CAS5.1.8自定义验证码源代码

package com.landtool.sso.support.util; import java.awt.*; import java.awt.geom.Ellipse2D; import java.util.Random; /** * 简单验证码生成 * 参考连接 https://www.cnblogs.com/lr393993507/p/5455935.html * * @version 0.1 * @auth . * @time 2018/2/25 16:10 * @since 0.1 */ public class CodeDrawUtil { private Graphics2D gp2d; private String captcha; private static Random random = new Random(); public static final int IMG_WIDTH = 100; public static final int IMG_HEIGHT = 30; /* private static final String[] code = new String[] {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"};*/ private static final String[] code = new String[] {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9"}; public CodeDrawUtil(Graphics2D gp2d) { this.gp2d = gp2d; } public String getCaptcha() { if(captcha == null){ throw new NullPointerException("验证码没有生成"); } return captcha; } /* * 获得颜色 */ private Color getRandColor(int r, int g, int b) { return new Color(random.nextInt(r), random.nextInt(g), random.nextInt(b)); } /* * 绘制图片 */ public CodeDrawUtil drawImg(int width, int height) { gp2d.fillRect(0, 0, width, height); gp2d.setColor(Color.white); return this; } /* * 绘制噪点 * */ public CodeDrawUtil drawEclipse(int number) { for (int i = 0; i < number; i++) { gp2d.setPaint(this.getRandColor(255, 255, 255)); int x = random.nextInt(100); int y = random.nextInt(50); double alpha = random.nextDouble(); gp2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, (float) alpha));// 1.0f为透明度 ，值从0-1.0，依次变得不透 gp2d.fill(new Ellipse2D.Double(x, y, 5, 5)); } return this; } /* * 绘制干扰线 */ public CodeDrawUtil drawLine(int number) { for (int i = 0; i < number; i++) { int x = random.nextInt(100); int y = random.nextInt(50); int xl = random.nextInt(100); int yl = random.nextInt(50); double alpha = random.nextDouble(); // 1.0f为透明度 ，值从0-1.0，依次变得不透 gp2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, (float) alpha)); gp2d.setPaint(this.getRandColor(255, 255, 255)); gp2d.drawLine(x, y, x + xl, y + yl); } return this; } /** * 绘制验证码 * * @param number 验证码数量 * @return */ public CodeDrawUtil drawFont(int number) { StringBuilder strCode = new StringBuilder(); for (int i = 0; i < number; i++) { double alpha = random.nextDouble()+0.6; gp2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, ((float) alpha) > 1.0F ? 1.0F : ((float) alpha)));// 1.0f为透明度 ，值从0-1.0，依次变得不透 Font font = new Font("Times New Roman", Font.BOLD, 30); gp2d.setFont(font); gp2d.setColor(getRandColor(random.nextInt(101)+1, random.nextInt(111)+1, random.nextInt(121)+1)); int x = (int) (20 * (i + 1) - random.nextInt(10)); int y = (int) (random.nextInt(10) + 20); gp2d.translate(random.nextInt(3), random.nextInt(1)); //相对位置偏移 int index = random.nextInt(code.length); String temp = code[index]; strCode.append(temp); gp2d.drawString(temp, x, y); } captcha = strCode.toString(); return this; } public void dispose(){ gp2d.dispose(); gp2d = null; } /** * 获取当前系统字体 * * @return */ private String getFontFamilyName() { GraphicsEnvironment gEnv = GraphicsEnvironment.getLocalGraphicsEnvironment(); String[] s = gEnv.getAvailableFontFamilyNames(); int index = s.length; return s[random.nextInt(index)]; } private String getFontStyle() { String[] styleNames = {"Plain", "Bold", "Italic", "Bold Italic"}; int index = styleNames.length; return styleNames[random.nextInt(index)]; } }