驗證碼的java程序代碼,驗證碼 java

如何用Java代碼段生成四位數(shù)字加字母的驗證碼？

不知道你問的是不是生成這種圖片驗證碼？如果只要一個隨機四位數(shù) 那這行代碼就夠了(new Random().nextInt(9000) + 1000;),如果是生成頁面圖片驗證碼就是下面的了: //設定 響應模式 resp.setContentType("image/jpeg"); // 生成令牌環(huán)數(shù)據(jù); Integer token = new Random().nextInt(9000) + 1000; // 保存令牌環(huán)數(shù)據(jù)到session中 req.getSession().setAttribute(IMAGE_TOKEN_NAME, token); // 生成令牌環(huán)圖片 ServletOutputStream out = resp.getOutputStream(); BufferedImage img = new BufferedImage(60, 20, BufferedImage.TYPE_INT_RGB); Graphics g = img.getGraphics(); g.setColor(Color.YELLOW); g.fillRect(0, 0, img.getWidth(), img.getHeight()); g.setColor(Color.BLUE); g.setFont(new Font("", Font.BOLD, 18)); g.drawString(String.valueOf(token), 10, 16); ImageIO.write(img, "jpg", out); out.close();

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我自己做的系統(tǒng)里面用作驗證碼的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("當前驗證碼為:"+session.getAttribute("randNum")); os.flush(); os.close(); os=null; response.flushBuffer(); out.clear(); out = pageContext.pushBody(); % /body/html

怎樣用java實現(xiàn)驗證碼

package com.servlet;

import java.awt.*;

import java.awt.geom.*;

import java.awt.image.*;

import java.io.*;

import java.util.*;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import javax.imageio.ImageIO;

public class PictureCheckCode extends HttpServlet {

private static final long serialVersionUID = 1L;

public PictureCheckCode() {

super();

}

public void destroy() {

super.destroy();

}

public void init() throws ServletException {

super.init();

}

/*該方法主要作用是獲得隨機生成的顏色*/

public Color getRandColor(int s,int e){

Random random=new Random ();

if(s255) s=255;

if(e255) e=255;

int r,g,b;

r=s+random.nextInt(e-s); //隨機生成RGB顏色中的r值

g=s+random.nextInt(e-s); //隨機生成RGB顏色中的g值

b=s+random.nextInt(e-s); //隨機生成RGB顏色中的b值

return new Color(r,g,b);

}

@Override

public void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//設置不緩存圖片

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

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

response.setDateHeader("Expires", 0);

//指定生成的響應圖片,一定不能缺少這句話,否則錯誤.

response.setContentType("image/jpeg");

int width=86,height=22; //指定生成驗證碼的寬度和高度

BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //創(chuàng)建BufferedImage對象,其作用相當于一圖片

Graphics g=image.getGraphics(); //創(chuàng)建Graphics對象,其作用相當于畫筆

Graphics2D g2d=(Graphics2D)g; //創(chuàng)建Grapchics2D對象

Random random=new Random();

Font mfont=new Font("楷體",Font.BOLD,16); //定義字體樣式

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

g.fillRect(0, 0, width, height); //繪制背景

g.setFont(mfont); //設置字體

g.setColor(getRandColor(180,200));

//繪制100條顏色和位置全部為隨機產生的線條,該線條為2f

for(int i=0;i100;i++){

int x=random.nextInt(width-1);

int y=random.nextInt(height-1);

int x1=random.nextInt(6)+1;

int y1=random.nextInt(12)+1;

BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //定制線條樣式

Line2D line=new Line2D.Double(x,y,x+x1,y+y1);

g2d.setStroke(bs);

g2d.draw(line); //繪制直線

}

//輸出由英文，數(shù)字，和中文隨機組成的驗證文字，具體的組合方式根據(jù)生成隨機數(shù)確定。

String sRand="";

String ctmp="";

int itmp=0;

//制定輸出的驗證碼為四位

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

switch(random.nextInt(3)){

case 1: //生成A-Z的字母

itmp=random.nextInt(26)+65;

ctmp=String.valueOf((char)itmp);

break;

case 2: //生成漢字

String[] rBase={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};

//生成第一位區(qū)碼

int r1=random.nextInt(3)+11;

String str_r1=rBase[r1];

//生成第二位區(qū)碼

int r2;

if(r1==13){

r2=random.nextInt(7);

}else{

r2=random.nextInt(16);

}

String str_r2=rBase[r2];

//生成第一位位碼

int r3=random.nextInt(6)+10;

String str_r3=rBase[r3];

//生成第二位位碼

int r4;

if(r3==10){

r4=random.nextInt(15)+1;

}else if(r3==15){

r4=random.nextInt(15);

}else{

r4=random.nextInt(16);

}

String str_r4=rBase[r4];

//將生成的機內碼轉換為漢字

byte[] bytes=new byte[2];

//將生成的區(qū)碼保存到字節(jié)數(shù)組的第一個元素中

String str_12=str_r1+str_r2;

int tempLow=Integer.parseInt(str_12, 16);

bytes[0]=(byte) tempLow;

//將生成的位碼保存到字節(jié)數(shù)組的第二個元素中

String str_34=str_r3+str_r4;

int tempHigh=Integer.parseInt(str_34, 16);

bytes[1]=(byte)tempHigh;

ctmp=new String(bytes);

break;

default:

itmp=random.nextInt(10)+48;

ctmp=String.valueOf((char)itmp);

break;

}

sRand+=ctmp;

Color color=new Color(20+random.nextInt(110),20+random.nextInt(110),random.nextInt(110));

g.setColor(color);

//將生成的隨機數(shù)進行隨機縮放并旋轉制定角度 PS.建議不要對文字進行縮放與旋轉,因為這樣圖片可能不正常顯示

/*將文字旋轉制定角度*/

Graphics2D g2d_word=(Graphics2D)g;

AffineTransform trans=new AffineTransform();

trans.rotate((45)*3.14/180,15*i+8,7);

/*縮放文字*/

float scaleSize=random.nextFloat()+0.8f;

if(scaleSize1f) scaleSize=1f;

trans.scale(scaleSize, scaleSize);

g2d_word.setTransform(trans);

g.drawString(ctmp, 15*i+18, 14);

}

HttpSession session=request.getSession(true);

session.setAttribute("randCheckCode", sRand);

g.dispose(); //釋放g所占用的系統(tǒng)資源

ImageIO.write(image,"JPEG",response.getOutputStream()); //輸出圖片

}

}

驗證碼部分的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();

// 生成隨機類

Random random = new Random();

// 設定背景色

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

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

// 設定字體

g.setFont(new Font("Times New Roman", Font.PLAIN, 18));

// 隨機產生155條干擾線，使圖象中的認證碼不易被其它程序探測到

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);

}

// 取隨機產生的認證碼(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)));

// 調用函數(shù)出來的顏色相同，可能是因為種子太接近，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對應0-9;65-90對應A-Z;97-122對應a-z;

String setRandValue(HttpServletRequest request) {

Random random = new Random();

String sRand = "";

//這里是生成驗證碼的位數(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;

}

}

用java怎么制作驗證碼

原理:

1.隨機生成4個數(shù)字 用到了Random類

2.對這4個數(shù)字設置字體格式 用 setFont方法

3.改變字體顏色用setColor 然后隨機生成顏色

代碼如下

package s1;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Random;

import javax.imageio.ImageIO;

import javax.jms.Session;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class GetImage extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

this.doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

// 發(fā)送圖片不能夠添加這2行代碼

// response.setContentType("text/html;charset=UTF-8");

// request.setCharacterEncoding("UTF-8");

int width=100;

int height=50;

//獲得一張圖片

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

Graphics g=image.getGraphics();

g.setColor(Color.WHITE);

g.fillRect(1, 1, width-2, height-2);

g.setFont(new Font("宋體",Font.BOLD,30));

Random random=new Random();

// 填充的字符串

String str="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

//緩存生成的驗證碼

StringBuffer stringbuffer=new StringBuffer();

//隨機生成驗證碼的顏色和字符

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

{ //設置隨機顏色

g.setColor(new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)));

int index=random.nextInt(62);//這里的62就是從填充字符段中隨意選取一個位置

String str1=str.substring(index,index+1);

g.drawString(str1, 20*i, 30);//x,y數(shù)值設置太小會顯示不出來

stringbuffer.append(str1);

}

//將生成的驗證碼存到服務器

request.getSession().setAttribute("checkcode", stringbuffer.toString());//key和value

//將圖片發(fā)送給瀏覽器

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

}

}

用戶登錄界面代碼

package s1;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class Login extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");// 設置服務器發(fā)送給瀏覽器的編碼方式

request.setCharacterEncoding("UTF-8"); // 客戶端向服務器提交的數(shù)據(jù)的解碼方式

// 獲得用戶提交的數(shù)據(jù)

String checkcode = request.getParameter("checkcode");

System.out.println(checkcode);

// 判斷輸入的驗證碼是不是符合

HttpSession session = request.getSession();// session是存放數(shù)據(jù)的地方

String str = (String) session.getAttribute("checkcode");

if (str != null) {

if (checkcode.compareToIgnoreCase(str) == 0) // 驗證碼忽略大小寫

response.getWriter().println("驗證碼輸入正確");

else

response.getWriter().println("驗證碼輸入錯誤");

}

else response.getWriter().println("驗證碼失效");

// 使用完的驗證碼信息要刪除,返回原頁面再輸一次,驗證碼就失效了

session.removeAttribute("checkcode");

}

}

怎么用Java代碼實現(xiàn)一個驗證碼，求具體實現(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;

/**

*?生成隨機驗證碼及圖片

*?返回的數(shù)組中，第1個值是驗證碼，第2個值是圖片

*/

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.畫隨機字符

Random?ran?=?new?Random();

for?(int?i?=?0;?i?SIZE;?i++)?{

//?取隨機字符索引

int?n?=?ran.nextInt(chars.length);

//?設置隨機顏色

graphic.setColor(getRandomColor());

//?設置字體大小

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++)?{

//?設置隨機顏色

graphic.setColor(getRandomColor());

//?隨機畫線

graphic.drawLine(ran.nextInt(WIDTH),?ran.nextInt(HEIGHT),

ran.nextInt(WIDTH),?ran.nextInt(HEIGHT));

}

//?7.返回驗證碼和圖片

return?new?Object[]{sb.toString(),?image};

}

/**

*?隨機取色

*/

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();

}

}

當前題目：驗證碼的java程序代碼,驗證碼 java
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