package com.wf.captcha; import java.awt.Color; import java.awt.Font; import java.io.OutputStream; /** * 验证码抽象类 * Created by 王帆 on 2018-07-27 上午 10:08. */ public abstract class Captcha extends Randoms { protected Font font = new Font("Verdana", Font.PLAIN, 32); // 字体 protected int len = 5; // 验证码随机字符长度 protected int width = 130; // 验证码显示宽度 protected int height = 48; // 验证码显示高度 private String chars = null; // 当前验证码 protected int charType = TYPE_DEFAULT; // 验证码类型,1字母数字混合,2纯数字,3纯字母 public static final int TYPE_DEFAULT = 1; // 字母数字混合 public static final int TYPE_ONLY_NUMBER = 2; // 纯数字 public static final int TYPE_ONLY_CHAR = 3; // 纯字母 /** * 生成随机验证码 * * @return 验证码字符数组 */ protected char[] alphas() { "".toLowerCase(); "".toUpperCase(); char[] cs = new char[len]; for (int i = 0; i < len; i++) { switch (charType) { case 2: cs[i] = alpha(numMaxIndex); break; case 3: cs[i] = alpha(charMinIndex, charMaxIndex); break; default: cs[i] = alpha(); } } chars = new String(cs); return cs; } /** * 给定范围获得随机颜色 * * @param fc 0-255 * @param bc 0-255 * @return 随机颜色 */ protected Color color(int fc, int bc) { if (fc > 255) fc = 255; if (bc > 255) bc = 255; int r = fc + num(bc - fc); int g = fc + num(bc - fc); int b = fc + num(bc - fc); return new Color(r, g, b); } /** * 验证码输出,抽象方法,由子类实现 * * @param os 输出流 * @return 是否成功 */ public abstract boolean out(OutputStream os); /** * 获取当前的验证码 * * @return 字符串 */ public String text() { checkAlpha(); return chars; } /** * 获取当前验证码的字符数组 * * @return 字符数组 */ public char[] textChar() { checkAlpha(); return chars.toCharArray(); } /** * 检查验证码是否生成,没有这立即生成 */ public void checkAlpha() { if (chars == null) { alphas(); // 生成验证码 } } public Font getFont() { return font; } public void setFont(Font font) { this.font = font; } public int getLen() { return len; } public void setLen(int len) { this.len = len; } public int getWidth() { return width; } public void setWidth(int width) { this.width = width; } public int getHeight() { return height; } public void setHeight(int height) { this.height = height; } public int getCharType() { return charType; } public void setCharType(int charType) { this.charType = charType; } }