Java io生成验证码及easy-captcha实现验证码功能-蒲公英云

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.GeneralPath;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Random;
import java.util.UUID;
public class CheckDemo1 {
    public static void main(String[] args) throws Exception {
        //for (int i = 0; i < 100; i++) {
            check();
        //}
    }
    public static void check() throws Exception {
        int w = 160;
        int h = 60;
        int len = 5;
        Random rand = new Random();
        BufferedImage i = new BufferedImage(w, h, 2);
        Graphics2D g = i.createGraphics();
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_DEFAULT);
        g.setColor(new Color(251, 251, 251));
        g.fillRect(0, 0, w, h);
        Font font = new Font("宋体", Font.BOLD, 15);
        font = font.deriveFont(Font.PLAIN, 55f);
        g.setFont(font);
        String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        double radianPercent = 0D;
        for (int n = 0; n < 20; n++) {
            font = font.deriveFont(Font.PLAIN, rand.nextFloat() * 15 + 15);
            g.setFont(font);
            g.setColor(new Color(rand.nextInt(255), rand.nextInt(255), rand.nextInt(255), rand.nextInt(10) + 50));
            int x = rand.nextInt(w);
            int y = rand.nextInt(h);
            g.drawString(String.valueOf(str.charAt(rand.nextInt(str.length()))), x, y);
        }
        StringBuilder sok = new StringBuilder(len);
        g.setColor(new Color(rand.nextInt(255), rand.nextInt(255), rand.nextInt(255), rand.nextInt(25) + 220));
        for (int n = 0; n < len; n++) {
            font = font.deriveFont(Font.PLAIN, rand.nextFloat() * 35 + 30);
            g.setFont(font);
            int x = n * 32 + 5;
            int y = rand.nextInt(35) + 20;
            radianPercent = Math.PI * (rand.nextInt(35) / 180D);
            if (rand.nextBoolean()) radianPercent = -radianPercent;
            g.rotate(radianPercent, x, y);
            String sss = String.valueOf(str.charAt(rand.nextInt(str.length())));
            sok.append(sss);
            g.drawString(sss, x, y);
            g.rotate(-radianPercent, x, y);
        }
        Point[] points = {new Point(0, 0), new Point(10, 50), new Point(30, 6), new Point(60, 55), new Point(80, 3), new Point(160, 60)};
        GeneralPath path = new GeneralPath();
        path.moveTo(points[0].x, points[0].y);
        for (int i2 = 0; i2 < points.length - 1; ++i2) {
            Point sp = points[i2];
            Point ep = points[i2 + 1];
            Point c1 = new Point((sp.x + ep.x) / 2, sp.y);
            Point c2 = new Point((sp.x + ep.x) / 2, ep.y);
            path.curveTo(c1.x, c1.y, c2.x, c2.y, ep.x, ep.y);
        }
        g.setStroke(new BasicStroke(rand.nextInt(6) + 2));
        g.draw(path);
        g.setColor(new Color(rand.nextInt(255), rand.nextInt(255), rand.nextInt(255), rand.nextInt(25) + 220));
        int yy = rand.nextInt(15) + 15;// y
        int hh = rand.nextInt(20) + 10;// 高度
        int aa = rand.nextInt(60) + 20;//
// x
        for (int x = 10; x < w; x++) {
            int y = (int) (yy + hh * Math.sin(x * Math.PI / aa));
// g.drawLine(x, (int) y, x, (int) y);
            g.fillOval(x, y, 3, 3);
        }
// 输出验证码
        System.out.println(sok);
        g.dispose();
        ImageIO.write(i, "png", new File("c:/cc/" + UUID.randomUUID() + ".png"));
        Runtime run = Runtime.getRuntime();
    }
}

easy-captcha

EasyCaptcha 是一个简单易用的 Java 验证码生成工具，它提供了简单的 API 来生成和验证各种类型的验证码。

要使用 EasyCaptcha，首先你需要添加 EasyCaptcha 的依赖到你的项目中。可以通过 Maven 或 Gradle 进行添加。

在 Maven 中，你可以在 pom.xml 文件中添加以下依赖：

<dependency>
    <groupId>com.github.qcloudsms</groupId>
    <artifactId>easycaptcha</artifactId>
    <version>1.5.1</version>
</dependency>

在 Gradle 中，你可以在 build.gradle 文件的 dependencies 部分中添加以下依赖：

implementation 'com.github.qcloudsms:easycaptcha:1.5.1'

一旦你添加了 EasyCaptcha 的依赖，你就可以开始使用它了。

png类型

@RequestMapping(“/hello”)
public void hello(HttpServletResponse response) throws IOException {

// png类型
SpecCaptcha captcha = new SpecCaptcha(130, 48);
String text = captcha.text();// 获取验证码的字符
char[] chars = captcha.textChar();// 获取验证码的字符数组
System.out.println("验证码："+text);
System.out.println(chars);
// 输出验证码
captcha.out(response.getOutputStream());

}

gif类型

@RequestMapping(“/hello”)
public void hello(HttpServletResponse response) throws IOException {

// 三个参数分别为宽、高、位数
GifCaptcha gifCaptcha = new GifCaptcha(100, 48, 4);
// 设置类型：字母数字混合
gifCaptcha.setCharType(Captcha.TYPE_DEFAULT);
//获取验证码
String text = gifCaptcha.text();
System.out.println("验证码为："+text);
// 输出验证码
gifCaptcha.out(response.getOutputStream());

}

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中文类型

@RequestMapping(“/hello”)
public void hello(HttpServletResponse response) throws IOException {

// 中文类型
ChineseCaptcha captcha = new ChineseCaptcha(130, 48);
//获取验证码
String text = captcha.text();
System.out.println("验证码为："+text);
// 输出验证码
captcha.out(response.getOutputStream());

}

算术类型

@RequestMapping(“/hello”)
public void hello(HttpServletResponse response) throws IOException {

// 算术类型
ArithmeticCaptcha captcha = new ArithmeticCaptcha(130, 48);
captcha.setLen(3);  // 几位数运算，默认是两位
captcha.getArithmeticString();  // 获取运算的公式：4-9+1=?
String text = captcha.text();// 获取运算的结果：-4
System.out.println("计算结果为："+text);
// 输出验证码
captcha.out(response.getOutputStream());