jsp验证码代码(html验证码代码)
admin 发布:2022-12-19 11:40 113
今天给各位分享jsp验证码代码的知识,其中也会对html验证码代码进行解释,如果能碰巧解决你现在面临的问题,别忘了关注本站,现在开始吧!
本文目录一览:
- 1、jsp中,如何判断验证码正确?
- 2、在java页面上,用jsp,怎样写一个验证码
- 3、jsp 验证码不区分大小写代码
- 4、jsp中显示验证码的代码怎么写?
- 5、JSP无法显示验证码~(懂的入)答对了我再加分!
jsp中,如何判断验证码正确?
这个功能通常一共3个页面:
index.jsp是用来登录用的,在其中显示验证码,即img src="image.jsp"/
image.jsp是用来生成验证码的,有注释,很详细,如再不行,你复制到百度就有详解了。
result.jsp 是用来判断输入是否正确的。
相信你一定能看明白...别忘了采纳哦,谢谢。。。
【1.index.jsp】
%@ page language="java" import="java.util.*" pageEncoding="GBK"%
htmlbody
form method=post action="result.jsp"
input type=text name=input maxlength=4
img border=0 src="image.jsp"
input type="submit" value="submit"
/form/body/html
【2.image.jsp】
%@ page contentType="image/JPEG"
import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*"
pageEncoding="GBK"%
%!Color getRandColor(int fc, int bc) {//给定范围获得随机颜色
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);
}%
%
//设置页面不缓存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
// 在内存中创建图象
int width = 60, height = 20;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
//生成随机类
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
//设定字体
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
//画边框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
for (int i = 0; i 100; 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);
}
// 取随机产生的认证码(4位数字)
String sRand = "";
for (int i = 0; i 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
// 将认证码显示到图象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));//调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成
g.drawString(rand, 13 * i + 6, 16);
}
// 将认证码存入SESSION
session.setAttribute("code", sRand);
// 图象生效
g.dispose();
// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
%
【3.result.jsp】
%@ page language="java" import="java.util.*" pageEncoding="GBK"%
htmlbody
%
String input=request.getParameter("input");
String code=(String)session.getAttribute("code");
if(input.equals(code)){
out.println("验证成功!");
}else{
out.println("验证失败!");
}
%
bodyhtml
在java页面上,用jsp,怎样写一个验证码
//验证码生成页面
%@ page language="java" import="java.util.*" pageEncoding="GBK"%
%@ page import = " java.awt.*,java.awt.image.*,javax.imageio.* " %
%@ page import = " java.io.OutputStream " %
%!
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);
}
%
%
try {
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);
OutputStream os = response.getOutputStream();
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor( 200 , 250 ));
g.fillRect( 0 , 0 , width, height);
g.setFont( new Font( " Times New Roman " ,Font.PLAIN, 18 ));
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);
}
String sRand = "" ;
for ( int i = 0 ;i 4 ;i ++ ){
String rand = String.valueOf(random.nextInt( 10 ));
sRand += rand;
g.setColor( new Color( 20 + random.nextInt( 110 ), 20 + random.nextInt( 110 ), 20 + random.nextInt( 110 )));
g.drawString(rand, 13 * i + 6 , 16 );
}
session.setAttribute("vcode" ,sRand);
g.dispose();
ImageIO.write(image, "jpg" ,os);
os.flush();
os.close();
os = null ;
response.flushBuffer();
out.clear();
out = pageContext.pushBody();
}
catch (IllegalStateException e)
{
System.out.println(e.getMessage());
e.printStackTrace();
} %
//验证码使用页面
%@ page language="java" import="java.util.*" pageEncoding="gbk"%
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
base href="%=basePath%"
titleMy JSP 'index.jsp' starting page/title
meta http-equiv="pragma" content="no-cache"
meta http-equiv="cache-control" content="no-cache"
meta http-equiv="expires" content="0"
meta http-equiv="keywords" content="keyword1,keyword2,keyword3"
meta http-equiv="description" content="This is my page"
!--
link rel="stylesheet" type="text/css" href="styles.css"
--
script type="text/javascript"
function refresh(){
var co=document.getElementById("code");
co.src="vcode.jsp?vcode="+Math.random();
}
/script
/head
body
用户名:input type="text" name="name"br/
img id="code" title="验证码" src="vcode.jsp" a href="javascript:refresh();"换一张/a
/body
/html
jsp 验证码不区分大小写代码
验证码字符.toLowerCase() 转换成小写和后台验证数据进行比较 即可无视大小写.
jsp中显示验证码的代码怎么写?
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;
/*生成验证码图片
*/
public class MakeCertPic {
//验证码图片中可以出现的字符集,可以根据需要修改
private char mapTable[]={
'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','0','1','2','3',
'4','5','6','7','8','9'
};
/* 功能:生成彩色验证码图片
参数wedth为生成图片的宽度,参数height为生成图片的高度,参数os为页面的输出流
*/
public String getCertPic(int width,int height,OutputStream os){
if(width=0)
width=60;
if(height=0)
height=20;
BufferedImage image= new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
//获取图形上下文
Graphics g = image.getGraphics();
//设定背景颜色
g.setColor(new Color(0xDCDCDC));
g.fillRect(0,0,width,height);
//画边框
g.setColor(Color.black);
g.drawRect(0,0,width-1,height-1);
//随机产生的验证码
String strEnsure = "";
//4代表4为验证码,如果要产生更多位的验证码,则加大数值
for(int i = 0;i4;++i){
strEnsure += mapTable[(int) (mapTable.length*Math.random())];
}
//将认证码显示到图像中,如果要生成更多位的验证码,增加drawString语句
g.setColor(Color.black);
g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
String str = strEnsure.substring(0,1);
g.drawString(str,8,17);
str = strEnsure.substring(1,2);
g.drawString(str, 20, 15);
str = strEnsure.substring(2,3);
g.drawString(str, 35, 18);
str = strEnsure.substring(3,4);
g.drawString(str, 45, 15);
//随机产生15个干扰点
Random rand = new Random();
for(int i=0; i10; i++){
int x = rand.nextInt(width);
int y = rand.nextInt(height);
g.drawOval(x,y,1,1);
}
//释放图形上下文
g.dispose();
try{
//输出图形到页面
ImageIO.write(image, "JPEG", os);
}catch (IOException e){
return "";
}
return strEnsure;
}
}
makeCertPic.jsp页面用于调用生成验证码图片的JavaBean,并在客户端显示,源代码如下:
%@page contentType="image/jpeg" %%@page language="java" pageEncoding="utf-8"%jsp:useBean id="image" scope="page" class="securityCode.pic.MakeCertPic"/%
String str = image.getCertPic(0,0,response.getOutputStream());
//将验证码存入session中
session.setAttribute("certCode",str);
%
下边是登录页面:
%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%
!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" ""
html
head
meta http-equiv="Content-Type" content="text/html; charset=UTF-8"
title验证码测试登录页面/title
script type="text/javascript"
function changeimg()
{
var myimg = document.getElementById("code");
now = new Date();
myimg.src="makeCertPic.jsp?code="+now.getTime();
}
/script
/head
body
center
form action="loginCheck.jsp" method="post" /
用户名:input type="text" name="username" /br
密nbsp;nbsp;码:input type="password" name="password"/br
nbsp;验证码:input type="text" name="certCode"/
img id="code" src="makeCertPic.jsp"a href="javascript:changeimg()"看不清,换一张 /abr
input type="submit" value="登录"/
/form
/center
/body
/html
JSP无法显示验证码~(懂的入)答对了我再加分!
匿名的提问,真不放心
function riwrite(){
var s = "img src=/200909/login/imgcheck/img.jsp";
document.getElementById("image").innerHTML=s;
}
----》》》
function riwrite(){
var s = "img src=/200909/login/imgcheck/img.jsp?"+Math.random()+"";
document.getElementById("image").innerHTML=s;
}
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