Learning Java 4 – Swing, SQL, and Security API

Learning Java 4: Swing, SQL, Security Christopher Swenson Center for Information Security University of Tulsa 600 S. College Ave Tulsa, OK 74104

Overview
SQL
Security API
Swing

SQL
Load a runtime driver for the database you want to connect to
Class.forName(“com.microsoft.jdbc.sqlserver.SQLServerDriver”)
Make sure that the class is in your ClassPath
java.sql.DriverManager.getConnection()
Pass it a URL, name and password to connect
Get a Statement object from the connection
Use this to execute queries and updates
Tons of Exception s: catch them all

Code
Class.forName(“com.microsoft.jdbc.sqlserver.SQLServerDriver”)
Connection conn = java.sql.DriverManager.getConnection(“jdbc:microsoft:sqlserver://127.0.0.1:1433”, “sa”, “123”);
Statement stmt = conn.createStatement();

Queries / Updates
Use the Connection methods execQuery(“…”) and execUpdate(“…”)
Return ResultSet object
Queries – SELECT
rs.next() – moves one row down to the next object and returns true, or returns false when you are out of rows
rs.getObject(int i) – gets the object in the specified column number
i starts at 1
Often, columns must be accessed IN ORDER (can’t go back)
Updates
INSERT, DELETE, UPDATE
Returns number of rows affected

Code
ResultSet rs = stmt.executeQuery(“select name from person”);
while (rs.next())
{
System.out.println(rs.getObject(1));
}

Security API
Cryptography architecture, provided by Cryptographic Services
Message digest, digital signatures, key generation and management, encryption, decryption
java.security, javax.crypto
http://java.sun.com/j2se/1.5.0/docs/guide/security/CryptoSpec.html

Digest Example
MessageDigest sha = MessageDigest.getInstance("SHA-1");
sha.update(i1); sha.update(i2); sha.update(i3); byte[] hash = sha.digest();

Digest Types
MD2
MD5
SHA-1
SHA-256
SHA-384
SHA-512

Cipher Example
KeyGenerator keygen = KeyGenerator.getInstance("DES");
SecretKey desKey = keygen.generateKey();
Cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
desCipher.init(Cipher.ENCRYPT_MODE, desKey);
byte[] cleartext = "This is just an example".getBytes();
byte[] ciphertext = desCipher.doFinal(cleartext);
desCipher.init(Cipher.DECRYPT_MODE, desKey);
byte[] cleartext1 = desCipher.doFinal(ciphertext);

Cipher Types
Algorithms
AES
RC2/RC4/RC5
RSA – actually, PKCS #1
DES
DESede
Modes
NONE
CBC
CFB
ECB
OFB
PCBC
Padding
NoPadding
PKCS5Padding

RSA
Will need Bouncy Castle provider
KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
keyGen.initialize(1024);
KeyPair key = keyGen.generateKeyPair();
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, key.getPublic());
byte[] cipherText = cipher.doFinal(plainText);
cipher.init(Cipher.DECRYPT_MODE, key.getPrivate());
byte[] newPlainText = cipher.doFinal(cipherText);

Swing
Swing is a platform-independent GUI-building kit
javax.swing
Very easy to use
Most constructs are simple
Clean for most uses
Event-driven
Based on the AWT, the original GUI package for Java
java.awt

JFrame
JFrame is the basic class
Creates a window
Extend it, and override the constructor
Make a new JFrame, add stuff to it
Starts out invisible by default
JFrame f = new JFrame(“Title here”);
f.setVisible(true);

Close Window
Closing the window should exit your program, right?
Use “actions” to do this
Also for keystrokes, mouse clicks
WindowAdapter is a skeleton class to capture Window actions (like, clicking the close button)
Catches ActionEvent s, and figures out what to do with them
Also InputEvent s

Example
JFrame f = new JFrame(“Test”);
f.setVisible(true);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});

Let’s add stuff
Some basic classes to mess with
Most everything subclasses JComponent
JLabel
Text (can use simple HTML, like <b>text</b>)
JTextField
An line of text input
JButton
A clickable button
Anything implementing AbstractButton is “clickable”
JRadioButton – set a group with ButtonGroup
JProgressBar

Adding objects
Pre-Java 1.5
Container c = frame.getContentPane();
c.add(new JLabel(“Text”));
Now, just frame.add(…)
By default, uses an empty FlowLayout
Change the Layout via setLayout(…)
BorderLayout, BoxLayout, CardLayout, FlowLayout, GridBagLayout, GridLayout, SpringLayout

Layouts

Menus
JMenuBar is the bar at the top (setJMenuBar)
Add JMenus, which have JMenuItems
addMenuListener to catch stuff
menuCanceled
menuDeselected
menuSelected

Panes
JPanel – create a new container to work with
A sub-frame
Allow you to do more complicated things
JTabbedPane – tabs
Most JComponent extended objects can have borders added
setBorder(BorderFactory.createEtchedBorder(EtchedBorder.LOWERED, Color.GRAY, Color.WHITE))
setBorder(BorderFactory.createTitledBorder(“Stuff"));

Extra tips for Swing
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
Makes things more native looking
GridBagLayout
Powerful, difficult to use layout

Learning Java 4 – Swing, SQL, and Security API

by caswenson on May 17, 2009

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