基於struts2+hibernate+spring（ssh2）的登錄驗證碼的實現

本文轉載自查看原文 2012-07-09 20:39 15970

驗證碼是很多系統都需要的，今天搞了一下午終於把驗證碼的功能實現了，可以顯示三種不同類型的驗證碼而不是單獨一種，顯示效果如下圖所示：

* 第一種：簡單驗證碼，4位隨機數字：

* 第二種：英文字符加數字的驗證碼：

* 第三種：像鐵路訂票系統一樣的驗證碼，肆+？=21

下面是實現的驗證碼類

Java代碼

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;
/**
* 驗證碼類，主要生成幾種不同類型的驗證碼
* 第一種：簡單驗證碼，4位隨機數字
* 第二種：英文字符加數字的驗證碼
* 第三種：像鐵路訂票系統一樣的驗證碼，肆+？=21
*
* @author 李朋飛
*
*/
public class VerificationCodeUtil {
private ByteArrayInputStream image;// 圖像
private String str;// 驗證碼
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：獲取一個驗證碼類的實例
*
* @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：設置第一種驗證碼的屬性
*/
public void initNumVerificationCode(BufferedImage image) {
Random random = new Random(); // 生成隨機類
Graphics g = initImage(image, random);
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
// 將認證碼顯示到圖象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
g.drawString(rand, 13 * i + 6, 16);
}
this.setStr(sRand);/* 賦值驗證碼 */
// 圖象生效
g.dispose();
this.setImage(drawImage(image));
}
/**
* 功能：設置第二種驗證碼屬性
*/
public void initLetterAndNumVerificationCode(BufferedImage image) {
Random random = new Random(); // 生成隨機類
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()) {// 隨機將該字母變成小寫
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);/* 賦值驗證碼 */
g.dispose(); // 圖象生效
this.setImage(drawImage(image));
}
/**
* 功能：設置第三種驗證碼屬性即：肆+？=24
*/
public void initChinesePlusNumVerificationCode(BufferedImage image) {
String[] cn = { "壹", "貳", "叄", "肆", "伍", "陸", "柒", "捌", "玖", "拾" };
Random random = new Random(); // 生成隨機類
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("楷體", Font.PLAIN, 14));// 設定字體
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(); // 圖象生效
this.setImage(drawImage(image));
}
public Graphics initImage(BufferedImage image, Random random) {
Graphics g = image.getGraphics(); // 獲取圖形上下文
g.setColor(getRandColor(200, 250));// 設定背景色
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setFont(new Font("Times New Roman", Font.PLAIN, 14));// 設定字體
g.setColor(getRandColor(160, 200)); // 隨機產生165條干擾線，使圖象中的認證碼不易被其它程序探測到
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("驗證碼圖片產生出現錯誤：" + e.toString());
}
return input;
}
/*
* 功能：給定范圍獲得隨機顏色
*/
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：獲取驗證碼的字符串值
*
* @return
*/
public String getVerificationCodeValue() {
return this.getStr();
}
/**
* 功能：取得驗證碼圖片
*
* @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中獲得驗證碼：

Java代碼

/**
* 功能：打開login.jsp的時候獲得隨機的驗證碼圖片
*
* @return
*/
public String getRandomPictrue() {
VerificationCodeUtil vcu = VerificationCodeUtil.Instance();
this.setInputStream(vcu.getImage());
ActionContext.getContext().getSession().put("random", vcu.getVerificationCodeValue());// 取得隨機字符串放入HttpSession
return SUCCESS;
}

另外前台jsp頁面

Java代碼

<script type="text/javascript">
function changeValidateCode(obj) {
//獲取當前的時間作為參數，無具體意義
var timenow = new Date().getTime();
//每次請求需要一個不同的參數，否則可能會返回同樣的驗證碼
//這和瀏覽器的緩存機制有關系，也可以把頁面設置為不緩存，這樣就不用這個參數了。
obj.src="getRandomPictrue?d="+timenow;
}
</script>
<tr>
<td height="24" valign="bottom"><div align="right"><span class="STYLE3">驗證碼</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，在登錄的時候，后台驗證驗證碼是否輸入正確

Java代碼

public String userLogin() {
String yanzhengma = this.getYzm().toLowerCase();//將驗證碼字符串全部轉換成小寫
String random = getSessionAttribute("random").toString().toLowerCase();
if(!yanzhengma.equals(random)){
this.setRequestAttribute("errorMessage", "驗證碼錯誤，請核實后重新輸入");
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() + "登錄成功");
return SUCCESS;
} else {
logger.info(getUserName() + "登錄失敗，失敗原因，更新lastLoginTime失敗");
this.setRequestAttribute("errorMessage", "服務器hold不住啦，請稍后重新登錄");
return INPUT;
}
} else {
logger.info(getUserName() + "登錄失敗，用戶名或者密碼不正確");
this.setRequestAttribute("errorMessage", "登錄失敗，用戶名或者密碼不正確");
return INPUT;
}
}
}

分享到：

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;

/**
* 驗證碼類，主要生成幾種不同類型的驗證碼
* 第一種：簡單驗證碼，4位隨機數字
* 第二種：英文字符加數字的驗證碼
* 第三種：像鐵路訂票系統一樣的驗證碼，肆+？=21
*
* @author 李朋飛
*
*/
public class VerificationCodeUtil {
   private ByteArrayInputStream image;// 圖像
   private String str;// 驗證碼
   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：獲取一個驗證碼類的實例
   *
   * @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：設置第一種驗證碼的屬性
   */
   public void initNumVerificationCode(BufferedImage image) {

       Random random = new Random(); // 生成隨機類
       Graphics g = initImage(image, random);
       String sRand = "";
       for (int i = 0; i < 4; i++) {
           String rand = String.valueOf(random.nextInt(10));
           sRand += rand;
           // 將認證碼顯示到圖象中
           g.setColor(new Color(20 + random.nextInt(110), 20 + random
                   .nextInt(110), 20 + random.nextInt(110)));
           // 調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
           g.drawString(rand, 13 * i + 6, 16);
       }
       this.setStr(sRand);/* 賦值驗證碼 */
       // 圖象生效
       g.dispose();
       this.setImage(drawImage(image));
   }

   /**
   * 功能：設置第二種驗證碼屬性
   */
   public void initLetterAndNumVerificationCode(BufferedImage image) {

       Random random = new Random(); // 生成隨機類
       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()) {// 隨機將該字母變成小寫
                   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);/* 賦值驗證碼 */
       g.dispose(); // 圖象生效
       this.setImage(drawImage(image));
   }

   /**
   * 功能：設置第三種驗證碼屬性即：肆+？=24
   */
   public void initChinesePlusNumVerificationCode(BufferedImage image) {
       String[] cn = { "壹", "貳", "叄", "肆", "伍", "陸", "柒", "捌", "玖", "拾" };
       Random random = new Random(); // 生成隨機類
       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("楷體", Font.PLAIN, 14));// 設定字體
       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(); // 圖象生效
       this.setImage(drawImage(image));

   }

   public Graphics initImage(BufferedImage image, Random random) {
       Graphics g = image.getGraphics(); // 獲取圖形上下文
       g.setColor(getRandColor(200, 250));// 設定背景色
       g.fillRect(0, 0, WIDTH, HEIGHT);
       g.setFont(new Font("Times New Roman", Font.PLAIN, 14));// 設定字體
       g.setColor(getRandColor(160, 200)); // 隨機產生165條干擾線，使圖象中的認證碼不易被其它程序探測到
       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("驗證碼圖片產生出現錯誤：" + e.toString());
       }
       return input;
   }

   /*
   * 功能：給定范圍獲得隨機顏色
   */
   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：獲取驗證碼的字符串值
   *
   * @return
   */
   public String getVerificationCodeValue() {
       return this.getStr();
   }

   /**
   * 功能：取得驗證碼圖片
   *
   * @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;
   }
}

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