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怎么用Java代碼實(shí)現(xiàn)一個(gè)驗(yàn)證碼，求具體實(shí)現(xiàn)方法
package?util;
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import?java.awt.Color;
import?java.awt.Font;
import?java.awt.Graphics;
import?java.awt.image.BufferedImage;
import?java.io.FileOutputStream;
import?java.io.IOException;
import?java.io.OutputStream;
import?java.util.Random;
import?javax.imageio.ImageIO;
public?final?class?ImageUtil?{
//?驗(yàn)證碼字符集
private?static?final?char[]?chars?=?{?
'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'};
//?字符數(shù)量
private?static?final?int?SIZE?=?4;
//?干擾線數(shù)量
private?static?final?int?LINES?=?5;
//?寬度
private?static?final?int?WIDTH?=?80;
//?高度
private?static?final?int?HEIGHT?=?40;
//?字體大小
private?static?final?int?FONT_SIZE?=?30;
/**
*?生成隨機(jī)驗(yàn)證碼及圖片
*?返回的數(shù)組中，第1個(gè)值是驗(yàn)證碼，第2個(gè)值是圖片
*/
public?static?Object[]?createImage()?{
StringBuffer?sb?=?new?StringBuffer();
//?1.創(chuàng)建空白圖片
BufferedImage?image?=?new?BufferedImage(
WIDTH,?HEIGHT,?BufferedImage.TYPE_INT_RGB);
//?2.獲取圖片畫筆
Graphics?graphic?=?image.getGraphics();
//?3.設(shè)置畫筆顏色
graphic.setColor(Color.LIGHT_GRAY);
//?4.繪制矩形背景
graphic.fillRect(0,?0,?WIDTH,?HEIGHT);
//?5.畫隨機(jī)字符
Random?ran?=?new?Random();
for?(int?i?=?0;?i?SIZE;?i++)?{
//?取隨機(jī)字符索引
int?n?=?ran.nextInt(chars.length);
//?設(shè)置隨機(jī)顏色
graphic.setColor(getRandomColor());
//?設(shè)置字體大小
graphic.setFont(new?Font(
null,?Font.BOLD?+?Font.ITALIC,?FONT_SIZE));
//?畫字符
graphic.drawString(
chars[n]?+?"",?i?*?WIDTH?/?SIZE,?HEIGHT?/?2);
//?記錄字符
sb.append(chars[n]);
}
//?6.畫干擾線
for?(int?i?=?0;?i??LINES;?i++)?{
//?設(shè)置隨機(jī)顏色
graphic.setColor(getRandomColor());
//?隨機(jī)畫線
graphic.drawLine(ran.nextInt(WIDTH),?ran.nextInt(HEIGHT),
ran.nextInt(WIDTH),?ran.nextInt(HEIGHT));
}
//?7.返回驗(yàn)證碼和圖片
return?new?Object[]{sb.toString(),?image};
}
/**
*?隨機(jī)取色
*/
public?static?Color?getRandomColor()?{
Random?ran?=?new?Random();
Color?color?=?new?Color(ran.nextInt(256),?
ran.nextInt(256),?ran.nextInt(256));
return?color;
}
public?static?void?main(String[]?args)?throws?IOException?{
Object[]?objs?=?createImage();
BufferedImage?image?=?(BufferedImage)?objs[1];
OutputStream?os?=?new?FileOutputStream("d:/1.png");
ImageIO.write(image,?"jpeg",?os);
os.close();
}
}
用java隨機(jī)生成四位驗(yàn)證碼，只求編程代碼
我自己做的系統(tǒng)里面用作驗(yàn)證碼的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("當(dāng)前驗(yàn)證碼為:"+session.getAttribute("randNum"));
os.flush();
os.close();
os=null;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
%
/body
/html
求java語言隨機(jī)生成圖片驗(yàn)證碼的程序代碼，有詳細(xì)注釋最好，本人初學(xué)者，謝謝各位的幫忙！?。?/h2>
樓上正解
/**
*?圖片驗(yàn)證碼
*?
*?@author?HuangYong
*?
*/
public?class?CheckCode?extends?HttpServlet?{
private?static?final?long?serialVersionUID?=?1532787236715859525L;
/**
?*?驗(yàn)證圖片寬
?*/
private?static?final?int?WIDTH?=?80;
/**
?*?驗(yàn)證圖片高度
?*/
private?static?final?int?HEIGHT?=?20;
public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)
throws?ServletException,?IOException?{
//?獲得圖片
BufferedImage?image?=?new?BufferedImage(WIDTH,?HEIGHT,
BufferedImage.TYPE_INT_RGB);
//?獲取畫筆
Graphics?g?=?image.getGraphics();
//?設(shè)置邊框
setBounds(g);
//?//?設(shè)置背景
//?setBackGround(g);
//?干擾線
drawRandomLine(g);
//?驗(yàn)證碼
drawRandomString((Graphics2D)?g,?request);
//?發(fā)送給頁面
response.setContentType("image/jpeg");
response.setDateHeader("expries",?-1);
response.setHeader("cache-control",?"no-cache");
response.setHeader("progma",?"no-cache");
ImageIO.write(image,?"jpg",?response.getOutputStream());
}
/**
?*?邊框
?*?
?*?@param?g
?*/
private?void?setBounds(Graphics?g)?{
g.setColor(Color.BLUE);
g.fillRect(0,?0,?WIDTH,?HEIGHT);
g.setColor(Color.WHITE);
g.fillRect(1,?1,?WIDTH?-?2,?HEIGHT?-?2);
}
/**
?*?背景
?*?
?*?@param?g
?*/
//?private?void?setBackGround(Graphics?g)?{
//
//?g.setColor(Color.WHITE);
//?g.drawRect(1,?1,?WIDTH-2,?HEIGHT-2);
//
//?}
/**
?*?干擾線
?*?
?*?@param?g
?*/
private?void?drawRandomLine(Graphics?g)?{
g.setColor(Color.GREEN);
int?x1,?y1;
int?x2,?y2;
Random?r?=?new?Random();
for?(int?i?=?0;?i??5;?i++)?{
//?起始xy
x1?=?r.nextInt(WIDTH);
y1?=?r.nextInt(HEIGHT);
//?結(jié)束xy
x2?=?r.nextInt(WIDTH);
y2?=?r.nextInt(HEIGHT);
g.drawLine(x1,?y1,?x2,?y2);
}
}
/**
?*?驗(yàn)證碼
?*?
?*?@param?g
?*/
private?void?drawRandomString(Graphics2D?g,?HttpServletRequest?request)?{
g.setColor(Color.RED);
g.setFont(new?Font("宋體",?Font.BOLD,?20));
String?base?=?"qwertyupasdfghjkzxcvbnm23456789QWERTYUIOPASDFGHJKLZXCVBNM";
StringBuilder?sb?=?new?StringBuilder();
char?ch?=?'\u0000';
int?degree?=?0;
Random?r?=?new?Random();
int?startX?=?8;
for?(int?i?=?0;?i??4;?i++)?{
ch?=?base.charAt(r.nextInt(base.length()));
//?設(shè)置旋轉(zhuǎn),?±20°
degree?=?r.nextInt()?%?20;
g.rotate(degree?*?Math.PI?/?180,?startX,?14);
g.drawString(ch?+?"",?startX,?16);
//?取消旋轉(zhuǎn)
g.rotate(-degree?*?Math.PI?/?180,?startX,?14);
startX?+=?18;
sb.append(ch);
}
request.getSession().setAttribute("checkCode",?sb.toString().toLowerCase());
}
public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)
throws?ServletException,?IOException?{
doGet(request,?response);
}
希望能幫助你
驗(yàn)證碼部分的java代碼怎么寫
package com.bbs.servlet;
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.io.PrintWriter;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class Image extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("image/jpeg");
OutputStream out = response.getOutputStream();
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
int width = 60, height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
// 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, width, height);
// 設(shè)定字體
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
// 隨機(jī)產(chǎn)生155條干擾線，使圖象中的認(rèn)證碼不易被其它程序探測(cè)到
g.setColor(getRandColor(180, 200));
for (int i = 0; i 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
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(4位數(shù)字)
String sRand =setRandValue(request);
if(sRand!=null)
for (int i = 0; i sRand.length(); i++) {
g.setColor(new Color(20 + random.nextInt(200), 20 + random
.nextInt(200), 20 + random.nextInt(200)));
// 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(sRand.charAt(i) + "", 13 * i + 6, 16);
}
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
// 圖象生效
g.dispose();
// 輸出圖象到頁面
// ImageIO.write(image, "JPG", response.getOutputStream());
out.flush();
out.close();
}
Color getRandColor(int fc, int bc) {// 給定范圍獲得隨機(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);
}
//48-57對(duì)應(yīng)0-9;65-90對(duì)應(yīng)A-Z;97-122對(duì)應(yīng)a-z;
String setRandValue(HttpServletRequest request) {
Random random = new Random();
String sRand = "";
//這里是生成驗(yàn)證碼的位數(shù)
for (int i = 0; i 4; i++) {
char c = 0;
int k = random.nextInt(3);
switch (k) {
case 0:
c = (char) (random.nextInt(10) + 48);
break;
case 1:
c = (char) (random.nextInt(26) + 65);
break;
case 2:
c = (char) (random.nextInt(26) + 97);
}
sRand += c;
}
request.getSession().setAttribute("rands", sRand);
return sRand;
}
}
Java如何實(shí)現(xiàn)驗(yàn)證碼驗(yàn)證功能
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(hào)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(gè)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(gè)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(gè)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(gè)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(gè)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(gè)servlet，用來固定圖片大小，以及處理驗(yàn)證碼的使用場(chǎng)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(qǐng)求?對(duì)應(yīng)的?會(huì)話對(duì)象
HttpSession?session?=?request.getSession();
//?從請(qǐng)求中獲得?URI?(?統(tǒng)一資源標(biāo)識(shí)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(chǔ)到當(dāng)前會(huì)話對(duì)象的屬性中?)
session.setAttribute(uri,?code);
System.out.println(session.getAttribute(uri));
}
}?
接著寫一個(gè)HTML注冊(cè)頁面用來檢驗(yàn)一下：
html
head
meta?charset="UTF-8"
title注冊(cè)/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(cè)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(qǐng)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(qǐng)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(qǐng)確認(rèn)密碼"
/span
/div
div?class="form-row"
span?class="cell-7"
input?type="text"?name="verifyCode"?placeholder="請(qǐng)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(cè)"
/span
/div
/div?!--?注冊(cè)表單結(jié)束?--
/form
/div
/body
/html
效果如下圖：
在控制臺(tái)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(huì)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(huì)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(gè)問號(hào)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(huì)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(gè)?Date?對(duì)象的?一個(gè)?實(shí)例
var?time?=?date.getTime()?;?//?從?新創(chuàng)建的?Date?對(duì)象的實(shí)例中獲得該時(shí)間對(duì)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
當(dāng)前標(biāo)題：java驗(yàn)證碼訓(xùn)練源代碼,java驗(yàn)證碼識(shí)別算法
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