image.jsp------------------------------鐢熸垚闅忔満楠岃瘉鐮佸浘鐗囩殑Jsp椤甸潰
浠ｇ爜濡備笅锛毬?
澶嶅埗浠ｇ爜 浠ｇ爜濡備笅:
<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
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);
}
%>
<%
out.clear();//杩欏彞閽堝resin鏈嶅姟鍣紝濡傛灉鏄痶omacat鍙互涓嶈杩欏彞
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);
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);
}
// 灏嗚璇佺爜瀛樺叆SESSION
session.setAttribute("rand",sRand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>
logic.jsp--------------------------------鐧婚檰椤甸潰锛屽湪杩欓噷鎻愪緵杈撳叆楠岃瘉鐮佺劧鍚庢彁浜ゅ苟楠岃瘉
浠ｇ爜濡備笅锛毬?
澶嶅埗浠ｇ爜 浠ｇ爜濡備笅:
<%@ page contentType="text/html;charset=gbk" %>
<%@ page language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>鐢ㄦ埛鐧诲綍</title>
<script language="javascript">
function loadimage(){
document.getElementById("randImage").src = "image.jsp?"+Math.random();
} Java鍏嶈垂瀛︿範聽聽聽Java鑷缃懧?http://www.javalearns.com
</script>
</head>
<body>
<table width="256" cellpadding="0" cellspacing="0">
<!--DWLayoutTable-->
<form action="validate.jsp" method="post" name="loginForm">
<tr>
<td width="118" height="22" valign="middle" align="center"><input type="text" name="rand" size="15"></td>
<td width="138" valign="middle" align="center"><img alt="code..." name="randImage" id="randImage" src="image.jsp" width="60" height="20" align="absmiddle"></td>
</tr>
<tr>
<td height="36" colspan="2" align="center" valign="middle"><a href="javascript:loadimage();" target="_blank" rel="external nofollow" ><font class=pt95>鐪嬩笉娓呯偣鎴?lt;/font></a></td>
</tr>
<tr>
<td height="36" colspan="2" align="center" valign="middle"><input type="submit" name="login" value="鎻愪氦"></td>
</tr>
</form>
</table>
</body>
</html>
validate.jsp--------------------------鐢ㄦ潵楠岃瘉杈撳叆鐨勯獙璇佺爜鏄惁姝ｇ‘
浠ｇ爜濡備笅锛?
澶嶅埗浠ｇ爜 浠ｇ爜濡備笅:
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%
String rand = (String)session.getAttribute("rand");
String input = request.getParameter("rand");
if(rand.equals(input)){
out.print("<script>alert('楠岃瘉閫氳繃锛?);</script>");
} else{
out.print("<script>alert('璇疯緭鍏ユ纭殑楠岃瘉鐮侊紒');location.href='login.jsp';</script>");
}
%>
浠ヤ笂涓変釜JSP椤甸潰鏀惧湪鍜學EB-INF鍚岀骇鐩綍涓嬶紝濡傛灉浣犳斁鍦ㄤ笉鍚岀殑鏂囦欢澶逛笅锛岄偅涔堥噷闈㈢浉鍏抽〉闈㈢殑璺緞鑷繁绋嶄綔鏇存敼灏卞彲浠ヤ簡銆偮?
Java鍏嶈垂瀛︿範聽聽聽Java鑷缃懧爃ttp://www.javalearns.com
鍏虫敞寰俊鍙凤細javalearns聽聽 闅忔椂闅忓湴瀛ava
鎴栨壂涓€鎵?
闅忔椂闅忓湴瀛ava
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