2020-09-30日报博客-周三

1.学到的东西：

验证码程序：使用Swing生成窗口

package HomeWork1;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.swing.*;

public class VerificationCode {
    private static int width = 90;
    private static int height = 20;
    private static int codeCount = 4;
    private static int xx = 15;

    private static int fontHeight = 18;
    private static int codeY = 16;
    private static char[] codeSequence = {'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'};

    public static void main(String[] args) throws Exception {
        File image = new File("D://img/" + System.currentTimeMillis() + ".jpg");
        OutputStream out = new FileOutputStream(image, true);
        Map<String, Object> map = VerificationCode.generateCodeAndPic();
        ImageIO.write((RenderedImage) map.get("codePic"), "jpeg", out);
        String answer = map.get("code").toString();

        //System.out.println("验证码的值为：" + map.get("code"));

        ImageIcon icon = new ImageIcon(image.getPath());
        Image image1 = icon.getImage();

        Object input = JOptionPane.showInputDialog(null, "请输入验证码", "Java验证码校验程序", 0, icon, null, "");

        String inputAnswer = (String) input;

        if (answer.equals(inputAnswer)) {
            JOptionPane.showMessageDialog(null, "恭喜你，输入正确！", "正确了！", JOptionPane.INFORMATION_MESSAGE);
        }else{
            JOptionPane.showMessageDialog(null, "很遗憾，输入错误！", "输错了！", JOptionPane.INFORMATION_MESSAGE);
        }
    }

    public static Map<String, Object> generateCodeAndPic() {
        BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics gd = buffImg.getGraphics();
        Random random = new Random();

        gd.setColor(Color.WHITE);
        gd.fillRect(0, 0, width, height);

        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        gd.setFont(font);

        gd.setColor(Color.BLACK);
        gd.drawRect(0, 0, width - 1, height - 1);

        gd.setColor(Color.BLACK);
        for (int i = 0; i < 30; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            gd.drawLine(x, y, x + xl, y + yl);
        }

        StringBuffer randomCode = new StringBuffer();
        int red = 0, green = 0, blue = 0;

        for (int i = 0; i < codeCount; i++) {
            String code = String.valueOf(codeSequence[random.nextInt(36)]);

            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);

            gd.setColor(new Color(red, green, blue));
            gd.drawString(code, (i + 1) * xx, codeY);

            randomCode.append(code);
        }
        Map<String, Object> map = new HashMap<String, Object>();

        map.put("code", randomCode);

        map.put("codePic", buffImg);
        return map;
    }
}

2.遇到的问题：

3.明日计划：继续学习Java