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- package com.dashitech.utils;
- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics;
- import java.awt.image.BufferedImage;
- import java.util.Random;
- public class CaptchaUtil2 {
- /**
- * 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;
- /**
- * 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
- * @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 textCode = generateTextCode(type, length, excludeString);
- return generateImageCode(textCode, width, height, interLine, randomLocation, backColor, foreColor, lineColor);
- }
- /**
- * 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
- * @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) {
- // 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("Default", 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;
- }
- }
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