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com.gitee.huanminabc.utils_common.media.img.ImageVerificationCode Maven / Gradle / Ivy
package com.gitee.huanminabc.utils_common.media.img;
import com.gitee.huanminabc.utils_common.base.UniversalException;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
/**
* 生成4位数的验证码 可以自行修改
*/
public class ImageVerificationCode {
public static void ini(HttpServletRequest request, HttpServletResponse response){
//服务器通知浏览器不要缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setHeader("expires","0");
// 验证码图片的宽度。
int width = 60;
// 验证码图片的高度。
int height = 20;
// 验证码字符个数
int codeCount = 4;
int x = 0;
// 字体高度
int fontHeight;
int codeY;
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', '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' };
x = width / (codeCount + 1);
fontHeight = height - 2;
codeY = height - 4;
BufferedImage buffImg = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
// 创建一个随机数生成器类
Random random = new Random();
// 将图像填充为白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 创建字体,字体的大小应该根据图片的高度来定。
Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
// 设置字体。
g.setFont(font);
// 画边框。
// g.setColor(Color.BLACK);
// g.drawRect(0, 0, width - 1, height - 1);
// 随机产生干扰线,使图象中的认证码不易被其它程序探测到。
// 干扰线颜色
Color[] colors={
Color.BLACK,
Color.white,
Color.lightGray,
Color.blue,
Color.green,
Color.pink,
Color.ORANGE,
Color.CYAN,
Color.magenta,
Color.darkGray
};
for (int i = 0; i < 4; i++) { //生产几条干扰线
int i1 = random.nextInt(10);
g.setColor(colors[i1]);
int x2 = random.nextInt(width);
int y2 = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x2, y2, x + xl, y2 + yl);
}
// randomCode用于保存随机产生的验证码,以便用户登录后进行验证。
StringBuffer randomCode = new StringBuffer();
int red = 0, green = 0, blue = 0;
// 随机产生codeCount数字的验证码。
for (int i = 0; i < codeCount; i++) {
// 得到随机产生的验证码数字。
String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
// 产生随机的颜色分量来构造颜色值,这样输出的每位数字的颜色值都将不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
// 用随机产生的颜色将验证码绘制到图像中。
g.setColor(new Color(red, green, blue));
g.drawString(strRand, (i + 1) * x, codeY);
// 将产生的四个随机数组合在一起。
randomCode.append(strRand);
}
// 将四位数字的验证码保存到Session中。
request.getSession().setAttribute("validateCode", randomCode.toString());
ServletOutputStream sos;
try {
sos = response.getOutputStream();
ImageIO.write(buffImg, "jpg", sos);
sos.close();
} catch (IOException e) {
UniversalException.logError(e);
}
}
}