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