基于struts2+hibernate+spring（ssh2）的登录验证码的实现

可以显示三种不同类型的验证码而不是单独一种，显示效果如下图所示：

* 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



下面是实现的验证码类

Java代码

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;

}

}

struts2中获得验证码：

Java代码

/**

* 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

Java代码

<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; background-color:#87adbf; 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>

另外，在登录的时候，后台验证验证码是否输入正确

Java代码

public String userLogin() {

String yanzhengma = this.getYzm().toLowerCase();//将验证码字符串全部转换成小写

String random = getSessionAttribute("random").toString().toLowerCase();

if(!yanzhengma.equals(random)){

this.setRequestAttribute("errorMessage", "验证码错误，请核实后重新输入");

return INPUT;

}

else{

UserModel user = getUserService().loginJudge(getUserName(),

getUserPass());

if (user != null) {

getSession().setAttribute("user", user);

getSession().setAttribute("userId", user.getUserId());

List<PermissionModel> treeList = userService.getTree(user

.getUserId());

getRequest().setAttribute("treeList", treeList);

this.setRequestAttribute("username", user.getUserName());

user.setLastLoginTime(DateUtil.getCurrentTimestamp());

if (userService.addUser(user)) {

logger.info(getUserName() + "登录成功");

return SUCCESS;

} else {

logger.info(getUserName() + "登录失败，失败原因，更新lastLoginTime失败");

this.setRequestAttribute("errorMessage", "服务器hold不住啦，请稍后重新登录");

return INPUT;

}

} else {

logger.info(getUserName() + "登录失败，用户名或者密码不正确");

this.setRequestAttribute("errorMessage", "登录失败，用户名或者密码不正确");

return INPUT;

}

}