import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.util.Random;/** * @Description: 验证码工具类 ，可以设置背景大体颜色，验证码长度，图像内容，图像大小等等属性，最终的到一个image 对像 * @author: 007 * @CreateDate: * @version: */public class ImageUtil{ /** * 随机类 */ private Random random = new Random(); /** * 验证码值 */ private String sRandom = ""; /** * 验证码长度 */ private int imageLength = 4; /** * 随机线数量 */ private int randLineCount = 100; /** * 宽度 */ private int width = 60; /** * 长度 */ private int height = 25; /** * 验证码图像 */ private BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); /** * 获取图形上下文 */ private Graphics graphics = image.getGraphics(); /** * 字体类 */ private Font font = new Font("Times New Roman", Font.PLAIN, 18); /** * 验证码显示字符库 */ private char[] selectChar = { '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', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' }; /** * 随机线颜色起始值 */ private int lfCloor = 120; /** * 随机线颜色结束值 */ private int lbCloor = 130; /** * */ private int fCloor = 195; /** * */ private int bCloor = 205; /** * 获得验证码的值大写值 * * @return */ public String getsRandom() { return sRandom.toUpperCase(); } /** * 获取验证码图像公开方法 * * return 图像 */ public BufferedImage getImage() { DrawImage(); return image; } /** * 随机划线 */ private void drawRandomLine() { graphics.setColor(getRandColor(lfCloor, lbCloor)); for (int i = 0; i < randLineCount; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); graphics.drawLine(x, y, x + xl, y + yl); } } /** * 生成图验证码图像 * */ private void DrawImage() { // 设定背景色 graphics.setColor(getRandColor(fCloor, bCloor)); //换背景图 graphics.fillRect(0, 0, width, height); //设定字体 graphics.setFont(font); //生成随机线 drawRandomLine(); //生成随机字符 for (int i = 0; i < imageLength; i++) { int charIndex = random.nextInt(selectChar.length); String rand = "" + selectChar[charIndex]; sRandom += rand; //调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成 graphics.setColor(new Color(20 + random.nextInt(110), 40 + random.nextInt(110), 60 + random.nextInt(110))); graphics.drawString(rand, 13 * i - (random.nextInt(5) * 2) + 6, 16); } graphics.dispose(); } /** * 按给定范围产生随机颜色 * * @param 开始颜色指数 * @param 结束颜色指数 * @return 颜色对象 */ private Color getRandColor(int fc, int bc) { //给定范围获得随机颜色 Random random = new Random(); if (fc > 255) { fc = 255; } if (bc > 255) { bc = 255; } int r = fc + random.nextInt(bc - fc); int g = fc + random.nextInt(bc - fc); int b = fc + random.nextInt(bc - fc); return new Color(r, g, b); } public void setSelectChar(final char[] selectChar) { this.selectChar = selectChar; } public void setImageLength(final int imageLength) { this.imageLength = imageLength; } public void setRandLineCount(final int randLineCount) { this.randLineCount = randLineCount; } public void setWidth(final int width) { this.width = width; } public void setHeight(final int height) { this.height = height; } public void setFont(final Font font) { this.font = font; } public void setLfCloor(final int lfCloor) { this.lfCloor = lfCloor; } public void setLbCloor(final int lbCloor) { this.lbCloor = lbCloor; } public void setfCloor(final int fCloor) { this.fCloor = fCloor; } public void setbCloor(final int bCloor) { this.bCloor = bCloor; }}
