java圖形驗(yàn)證碼代碼 圖形驗(yàn)證碼生成

JAVA識(shí)別圖片驗(yàn)證碼

package com.he;

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import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import java.awt.*;

import java.awt.image.*;

import javax.imageio.*;

public class CodeFact

extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

//設(shè)置頁(yè)面不緩存

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

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(lèi)

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));

//畫(huà)邊框

g.setColor(new Color(33,66,99));

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

// 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(160, 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 = "";

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

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

sRand += rand;

// 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(lái)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(rand, 13 * i + 6, 16);

}

// 將認(rèn)證碼存入SESSION

HttpSession session = request.getSession();

session.setAttribute("rand", sRand);

// 圖象生效

g.dispose();

// 輸出圖象到頁(yè)面

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

}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws

ServletException, IOException {

doGet(request, response);

}

//給定范圍獲得隨機(jī)顏色

private Color getRandColor(int fc, int bc) {

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);

}

}

你試試??!

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;

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(huà)筆

Graphics?graphic?=?image.getGraphics();

//?3.設(shè)置畫(huà)筆顏色

graphic.setColor(Color.LIGHT_GRAY);

//?4.繪制矩形背景

graphic.fillRect(0,?0,?WIDTH,?HEIGHT);

//?5.畫(huà)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(huà)字符

graphic.drawString(

chars[n]?+?"",?i?*?WIDTH?/?SIZE,?HEIGHT?/?2);

//?記錄字符

sb.append(chars[n]);

}

//?6.畫(huà)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(huà)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();

}

}

java web中驗(yàn)證碼代碼??

生成code.jsp文件的完整代碼如下:

%@ page language="java" contentType="image/jpeg; charset=gb2312"

pageEncoding="gb2312"%

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

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

%!

Color getRandColor(int fc,int bc){

Random r=new Random();

if(fc255) fc=255;

if(bc200) bc=255;

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

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

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

return new Color(red,green,blue);

}%

% //設(shè)置頁(yè)面不緩存

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

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

response.setDateHeader("Expires",0);

//創(chuàng)建隨機(jī)類(lèi)

Random r=new Random();

//在內(nèi)存中創(chuàng)建圖像,寬度,高度

int width=80,height=30;

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

//獲取圖形上下文環(huán)境

Graphics gc=pic.getGraphics();

//設(shè)定背景顏色并進(jìn)行填充

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

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

//設(shè)定圖形上下文環(huán)境字體

gc.setFont(new Font("Times New Roman",Font.PLAIN,20));

//畫(huà)邊框

//gc.setColor(new Color(1));

//gc.drawRect(0,0,width-1,height-1);

//隨機(jī)產(chǎn)生200條干擾直線,使圖像中的認(rèn)證碼不易被其他分析程序探測(cè)

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

for(int i=0;i200;i++)

{

int x1=r.nextInt(width);

int y1=r.nextInt(height);

int x2=r.nextInt(15);

int y2=r.nextInt(15);

gc.drawLine(x1,y1,x1+x2,y1+y2);

}

//隨即產(chǎn)生100個(gè)干擾點(diǎn)

gc.setColor(getRandColor(120,240));

for(int i=1;i100;i++){

int x=r.nextInt(width);

int y=r.nextInt(height);

gc.drawOval(x,y,0,0);

}

//隨機(jī)產(chǎn)生四位數(shù)字的驗(yàn)證碼

String RS="";

String rn="";

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

{

//產(chǎn)生十以內(nèi)隨機(jī)數(shù)字

rn=String.valueOf(r.nextInt(10));

RS+=rn;

//將認(rèn)證碼用drawString函數(shù)顯示到圖像里

gc.setColor(new Color(20+r.nextInt(110),20+r.nextInt(110),20+r.nextInt(110)));//使字體顏色效果明顯

gc.drawString(rn,13*i+16,16);

}

//釋放圖形上下文環(huán)境

gc.dispose();

//將認(rèn)證碼RS存入session中共享

session.setAttribute("random",RS);

//輸出生成后的圖象到頁(yè)面

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

out.clear();

out = pageContext.pushBody();

%

使用隨即碼的jsp文件中加入下面一句即可

image src="code.jsp"

驗(yàn)證碼部分的java代碼怎么寫(xiě)

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(lèi)

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(lái)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(yè)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(jiàn),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(jiǎn)單:用到了一個(gè)Graphics類(lèi)在畫(huà)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(huà)板上隨機(jī)生成幾條干擾線。

首先,寫(xiě)一個(gè)驗(yàn)證碼生成幫助類(lèi),用來(lái)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(lèi)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(huà)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(huà)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(lái)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(yè)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(guò))。

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(lèi)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(xiě)一個(gè)HTML注冊(cè)頁(yè)面用來(lái)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(kāi)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(yè)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(lái)實(shí)現(xiàn)。

在img

src="/demo/verify/regist.do"中,添加一個(gè)問(wèn)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(lái)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(wèn)

網(wǎng)站題目:java圖形驗(yàn)證碼代碼 圖形驗(yàn)證碼生成
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