Make a simple picture verification code in Java

Java implementation of simple verification code function

Package project;

Import Java.awt.Color;

Import Java.awt.Font;
Import Java.awt.Graphics;
Import Java.awt.Image;
Import java.awt.event.MouseEvent;
Import Java.awt.event.MouseListener;
Import Java.awt.image.BufferedImage;

Import Javax.swing.Icon;
Import Javax.swing.ImageIcon;
Import Javax.swing.JButton;
Import Javax.swing.JFrame;
Import Javax.swing.JLabel;
Import Javax.swing.JTextField;

@SuppressWarnings ("Serial")
public class Denglu extends JFrame {

Private JLabel name, pass, card, Imagecard;
Private JTextField Nametext, Passtext, Cardtext;
Private JButton login;
private int width = n, height = 30;
Private String str = "";
Public Denglu () {
Settitle ("login form");
SetFont (New Font ("", Font.Bold, 24));
SetLayout (null);//Custom layout

Responsible for generating verification code picture
Icon icon = new ImageIcon (getcardimage (width, height));
name = new JLabel ("account");
pass = new JLabel ("password");
Card = new JLabel ("Verification Code");
Imagecard = new JLabel (icon);

Nametext = new JTextField ();
Passtext = new JTextField ();
Cardtext = new JTextField ();

Login = new JButton ("login");

Name.setbounds (80, 20, 60, 30);
Pass.setbounds (80, 60, 60, 30);
Card.setbounds (80, 100, 60, 30);
Imagecard.setbounds (+, +, width, height);

Nametext.setbounds (150, 20, 200, 30);
Passtext.setbounds (150, 60, 200, 30);
Cardtext.setbounds (150, 100, 80, 30);

Login.setbounds (120, 160, 220, 30);

Add (name);
Add (pass);
Add (card);
Add (Imagecard);

Add (Nametext);
Add (Passtext);
Add (Cardtext);

Add (login);

Registering events
Addmouselistener (New Changecard ());

SetBounds (0, 0, 450, 260);
Setlocationrelativeto (NULL);
Setdefaultcloseoperation (Jframe.exit_on_close);
SetVisible (TRUE);
}

Public Image getcardimage (int width, int height) {
BufferedImage image = new BufferedImage (width, height, bufferedimage.type_int_rgb);

Graphics g = image.getgraphics ();
int red1 = (int) (Math.random () * 256);
int green1 = (int) (Math.random () * 256);
int blue1 = (int) (Math.random () * 256);
Color C1 = new Color (red1, green1, blue1);

G.setcolor (C1);
G.fillrect (0, 0, width, height);


Generate text
int red2 = (int) (Math.random () * 256);
int green2 = (int) (Math.random () * 256);
int blue2 = (int) (Math.random () * 256);
Color C2 = new Color (red2, green2, blue2);
str = "";
for (int i = 0; i < 4; i++) {
char ch = (char) ((int) (Math.random () *26+65));
Str+=ch;
}


Adding interference points
for (int i = 0; i <; i++) {
int red11 = (int) (Math.random () *256);
int green11 = (int) (Math.random () *256);
int blue11 = (int) (Math.random () *256);

Color Color3 = new Color (red11, green11, BLUE11);
G.setcolor (COLOR3);
int x1 = (int) (Math.random () *width);
int y1 = (int) (Math.random () *height);
int x2 = (int) (Math.random () *width);
int y2 = (int) (Math.random () *height);
G.drawline (x1, y1, x2, y2);


}



G.setcolor (C2);
int x = (int) (Math.random () * (WIDTH/3));
int y = (int) (Math.random () * (HEIGHT/2) +10);
G.setfont (New Font ("", Font.Bold, 24));
g.DrawString (str, x, y);

return image;
}

Listener class: Executes when mouse clicks, that is, once again randomly generates a verification code when the verification code is clicked
Class Changecard implements mouselistener{

@Override
public void mouseclicked (MouseEvent e) {
Icon icon = new ImageIcon (getcardimage (width, height));
Imagecard.seticon (icon);
}

@Override
public void mousepressed (MouseEvent e) {
TODO auto-generated Method Stub

}

@Override
public void mousereleased (MouseEvent e) {
TODO auto-generated Method Stub

}

@Override
public void mouseentered (MouseEvent e) {
TODO auto-generated Method Stub

}

@Override

public void mouseexited (MouseEvent e) {
TODO auto-generated Method Stub

}

}

public static void Main (string[] args) {
New Denglu ();
}
}

Make a simple picture verification code in Java