驗證碼是很多系統都需要的，今天搞了一下午終于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",?"叁",?"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;??

??

}??

另外前臺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">&nbsp;</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"?οnclick="changeValidateCode(this)"></div></td>??

??????????????</tr>???

另外，在登錄的時候，后臺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", "叁", "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;
?? ?}
}

轉載于:https://www.cnblogs.com/lanxuezaipiao/archive/2012/07/09/2583636.html

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