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 {
//LOG
private static final Logger LOG =Logger.getLogger(VerificationCodeTool.class);
//verification code image width
private static final int IMG_WIDTH=146;
//verification code image height
private static final int IMG_HEIGHT=30;
//The number of interference lines
private static final int DISTURB_LINE_SIZE = 15;
//generate a random number
private Random random = new Random();
//result
private int xyresult;
//result random string
private 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 code
private static final String CVCNUMBERS = "\u96F6\u4E00\u4E8C\u4E09\u56DB\u4E94\u516D\u4E03\u516B\u4E5D\u5341\u4E58\u9664\u52A0\u51CF";
//Definition of drawings in the captcha characters font, font name, font style, font size
//static final font : In Chinese characters garbled
private final Font font = new Font("黑体", Font.BOLD, 18);
//data operator
private 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(){
//image
BufferedImage image = new BufferedImage(IMG_WIDTH, IMG_HEIGHT, BufferedImage.TYPE_INT_RGB);
//In memory to create a brush
Graphics 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 background
g.fillRect(0, 0, IMG_WIDTH, IMG_HEIGHT);
//Set the brush color
g.setColor(getRandomColor(200,250));
//image border
g.drawRect(0, 0, IMG_WIDTH-2, IMG_HEIGHT-2);
//Set disturb line color
g.setColor(getRandomColor(110, 133));
//Generate random interference lines
for(int i =0;i < DISTURB_LINE_SIZE; i++){
drawDisturbLine1(g);
drawDisturbLine2(g);
}
//Generate a random number, set return data
getRandomMathString();
LOG.info("验证码 : "+randomString);
LOG.info("验证码结果 : "+xyresult);
//The generated random string used to save the system
StringBuffer 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,"\u7B49\u4E8E\uFF1F", 3);
logsu.append("\u7B49\u4E8E \uFF1F");
LOG.info("汉字验证码 : "+logsu);
randomString = logsu.toString();
//Release the brush object
g.dispose();
return image;
}
/**
* Get a random string
* */
private void getRandomMathString(){
//Randomly generated number 0 to 10
int xx = random.nextInt(10);
int yy = random.nextInt(10);
//save getRandomString
StringBuilder suChinese = new StringBuilder();
//random 0,1,2
int Randomoperands = (int) Math.round(Math.random()*2);
//multiplication
if(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 style
g.setFont(font);
//Set the color string
int 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 value
int x = random.nextInt(3);
int y = random.nextInt(2);
g.translate(x, y);
//Set the font rotation angle
int degree = new Random().nextInt() % 15;
//Positive point of view
g.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 Angle
g.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 trichromatic
int 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 {
//LOG
private 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 = "\u73A9\u547D\u52A0\u8F7D\u4E2D\u2026";
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:\\imagetool\\drawimage.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+"\\servertempdictory\\fileicon";
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 image
ImageIO.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*" class="com.tsXs.fileshare.controller.UserController" 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" id="verificationcodereg" name="verificationcodereg" tabindex="3" maxlength="3" class="t_input" value="" style="ime-mode:disabled;" onblur="checkuserverificationcode(this);" onkeypress="return (/[\d-]/.test(String.fromCharCode(event.keyCode)));" />
<span id="usvcmsg"></span>
<input type="hidden" id="verificationcoderegflag" value="" />
</td>
</tr>
<tr>
<td width="140">
<div id="refreshvc">
<span onclick="refreshvc();" style="padding-left: 49px;cursor: pointer;"><img id="verificationcodeimg" src="${pageContext.request.contextPath}/servertempdictory/fileicon/defaultverificationcode.jpeg" />
<span style="height: 30px;width: 16px;padding-left: 4px;"><img src="image/refreshvc.png" /></span>
<span style="font-size: 12px;color:#2c629e; width: 20px;">换一张</span>
</span>
</div>
</td>
</tr>
在js中用正则，保证只能输入，最多3位，可以在数字前输入一个"-",即onkeypress保证只能输入数字和"-":
var userverificationcoderegex = /^(-{0,1}\d+){1,3}$/;
if(userverificationcoderegex.test(userverificationcode)){.....jsp图片效果：
js动态刷新验证码：
$(document).ready(function(){
//load verificatino code
refreshvc();
});
//refresh verification code
function 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：
<pre class="java" name="code">/**
* 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();
}
}
