java——图形验证码

文件结构

文件结构.png

1.创建一个存储验证码信息的类，用于校验，这里不做校验，这个类意义不大

import java.awt.image.BufferedImage;
public class GraphicCode {
    private BufferedImage image;

    private String code;

    public GraphicCode(BufferedImage image, String code) {
        this.image = image;
        this.code = code;
    }

    public BufferedImage getImage() {
        return image;
    }

    public void setImage(BufferedImage image) {
        this.image = image;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
}

2.创建图形验证码的生成器

public class GraphicCodeGenerator {
    //自定义4个颜色，用于随机生成背景颜色，也可以写个随机方法
    private Color[] colors = {new Color(245, 245, 245), new Color(143, 188, 143),
            new Color(122, 139, 139), new Color(122, 197, 205)};

    public GraphicCode createGraphicCode(){
        //构建图形大小
        int width = 100;
        int height = 30;
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); //TYPE_INT_RGB表示具有8位RGB颜色分量的整数像素的图像(255,255,255)。

        //获取图形上下文，创建一个随机类，后面用
        Graphics graphics = bufferedImage.getGraphics();
        Random random = new Random();

        //设置背景颜色
        graphics.setColor(colors[random.nextInt(4)]); //设置图形上下文颜色
        graphics.fillRect(0, 0, width, height); //使用图形上下文当前颜色填充图像

        //生成随机线条，给背景增加美感
        for (int i = 0; i < 5; i++){
            graphics.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));
            //(x1,y1,x2,y2)在(x1,y1)(x2,y2)间绘制线条
            graphics.drawLine(random.nextInt(width), random.nextInt(height), random.nextInt(width), random.nextInt(height));
        }

        //生成4个随机数，用于显示在图片上
        StringBuilder sb = new StringBuilder();
        graphics.setFont(new Font("Arial", Font.CENTER_BASELINE, 17)); //设置字体名称，样式，字体大小
        for (int i = 0; i < 4; i++){
            String num = String.valueOf(random.nextInt(10));
            sb.append(num);
            graphics.setColor(new Color(random.nextInt(250), random.nextInt(250), random.nextInt(250)));    
            graphics.drawString(num, width / 4 * i + 10, 20); //(要写的, x坐标, y坐标)
        }

        return new GraphicCode(bufferedImage, sb.toString());
    }
}

3.写一个控制器

import com.dfyang.graphic.graphicCode.GraphicCode;
import com.dfyang.graphic.graphicCode.GraphicCodeGenerator;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@RestController
public class IndexController {
    @GetMapping("/index")
    public void index(HttpServletRequest request, HttpServletResponse response) throws IOException {
        GraphicCodeGenerator graphicCodeGenerator = new GraphicCodeGenerator();
        GraphicCode graphicCode = graphicCodeGenerator.createGraphicCode();
        //把图片写入网页
        ImageIO.write(graphicCode.getImage(), "JPEG", response.getOutputStream());
    }
}

4.写一个html看看验证码怎么样

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>图形验证码</title>
</head>
<body>
    <img src="/index">
</body>
</html>

运行结果——

结果.png

java——图形验证码

文件结构

1.创建一个存储验证码信息的类，用于校验，这里不做校验，这个类意义不大

2.创建图形验证码的生成器

3.写一个控制器

4.写一个html看看验证码怎么样

运行结果——

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