Java生成验证码

Java版生成简易验证码:

import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;public final class ImageUtil {// 验证码字符集private static final char[] chars = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};// 字符数量private static final int SIZE = 4;// 干扰线数量private static final int LINES = 5;// 宽度private static final int WIDTH = 80;// 高度private static final int HEIGHT = 40;// 字体大小private static final int FONT_SIZE = 30;/** * 生成随机验证码及图片 */public static Object[] createImage() {StringBuffer sb = new StringBuffer();// 1.创建空白图片BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);// 2.获取图片画笔Graphics graphic = image.getGraphics();// 3.设置画笔颜色graphic.setColor(Color.LIGHT_GRAY);// 4.绘制矩形背景graphic.fillRect(0, 0, WIDTH, HEIGHT);// 5.画随机字符Random ran = new Random();for (int i = 0; i <SIZE; i++) {// 取随机字符索引int n = ran.nextInt(chars.length);// 设置随机颜色graphic.setColor(getRandomColor());// 设置字体大小graphic.setFont(new Font(null, Font.BOLD + Font.ITALIC, FONT_SIZE));// 画字符graphic.drawString(chars[n] + "", i * WIDTH / SIZE, HEIGHT / 2);// 记录字符sb.append(chars[n]);}// 6.画干扰线for (int i = 0; i < LINES; i++) {// 设置随机颜色graphic.setColor(getRandomColor());// 随机画线graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),ran.nextInt(WIDTH), ran.nextInt(HEIGHT));}// 7.返回验证码和图片return new Object[]{sb.toString(), image};}/** * 随机取色 */public static Color getRandomColor() {Random ran = new Random();Color color = new Color(ran.nextInt(256),ran.nextInt(256), ran.nextInt(256));return color;}public static void main(String[] args) throws IOException {Object[] objs = createImage();BufferedImage image = (BufferedImage) objs[1];// /home/soft01/1.pngOutputStream os = new FileOutputStream("d:/1.png");ImageIO.write(image, "png", os);os.close();}}