你在java發(fā)這個問題!我就把java 的驗(yàn)證碼源碼給你。
創(chuàng)新互聯(lián)公司公司2013年成立,先為陸川等服務(wù)建站,陸川等地企業(yè),進(jìn)行企業(yè)商務(wù)咨詢服務(wù)。為陸川企業(yè)網(wǎng)站制作PC+手機(jī)+微官網(wǎng)三網(wǎng)同步一站式服務(wù)解決您的所有建站問題。
tr
tdfont color="#FFFFFF"驗(yàn)證碼:/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"/%
//設(shè)置頁面不緩存
//response.reset();
response.setContentType("image/jpeg");
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
//在內(nèi)存中創(chuàng)建圖象寬60 高18 4個字符 0條干擾線
BufferedImage image = rc.getRandomImage(58, 18, 4, 1);
//設(shè)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: 隨機(jī)碼圖形生成程序的處理 Description:
* 為了加強(qiáng)網(wǎng)絡(luò)安全,防止黑課工具對系統(tǒng)的攻擊,現(xiàn)在通用隨機(jī)碼來解決這個問題,因?yàn)槊恳淮萎a(chǎn)生的隨機(jī)碼是隨機(jī)的,所以使用窮舉法破解密碼的工具就無能為力了
* Copyright: Copyright (c) 2004-2010 Company: SDLDAP
*
* @author LiChanglai
* @version 1.0
*/
import java.util.*;
import java.awt.*;
import java.awt.image.*;
public class RandomChar {
/**
* 給定范圍獲得隨機(jī)顏色
*
* @param fc
* int 參數(shù)1
* @param bc
* int 參數(shù)2
* @return Color 返回的color對象
*/
private String strRandomString; // 生成的隨機(jī)數(shù)
/**
* 取其生成的隨機(jī)數(shù)
*
* @return String
*/
public String getRandomString() {
return strRandomString;
}
/**
* 設(shè)置其生成的隨數(shù)
*
* @param randomString
* String
*/
public void setRandomString(String randomString) {
this.strRandomString = randomString;
}
/**
* 取其某一范圍的color
*
* @param fc
* int 范圍參數(shù)1
* @param bc
* int 范圍參數(shù)2
* @return Color
*/
private Color getRandColor(int fc, int bc) {
// 取其隨機(jī)顏色
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);
}
/**
* 用于生成其隨機(jī)數(shù)
*
* @param randomCount
* int 隨機(jī)數(shù)總長度
* @return String 返回的隨機(jī)數(shù)
*/
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;
// 取其隨機(jī)數(shù)的總數(shù)
int LengthOfRandom = a.length;
// 生成隨機(jī)類
Random random = new Random();
// 循環(huán)取隨機(jī)取其整數(shù),并將其整數(shù)所對應(yīng)的結(jié)果進(jìn)行累加
for (int i = 0; i nRandomCount; i++) {
nRand = random.nextInt(LengthOfRandom);
strRand += a[nRand];
}
// 返回累加后的結(jié)果
return strRand;
}
/**
* 生成其隨機(jī)的圖形
*
* @param width
* int 生成圖形的寬度
* @param height
* int 生成圖形的高度
* @param nLengthOfRandom
* int 隨機(jī)碼的個數(shù)
* @param nDisturbLineCount
* int 干擾線的條數(shù)
* @return BufferedImage
*/
public BufferedImage getRandomImage(int nWidth, int nHeight,
int nLengthOfRandom, int nDisturbLineCount)
{
// 在內(nèi)存中創(chuàng)建圖象
BufferedImage image = new BufferedImage(nWidth, nHeight,
BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
String strRand = "";
nLengthOfRandom = (nLengthOfRandom = 0) ? 6 : nLengthOfRandom;
nDisturbLineCount = (nDisturbLineCount = 0) ? 0 : nDisturbLineCount;
// 生成隨機(jī)類
Random random = new Random();
// 設(shè)定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, nWidth, nHeight);
// 設(shè)定字體
g.setFont(new Font("Times New Roman", Font.PLAIN, 16));
// 畫邊框
g.setColor(new Color(255, 255, 255));
g.drawRect(0, 0, nWidth - 1, nHeight - 1);
// 隨機(jī)產(chǎn)生nDisturbLineCount條干擾線,使圖象中的認(rèn)證碼不易被其它程序探測到
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);
}
// 取隨機(jī)產(chǎn)生的認(rèn)證碼(6位)
strRand = this.getRandomString(nLengthOfRandom);
// 設(shè)置其屬性randomString的值
this.strRandomString = strRand;
for (int i = 0; i nLengthOfRandom; i++) {
// 將認(rèn)證碼顯示到圖象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 調(diào)用函數(shù)出來的顏色相同,可能是因?yàn)榉N子太接近,所以只能直接生成
g.drawString(strRand.substring(i, i + 1), 13 * i + 5, 14);
}
// 圖象生效
g.dispose();
return image;
}
}
Java如何實(shí)現(xiàn)驗(yàn)證碼驗(yàn)證功能呢?日常生活中,驗(yàn)證碼隨處可見,他可以在一定程度上保護(hù)賬號安全,那么他是怎么實(shí)現(xiàn)的呢?
Java實(shí)現(xiàn)驗(yàn)證碼驗(yàn)證功能其實(shí)非常簡單:用到了一個Graphics類在畫板上繪制字母,隨機(jī)選取一定數(shù)量的字母隨機(jī)生成,然后在畫板上隨機(jī)生成幾條干擾線。
首先,寫一個驗(yàn)證碼生成幫助類,用來繪制隨機(jī)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(yàn)證碼,同時(shí)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(yàn)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(shù))
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(yàn)證碼的使用場景,以及捕獲頁面生成的驗(yàn)證碼(捕獲到的二維碼與用戶輸入的驗(yàn)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(dāng)前請求?對應(yīng)的?會話對象
HttpSession?session?=?request.getSession();
//?從請求中獲得?URI?(?統(tǒng)一資源標(biāo)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(yàn)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(yàn)證碼內(nèi)容:?"?+?code);
//?建立?uri?和?相應(yīng)的?驗(yàn)證碼?的關(guān)聯(lián)?(?存儲到當(dāng)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(yàn)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(rèn)密碼"
/span
/div
div?class="form-row"
span?class="cell-7"
input?type="text"?name="verifyCode"?placeholder="請輸入驗(yàn)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(jié)束?--
/form
/div
/body
/html
效果如下圖:
在控制臺接收到的圖片中驗(yàn)證碼的變化如下:
當(dāng)點(diǎn)擊刷新頁面的時(shí)候,驗(yàn)證碼也會隨著變化,但我們看不清驗(yàn)證碼時(shí),只要點(diǎn)擊驗(yàn)證碼就會刷新,這樣局部的刷新可以用JavaScript來實(shí)現(xiàn)。
在img
src="/demo/verify/regist.do"中,添加一個問號和一串后綴數(shù)字,當(dāng)刷新時(shí)讓后綴數(shù)字不斷改變,那么形成的驗(yàn)證碼也會不斷變化,我們可以采用的一種辦法是后綴數(shù)字用date代替,date獲取本機(jī)時(shí)間,時(shí)間是隨時(shí)變的,這樣就保證了刷新驗(yàn)證碼可以隨時(shí)變化。
代碼如下:
function?myRefersh(?e?)?{
const?source?=?e.src?;?//?獲得原來的?src?中的內(nèi)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(jìn)入內(nèi)部
var?s?=?source.substring(?0?,?index?)?;?//?從?source?中截取?index?之前的內(nèi)容?(?index?以及?index?之后的內(nèi)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(shí)例
var?time?=?date.getTime()?;?//?從?新創(chuàng)建的?Date?對象的實(shí)例中獲得該時(shí)間對應(yīng)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(xì)可追問
slider=new JSlider(JSlider.VERTICAL,FPS_MIN,FPS_MAX,FPS_INIT);
slider.setMajorTickSpacing(10);//主刻度間隔
slider.setMinorTickSpacing(1);//次刻度間隔
slider.setPaintTicks(true);//是否顯示刻度標(biāo)記
HashtableInteger,JLabel labeltable=new HashtableInteger,JLabel();
labeltable.put(new Integer(0),new JLabel("慢速"));
labeltable.put(new Integer(FPS_MAX/2),new JLabel("中速"));
labeltable.put(new Integer(FPS_MAX),new JLabel("快速"));
slider.setLabelTable(labeltable);
slider.setPaintLabels(true);//是否顯示label