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@@ -0,0 +1,121 @@
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+package com.huimv.manager.util;
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+
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+import com.huimv.manager.exception.RRException;
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+
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+import javax.imageio.ImageIO;
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+import javax.servlet.http.HttpServletRequest;
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+import javax.servlet.http.HttpServletResponse;
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+import javax.servlet.http.HttpSession;
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+import java.awt.Color;
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+import java.awt.Font;
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+import java.awt.Graphics;
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+import java.awt.image.BufferedImage;
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+import java.util.Random;
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+
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+
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+public class VerifyUtil {
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+// public static final String RANDOMCODEKEY = "RANDOMREDISKEY";//放到session中的key
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+ private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
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+ private int width = 95;// 图片宽
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+ private int height = 25;// 图片高
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+ private int lineSize = 40;// 干扰线数量
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+ private int stringNum = 4;// 随机产生字符数量
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+
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+ private Random random = new Random();
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+
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+ /**
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+ * 获得字体
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+ */
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+ private Font getFont() {
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+ return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
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+ }
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+
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+ /**
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+ * 获得颜色
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+ */
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+ private Color getRandColor(int fc, int bc) {
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+ if (fc > 255) {
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+ fc = 255;
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+ }
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+ if (bc > 255) {
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+ bc = 255;
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+ }
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+ int r = fc + random.nextInt(bc - fc - 16);
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+ int g = fc + random.nextInt(bc - fc - 14);
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+ int b = fc + random.nextInt(bc - fc - 18);
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+ return new Color(r, g, b);
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+ }
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+
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+ /**
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+ * 生成随机图片
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+ */
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+ public String getRandcode(HttpServletRequest request, HttpServletResponse response) {
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+ // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
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+ BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
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+ // 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
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+ Graphics g = image.getGraphics();
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+ //图片大小
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+ g.fillRect(0, 0, width, height);
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+ //字体大小
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+ g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));
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+ //字体颜色
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+ g.setColor(getRandColor(110, 133));
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+ // 绘制干扰线
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+ for (int i = 0; i <= lineSize; i++) {
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+ drowLine(g);
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+ }
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+ // 绘制随机字符
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+ String randomString = "";
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+ for (int i = 1; i <= stringNum; i++) {
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+ randomString = drowString(g, randomString, i);
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+ }
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+ //将生成的随机字符串保存到session中
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+// session.removeAttribute(RANDOMCODEKEY);
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+// session.setAttribute(RANDOMCODEKEY, randomString);
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+ //设置失效时间1分钟
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+// session.setMaxInactiveInterval(60);
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+ g.dispose();
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+ try {
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+ // 将内存中的图片通过流动形式输出到客户端
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+ ImageIO.write(image, "JPEG", response.getOutputStream());
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+ return randomString;
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+ } catch (Exception e) {
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+ throw new RRException("获取验证码失败!");
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+ }
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+
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+ }
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+
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+ /**
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+ * 绘制字符串
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+ */
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+ private String drowString(Graphics g, String randomString, int i) {
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+ g.setFont(getFont());
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+ g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
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+ .nextInt(121)));
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+ String rand = String.valueOf(getRandomString(random.nextInt(randString
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+ .length())));
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+ randomString += rand;
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+ g.translate(random.nextInt(3), random.nextInt(3));
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+ g.drawString(rand, 13 * i, 16);
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+ return randomString;
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+ }
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+
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+ /**
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+ * 绘制干扰线
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+ */
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+ private void drowLine(Graphics g) {
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+ int x = random.nextInt(width);
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+ int y = random.nextInt(height);
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+ int xl = random.nextInt(13);
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+ int yl = random.nextInt(15);
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+ g.drawLine(x, y, x + xl, y + yl);
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+ }
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+
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+ /**
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+ * 获取随机的字符
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+ */
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+ public String getRandomString(int num) {
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+ return String.valueOf(randString.charAt(num));
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+ }
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+}
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+
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