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JSP Verification Code

Source: Internet
Author: User
Tags rand
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A. JSP page

<script language= "javascript" type= "Text/javascript" >
Refresh Verification Code
function Showrand () {
document.getElementById ("random"). src = "<%=path%>/common/image.jsp?date=" + new Date ();
}

</script>

<body>

<p class= "test" id= "P_randcode" style= "Display:none" >
<b> Verification Code </b>
<input type= "text" value= "" class= "Txt_change" id= "Confirmcode" name= "Confirmcode" >
<a style= "Cursor:pointer;align:left" onclick= "Showrand ();" > Change one </a>
<input type= "hidden" id= "Confirmrand" name= "Confirmrand"/>
</p>

</body>

Two. Display the image.jsp of the Verification code picture

<%@ page contenttype= "image/jpeg" import= "com.sun.image.codec.jpeg.*,java.awt.image.*,java.awt.*,java.util.*"% >
<%
Request.setcharacterencoding ("GBK");
Response.setcontenttype ("text/html; CHARSET=GBK ");


String rand = "0000";//randomly generated verification code


if (Request.getparameter ("rand") = null) {
Rand = (String) request.getparameter ("Rand");
Request.getsession (). SetAttribute ("Rand", Rand);
}
try{
Out.clear ();
Response.setcontenttype ("Image/jpeg");
Response.AddHeader ("Pragma", "no-cache");
Response.AddHeader ("Cache-control", "No-cache");
Response.adddateheader ("Expries", 0);
int width =, height = 20;
BufferedImage image = new BufferedImage (width, height,
BUFFEREDIMAGE.TYPE_INT_RGB);
Graphics g = image.getgraphics ();
Random random = new random ();
int fc = $, BC = 255;
if (FC > 255) {
FC = 255;
}
if (BC > 255) {
BC = 255;
}
int red = FC + Random.nextint (BC-FC);
int green = FC + Random.nextint (BC-FC);
int blue = FC + Random.nextint (BC-FC);
Color color = new color (red, green, blue);

G.setcolor (color);
G.setfont (New Font ("Times New Roman", Font.plain, 18));
G.fillrect (0, 0, width, height);

for (int i = 0; i <; 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);
}

int stringlength = 4;
String srand= "";
for (int i = 0; i < stringlength; i++) {
String randstr = string.valueof (Rand.charat (i));
SRAND+=RANDSTR;
G.setcolor (New Color (+ random.nextint), + random
. Nextint (+), + random.nextint (110));
g.DrawString (RANDSTR, * i + 6, 16);
}
Session.setattribute ("Ccode", SRand);
G.dispose ();

Servletoutputstream OutStream = Response.getoutputstream ();
JPEGImageEncoder encoder = Jpegcodec.createjpegencoder (OutStream);
Encoder.encode (image);
Outstream.close ();
Out.clear ();
out = Pagecontext.pushbody ();
} catch (Exception e) {
}
%>

JSP Verification Code

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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