package com.walker.support.kaptcha;
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import com.walker.infrastructure.utils.StringUtils;
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import com.walker.web.CaptchaProvider;
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import com.walker.web.CaptchaResult;
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import com.walker.web.CaptchaType;
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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.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.util.Random;
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/**
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* 只有文字的验证码，数字或者字母。
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* @author 时克英
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* @date 2023-05-12
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*/
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public class WordCaptchaProvider implements CaptchaProvider<CaptchaResult> {
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private static final Random random = new Random();
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private final int width = 80; //图片宽度
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private final int height = 34; //图片高度
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private final int stringNum = 4; //字符的数量
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private final int lineSize = 40; //干扰线数量
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@Override
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public CaptchaResult generateCaptcha(Object param) {
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CaptchaResult captchaResult = new CaptchaResult();
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BufferedImage image = this.createImage(captchaResult);
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// captchaResult.setCode(code);
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captchaResult.setImage(image);
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return captchaResult;
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}
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@Override
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public boolean validateCaptcha(CaptchaResult data) {
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// 由业务子类继承并重写该方法完成校验，一般会把生成结果放入缓存，然后与给定的结果做对比。
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return false;
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}
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@Override
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public CaptchaType getCaptchaType() {
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return CaptchaType.InputCode;
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}
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private BufferedImage createImage(CaptchaResult captchaResult){
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Graphics Graphics = null;
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try {
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
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Graphics = image.getGraphics();// 获得BufferedImage对象的Graphics对象
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Graphics.fillRect(0, 0, width, height);//填充矩形
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Graphics.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//设置字体
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Graphics.setColor(getRandColor(110, 133));//设置颜色
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//绘制干扰线
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for(int i = 0; i <= lineSize; i++) {
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drawLine(Graphics);
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}
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//绘制字符
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String randomString = "";
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for(int i = 1; i <= stringNum; i++) {
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randomString = drawString(Graphics, randomString, i);
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captchaResult.setCode(randomString);
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}
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return image;
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} catch (Exception ex){
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ex.printStackTrace();
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return null;
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} finally {
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if(Graphics != null){
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Graphics.dispose();//释放绘图资源
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}
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}
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}
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/**
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* 绘制字符串,返回绘制的字符串
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* @param graphics 获得BufferedImage对象的Graphics对象
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* @param randomString 随机字符串
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* @param i 坐标倍数
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* @since 2020-04-16
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* @return string
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*/
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private String drawString(Graphics graphics, String randomString, int i) {
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Graphics2D g2d = (Graphics2D) graphics;
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g2d.setFont(getFont()); //设置字体
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g2d.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));//设置颜色
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String randChar = getRandomChar(random.nextInt(StringUtils.STRING_RANDOM_CHAR.length()));
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randomString += randChar; //组装
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// int rot = getRandomNum(1,10);
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int rot = Integer.parseInt(StringUtils.generateRandomNumber(1));
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// System.out.println(".......... rot = " + rot);
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g2d.translate(random.nextInt(3), random.nextInt(3));
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g2d.rotate(rot * Math.PI / 180);
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g2d.drawString(randChar, 13*i, 20);
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g2d.rotate(-rot * Math.PI / 180);
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return randomString;
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}
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private void drawLine(Graphics graphics) {
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//起点(x,y) 偏移量x1、y1
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int xl = random.nextInt(13);
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int yl = random.nextInt(15);
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graphics.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));
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graphics.drawLine(x, y, x + xl, y + yl);
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}
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private Font getFont() {
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return new Font("Fixedsys", Font.CENTER_BASELINE, 25); //名称、样式、磅值
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}
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private String getRandomChar(int index) {
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//获取指定位置index的字符，并转换成字符串表示形式
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return String.valueOf(StringUtils.STRING_RANDOM_CHAR.charAt(index));
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}
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private Color getRandColor(int frontColor, int backColor) {
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if(frontColor > 255)
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frontColor = 255;
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if(backColor > 255)
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backColor = 255;
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int red = frontColor + random.nextInt(backColor - frontColor - 16);
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int green = frontColor + random.nextInt(backColor - frontColor -14);
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int blue = frontColor + random.nextInt(backColor - frontColor -18);
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return new Color(red, green, blue);
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}
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}
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