "com.mysql.jdbc.Driver";
final static String DB_URL = "jdbc:mysql://localhost:3306/thirdyear";
final static String USER_NAME = "root";
final static String PASSWORD = "";
public LOGINToRegistration() {
initComponents();
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void LOGINToRegistrationActionPerformed(java.awt.event.ActionEvent evt) {
if(jTextField1.getText().length()== 0 && jPasswordField1.getPassword().length == 0 ){ // Checking for
empty field
jLabel1.setText("Empty fields detected ! Please fill up both");}
else if( jTextField1.getText().length()== 0 ) // Checking for empty field
jLabel1.setText("Empty fields detected ! Please fill up username");
else if( jPasswordField1.getPassword().length == 0 ) // Checking for empty field
jLabel1.setText("Empty fields detected ! Please fill up password");
else
{ String u = jTextField1.getText(); // Collecting the input
String p = jPasswordField1.getText();
try{
Class.forName(JDBC_DRIVER);
Connection con = DriverManager.getConnection(DB_URL ,USER_NAME,PASSWORD);
Statement stmt = con.createStatement();
String logqry = "select * from login";
ResultSet rs = stmt.executeQuery(logqry);
while(rs.next())
{ if( u.equals(rs.getString("Username"))&& p.equals(rs.getString("Password")))
this.hide();
new field().setVisible(true);
else{
jLabel1.setText("Wrong Username");
}catch (SQLException ex)
{ Logger.getLogger(DBTest_JFrame.class.getName()).log(Level.SEVERE, null, ex); } catch
(ClassNotFoundException ex) {
Logger.getLogger(LOGINToRegistration.class.getName()).log(Level.SEVERE, null, ex);
jTextField1.setText("");
jPasswordField1.setText("");
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new LOGINToRegistration().setVisible(true);
});
private void RegisterActionPerformed(java.awt.event.ActionEvent evt) {
try {
Class.forName(JDBC_DRIVER); // load driver
con = DriverManager.getConnection(DB_URL, USER_NAME, PASSWORD);
insqry = "insert into student values(?,?,?,?)";
pstmt = con.prepareStatement(insqry );
pstmt.setString( 1 , jTextField1.getText() );
pstmt.setString( 2, jTextField2.getText() );
pstmt.setString( 3, jComboBox1.getItemAt(0|1) );
pstmt.setString( 4, jTextField3.getText() );
pstmt.executeUpdate();
jTextArea1.setText(" 1 record is inserted" );
pstmt.close(); con.close();
} catch (SQLException ex) {
Logger.getLogger(field.class.getName()).log(Level.SEVERE, null, ex);
ex.printStackTrace();
} catch (ClassNotFoundException ex) {
Logger.getLogger(field.class.getName()).log(Level.SEVERE, null, ex);
private void ViewActionPerformed(java.awt.event.ActionEvent evt) {
try{
Class.forName(JDBC_DRIVER); // load driver
con = DriverManager.getConnection(DB_URL, USER_NAME, PASSWORD);
stmt = con.createStatement();
selqry = "SELECT * FROM student";
rst = stmt.executeQuery(selqry);
while(rst.next() )
{ jTextArea1.setText("\nSTUDID\tFName\tSex\tAge"+"\n\n"
+rst.getString(1) + "\t" + rst.getString(2) +
"\t" + rst.getString(3) + "\t" + rst.getInt(4));
rst.close(); stmt.close(); con.close();
}catch(Exception ex){
ex.printStackTrace();
}
///////////////////////////////////////////////////////////////////////////////////////
import java.io.*;
import java.net.*;
public class chatserver
public static void main(String [] args)throws IOException
ServerSocket sockserv = new ServerSocket(1025 );
System.out.println("Server is ready to chat....");
Socket cl = sockserv.accept();
OutputStream out = cl.getOutputStream();
PrintWriter pw = new PrintWriter(out,true);
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
InputStream in = cl.getInputStream();
BufferedReader br2 = new BufferedReader(new InputStreamReader(in));
String rxc, syc;
while(true)
{ if((rxc = br2.readLine()) != null)
System.out.println("recieve from client: "+rxc);
syc = br1.readLine();
pw.println(syc);
System.out.println("sending to client: ");
}
//////////////////////////////////////////////////////////////////////////////////////
import java.io.*;
import java.net.*;
public class chatclient
public static void main(String [] args)throws IOException
Socket cl = new Socket("localhost",1025);
OutputStream out = cl.getOutputStream();
PrintWriter pw = new PrintWriter(out,true);
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
InputStream in = cl.getInputStream();
BufferedReader br2 = new BufferedReader(new InputStreamReader(in));
System.out.println("start chatting");
String rxc, syc;
while(true)
syc = br1.readLine();
pw.println(syc);
System.out.println("sending to server: ");
if((rxc = br2.readLine()) != null)
System.out.println("recieve from server: "+rxc);
////////////////////////////////////////////////////////////////////////////////////////////
package chaptertwo;
import java.io.*;
import java.util.Scanner;
public class FileCreateAndWriteAndRead // MyFileWriter
{ public static void main(String[] args) throws IOException
{ FileOutputStream fout = new FileOutputStream("C:\\Users\\user pc\\Desktop\\year3.txt");
Scanner scan = new Scanner(System.in);
System.out.println("Please, Enter your String: ");
String str = scan.next();
//String str = "this is file writing Example";
byte xx[] = str.getBytes();
for (int i = 0; i < xx.length; i++)
fout.write(xx[i]);
}
fout.close();
System.out.println("File created");
/* To Read created file */
FileInputStream fr = new FileInputStream("filewrt.txt" );
byte b[] = new byte[fr.available()]; /*size of data with fr.available method */
fr.read(b); //reading the data from Input Stream
String ss = new String(b); //The byte type array is converted into String
System.out.println("The created is: " + ss); //Then String is printed on screen
fr.close();
