Java实现中文算数验证码的实现示例(算数运算+-*/)

为了防止，页面向数据库暴力注册入力，用户登录暴力破解，所以加入验证码，验证码无法被软件获取上边的内容(加入算数计算，更加安全)，所以在现在技术，暂时安全。

先看效果图：

第一次加载比较慢，防止无法加载验证码显示，后台获取准备好的默认正在加载图片(静态图片)，后台图片获取好后，替代。

验证码效果图：

后台Java图片实现类VerificationCodeTool：

package com.tsXs.fileshare.tools; import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.util.HashMap;import java.util.Map;import java.util.Random;import org.apache.log4j.Logger; /** * * ClassName: VerificationCodeTool <br/> * Description: creat verification code <br/> * Date: 2015-3-3 下午08:37:55 <br/> * <br/> * * @author yptian@aliyun.com * * first made * @version 1.0.0<br/> * */public class VerificationCodeTool {//LOGprivate static final Logger LOG =Logger.getLogger(VerificationCodeTool.class);//verification code image widthprivate static final int IMG_WIDTH=146;//verification code image heightprivate static final int IMG_HEIGHT=30;//The number of interference linesprivate static final int DISTURB_LINE_SIZE = 15;//generate a random numberprivate Random random = new Random();//resultprivate int xyresult;//result random stringprivate String randomString;//Chinese Numbers//private static final String [] CNUMBERS = '零,一,二,三,四,五,六,七,八,九,十'.split(',');//零一二三四五六七八九十乘除加减//Here, must be java Unicode codeprivate static final String CVCNUMBERS = 'u96F6u4E00u4E8Cu4E09u56DBu4E94u516Du4E03u516Bu4E5Du5341u4E58u9664u52A0u51CF';//Definition of drawings in the captcha characters font, font name, font style, font size//static final font : In Chinese characters garbledprivate final Font font = new Font('黑体', Font.BOLD, 18);//data operatorprivate static final Map<String, Integer> OPMap = new HashMap<String, Integer>();static{OPMap.put('*', 11);OPMap.put('/', 12);OPMap.put('+', 13);OPMap.put('-', 14);}/** * The generation of image verification code * */public BufferedImage drawVerificationCodeImage(){//imageBufferedImage image = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, BufferedImage.TYPE_INT_RGB);//In memory to create a brushGraphics g = image.getGraphics();//Set the brush color//g.setColor(getRandomColor(200,250));g.setColor(Color.WHITE);//Fill the background color, using the current brush colour changing background color images//The meaning of the four parameters respectively, starting x coordinates, starting y, width, height.//image backgroundg.fillRect(0, 0, IMG_WIDTH, IMG_HEIGHT);//Set the brush colorg.setColor(getRandomColor(200,250));//image borderg.drawRect(0, 0, IMG_WIDTH-2, IMG_HEIGHT-2);//Set disturb line color g.setColor(getRandomColor(110, 133)); //Generate random interference linesfor(int i =0;i < DISTURB_LINE_SIZE; i++){drawDisturbLine1(g);drawDisturbLine2(g);}//Generate a random number, set return datagetRandomMathString();LOG.info('验证码 : '+randomString);LOG.info('验证码结果 : '+xyresult);//The generated random string used to save the systemStringBuffer logsu = new StringBuffer();for(int j=0,k = randomString.length(); j < k; j++){ int chid = 0; if(j==1){ chid = OPMap.get(String.valueOf(randomString.charAt(j))); }else{ chid = Integer.parseInt(String.valueOf(randomString.charAt(j))); } String ch = String.valueOf(CVCNUMBERS.charAt(chid)); logsu.append(ch); drawRandomString((Graphics2D)g,ch, j);}//= ?drawRandomString((Graphics2D)g,'u7B49u4E8EuFF1F', 3);logsu.append('u7B49u4E8E uFF1F');LOG.info('汉字验证码 : '+logsu);randomString = logsu.toString();//Release the brush objectg.dispose();return image;}/** * Get a random string * */private void getRandomMathString(){//Randomly generated number 0 to 10int xx = random.nextInt(10);int yy = random.nextInt(10);//save getRandomStringStringBuilder suChinese = new StringBuilder();//random 0,1,2int Randomoperands = (int) Math.round(Math.random()*2);//multiplicationif(Randomoperands ==0){this.xyresult = yy * xx;//suChinese.append(CNUMBERS[yy]);suChinese.append(yy);suChinese.append('*');suChinese.append(xx);//division, divisor cannot be zero, Be divisible}else if(Randomoperands ==1){if(!(xx==0) && yy%xx ==0){this.xyresult = yy/xx;suChinese.append(yy);suChinese.append('/');suChinese.append(xx);}else{this.xyresult = yy + xx;suChinese.append(yy);suChinese.append('+');suChinese.append(xx);}//subtraction}else if(Randomoperands ==2){this.xyresult = yy - xx;suChinese.append(yy);suChinese.append('-');suChinese.append(xx);//add}else{this.xyresult = yy + xx;suChinese.append(yy);suChinese.append('+');suChinese.append(xx);}this.randomString = suChinese.toString();}/** * Draw a random string * @param g Graphics * @param randomString random string * @param i the random number of characters * */public void drawRandomString(Graphics2D g,String randomvcch,int i){//Set the string font styleg.setFont(font);//Set the color stringint rc = random.nextInt(255);int gc = random.nextInt(255);int bc = random.nextInt(255);g.setColor(new Color(rc, gc, bc));//random string//Set picture in the picture of the text on the x, y coordinates, random offset valueint x = random.nextInt(3);int y = random.nextInt(2);g.translate(x, y);//Set the font rotation angleint degree = new Random().nextInt() % 15;//Positive point of viewg.rotate(degree * Math.PI / 180, 5+i*25, 20);//Character spacing is set to 15 px//Using the graphics context of the current font and color rendering by the specified string for a given text.//The most on the left side of the baseline of the characters in the coordinate system of the graphics context (x, y) location//str- to draw string.x - x coordinate.y - y coordinate.g.drawString(randomvcch, 5+i*25, 20);//Reverse Angleg.rotate(-degree * Math.PI / 180, 5+i*25, 20);}/** *Draw line interference *@param g Graphics * */public void drawDisturbLine1(Graphics g){int x1 = random.nextInt(IMG_WIDTH);int y1 = random.nextInt(IMG_HEIGHT);int x2 = random.nextInt(13);int y2 = random.nextInt(15);//x1 - The first point of the x coordinate.//y1 - The first point of the y coordinate//x2 - The second point of the x coordinate.//y2 - The second point of the y coordinate.//X1 and x2 is the starting point coordinates, x2 and y2 is end coordinates.g.drawLine(x1, y1, x1 + x2, y1 + y2);}/** *Draw line interference *@param g Graphics * */public void drawDisturbLine2(Graphics g){int x1 = random.nextInt(IMG_WIDTH);int y1 = random.nextInt(IMG_HEIGHT);int x2 = random.nextInt(13);int y2 = random.nextInt(15);//x1 - The first point of the x coordinate.//y1 - The first point of the y coordinate//x2 - The second point of the x coordinate.//y2 - The second point of the y coordinate.//X1 and x2 is the starting point coordinates, x2 and y2 is end coordinates.g.drawLine(x1, y1, x1 - x2, y1 - y2);}/** * For random color * @param fc fc * @param bc bc * @return color random color * */public Color getRandomColor(int fc,int bc){if(fc > 255){fc = 255;}if(bc > 255){bc = 255;}//Generate random RGB trichromaticint r = fc+random.nextInt(bc -fc - 16);int g = fc+random.nextInt(bc - fc - 14);int b = fc+random.nextInt(bc - fc - 18);return new Color(r, g, b);} /** * xyresult.<br/> * * @return the xyresult <br/> * */public int getXyresult() {return xyresult;} /** * randomString.<br/> * * @return the randomString <br/> * */ public String getRandomString() { return randomString; }}

生产静态验证码(为了防止，加载慢，空白显示)：

package com.tsXs.fileshare.tools; import java.awt.Color;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream; import javax.imageio.ImageIO;import javax.swing.ImageIcon;import javax.swing.filechooser.FileSystemView; import org.apache.log4j.Logger; import com.tsXs.fileshare.configuration.properties.StaticConstants; /** * ClassName: ImageTool <br/> * Description: get BufferedImage creat image<br/> * Date: 2015-3-10 下午05:05:38 <br/> * <br/> * * @author yptian@aliyun.com * * first made * @version 1.0.0<br/> * */public class ImageTool {//LOGprivate static final Logger LOG = Logger.getLogger(ImageTool.class);//image private BufferedImage image; /** * createImage : out dest path for image * @param fileLocation dest path */ private void createImage(String fileLocation) {try { FileOutputStream fos = new FileOutputStream(fileLocation); BufferedOutputStream bos = new BufferedOutputStream(fos); ImageIO.write(image, 'png', bos);// com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(bos); // encoder.encode(image); bos.flush(); bos.close(); LOG.info('@2'+fileLocation+'图片生成输出成功'); } catch (Exception e) { LOG.info('@2'+fileLocation+'图片生成输出失败',e); } } /** * createFileIconImage ：create share file list icon * @param destOutPath create file icon save dictory */ public void createFileIconImage(String destOutPath){ //get properties operate tool PropertiesTool propertiesTool = PropertiesTool.getInstance(StaticConstants.SHARE_FILE_CONFGURATION_PROPERTIES_PATH); //get share file root path String shareFileRootPath = propertiesTool.getPropertiesValue('FileShareRootPath'); //root dictory File rootDictory = new File(shareFileRootPath); //child file list File [] fileList = rootDictory.listFiles(); //child list files File file = null; if(fileList != null && fileList.length>0){ LOG.info('分享文件根目录下文件数:'+fileList.length); for(int i = 0,j = fileList.length;i < j;i++){ String fileName = fileList[i].getName(); String fileAllName = shareFileRootPath +fileName; file = new File(fileAllName); //get file system icon ImageIcon fileIcon = (ImageIcon) FileSystemView.getFileSystemView().getSystemIcon(file); image = (BufferedImage) fileIcon.getImage(); if(image != null){ LOG.info('@1'+fileName+'文件的图标获取成功'); } Graphics g = image.getGraphics(); g.drawImage(image, 0, 0, null); String fileNameX = fileName.substring(0,fileName.lastIndexOf('.')); //out image to dest createImage(destOutPath+''+fileNameX+'.png'); LOG.info('@3'+fileName+'文件的图标生成成功'); } } } /** * creatDefaultVerificationCode ：create default verification code * @param destOutPath create creatDefaultVerificationCode save dictory */ public void creatDefaultVerificationCode(String destOutPath){ //verification code image height //comment to com.tss.fileshare.tools.VerificationCodeTool 65 row,please int imgwidth=146; int imgheight=30; int disturblinesize = 15; VerificationCodeTool vcTool = new VerificationCodeTool(); //default verification code image = new BufferedImage(imgwidth, imgheight, BufferedImage.TYPE_INT_RGB);Graphics g = image.getGraphics();g.setColor(Color.WHITE);g.fillRect(0, 0, 146, 30);g.setColor(vcTool.getRandomColor(200,250));g.drawRect(0, 0, imgwidth-2, imgheight-2);for(int i =0;i < disturblinesize; i++){vcTool.drawDisturbLine1(g);vcTool.drawDisturbLine2(g);}//玩命加载中…String defaultVCString = 'u73A9u547Du52A0u8F7Du4E2Du2026';String dfch = null;for(int i = 0;i < 6;i++){dfch = String.valueOf(defaultVCString.charAt(i));vcTool.drawRandomString((Graphics2D)g, dfch, i);}LOG.info('默然验证码生成成功');//Graphics gvc = imagevc.getGraphics();createImage(destOutPath+'defaultverificationcode.jpeg'); } /** * graphicsGeneration : create image * @param imgurl display picture url . eg:F:/imagetool/7.jpg<br/> * @param imageOutPathName image out path+naem .eg:F:imagetooldrawimage.jpg<br/> * @param variableParmeterLength ; int, third parameter length.<br/> * @param drawString variableParmeterLength ;String [] .<br/> */ public void graphicsGeneration(String imgurl,String imageOutPathName,int variableParmeterLength,String...drawString) { //The width of the picture int imageWidth = 500; //The height of the picture int imageHeight = 400; image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);Graphics graphics = image.getGraphics();graphics.setColor(Color.WHITE); //drawing image graphics.fillRect(0, 0, imageWidth, imageHeight);graphics.setColor(Color.BLACK);//draw string string , left margin,top margin for(int i = 0,j = variableParmeterLength;i < j;i++){ graphics.drawString(drawString[i], 50, 10+15*i); } //draw image url ImageIcon imageIcon = new ImageIcon(imgurl); //draw image , left margin,top margin //The coordinates of the top left corner as the center(x,y)[left top angle] //Image observer :If img is null, this method does not perform any action graphics.drawImage(imageIcon.getImage(), 200, 0, null); createImage(imageOutPathName); } public BufferedImage getImage() {return image;}public void setImage(BufferedImage image) {this.image = image;}}

服务器，启动的时候，调用一次，生成默认图片到服务器“/servertempdictory/fileicon/”目录下：

//create default verification code String fileIconDictory = serverPath+'servertempdictoryfileicon';imageTool.creatDefaultVerificationCode(fileIconDictory);

生成动态验证码，并保存值到session中(此处有登录和注册的分路，这个读者可忽略，走一条既可)：

/** * creat verification code * */ public void verificationcode(){ //response HttpServletResponse response = ServletActionContext.getResponse(); //request HttpServletRequest request = ServletActionContext.getRequest(); //verification code demander String vCdemander = request.getParameter('vcdemander'); try{ //set encoding request.setCharacterEncoding('utf-8'); response.setContentType('text/html;charset=utf-8'); //Verification code tool VerificationCodeTool vcTool = new VerificationCodeTool(); BufferedImage image = vcTool.drawVerificationCodeImage(); //Verification code result int vcResult = vcTool.getXyresult(); String vcValue = vcTool.getRandomString();//Set ban cache //Cache-control : Specify the request and response following caching mechanism //no-cache: Indicates a request or response message cannot cache response.setHeader('Cache-Control', 'no-cache'); //Entity header field response expiration date and time are given response.setHeader('Pragma', 'No-cache'); response.setDateHeader('Expires', 0); // Set the output stream content format as image format response.setContentType('image/jpeg'); //session //true: if the session exists, it returns the session, or create a new session. //false: if the session exists, it returns the session, otherwise it returns null. HttpSession session=request.getSession(true); //set verificationcode to session //login if('userlogin'.equals(vCdemander)){ session.setAttribute('verificationcodeuserlogin',vcResult); } //regiser if('userregister'.equals(vCdemander)){ session.setAttribute('verificationcodeuserregister',vcResult); } //To the output stream output imageImageIO.write(image, 'JPEG', response.getOutputStream());LOG.info('获取验证码成功 :n验证码:'+vcValue+'n验证码结果:'+vcResult);} catch (Exception e) {LOG.error('获取验证码失败',e);} }

用struts2实现，所以配置文件struts.xml：

<!-- Set whether to support dynamic method calls, true to support, false does not support. --><constant name='struts.enable.DynamicMethodInvocation' value='true' /><!-- The suffix specified request --><constant name='struts.action.extension' value='do,go,tsXs,action'></constant><!-- user operation [first login server,server initialize]--><package name='user' namespace='/fileshare' extends='struts-default'><!-- user operate ; The wildcard method call--><action name='user*' method='{1}'><result name='success'>/view/common/message.jsp</result><result name='error'>/view/userLogin.jsp</result></action></package>

页面jsp显示代码：

<tr> <td width='100'> <span class='hint'>*[验证码]:只能输入数字和负号'-'</span> </td></tr><tr> <td width='100'> <label for='userRegPassWord'>验证码</label> <input type='text' name='verificationcodereg' tabindex='3' maxlength='3' value='' οnblur='checkuserverificationcode(this);' οnkeypress='return (/[d-]/.test(String.fromCharCode(event.keyCode)));' /> <span id='usvcmsg'></span> <input type='hidden' value='' /> </td></tr><tr> <td width='140'> <div id='refreshvc'> <span οnclick='refreshvc();' style='padding-left: 49px;cursor: pointer;'><img src='https://www.haobala.com/bcjs/${pageContext.request.contextPath}/servertempdictory/fileicon/defaultverificationcode.jpeg' /> <span style='height: 30px;width: 16px;padding-left: 4px;'><img src='https://www.haobala.com/bcjs/image/refreshvc.png' /></span> <span style='font-size: 12px;color:#2c629e; width: 20px;'>换一张</span> </span> </div> </td></tr>

在js中用正则，保证只能输入，最多3位，可以在数字前输入一个'-',即onkeypress保证只能输入数字和'-':

var userverificationcoderegex = /^(-{0,1}d+){1,3}$/;if(userverificationcoderegex.test(userverificationcode)){.....

jsp图片效果：

js动态刷新验证码：

$(document).ready(function(){//load verificatino coderefreshvc();});//refresh verification codefunction refreshvc(){var path = $('#contextPath').val();var refreshvcurl =path+'/fileshare/userverificationcode.tsXs?vcdemander=userregister&time='+new Date();$('#verificationcodeimg').attr('src',refreshvcurl);}

验证码验证：

/** * checkverificationcode : check verification code equals */ public void checkverificationcode(){ //request HttpServletRequest request = ServletActionContext.getRequest(); //response HttpServletResponse response = ServletActionContext.getResponse(); //output stream PrintWriter out = null; //session HttpSession session = request.getSession(); //verification code from client String vcclient = null; //verification code from server String vcserver = null; //verification code demander String vCdemander = request.getParameter('vcdemander'); //check verification code to clien flag String checktoclienflag = null; try{ //get verificationcode to session //login if('userlogin'.equals(vCdemander)){ vcclient = request.getParameter('vclogincode'); vcserver = String.valueOf(session.getAttribute('verificationcodeuserlogin')); } //regiser if('userregister'.equals(vCdemander)){ vcclient = request.getParameter('vcregcode'); vcserver = String.valueOf(session.getAttribute('verificationcodeuserregister')); } vcclient = UserController.encodingconvert(vcclient); vcclient = vcclient == null ? '' : vcclient; if(vcclient.equals(vcserver)){ checktoclienflag = 'vcok'; }else{ checktoclienflag = 'vcwrong'; } //set no cache,content type ,encoding response.setHeader('Cache-Control', 'no-cache'); response.setContentType('text/html'); response.setCharacterEncoding('GBK'); //output stream out = response.getWriter(); out.print(checktoclienflag); LOG.info('验证码：vcclient: '+vcclient+'vcserver: '+vcserver+'验证顺利'); }catch (Exception e) { LOG.error('vcclient: '+vcclient+'vcserver: '+vcserver+'验证失败',e); }finally{ out.flush(); out.close(); } }

properties辅助类：

/** * Copyright (c) 2015,TravelSky. * All Rights Reserved. * TravelSky CONFIDENTIAL * * Project Name:filesharetss * Package Name:com.tss.fileshare.controller.tools * File Name:PropertiesFileOperation.java * Date:2015-2-27 下午05:30:05 * */package com.tsXs.fileshare.tools; import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.Enumeration;import java.util.Properties; import org.apache.log4j.Logger; /** * * ClassName: PropertiesFileOperationTool <br/> * Description: inner class Properties file operation <br/> * Date: 2015-2-27 下午05:10:52 <br/> * <br/> * * @author yptian@aliyun.com * * first made * @version 1.0.0<br/> * */ public class PropertiesTool { // LOG private static final Logger LOG = Logger.getLogger(PropertiesTool.class); // Singleton instance private static PropertiesTool instance = new PropertiesTool(); private static Properties properties; /** * * Creates a new Singleton instance of PropertiesFileOperation.<br/> */ private PropertiesTool() { } /** * getInstance :get properties object * @param propertiesFilePathName properties file path and name * @return */ public static PropertiesTool getInstance(String propertiesFilePathName){ properties = loadPropertiesFile(propertiesFilePathName); return instance; } /** * * loadPropertiesFile:Load properties file by path and name<br/> * @param propertiesFilePathName path and name of properties file <br/> * @return properties properties */ private static Properties loadPropertiesFile(String propertiesFilePathName) { Properties properties = new Properties(); InputStream isLoad = PropertiesTool.class.getClassLoader().getResourceAsStream(propertiesFilePathName); try { // loader properties properties.load(isLoad); } catch (IOException e) { LOG.error(propertiesFilePathName + ' properties file read failure', e); } finally {try {isLoad.close();} catch (IOException e) {LOG.error('properties file stream close error',e);} } return properties; } /** * * * getPropertiesValue:Get properties value by key <br/> * @param key properties key <br/> * @return value properties value */ public String getPropertiesValue(String key) { return properties.getProperty(key); } public static String getInstanceByServerRealPathOfValue(String propertiesFileServerRealPathName,String key){ String pValue = null; try {InputStream isrLoad = new FileInputStream(propertiesFileServerRealPathName);properties.load(isrLoad);isrLoad.close();pValue = properties.getProperty(key);} catch (IOException e) {LOG.error('Failed to get the value under the server of the properties file',e);} return pValue; } /** * * getProperties:Get properties by key and value <br/> * @param key properties key <br/> * @param value properties value */ public void setProperties(String filePath,String key,String value){ try { InputStream is = new FileInputStream(filePath); OutputStream os = new FileOutputStream(filePath);properties.load(is);properties.setProperty(key, value);properties.store(os, null);os.flush();is.close();os.close();} catch (IOException e) {LOG.error('properties file stream close error',e);} } /** * * alterProperties:alter properties by key and value <br/> * @param key properties key <br/> * @param value properties value */ public void alterProperties(String filePath,String key,String value){ try{ InputStream is = new FileInputStream(filePath); OutputStream os = new FileOutputStream(filePath); properties.load(is); properties.remove(key); properties.setProperty(key, value); properties.store(os, null);os.flush();is.close();os.close(); } catch (IOException e) { LOG.error('properties file stream close error',e); } } /** * * getAllProperties:Read the properties of all the information <br/> * @return properties information */ @SuppressWarnings('rawtypes')public String getAllProperties(){Enumeration en = properties.propertyNames(); StringBuffer sf = new StringBuffer(); while (en.hasMoreElements()) { String key = (String) en.nextElement(); String value = properties.getProperty (key); sf.append('n'+key); sf.append('='); value = value.replace(':', ':'); sf.append(value); } return sf.toString(); } }

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