基于struts2+hibernate+spring(ssh2)的登录验证码的实现
- package com.base.util;
- import java.awt.Color;
- import java.awt.Font;
- import java.awt.Graphics;
- import java.awt.image.BufferedImage;
- import java.io.ByteArrayInputStream;
- import java.io.ByteArrayOutputStream;
- import java.util.Random;
- import javax.imageio.ImageIO;
- import javax.imageio.stream.ImageOutputStream;
- /**
- * 验证码类,主要生成几种不同类型的验证码
- * 第一种:简单验证码,4位随机数字
- * 第二种:英文字符加数字的验证码
- * 第三种:像铁路订票系统一样的验证码,肆+?=21
- *
- * @author 李朋飞
- *
- */
- public class VerificationCodeUtil {
- private ByteArrayInputStream image;// 图像
- private String str;// 验证码
- private static final int WIDTH = 80;
- private static final int HEIGHT = 20;
- public static void main(String[] arg) {
- VerificationCodeUtil vcu = VerificationCodeUtil.Instance();
- System.err.println(vcu.getVerificationCodeValue());
- }
- /**
- * 功能:获取一个验证码类的实例
- *
- * @return
- */
- public static VerificationCodeUtil Instance() {
- return new VerificationCodeUtil();
- }
- private VerificationCodeUtil() {
- BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
- BufferedImage.TYPE_INT_RGB);
- int randomNum = new Random().nextInt(3);
- if (randomNum == 0) {
- initNumVerificationCode(image);
- } else if (randomNum == 1) {
- initLetterAndNumVerificationCode(image);
- } else {
- initChinesePlusNumVerificationCode(image);
- }
- }
- /**
- * 功能:设置第一种验证码的属性
- */
- public void initNumVerificationCode(BufferedImage image) {
- Random random = new Random(); // 生成随机类
- Graphics g = initImage(image, random);
- String sRand = "";
- for (int i = 0; i < 4; i++) {
- String rand = String.valueOf(random.nextInt(10));
- sRand += rand;
- // 将认证码显示到图象中
- g.setColor(new Color(20 + random.nextInt(110), 20 + random
- .nextInt(110), 20 + random.nextInt(110)));
- // 调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成
- g.drawString(rand, 13 * i + 6, 16);
- }
- this.setStr(sRand);/* 赋值验证码 */
- // 图象生效
- g.dispose();
- this.setImage(drawImage(image));
- }
- /**
- * 功能:设置第二种验证码属性
- */
- public void initLetterAndNumVerificationCode(BufferedImage image) {
- Random random = new Random(); // 生成随机类
- Graphics g = initImage(image, random);
- String[] letter = { "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" };
- String sRand = "";
- for (int i = 0; i < 4; i++) {
- String tempRand = "";
- if (random.nextBoolean()) {
- tempRand = String.valueOf(random.nextInt(10));
- } else {
- tempRand = letter[random.nextInt(25)];
- if (random.nextBoolean()) {// 随机将该字母变成小写
- tempRand = tempRand.toLowerCase();
- }
- }
- sRand += tempRand;
- g.setColor(new Color(20 + random.nextInt(10), 20 + random
- .nextInt(110), 20 + random.nextInt(110)));
- g.drawString(tempRand, 13 * i + 6, 16);
- }
- this.setStr(sRand);/* 赋值验证码 */
- g.dispose(); // 图象生效
- this.setImage(drawImage(image));
- }
- /**
- * 功能:设置第三种验证码属性 即:肆+?=24
- */
- public void initChinesePlusNumVerificationCode(BufferedImage image) {
- String[] cn = { "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖", "拾" };
- Random random = new Random(); // 生成随机类
- Graphics g = initImage(image, random);
- int x = random.nextInt(10) + 1;
- int y = random.nextInt(30);
- this.setStr(String.valueOf(y));
- g.setFont(new Font("楷体", Font.PLAIN, 14));// 设定字体
- g.setColor(new Color(20 + random.nextInt(10), 20 + random.nextInt(110),
- 20 + random.nextInt(110)));
- g.drawString(cn[x - 1], 1 * 1 + 6, 16);
- g.drawString("+", 22, 16);
- g.drawString("?", 35, 16);
- g.drawString("=", 48, 16);
- g.drawString(String.valueOf(x + y), 61, 16);
- g.dispose(); // 图象生效
- this.setImage(drawImage(image));
- }
- public Graphics initImage(BufferedImage image, Random random) {
- Graphics g = image.getGraphics(); // 获取图形上下文
- g.setColor(getRandColor(200, 250));// 设定背景色
- g.fillRect(0, 0, WIDTH, HEIGHT);
- g.setFont(new Font("Times New Roman", Font.PLAIN, 14));// 设定字体
- g.setColor(getRandColor(160, 200)); // 随机产生165条干扰线,使图象中的认证码不易被其它程序探测到
- for (int i = 0; i < 165; i++) {
- int x = random.nextInt(WIDTH);
- int y = random.nextInt(HEIGHT);
- int xl = random.nextInt(12);
- int yl = random.nextInt(12);
- g.drawLine(x, y, x + xl, y + yl);
- }
- return g;
- }
- public ByteArrayInputStream drawImage(BufferedImage image) {
- ByteArrayInputStream input = null;
- ByteArrayOutputStream output = new ByteArrayOutputStream();
- try {
- ImageOutputStream imageOut = ImageIO
- .createImageOutputStream(output);
- ImageIO.write(image, "JPEG", imageOut);
- imageOut.close();
- input = new ByteArrayInputStream(output.toByteArray());
- } catch (Exception e) {
- System.out.println("验证码图片产生出现错误:" + e.toString());
- }
- return input;
- }
- /*
- * 功能:给定范围获得随机颜色
- */
- private Color getRandColor(int fc, int bc) {
- Random random = new Random();
- if (fc > 255)
- fc = 255;
- if (bc > 255)
- bc = 255;
- int r = fc + random.nextInt(bc - fc);
- int g = fc + random.nextInt(bc - fc);
- int b = fc + random.nextInt(bc - fc);
- return new Color(r, g, b);
- }
- /**
- * 功能:获取验证码的字符串值
- *
- * @return
- */
- public String getVerificationCodeValue() {
- return this.getStr();
- }
- /**
- * 功能:取得验证码图片
- *
- * @return
- */
- public ByteArrayInputStream getImage() {
- return this.image;
- }
- public String getStr() {
- return str;
- }
- public void setStr(String str) {
- this.str = str;
- }
- public void setImage(ByteArrayInputStream image) {
- this.image = image;
- }
- }
- /**
- * 功能:打开login.jsp的时候获得随机的验证码图片
- *
- * @return
- */
- public String getRandomPictrue() {
- VerificationCodeUtil vcu = VerificationCodeUtil.Instance();
- this.setInputStream(vcu.getImage());
- ActionContext.getContext().getSession().put("random", vcu.getVerificationCodeValue());// 取得随机字符串放入HttpSession
- return SUCCESS;
- }
另外前台jsp页面
- <script type="text/javascript">
- function changeValidateCode(obj) {
- //获取当前的时间作为参数,无具体意义
- var timenow = new Date().getTime();
- //每次请求需要一个不同的参数,否则可能会返回同样的验证码
- //这和浏览器的缓存机制有关系,也可以把页面设置为不缓存,这样就不用这个参数了。
- obj.src="getRandomPictrue?d="+timenow;
- }
- </script>
- <tr>
- <td height="24" valign="bottom"><div align="right"><span class="STYLE3">验证码</span></div></td>
- <td width="10" valign="bottom"> </td>
- <td width="52" height="24" valign="bottom"><input type="text" maxlength=4 name="yzm" id="textfield3" style="width:50px; height:17px; border:solid 1px #153966; font-size:12px; color:#283439; "></td>
- <td width="92" valign="bottom"><div align="center"><img src="getRandomPictrue.action" width="80" height="20" onclick="changeValidateCode(this)"></div></td>
- </tr>