java滑動驗證碼源代碼 滑動驗證碼api

用java隨機生成四位驗證碼,只求編程代碼

我自己做的系統(tǒng)里面用作驗證碼的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("當前驗證碼為:"+session.getAttribute("randNum"));

os.flush();

os.close();

os=null;

response.flushBuffer();

out.clear();

out = pageContext.pushBody();

%

/body

/html

Java如何實現(xiàn)驗證碼驗證功能

Java如何實現(xiàn)驗證碼驗證功能呢?日常生活中,驗證碼隨處可見,他可以在一定程度上保護賬號安全,那么他是怎么實現(xiàn)的呢?

Java實現(xiàn)驗證碼驗證功能其實非常簡單:用到了一個Graphics類在畫板上繪制字母,隨機選取一定數量的字母隨機生成,然后在畫板上隨機生成幾條干擾線。

首先,寫一個驗證碼生成幫助類,用來繪制隨機字母:

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驗證碼,同時輸出一個圖片

*

*?@param?width

*????????????圖片的寬度

*?@param?height

*????????????圖片的高度

*?@param?imgType

*????????????圖片的類型

*?@param?output

*????????????圖片的輸出流(圖片將輸出到這個流中)

*?@return?返回所生成的驗證碼(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?"畫板"上生成干擾線條?(?50?是線條個數)

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?"畫板"上繪制字母

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();

}

}?

接著,創(chuàng)建一個servlet,用來固定圖片大小,以及處理驗證碼的使用場景,以及捕獲頁面生成的驗證碼(捕獲到的二維碼與用戶輸入的驗證碼一致才能通過)。

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?{

//?獲得?當前請求?對應的?會話對象

HttpSession?session?=?request.getSession();

//?從請求中獲得?URI?(?統(tǒng)一資源標識符?)

String?uri?=?request.getRequestURI();

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

final?int?width?=?180;?//?圖片寬度

final?int?height?=?40;?//?圖片高度

final?String?imgType?=?"jpeg";?//?指定圖片格式?(不是指MIME類型)

final?OutputStream?output?=?response.getOutputStream();?//?獲得可以向客戶端返回圖片的輸出流

//?(字節(jié)流)

//?創(chuàng)建驗證碼圖片并返回圖片上的字符串

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

System.out.println("驗證碼內容:?"?+?code);

//?建立?uri?和?相應的?驗證碼?的關聯(lián)?(?存儲到當前會話對象的屬性中?)

session.setAttribute(uri,?code);

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

}

}?

接著寫一個HTML注冊頁面用來檢驗一下:

html

head

meta?charset="UTF-8"

title注冊/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"?!--?注冊表單開始?--

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="請輸入用戶名"

/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="請輸入密碼"

/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="請確認密碼"

/span

/div

div?class="form-row"

span?class="cell-7"

input?type="text"?name="verifyCode"?placeholder="請輸入驗證碼"

/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="注冊"

/span

/div

/div?!--?注冊表單結束?--

/form

/div

/body

/html

效果如下圖:

在控制臺接收到的圖片中驗證碼的變化如下:

當點擊刷新頁面的時候,驗證碼也會隨著變化,但我們看不清驗證碼時,只要點擊驗證碼就會刷新,這樣局部的刷新可以用JavaScript來實現(xiàn)。

在img

src="/demo/verify/regist.do"中,添加一個問號和一串后綴數字,當刷新時讓后綴數字不斷改變,那么形成的驗證碼也會不斷變化,我們可以采用的一種辦法是后綴數字用date代替,date獲取本機時間,時間是隨時變的,這樣就保證了刷新驗證碼可以隨時變化。

代碼如下:

function?myRefersh(?e?)?{

const?source?=?e.src?;?//?獲得原來的?src?中的內容

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

var?index?=?source.indexOf(?"?"?)?;??//?從?source?中尋找???第一次出現(xiàn)的位置?(如果不存在則返回?-1?)

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

if(?index??-1?)?{?//?如果找到了????就進入內部

var?s?=?source.substring(?0?,?index?)?;?//?從?source?中截取?index?之前的內容?(?index?以及?index?之后的內容都被舍棄?)

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

var?date?=?new?Date();?//?創(chuàng)建一個?Date?對象的?一個?實例

var?time?=?date.getTime()?;?//?從?新創(chuàng)建的?Date?對象的實例中獲得該時間對應毫秒值

e.src?=?s?+?"?time="?+?time?;?//?將?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();

}

}

如回答不詳細可追問

驗證碼源代碼,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;

// 創(chuàng)建具有可訪問圖像數據緩沖區(qū)的Image

BufferedImage buffImg = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

Graphics2D g = buffImg.createGraphics();

// 創(chuàng)建一個隨機數生成器

Random random = new Random();

g.setColor(Color.WHITE);

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

// 創(chuàng)建字體,字體的大小應該根據圖片的高度來定

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

// 設置字體

g.setFont(font);

// 畫邊框

g.setColor(Color.BLACK);

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

// 隨機產生160條干擾線

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 用于保存隨機產生的驗證碼

StringBuffer randomCode = new StringBuffer();

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

// 隨機產生4位數字的驗證碼

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

// 得到隨機產生的驗證碼數字

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

// 產生隨機的顏色分量來構造顏色值

red = random.nextInt(110);

green = random.nextInt(50);

blue = random.nextInt(50);

// 用隨機產生的顏色將驗證碼繪制到圖像中

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

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

randomCode.append(strRand);

}

// 將四位數字的驗證碼保存到session中

//HttpSession session = request.getSession();

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

// 禁止圖像緩存

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

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

response.setDateHeader("Expires", 0);

response.setContentType("image/jpeg");

// 將圖像輸出到servlet輸出流中

ServletOutputStream sos = response.getOutputStream();

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

sos.close();

//sos = null;

out.clear();

out = pageContext.pushBody();

%

網頁標題:java滑動驗證碼源代碼 滑動驗證碼api
標題來源:http://muchs.cn/article30/doeipso.html

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