我自己做的系磨廳統裡面用作驗證碼的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(fc>255) fc=255;
if(bc>255) 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",
"耐游神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;i<昌虧50;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;i<4;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>
Ⅱ 驗證碼 代碼
你在java發這個問題！我就把java 的驗證茄備碼源碼給你。
<tr>
<td><font color="#FFFFFF">驗證碼：</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"/><%
//設置頁面不緩存
//response.reset();
response.setContentType("image/jpeg");
response.setHeader("Pragma","沒瞎No-cache"枯納空);
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
//在內存中創建圖象寬60 高18 4個字元 0條干擾線
BufferedImage image = rc.getRandomImage(58, 18, 4, 1);
//設置其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: 隨機碼圖形生成程序的處理 Description:
* 為了加強網路安全，防止黑課工具對系統的攻擊，現在通用隨機碼來解決這個問題，因為每一次產生的隨機碼是隨機的，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 {
/**
* 給定范圍獲得隨機顏色
*
* @param fc
* int 參數1
* @param bc
* int 參數2
* @return Color 返回的color對象
*/
private String strRandomString; // 生成的隨機數
/**
* 取其生成的隨機數
*
* @return String
*/
public String getRandomString() {
return strRandomString;
}
/**
* 設置其生成的隨數
*
* @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1
* @param bc
* int 范圍參數2
* @return Color
*/
private Color getRandColor(int fc, int bc) {
// 取其隨機顏色
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);
}
/**
* 用於生成其隨機數
*
* @param randomCount
* int 隨機數總長度
* @return String 返回的隨機數
*/
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;
// 取其隨機數的總數
int LengthOfRandom = a.length;
// 生成隨機類
Random random = new Random();
// 循環取隨機取其整數,並將其整數所對應的結果進行累加
for (int i = 0; i < nRandomCount; i++) {
nRand = random.nextInt(LengthOfRandom);
strRand += a[nRand];
}
// 返回累加後的結果
return strRand;
}
/**
* 生成其隨機的圖形
*
* @param width
* int 生成圖形的寬度
* @param height
* int 生成圖形的高度
* @param nLengthOfRandom
* int 隨機碼的個數
* @param nDisturbLineCount
* int 干擾線的條數
* @return BufferedImage
*/
public BufferedImage getRandomImage(int nWidth, int nHeight,
int nLengthOfRandom, int nDisturbLineCount)
{
// 在內存中創建圖象
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;
// 生成隨機類
Random random = new Random();
// 設定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, nWidth, nHeight);
// 設定字體
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);
// 隨機產生nDisturbLineCount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(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);
}
// 取隨機產生的認證碼(6位)
strRand = this.getRandomString(nLengthOfRandom);
// 設置其屬性randomString的值
this.strRandomString = strRand;
for (int i = 0; i < nLengthOfRandom; i++) {
// 將認證碼顯示到圖象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));
// 調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
g.drawString(strRand.substring(i, i + 1), 13 * i + 5, 14);
}
// 圖象生效
g.dispose();
return image;
}
}
Ⅲ 怎樣用java實現驗證碼
現在許多系統的注冊 登錄或者發布信息模塊都添加的隨機驗證碼功能 就是為了避免自動注冊程序或者自動發布程序的使用
驗證碼實際上就是隨機選擇一些字元以圖片的形式展現在頁面上 如果進行提交操作的同時需要將圖片上的字元同時提交 如果提交的字元與伺服器session保存的不同 則認為提交基數信息無效 為了避免自動程序分析解析圖片 通常會在圖片上隨機生成一些干擾線或者將字元進行扭曲 增加自動識別驗證碼的難度
在這里 我們使用java實現驗證碼
<%@ page contentType= image/jpeg import= java awt * java awt image * java util * javax imageio * %>
<%!
Color getRandColor(int fc int bc){//給定范圍獲得隨機顏色
Random random = new Random();
if(fc> ) fc= ;
租鋒做if(bc> ) bc= ;
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);
}
%>
<%
//設置頁面不緩存
response setHeader( Pragma No cache );
弊衡response setHeader( Cache Control no cache );
response setDateHeader( Expires );
// 在內存中創建圖象
int width= height= ;
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( ));
g fillRect( width height);
//設定字體
g setFont(new Font( Times New Roman Font PLAIN ));
// 隨機產生 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( ));
for (int i= ;i< ;i++)
{
int x = random nextInt(width);
int y = random nextInt(height);
int xl = random nextInt( );
int yl = random nextInt( );
g drawLine(x y x+xl y+yl);
}
// 取隨機產生的認證碼( 位數字)
String codeList = ;
String sRand= ;
for (int i= ;i< ;i++){
int a=random nextInt(codeList length() );
String rand=codeList substring(a a+ );
sRand+=rand;
// 將認證碼顯示到圖象中
g setColor(new Color( +random nextInt( ) +random nextInt( ) +random nextInt( )));//調用函數出來的顏色相同 可能是因為種子太接近 所以只能直接生成
g drawString(rand *i+ );
}
// 將認證碼存入SESSION
session setAttribute( rand sRand);
// 圖象生效
g dispose();
// 輸出圖象到頁面
ImageIO write(image JPEG response getOutputStream());
out clear();
out = pageContext pushBody();
lishixin/Article/program/Java/hx/201311/25536
Ⅳ 怎樣用java實現驗證碼
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(s>255) s=255;
if(e>255) 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); //創建BufferedImage對象,其作用相當於一圖片
Graphics g=image.getGraphics(); //創建Graphics對象,其作用相當於畫筆
Graphics2D g2d=(Graphics2D)g; //創建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;i<100;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); //定製線條樣式
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，數字，和中文隨機組成的驗證文字，具體的組合方式根據生成隨機數確定。
String sRand="";
String ctmp="";
int itmp=0;
//制定輸出的驗證碼為四位
for(int i=0;i<4;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"};
//生成第一位區碼
int r1=random.nextInt(3)+11;
String str_r1=rBase[r1];
//生成第二位區碼
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];
//將生成的區碼保存到位元組數組的第一個元素中
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位元組數組的第二個元素中
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);
//將生成的隨機數進行隨機縮放並旋轉制定角度 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(scaleSize>1f) 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所佔用的系統資源
ImageIO.write(image,"JPEG",response.getOutputStream()); //輸出圖片
}
}
Ⅳ 求Java大神給個代碼！計算驗證條形碼
public class Ean13Barcode {
private String code;
public Ean13Barcode(String code) {
super();
this.code = code;
}
public String encode() {
if (null == code) {
return "";
}
char[] codes = code.toCharArray();
int sum = 0;
for (int i = 0; i < codes.length; i++) {
int num = codes[i] - '純御0';
if (isEven(num)) {
sum += num;
} else {
sum += num * 3;
}
}
int x = sum % 10;
return code + (x == 0 ? 0 : 10 - x);
}
private boolean isEven(int x) {
return x % 2 == 0;
}
public static void main(String[] args) {
System.out.println(new Ean13Barcode("做配岩692223361219"賣悶).encode());
}
}
Ⅵ 用java怎麼製作驗證碼
原理:
1.隨機生成4個數字 用到了Random類
2.對這4個數字設置字體格式 用 setFont方法
3.改變字體顏色用setColor 然後隨機生成顏色
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();
/虛枯兄/ 填充的字元串
String str="";
//緩存生成的驗證碼敗橘
StringBuffer stringbuffer=new StringBuffer();
//隨機生成驗證碼的顏差襲色和字元
for(int i=0;i<4;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就是從填充字元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數值設置太小會顯示不出來
stringbuffer.append(str1);
}
//將生成的驗證碼存到伺服器
request.getSession().setAttribute("checkcode", stringbuffer.toString());//key和value
//將圖片發送給瀏覽器
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");// 設置伺服器發送給瀏覽器的編碼方式
request.setCharacterEncoding("UTF-8"); // 客戶端向伺服器提交的數據的解碼方式
// 獲得用戶提交的數據
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是存放數據的地方
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");
}
}
Ⅶ Java如何實現驗證碼驗證功能
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 { // 驗證碼字元集 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'}; // 字元數量 private static final int SIZE = 4; // 干擾線數量 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.畫隨機字元 Random ran = new Random(); for (int i = 0; i <SIZE; i++) { // 取隨機字元索引 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)); // 畫字元 graphic.drawString( chars[n] + "", i * WIDTH / SIZE, HEIGHT / 2); // 記錄字元 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(); } }
Ⅷ java 登陸時的驗證碼怎麼做
後台寫一個生成圖片隨機的代碼，生成圖片給前台。切換圖片的時候，使用ajax獲取圖片數據就行。
附上生成圖片的代碼
public class ValidateCode {
private int width=180;
private int height=60;
private int codeCount = 4;
private int x = 0;
private int codeY;
private String Code;
private BufferedImage buffImg;
static char[] codeSequence = { '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', 'o', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
private int fontHeight;
public ValidateCode() {
x = width / (codeCount + 2);
fontHeight = height - 2;
codeY = height - 4;
CreateCode();
}
public void CreateCode(){
// 定義圖像buffer
BufferedImage buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
Graphics2D g = buffImg.createGraphics();
// 創建一個隨機數生成器類
Random random = new Random();
// 將圖像填充為白色
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
// 創建字體，字體的大小應該根據圖片的高度來定。
Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
// 設置字體。
g.setFont(font);
// 畫邊框。
g.setColor(Color.BLACK);
g.drawRect(0, 0, width - 1, height - 1);
// randomCode用於保存隨機產生的驗證碼，以便用戶登錄後進行驗證。
StringBuffer randomCode = new StringBuffer();
int red = 0, green = 0, blue = 0;
// 隨機產生codeCount數字的驗證碼。
for (int i = 0; i < codeCount; i++) {
// 得到隨機產生的驗證碼數字。
String strRand = String.valueOf(codeSequence[random.nextInt(62)]);
// 產生隨機的顏色分量來構造顏色值，這樣輸出的每位數字的顏色值都將不同。
red = random.nextInt(255);
green = random.nextInt(255);
blue = random.nextInt(255);
// 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, (i ) * x+20, codeY);
// 將產生的四個隨機數組合在一起。
randomCode.append(strRand);
}
this.Code=randomCode.toString().toUpperCase();
this.buffImg=buffImg;
}
public String getCode() {
return Code;
}
public void setCode(String code) {
Code = code;
}
public BufferedImage getBuffImg() {
return buffImg;
}
public void setBuffImg(BufferedImage buffImg) {
this.buffImg = buffImg;
}
}
Ⅸ 求一個Java語言編寫的gif動態驗證碼 就是百度注冊用戶的那種
這個問題有點難度,PHP的好實現,但是java的就不那麼好實現了,目前我正在搞
Ⅹ java驗證碼怎麼做
下面是實現驗證碼中，最難的一塊----畫圖片，我這個支持中文驗證碼，我把代碼貼上，如果要整個項目的話，我發給你。
package SMART.JRSOFT.IDENTTIFYINGCODE;
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 java.util.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.servlet.http.*;
import org.apache.commons.lang.RandomStringUtils;
public class getimg extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
* Constructor of the object.
*/
public getimg() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
// 定義圖片長度和寬度
int width=176, height=30;
// 創建內存圖像
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
// 驗證碼圖形顯示為數字和英文字母
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("Times New Roman",Font.BOLD,18));
g.setColor(new Color(255,255,255));
g.drawRect(0,0,width-1,height-1);
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);
}
// 隨機獲取四位字母或數字型字元
String s = RandomStringUtils.random(4,false,true);
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
// 將字元畫到圖片上
g.drawString(s,6,20);
/* 顯示漢字驗證碼
// 設置備選漢字，剔除一些不雅的漢字
String base = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
// 備選漢字的長度
int length = base.length();
// 設定圖像背景色(因為是做背景，所以偏淡)
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 備選字體
String[] fontTypes = {"\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66"};
int fontTypesLength = fontTypes.length;
// 在圖片背景上增加噪點
g.setColor(getRandColor(160, 200));
g.setFont(new Font("Times New Roman", Font.PLAIN, 14));
for (int i = 0; i < 6; i++) {
g.drawString("*********************************************", 0, 5 * (i + 2));
}
String s = "";
for (int i = 0; i < 6; i++) {
int start = random.nextInt(length);
String rand = base.substring(start, start + 1);
s += rand;
//設置字體的顏色
g.setColor(getRandColor(10, 150));
//設置字體
g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 18 + random.nextInt(6)));
//將此漢字畫到圖片上
g.drawString(rand, 24 * i + 10 + random.nextInt(8), 24);
}
*/
HttpSession session=request.getSession();
session.setAttribute("rand",s);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
}
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);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException {
// Put your code here
}
}