//Java实现简单验证码功能

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 = 100, height = 30;

private String str = "";

public denglu() {

setTitle("登陆窗体");

setFont(new Font("", Font.BOLD, 24));

setLayout(null);// 自定义布局

// 负责产生验证码图片

Icon icon = new ImageIcon(getCardImage(width, height));

name = new JLabel("账 号");

pass = new JLabel("密 码");

card = new JLabel("验证码");

imageCard = new JLabel(icon);

nameText = new JTextField();

passText = new JTextField();

cardText = new JTextField();

login = new JButton("登 录");

name.setBounds(80, 20, 60, 30);

pass.setBounds(80, 60, 60, 30);

card.setBounds(80, 100, 60, 30);

imageCard.setBounds(240, 100, 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);

//注册事件

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);

//生成文字

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;

}

//加入干扰点

for (int i = 0; i < 60; 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;

}

//监听类:鼠标单击时执行,即单击验证码时再次随机产生一个验证码

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();

}

}