1.代码
ValidateCodeUtil.getRandomCode();//直接调用静态方法，返回验证码对象
package com.utils;
import cn.hutool.core.util.RandomUtil;
import com.alibaba.druid.util.Base64;
import org.springframework.stereotype.Component;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.Random;
/**
* 随机验证码生成工具类
*
* @author hcx
*/
@Component
public class ValidateCodeUtil {
//验证码类，用于最后返回此对象，包含验证码图片base64和真值
private static Validate validate = null;
//随机类，用于生成随机参数
private static Random random = new Random();
//随机生成字符串的取值范围
private static String randString = "0123456789abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
//图片宽度
private static int width = 80;
//图片高度
private static int height = 34;
//字符的数量
private static int stringNum = 4;
//干扰线数量
private static int lineSize = 40;
/**
* 将构造函数私有化 禁止new创建
*
* @author hcx
* @since 2024-01-23
*/
private ValidateCodeUtil() {
super();
}
/**
* 获取随机字符
*
* @return String
* @author hcx
* @since 2024-01-23
*/
private static String getRandomChar(int index) {
//获取指定位置index的字符，并转换成字符串表示形式
return String.valueOf(randString.charAt(index));
}
/**
* 获取随机指定区间的随机数
*
* @param min (指定最小数)
* @param max (指定最大数)
* @return String
* @author hcx
* @since 2024-01-23
*/
private static int getRandomNum(int min, int max) {
return RandomUtil.randomInt(min, max);
}
/**
* 获得字体
*/
private static Font getFont() {
return new Font("Fixedsys", Font.CENTER_BASELINE, 25); //名称、样式、磅值
}
/**
* 获得颜色
*
* @param frontColor 覆盖颜色
* @param backColor 背景色
* @return Color
* @author hcx
* @since 2024-01-23
*/
private static Color getRandColor(int frontColor, int backColor) {
if (frontColor > 255)
frontColor = 255;
if (backColor > 255)
backColor = 255;
int red = frontColor + random.nextInt(backColor - frontColor - 16);
int green = frontColor + random.nextInt(backColor - frontColor - 14);
int blue = frontColor + random.nextInt(backColor - frontColor - 18);
return new Color(red, green, blue);
}
/**
* 绘制字符串,返回绘制的字符串
*
* @param graphics 获得BufferedImage对象的Graphics对象
* @param randomString 随机字符串
* @param i 坐标倍数
* @return string
* @author hcx
* @since 2024-01-23
*/
private static String drawString(Graphics graphics, String randomString, int i) {
Graphics2D g2d = (Graphics2D) graphics;
g2d.setFont(getFont()); //设置字体
g2d.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));//设置颜色
String randChar = getRandomChar(random.nextInt(randString.length()));
randomString += randChar; //组装
int rot = getRandomNum(1, 10);
g2d.translate(random.nextInt(3), random.nextInt(3));
g2d.rotate(rot * Math.PI / 180);
g2d.drawString(randChar, 13 * i, 20);
g2d.rotate(-rot * Math.PI / 180);
return randomString;
}
/**
* 绘制干扰线
*
* @param graphics 获得BufferedImage对象的Graphics对象
* @author hcx
* @since 2024-01-23
*/
private static void drawLine(Graphics graphics) {
//起点(x,y) 偏移量x1、y1
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(13);
int yl = random.nextInt(15);
graphics.setColor(new Color(random.nextFloat(), random.nextFloat(), random.nextFloat()));
graphics.drawLine(x, y, x + xl, y + yl);
}
/**
* 生成Base64图片验证码
*
* @return String
* @author hcx
* @since 2024-01-23
*/
public static Validate getRandomCode() {
validate = validate == null ? new Validate() : validate;
// BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
Graphics Graphics = image.getGraphics();// 获得BufferedImage对象的Graphics对象
Graphics.fillRect(0, 0, width, height);//填充矩形
Graphics.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//设置字体
Graphics.setColor(getRandColor(110, 133));//设置颜色
//绘制干扰线
for (int i = 0; i <= lineSize; i++) {
drawLine(Graphics);
}
//绘制字符
String randomString = "";
for (int i = 1; i <= stringNum; i++) {
randomString = drawString(Graphics, randomString, i);
validate.setValue(randomString);
}
Graphics.dispose();//释放绘图资源
ByteArrayOutputStream bs = null;
try {
bs = new ByteArrayOutputStream();
ImageIO.write(image, "png", bs);//将绘制得图片输出到流
String imgSrc = Base64.byteArrayToBase64(bs.toByteArray());
validate.setBase64Str(imgSrc);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
bs.close();
} catch (IOException e) {
e.printStackTrace();
} finally {
bs = null;
}
}
return validate;
}
/**
* 验证码类
*
* @author hcx
* @since 2024-01-23
*/
public static class Validate implements Serializable {
private static final long serialVersionUID = 1L;
private String Base64Str; //Base64 值
private String value; //验证码值
public String getBase64Str() {
return Base64Str;
}
public void setBase64Str(String base64Str) {
Base64Str = base64Str;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
}