各位高手大哥门有没有人知道如何在jsp页面中产生验证码啊 问题是如何在jsp页面中产生验证码 有哪位大哥教育教育小弟撒 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 <%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %><%// 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();// 设定背景色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);// 取随机产生的认证码(4位数字)String rand = request.getParameter("rand");rand = rand.substring(0,rand.indexOf("."));switch(rand.length()){case 1: rand = "000"+rand; break;case 2: rand = "00"+rand; break;case 3: rand = "0"+rand; break;default: rand = rand.substring(0,4); break;}// 将认证码存入SESSIONsession.setAttribute("rand",rand);// 将认证码显示到图象中g.setColor(Color.black);Integer tempNumber = new Integer(rand);String numberStr = tempNumber.toString();g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));String Str = numberStr.substring(0,1);g.drawString(Str,8,17);Str = numberStr.substring(1,2);g.drawString(Str,20,15);Str = numberStr.substring(2,3);g.drawString(Str,35,18);Str = numberStr.substring(3,4);g.drawString(Str,45,15);// 随机产生88个干扰点,使图象中的认证码不易被其它程序探测到Random random = new Random();for (int i=0;i<20;i++){int x = random.nextInt(width);int y = random.nextInt(height);g.drawOval(x,y,0,0);}// 图象生效g.dispose();// 输出图象到页面ImageIO.write(image, "JPEG", response.getOutputStream());%> 修改一下<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %><%// 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();// 设定背景色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);// 取随机产生的认证码(4位数字)//String rand = request.getParameter("rand");Random r = new Random();String rand = (1000+r.nextInt(9999)) + "";// 将认证码存入SESSIONsession.setAttribute("rand",rand);// 将认证码显示到图象中g.setColor(Color.black);Integer tempNumber = new Integer(rand);String numberStr = tempNumber.toString();g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));String Str = numberStr.substring(0,1);g.drawString(Str,8,17);Str = numberStr.substring(1,2);g.drawString(Str,20,15);Str = numberStr.substring(2,3);g.drawString(Str,35,18);Str = numberStr.substring(3,4);g.drawString(Str,45,15);// 随机产生88个干扰点,使图象中的认证码不易被其它程序探测到Random random = new Random();for (int i=0;i<20;i++){int x = random.nextInt(width);int y = random.nextInt(height);g.drawOval(x,y,0,0);}// 图象生效g.dispose();// 输出图象到页面ImageIO.write(image, "JPEG", response.getOutputStream());%> 产生验证码图片的文件-----image.jsp<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %><%!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<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SESSIONsession.setAttribute("rand",sRand);// 图象生效g.dispose();// 输出图象到页面ImageIO.write(image, "JPEG", response.getOutputStream());%> ---------------使用验证码图片的文件---------a.jsp-----------------------------------<%@ page contentType="text/html;charset=gb2312" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>认证码输入页面</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> </head><body><form method=post action="check.jsp"><table><tr><td align=left>系统产生的认证码:</td><td><img border=0 src="image.jsp"></td></tr><tr><td align=left>输入上面的认证码:</td><td><input type=text name=rand maxlength=4 value=""></td></tr><tr><td colspan=2 align=center><input type=submit value="提交检测"></td></tr></form></body></html> -----------------验证的页面----------check.jsp<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %><html><head><title>认证码验证页面</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><META HTTP-EQUIV="Pragma" CONTENT="no-cache"> <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"> <META HTTP-EQUIV="Expires" CONTENT="0"> </head><body><% String rand = (String)session.getAttribute("rand"); String input = request.getParameter("rand");%>系统产生的认证码为: <%= rand %><br>您输入的认证码为: <%= input %><br><br><% if (rand.equals(input)) {%><font color=green>输入相同,认证成功!</font><% } else {%><font color=red>输入不同,认证失败!</font><% }%></body></html> 在Myeclipse中jsp连接数据库 代码 大侠一定进来看看:有没有发现log4j漏写日志的现象?严重求救 jsp页面打开报错,请各位看看是什么原因? mysql有没有自动编号的数据类型啊 用smart上传文件后如何把它删除? JSP页面间的参数传递 在win2000平台和linux平台下的jsp编写代码有没有区别?resin和tomcat呢? Webservice 中 用动态生成客户端的方法调用时出现错误。 为什么出现这个错误! jstree怎样不记录以前选择到记录。 一个超连接的小问题 请问为什么我的文章里面会有部分乱码,但刷新一下就好了呢?
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%
// 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();// 设定背景色
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);// 取随机产生的认证码(4位数字)
String rand = request.getParameter("rand");
rand = rand.substring(0,rand.indexOf("."));
switch(rand.length())
{
case 1: rand = "000"+rand; break;
case 2: rand = "00"+rand; break;
case 3: rand = "0"+rand; break;
default: rand = rand.substring(0,4); break;
}// 将认证码存入SESSION
session.setAttribute("rand",rand);// 将认证码显示到图象中
g.setColor(Color.black);
Integer tempNumber = new Integer(rand);
String numberStr = tempNumber.toString();g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
String Str = numberStr.substring(0,1);
g.drawString(Str,8,17);Str = numberStr.substring(1,2);
g.drawString(Str,20,15);
Str = numberStr.substring(2,3);
g.drawString(Str,35,18);Str = numberStr.substring(3,4);
g.drawString(Str,45,15);// 随机产生88个干扰点,使图象中的认证码不易被其它程序探测到
Random random = new Random();
for (int i=0;i<20;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
g.drawOval(x,y,0,0);
}// 图象生效
g.dispose();// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%
// 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();// 设定背景色
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);// 取随机产生的认证码(4位数字)
//String rand = request.getParameter("rand");
Random r = new Random();
String rand = (1000+r.nextInt(9999)) + "";
// 将认证码存入SESSION
session.setAttribute("rand",rand);// 将认证码显示到图象中
g.setColor(Color.black);
Integer tempNumber = new Integer(rand);
String numberStr = tempNumber.toString();g.setFont(new Font("Atlantic Inline",Font.PLAIN,18));
String Str = numberStr.substring(0,1);
g.drawString(Str,8,17);Str = numberStr.substring(1,2);
g.drawString(Str,20,15);
Str = numberStr.substring(2,3);
g.drawString(Str,35,18);Str = numberStr.substring(3,4);
g.drawString(Str,45,15);// 随机产生88个干扰点,使图象中的认证码不易被其它程序探测到
Random random = new Random();
for (int i=0;i<20;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
g.drawOval(x,y,0,0);
}// 图象生效
g.dispose();// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
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<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("rand",sRand);
// 图象生效
g.dispose();// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
%> ---------------使用验证码图片的文件---------a.jsp-----------------------------------<%@ page contentType="text/html;charset=gb2312" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>认证码输入页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
</head>
<body>
<form method=post action="check.jsp">
<table>
<tr>
<td align=left>系统产生的认证码:</td>
<td><img border=0 src="image.jsp"></td>
</tr>
<tr>
<td align=left>输入上面的认证码:</td>
<td><input type=text name=rand maxlength=4 value=""></td>
</tr>
<tr>
<td colspan=2 align=center><input type=submit value="提交检测"></td>
</tr>
</form>
</body>
</html> -----------------验证的页面----------check.jsp<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<title>认证码验证页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<META HTTP-EQUIV="Cache-Control" CONTENT="no-cache">
<META HTTP-EQUIV="Expires" CONTENT="0">
</head><body>
<%
String rand = (String)session.getAttribute("rand");
String input = request.getParameter("rand");
%>
系统产生的认证码为: <%= rand %><br>
您输入的认证码为: <%= input %><br>
<br>
<%
if (rand.equals(input)) {
%>
<font color=green>输入相同,认证成功!</font>
<%
} else {
%>
<font color=red>输入不同,认证失败!</font>
<%
}
%>
</body>
</html>