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;
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 = "u96F6u4E00u4E8Cu4E09u56DBu4E94u516Du4E03u516Bu4E5Du5341u4E58u9664u52A0u51CF";
//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 OPMap = new HashMap();
static{
OPMap.put("*", 11);
OPMap.put("/", 12);
OPMap.put("+", 13);
OPMap.put("-", 14);
}
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,"u7B49u4E8EuFF1F", 3);
logsu.append("u7B49u4E8E uFF1F");
LOG.info("汉字验证码 : "+logsu);
randomString = logsu.toString();
//Release the brush object
g.dispose();
return image;
}
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();
}
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);
}
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);
}
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);
}
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);
}
public int getXyresult() {
return xyresult;
}
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;
public class ImageTool {
//LOG
private static final Logger LOG = Logger.getLogger(ImageTool.class);
//image
private BufferedImage image;
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);
}
}
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");
}
}
}
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");
}
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)：
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：
/view/common/message.jsp /view/userLogin.jsp
页面jsp显示代码：
*[验证码]:只能输入数字和负号"-" 换一张
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：
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：
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;
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;
private PropertiesTool() {
}
public static PropertiesTool getInstance(String propertiesFilePathName){
properties = loadPropertiesFile(propertiesFilePathName);
return instance;
}
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;
}
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;
}
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);
}
}
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);
}
}
@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();
}
}
到此这篇关于Java实现中文算数验证码的实现示例(算数运算+-*/)的文章就介绍到这了,更多相关Java 中文算数验证码内容请搜索考高分网以前的文章或继续浏览下面的相关文章希望大家以后多多支持考高分网！
