package com.bonus.core; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.Random; public class VerifyCodeHelper { /** * 验证码类型为仅数字,即0~9 */ public static final int TYPE_NUM_ONLY = 0; /** * 验证码类型为仅字母,即大小写字母混合 */ public static final int TYPE_LETTER_ONLY = 1; /** * 验证码类型为数字和大小写字母混合 */ public static final int TYPE_ALL_MIXED = 2; /** * 验证码类型为数字和大写字母混合 */ public static final int TYPE_NUM_UPPER = 3; /** * 验证码类型为数字和小写字母混合 */ public static final int TYPE_NUM_LOWER = 4; /** * 验证码类型为仅大写字母 */ public static final int TYPE_UPPER_ONLY = 5; /** * 验证码类型为仅小写字母 */ public static final int TYPE_LOWER_ONLY = 6; /* public static final String FONT_TYPE_DEFAULT="Default"; public static final String FONT_TYPE_TIMES_NEW_ROMAN="Times New Roman";*/ private VerifyCodeHelper() { } /** * 生成随机颜色 */ private static Color generateRandomColor() { Random random = new Random(); return new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)); } /** * 生成图片验证码 * * @param type 验证码类型,参见本类的静态属性 * @param length 验证码字符长度,要求大于0的整数 * @param excludeString 需排除的特殊字符 * @param width 图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度) * @param height 图片高度 * @param interLine 图片中干扰线的条数 * @param randomLocation 每个字符的高低位置是否随机 * @param backColor 图片颜色,若为null则表示采用随机颜色 * @param foreColor 字体颜色,若为null则表示采用随机颜色 * @param lineColor 干扰线颜色,若为null则表示采用随机颜色 * @param FontType 字体类型 * @return 图片缓存对象 */ public static BufferedImage generateImageCode(int type, int length, String excludeString, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor,String fontType) { String textCode = generateTextCode(type, length, excludeString); return generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor, lineColor,fontType); } /** * 生成验证码字符串 * * @param type 验证码类型,参见本类的静态属性 * @param length 验证码长度,要求大于0的整数 * @param excludeString 需排除的特殊字符(无需排除则为null) * @return 验证码字符串 */ public static String generateTextCode(int type, int length, String excludeString) { if (length <= 0) { return ""; } StringBuffer verifyCode = new StringBuffer(); int i = 0; Random random = new Random(); switch (type) { case TYPE_NUM_ONLY: while (i < length) { int t = random.nextInt(10); //排除特殊字符 if (null == excludeString || excludeString.indexOf(t + "") < 0) { verifyCode.append(t); i++; } } break; case TYPE_LETTER_ONLY: while (i < length) { int t = random.nextInt(123); if ((t >= 97 || (t >= 65 && t <= 90)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; case TYPE_ALL_MIXED: while (i < length) { int t = random.nextInt(123); if ((t >= 97 || (t >= 65 && t <= 90) || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; case TYPE_NUM_UPPER: while (i < length) { int t = random.nextInt(91); if ((t >= 65 || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; case TYPE_NUM_LOWER: while (i < length) { int t = random.nextInt(123); if ((t >= 97 || (t >= 48 && t <= 57)) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; case TYPE_UPPER_ONLY: while (i < length) { int t = random.nextInt(91); if ((t >= 65) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; case TYPE_LOWER_ONLY: while (i < length) { int t = random.nextInt(123); if ((t >= 97) && (null == excludeString || excludeString.indexOf((char) t) < 0)) { verifyCode.append((char) t); i++; } } break; } return verifyCode.toString(); } /** * 已有验证码,生成验证码图片 * * @param textCode 文本验证码 * @param width 图片宽度(注意此宽度若过小,容易造成验证码文本显示不全,如4个字符的文本可使用85到90的宽度) * @param height 图片高度 * @param interLine 图片中干扰线的条数 * @param randomLocation 每个字符的高低位置是否随机 * @param backColor 图片颜色,若为null则表示采用随机颜色 * @param foreColor 字体颜色,若为null则表示采用随机颜色 * @param lineColor 干扰线颜色,若为null则表示采用随机颜色 * @param FontType 字体类型 * @return 图片缓存对象 */ public static BufferedImage generateImageCode(String textCode, int width, int height, int interLine, boolean randomLocation, Color backColor, Color foreColor, Color lineColor,String FontType) { //创建内存图像 BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); //获取图形上下文 Graphics graphics = bufferedImage.getGraphics(); //画背景图 graphics.setColor(null == backColor ? generateRandomColor() : backColor); graphics.fillRect(0, 0, width, height); //画干扰线 Random random = new Random(); if (interLine > 0) { int x = 0, y = 0, x1 = width, y1 = 0; for (int i = 0; i < interLine; i++) { graphics.setColor(null == lineColor ? generateRandomColor() : lineColor); y = random.nextInt(height); y1 = random.nextInt(height); graphics.drawLine(x, y, x1, y1); } } //字体大小为图片高度的80% int fsize = (int) (height * 0.8); int fx = height - fsize; int fy = fsize; //设定字体 graphics.setFont(new Font("".equals(FontType)?"Default":FontType, Font.PLAIN, fsize)); //写验证码字符 for (int i = 0; i < textCode.length(); i++) { fy = randomLocation ? (int) ((Math.random() * 0.3 + 0.6) * height) : fy; graphics.setColor(null == foreColor ? generateRandomColor() : foreColor); //将验证码字符显示到图象中 graphics.drawString(textCode.charAt(i) + "", fx, fy); fx += fsize * 0.9; } graphics.dispose(); return bufferedImage; } }