图片验证码 java_java生成图片验证码

生成图片验证码可以使用 Java 的 BufferedImage 类和 Graphics 类，以下是一个简单的示例代码：

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

public class ImageCode {
    private int width = 100;  // 验证码图片的宽度
    private int height = 40;  // 验证码图片的高度
    private int codeCount = 4;  // 验证码字符个数
    private int lineCount = 20;  // 干扰线数量
    private String code = null;  // 验证码
    private BufferedImage buffImg = null;  // 验证码图片

    private char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M',
            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n',
            'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            '2', '3', '4', '5', '6', '7', '8', '9'};

    public ImageCode() {
        createImageCode();
    }

    public void createImageCode() {
        int x = 0, fontHeight = 0, codeY = 0;
        int red = 0, green = 0, blue = 0;
        x = width / (codeCount + 2);
        fontHeight = height - 5;
        codeY = height - 8;

        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = buffImg.createGraphics();
        Random random = new Random();
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width / 8);
            int ye = ys + random.nextInt(height / 8);
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawLine(xs, ys, xe, ye);
        }

        StringBuilder randomCode = new StringBuilder();
        for (int i = 0; i < codeCount; i++) {
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            randomCode.append(strRand);
        }
        code = randomCode.toString();
    }

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code;
    }
}

使用时可以直接调用 `ImageCode` 类的 `getBuffImg` 方法获取生成的验证码图片，调用 `getCode` 方法获取验证码字符串。例如：

ImageCode imageCode = new ImageCode();
BufferedImage buffImg = imageCode.getBuffImg();
String code = imageCode.getCode();