319 lines
8.7 KiB
Java
319 lines
8.7 KiB
Java
package com.wf.captcha.base;
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import java.awt.*;
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import java.awt.geom.CubicCurve2D;
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import java.awt.geom.QuadCurve2D;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.util.Base64;
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/**
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* 验证码抽象类
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* Created by 王帆 on 2018-07-27 上午 10:08.
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*/
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public abstract class Captcha extends Randoms {
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// 常用颜色
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public static final int[][] COLOR = {{0, 135, 255}, {51, 153, 51}, {255, 102, 102}, {255, 153, 0}, {153, 102, 0}, {153, 102, 153}, {51, 153, 153}, {102, 102, 255}, {0, 102, 204}, {204, 51, 51}, {0, 153, 204}, {0, 51, 102}};
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// 验证码文本类型
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public static final int TYPE_DEFAULT = 1; // 字母数字混合
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public static final int TYPE_ONLY_NUMBER = 2; // 纯数字
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public static final int TYPE_ONLY_CHAR = 3; // 纯字母
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public static final int TYPE_ONLY_UPPER = 4; // 纯大写字母
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public static final int TYPE_ONLY_LOWER = 5; // 纯小写字母
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public static final int TYPE_NUM_AND_UPPER = 6; // 数字大写字母
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// 内置字体
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public static final int FONT_1 = 0;
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public static final int FONT_2 = 1;
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public static final int FONT_3 = 2;
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public static final int FONT_4 = 3;
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public static final int FONT_5 = 4;
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public static final int FONT_6 = 5;
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public static final int FONT_7 = 6;
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public static final int FONT_8 = 7;
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public static final int FONT_9 = 8;
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public static final int FONT_10 = 9;
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private static final String[] FONT_NAMES = new String[]{"actionj.ttf", "epilog.ttf", "fresnel.ttf", "headache.ttf", "lexo.ttf", "prefix.ttf", "progbot.ttf", "ransom.ttf", "robot.ttf", "scandal.ttf"};
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private Font font = null; // 验证码的字体
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protected int len = 5; // 验证码随机字符长度
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protected int width = 130; // 验证码显示宽度
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protected int height = 48; // 验证码显示高度
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protected int charType = TYPE_DEFAULT; // 验证码类型
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protected String chars = null; // 当前验证码
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/**
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* 生成随机验证码
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*
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* @return 验证码字符数组
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*/
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protected char[] alphas() {
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char[] cs = new char[len];
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for (int i = 0; i < len; i++) {
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switch (charType) {
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case 2:
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cs[i] = alpha(numMaxIndex);
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break;
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case 3:
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cs[i] = alpha(charMinIndex, charMaxIndex);
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break;
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case 4:
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cs[i] = alpha(upperMinIndex, upperMaxIndex);
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break;
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case 5:
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cs[i] = alpha(lowerMinIndex, lowerMaxIndex);
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break;
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case 6:
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cs[i] = alpha(upperMaxIndex);
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break;
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default:
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cs[i] = alpha();
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}
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}
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chars = new String(cs);
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return cs;
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}
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/**
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* 给定范围获得随机颜色
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*
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* @param fc 0-255
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* @param bc 0-255
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* @return 随机颜色
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*/
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protected Color color(int fc, int bc) {
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if (fc > 255)
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fc = 255;
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if (bc > 255)
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bc = 255;
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int r = fc + num(bc - fc);
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int g = fc + num(bc - fc);
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int b = fc + num(bc - fc);
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return new Color(r, g, b);
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}
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/**
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* 获取随机常用颜色
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*
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* @return 随机颜色
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*/
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protected Color color() {
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int[] color = COLOR[num(COLOR.length)];
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return new Color(color[0], color[1], color[2]);
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}
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/**
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* 验证码输出,抽象方法，由子类实现
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*
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* @param os 输出流
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* @return 是否成功
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*/
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public abstract boolean out(OutputStream os);
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/**
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* 输出base64编码
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*
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* @return base64编码字符串
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*/
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public abstract String toBase64();
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/**
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* 获取图片类型
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*
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* @return 图片格式，MIME类型
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*/
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public abstract String getContentType();
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/**
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* 输出base64编码
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*
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* @param type 编码头
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* @return base64编码字符串
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*/
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public String toBase64(String type) {
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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out(outputStream);
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return type + Base64.getEncoder().encodeToString(outputStream.toByteArray());
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}
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/**
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* 获取当前的验证码
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*
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* @return 字符串
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*/
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public String text() {
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checkAlpha();
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return chars;
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}
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/**
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* 获取当前验证码的字符数组
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*
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* @return 字符数组
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*/
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public char[] textChar() {
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checkAlpha();
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return chars.toCharArray();
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}
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/**
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* 检查验证码是否生成，没有则立即生成
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*/
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public void checkAlpha() {
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if (chars == null) {
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alphas(); // 生成验证码
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}
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}
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/**
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* 随机画干扰线
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*
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* @param num 数量
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* @param g Graphics2D
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*/
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public void drawLine(int num, Graphics2D g) {
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drawLine(num, null, g);
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}
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/**
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* 随机画干扰线
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*
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* @param num 数量
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* @param color 颜色
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* @param g Graphics2D
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*/
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public void drawLine(int num, Color color, Graphics2D g) {
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for (int i = 0; i < num; i++) {
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g.setColor(color == null ? color() : color);
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int x1 = num(-10, width - 10);
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int y1 = num(5, height - 5);
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int x2 = num(10, width + 10);
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int y2 = num(2, height - 2);
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g.drawLine(x1, y1, x2, y2);
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}
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}
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/**
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* 随机画干扰圆
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*
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* @param num 数量
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* @param g Graphics2D
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*/
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public void drawOval(int num, Graphics2D g) {
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drawOval(num, null, g);
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}
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/**
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* 随机画干扰圆
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*
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* @param num 数量
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* @param color 颜色
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* @param g Graphics2D
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*/
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public void drawOval(int num, Color color, Graphics2D g) {
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for (int i = 0; i < num; i++) {
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g.setColor(color == null ? color() : color);
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int w = 5 + num(10);
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g.drawOval(num(width - 25), num(height - 15), w, w);
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}
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}
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/**
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* 随机画贝塞尔曲线
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*
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* @param num 数量
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* @param g Graphics2D
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*/
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public void drawBesselLine(int num, Graphics2D g) {
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drawBesselLine(num, null, g);
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}
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/**
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* 随机画贝塞尔曲线
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*
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* @param num 数量
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* @param color 颜色
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* @param g Graphics2D
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*/
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public void drawBesselLine(int num, Color color, Graphics2D g) {
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for (int i = 0; i < num; i++) {
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g.setColor(color == null ? color() : color);
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int x1 = 5, y1 = num(5, height / 2);
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int x2 = width - 5, y2 = num(height / 2, height - 5);
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int ctrlx = num(width / 4, width / 4 * 3), ctrly = num(5, height - 5);
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if (num(2) == 0) {
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int ty = y1;
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y1 = y2;
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y2 = ty;
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}
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if (num(2) == 0) { // 二阶贝塞尔曲线
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QuadCurve2D shape = new QuadCurve2D.Double();
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shape.setCurve(x1, y1, ctrlx, ctrly, x2, y2);
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g.draw(shape);
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} else { // 三阶贝塞尔曲线
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int ctrlx1 = num(width / 4, width / 4 * 3), ctrly1 = num(5, height - 5);
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CubicCurve2D shape = new CubicCurve2D.Double(x1, y1, ctrlx, ctrly, ctrlx1, ctrly1, x2, y2);
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g.draw(shape);
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}
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}
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}
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public Font getFont() {
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if (font == null) {
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try {
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setFont(FONT_1);
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} catch (Exception e) {
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setFont(new Font("Arial", Font.BOLD, 32));
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}
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}
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return font;
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}
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public void setFont(Font font) {
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this.font = font;
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}
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public void setFont(int font) throws IOException, FontFormatException {
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setFont(font, 32f);
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}
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public void setFont(int font, float size) throws IOException, FontFormatException {
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setFont(font, Font.BOLD, size);
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}
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public void setFont(int font, int style, float size) throws IOException, FontFormatException {
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this.font = Font.createFont(Font.TRUETYPE_FONT, getClass().getResourceAsStream("/" + FONT_NAMES[font])).deriveFont(style, size);
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}
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public int getLen() {
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return len;
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}
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public void setLen(int len) {
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this.len = len;
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}
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public int getWidth() {
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return width;
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}
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public void setWidth(int width) {
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this.width = width;
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}
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public int getHeight() {
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return height;
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}
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public void setHeight(int height) {
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this.height = height;
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}
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public int getCharType() {
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return charType;
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}
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public void setCharType(int charType) {
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this.charType = charType;
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}
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}
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