java滑动验证码源代码 java 滑动验证码

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Java如何实现验证码验证功能

Java如何实现验证码验证功能呢？日常生活中，验证码随处可见，他可以在一定程度上保护账号安全，那么他是怎么实现的呢？

Java实现验证码验证功能其实非常简单：用到了一个Graphics类在画板上绘制字母，随机选取一定数量的字母随机生成，然后在画板上随机生成几条干扰线。

首先，写一个验证码生成帮助类，用来绘制随机字母：

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.OutputStream;

import java.util.Random;

import javax.imageio.ImageIO;

public final class GraphicHelper {

/**

* 以字符串形式返回生成的验证码，同时输出一个图片

* @param width

* 图片的宽度

* @param height

* 图片的高度

* @param imgType

* 图片的类型

* @param output

* 图片的输出流(图片将输出到这个流中)

* @return 返回所生成的验证码(字符串)

public static String create(final int width, final int height, final String imgType, OutputStream output) {

StringBuffer sb = new StringBuffer();

Random random = new Random();

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics graphic = image.getGraphics();

graphic.setColor(Color.getColor("F8F8F8"));

graphic.fillRect(0, 0, width, height);

Color[] colors = new Color[] { Color.BLUE, Color.GRAY, Color.GREEN, Color.RED, Color.BLACK, Color.ORANGE,

Color.CYAN };

// 在 "画板"上生成干扰线条 ( 50 是线条个数)

for (int i = 0; i 50; i++) {

graphic.setColor(colors[random.nextInt(colors.length)]);

final int x = random.nextInt(width);

final int y = random.nextInt(height);

final int w = random.nextInt(20);

final int h = random.nextInt(20);

final int signA = random.nextBoolean() ? 1 : -1;

final int signB = random.nextBoolean() ? 1 : -1;

graphic.drawLine(x, y, x + w * signA, y + h * signB);

}

// 在 "画板"上绘制字母

graphic.setFont(new Font("Comic Sans MS", Font.BOLD, 30));

for (int i = 0; i 6; i++) {

final int temp = random.nextInt(26) + 97;

String s = String.valueOf((char) temp);

sb.append(s);

graphic.setColor(colors[random.nextInt(colors.length)]);

graphic.drawString(s, i * (width / 6), height - (height / 3));

}

graphic.dispose();

try {

ImageIO.write(image, imgType, output);

} catch (IOException e) {

e.printStackTrace();

}

return sb.toString();

}

接着，创建一个servlet，用来固定图片大小，以及处理验证码的使用场景，以及捕获页面生成的验证码（捕获到的二维码与用户输入的验证码一致才能通过）。

import java.io.OutputStream;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

@WebServlet(urlPatterns = "/verify/regist.do" )

public class VerifyCodeServlet extends HttpServlet {

private static final long serialVersionUID = 3398560501558431737L;

@Override

protected void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// 获得当前请求对应的会话对象

HttpSession session = request.getSession();

// 从请求中获得 URI ( 统一资源标识符 )

String uri = request.getRequestURI();

System.out.println("hello : " + uri);

final int width = 180; // 图片宽度

final int height = 40; // 图片高度

final String imgType = "jpeg"; // 指定图片格式 (不是指MIME类型)

final OutputStream output = response.getOutputStream(); // 获得可以向客户端返回图片的输出流

// (字节流)

// 创建验证码图片并返回图片上的字符串

String code = GraphicHelper.create(width, height, imgType, output);

System.out.println("验证码内容: " + code);

// 建立 uri 和相应的验证码的关联 ( 存储到当前会话对象的属性中 )

session.setAttribute(uri, code);

System.out.println(session.getAttribute(uri));

}

接着写一个HTML注册页面用来检验一下：

html

head

meta charset="UTF-8"

title注册/title

link rel="stylesheet" href="styles/general.css"

link rel="stylesheet" href="styles/cell.css"

link rel="stylesheet" href="styles/form.css"

script type="text/javascript" src="js/ref.js"/script

style type="text/css"

.logo-container {

margin-top: 50px ;

}

.logo-container img {

width: 100px ;

}

.message-container {

height: 80px ;

}

.link-container {

height: 40px ;

line-height: 40px ;

}

.link-container a {

text-decoration: none ;

}

/style

/head

body

div class="container form-container"

form action="/wendao/regist.do" method="post"

div class="form" !-- 注册表单开始 --

div class="form-row"

span class="cell-1"

i class="fa fa-user"/i

/span

span class="cell-11" style="text-align: left;"

input type="text" name="username" placeholder="请输入用户名"

/span

/div

div class="form-row"

span class="cell-1"

i class="fa fa-key"/i

/span

span class="cell-11" style="text-align: left;"

input type="password" name="password" placeholder="请输入密码"

/span

/div

div class="form-row"

span class="cell-1"

i class="fa fa-keyboard-o"/i

/span

span class="cell-11" style="text-align: left;"

input type="password" name="confirm" placeholder="请确认密码"

/span

/div

div class="form-row"

span class="cell-7"

input type="text" name="verifyCode" placeholder="请输入验证码"

/span

span class="cell-5" style="text-align: center;"

img src="/demo/verify/regist.do" onclick="myRefersh(this)"

/span

/div

div class="form-row" style="border: none;"

span class="cell-6" style="text-align: left"

input type="reset" value="重置"

/span

span class="cell-6" style="text-align:right;"

input type="submit" value="注册"

/span

/div

/div !-- 注册表单结束 --

/form

/div

/body

/html

效果如下图：

在控制台接收到的图片中验证码的变化如下：

当点击刷新页面的时候，验证码也会随着变化，但我们看不清验证码时，只要点击验证码就会刷新，这样局部的刷新可以用JavaScript来实现。

在img

src="/demo/verify/regist.do"中，添加一个问号和一串后缀数字，当刷新时让后缀数字不断改变，那么形成的验证码也会不断变化，我们可以采用的一种办法是后缀数字用date代替，date获取本机时间，时间是随时变的，这样就保证了刷新验证码可以随时变化。

代码如下：

function myRefersh( e ) {

const source = e.src ; // 获得原来的 src 中的内容

//console.log( "source : " + source ) ;

var index = source.indexOf( "?" ) ; // 从 source 中寻找 ? 第一次出现的位置 (如果不存在则返回 -1 )

//console.log( "index : " + index ) ;

if( index -1 ) { // 如果找到了 ? 就进入内部

var s = source.substring( 0 , index ) ; // 从 source 中截取 index 之前的内容 ( index 以及 index 之后的内容都被舍弃 )

//console.log( "s : " + s ) ;

var date = new Date(); // 创建一个 Date 对象的一个实例

var time = date.getTime() ; // 从新创建的 Date 对象的实例中获得该时间对应毫秒值

e.src = s + "?time=" + time ; // 将加了尾巴的地址重新放入到 src 上

//console.log( e.src ) ;

} else {

var date = new Date();

e.src = source + "?time=" + date.getTime();

}

如回答不详细可追问

相关问答

Q1: 用java怎么制作验证码

原理:

1.随机生成4个数字用到了Random类

2.对这4个数字设置字体格式用 setFont方法

3.改变字体颜色用setColor 然后随机生成颜色

代码如下

package s1;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.jms.Session;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class GetImage extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

this.doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// 发送图片不能够添加这2行代码

// response.setContentType("text/html;charset=UTF-8");

// request.setCharacterEncoding("UTF-8");

int width=100;

int height=50;

//获得一张图片

BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g=image.getGraphics();

g.setColor(Color.WHITE);

g.fillRect(1, 1, width-2, height-2);

g.setFont(new Font("宋体",Font.BOLD,30));

Random random=new Random();

// 填充的字符串

String str="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

//缓存生成的验证码

StringBuffer stringbuffer=new StringBuffer();

//随机生成验证码的颜色和字符

for(int i=0;i4;i++)

{ //设置随机颜色

g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));

int index=random.nextInt(62);//这里的62就是从填充字符段中随意选取一个位置

String str1=str.substring(index,index+1);

g.drawString(str1, 20*i, 30);//x,y数值设置太小会显示不出来

stringbuffer.append(str1);

}

//将生成的验证码存到服务器

request.getSession().setAttribute("checkcode", stringbuffer.toString());//key和value

//将图片发送给浏览器

ImageIO.write(image, "jpg", response.getOutputStream());

}

用户登录界面代码

package s1;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class Login extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");// 设置服务器发送给浏览器的编码方式

request.setCharacterEncoding("UTF-8"); // 客户端向服务器提交的数据的解码方式

// 获得用户提交的数据

String checkcode = request.getParameter("checkcode");

System.out.println(checkcode);

// 判断输入的验证码是不是符合

HttpSession session = request.getSession();// session是存放数据的地方

String str = (String) session.getAttribute("checkcode");

if (str != null) {

if (checkcode.compareToIgnoreCase(str) == 0) // 验证码忽略大小写

response.getWriter().println("验证码输入正确");

else

response.getWriter().println("验证码输入错误");

}

else response.getWriter().println("验证码失效");

// 使用完的验证码信息要删除,返回原页面再输一次,验证码就失效了

session.removeAttribute("checkcode");

}

Q2: 用java随机生成四位验证码，只求编程代码

java滑动验证码源代码我自己做java滑动验证码源代码的系统里面用作验证码java滑动验证码源代码的JSP的

%@page contentType="image/jpeg;charset=utf-8"%

%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" %

%@ page import="java.io.OutputStream" %

html

body

Color getRandColor(int fc,int bc)

{

Random rd=new Random();

if(fc255) fc=255;

if(bc255) bc=255;

int red=fc+rd.nextInt(bc-fc);

int green=fc+rd.nextInt(bc-fc);

int blue=fc+rd.nextInt(bc-fc);

return new Color(red,green,blue);

}

Random r=new Random();

response.addHeader("Pragma","No-cache");

response.addHeader("Cache-Control","no-cache");

response.addDateHeader("expires",0);

int width=90;

int height=23;

BufferedImage pic=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

Graphics gc=pic.getGraphics();

gc.setColor(getRandColor(200,250));

gc.fillRect(0,0,width,height);

String[] rNum ={"0","1","2","3","4","5","6","7","8","9","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","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"};

int[] style = {Font.PLAIN,Font.BOLD,Font.ITALIC,Font.PLAIN+Font.BOLD,

Font.BOLD+Font.ITALIC,Font.PLAIN+Font.ITALIC,Font.PLAIN+Font.BOLD+Font.ITALIC};

gc.setColor(Color.WHITE);

gc.drawLine(0,30,90,10);

gc.setColor(getRandColor(160,200));

for (int i=0;i50;i++)

{

int x = r.nextInt(width);

int y = r.nextInt(height);

int xl = r.nextInt(10);

int yl = r.nextInt(10);

gc.drawLine(x,y,x+xl,y+yl);

}

gc.setColor(getRandColor(60,150));

String rt = "";

for(int i=0;i4;i++){

String temp = rNum[r.nextInt(62)];

rt = rt+temp;

gc.setFont(new Font("Times New Roman",style[r.nextInt(7)],15));

gc.drawString(temp,5+i*15+r.nextInt(10),10+r.nextInt(10));

}

gc.dispose();

session.setAttribute("randNum",rt);

OutputStream os=response.getOutputStream();

ImageIO.write(pic,"JPEG",os);

System.out.println("当前验证码为:"+session.getAttribute("randNum"));

os.flush();

os.close();

os=null;

response.flushBuffer();

out.clear();

out = pageContext.pushBody();

/body

/html

Q3: 验证码代码

java滑动验证码源代码你在java发这个问题！java滑动验证码源代码我就把java 的验证码源码给你。

tdfont color="#FFFFFF"验证码：/font/td

td width="22%"input type="text" name="randomcode" class='input' size='4' maxlength="8" style="width:50px;height:18px" onKeyDown="if (event.keyCode==13)submitLogin();"

/td

td width="48%"img src="./showradomcode.jsp"/td

/tr

文件二：showradomcode.jsp

%@ page contentType="image/jpeg" import="java.awt.image.*,javax.imageio.*" %jsp:useBean id="rc" class="com.hanweb.sso.ldap.util.RandomChar" scope="page"/%

//设置页面不缓存

//response.reset();

response.setContentType("image/jpeg");

response.setHeader("Pragma","No-cache");

response.setHeader("Cache-Control","no-cache");

response.setDateHeader("Expires", 0);

//在内存中创建图象宽60 高18 4个字符 0条干扰线

BufferedImage image = rc.getRandomImage(58, 18, 4, 1);

//设置其session值

session.setAttribute("jcmsrandomchar", rc.getRandomString());

session.setMaxInactiveInterval(100000000);

ImageIO.write(image, "JPEG", response.getOutputStream());

文件三：RandomChar.java

package com.hanweb.sso.ldap.util;

/**

* Title: 随机码图形生成程序的处理 Description:

* 为了加强网络安全，防止黑课工具对系统的攻击，现在通用随机码来解决这个问题，因为每一次产生的随机码是随机的，所以使用穷举法破解密码的工具就无能为力了

* @author LiChanglai

* @version 1.0

import java.util.*;

import java.awt.*;

import java.awt.image.*;

public class RandomChar {

/**

* 给定范围获得随机颜色

* @param fc

* int 参数1

* @param bc

* int 参数2

* @return Color 返回的color对象

private String strRandomString; // 生成的随机数

/**

* 取其生成的随机数

* @return String

public String getRandomString() {

return strRandomString;

}

/**

* 设置其生成的随数

* @param randomString

* String

public void setRandomString(String randomString) {

this.strRandomString = randomString;

}

/**

* 取其某一范围的color

* @param fc

* int 范围参数1

* @param bc

* int 范围参数2

* @return Color

private Color getRandColor(int fc, int bc) {

// 取其随机颜色

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);

}

/**

* 用于生成其随机数

* @param randomCount

* int 随机数总长度

* @return String 返回的随机数

private String getRandomString(int nRandomCount) {

* String[] a = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",

* "B", "C", "D", "E", "F", "G", "H", "I", "G", "K", "L", "M", "N", "O",

* "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "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[] a = { "a", "b", "c", "d", "e", "f", "g", "h", "g", "k", "m",

"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z" };

String strRand = "";

int nRand;

// 取其随机数的总数

int LengthOfRandom = a.length;

// 生成随机类

Random random = new Random();

// 循环取随机取其整数,并将其整数所对应的结果进行累加

for (int i = 0; i nRandomCount; i++) {

nRand = random.nextInt(LengthOfRandom);

strRand += a[nRand];

}

// 返回累加后的结果

return strRand;

}

/**

* 生成其随机的图形

* @param width

* int 生成图形的宽度

* @param height

* int 生成图形的高度

* @param nLengthOfRandom

* int 随机码的个数

* @param nDisturbLineCount

* int 干扰线的条数

* @return BufferedImage

public BufferedImage getRandomImage(int nWidth, int nHeight,

int nLengthOfRandom, int nDisturbLineCount)

{

// 在内存中创建图象

BufferedImage image = new BufferedImage(nWidth, nHeight,

BufferedImage.TYPE_INT_RGB);

// 获取图形上下文

Graphics g = image.getGraphics();

String strRand = "";

nLengthOfRandom = (nLengthOfRandom = 0) ? 6 : nLengthOfRandom;

nDisturbLineCount = (nDisturbLineCount = 0) ? 0 : nDisturbLineCount;

// 生成随机类

Random random = new Random();

// 设定背景色

g.setColor(getRandColor(200, 250));

g.fillRect(0, 0, nWidth, nHeight);

// 设定字体

g.setFont(new Font("Times New Roman", Font.PLAIN, 16));

// 画边框

g.setColor(new Color(255, 255, 255));

g.drawRect(0, 0, nWidth - 1, nHeight - 1);

// 随机产生nDisturbLineCount条干扰线，使图象中的认证码不易被其它程序探测到

g.setColor(getRandColor(160, 200));

for (int i = 0; i nDisturbLineCount; i++) {

int x = random.nextInt(nWidth);

int y = random.nextInt(nHeight);

int xl = random.nextInt(12);

int yl = random.nextInt(12);

g.drawLine(x, y, x + xl, y + yl);

}

// 取随机产生的认证码(6位)

strRand = this.getRandomString(nLengthOfRandom);

// 设置其属性randomString的值

this.strRandomString = strRand;

for (int i = 0; i nLengthOfRandom; i++) {

// 将认证码显示到图象中

g.setColor(new Color(20 + random.nextInt(110), 20 + random

.nextInt(110), 20 + random.nextInt(110)));

// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成

g.drawString(strRand.substring(i, i + 1), 13 * i + 5, 14);

}

// 图象生效

g.dispose();

return image;

}

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Java如何实现验证码验证功能

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