java滑动验证码源代码滑动验证码api

用java随机生成四位验证码，只求编程代码

我自己做的系统里面用作验证码的JSP的

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%@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

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

验证码源代码，jsp

%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%

%@page import="java.awt.image.BufferedImage"%

%@page import="java.awt.Graphics2D"%

%@page import="java.awt.Color"%

%@page import="java.awt.Font"%

%@page import="javax.imageio.ImageIO"%

int width = 60;

int height = 20;

// 创建具有可访问图像数据缓冲区的Image

BufferedImage buffImg = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = buffImg.createGraphics();

// 创建一个随机数生成器

Random random = new Random();

g.setColor(Color.WHITE);

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

// 创建字体，字体的大小应该根据图片的高度来定

Font font = new Font("Times New Roman", Font.PLAIN, 18);

// 设置字体

g.setFont(font);

// 画边框

g.setColor(Color.BLACK);

g.drawRect(0, 0, width - 1, height - 1);

// 随机产生160条干扰线

g.setColor(Color.LIGHT_GRAY);

for (int i = 0; i 160; i++) {

int x = random.nextInt(width);

int y = random.nextInt(height);

int x1 = random.nextInt(12);

int y1 = random.nextInt(12);

g.drawLine(x, y, x + x1, y + y1);

}

// randomCode 用于保存随机产生的验证码

StringBuffer randomCode = new StringBuffer();

int red = 0, green = 0, blue = 0;

// 随机产生4位数字的验证码

for (int i = 0; i 4; i++) {

// 得到随机产生的验证码数字

String strRand = String.valueOf(random.nextInt(10));

// 产生随机的颜色分量来构造颜色值

red = random.nextInt(110);

green = random.nextInt(50);

blue = random.nextInt(50);

// 用随机产生的颜色将验证码绘制到图像中

g.setColor(new Color(red, green, blue));

g.drawString(strRand, 13 * i + 6, 16);

randomCode.append(strRand);

}

// 将四位数字的验证码保存到session中

//HttpSession session = request.getSession();

session.setAttribute("randomCode", randomCode.toString());

// 禁止图像缓存

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

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

response.setDateHeader("Expires", 0);

response.setContentType("image/jpeg");

// 将图像输出到servlet输出流中

ServletOutputStream sos = response.getOutputStream();

ImageIO.write(buffImg, "jpeg", sos);

sos.close();

//sos = null;

out.clear();

out = pageContext.pushBody();

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java滑动验证码源代码 滑动验证码api

用java随机生成四位验证码，只求编程代码

Java如何实现验证码验证功能

验证码源代码，jsp

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java滑动验证码源代码滑动验证码api