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Javaweb Creating a verification code using an HTML page

Source: Internet
Author: User
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Verification code is required for login in the actual project, followed by the captcha technique used in my Web projectindex.html 
1 <!DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en">2 <HTML>3   <Head>4     <title>Index.html</title>5     <Metahttp-equiv= "keywords"content= "Keyword1,keyword2,keyword3">6     <Metahttp-equiv= "description"content= "This is my page">7     <Metahttp-equiv= "Content-type"content= "text/html; charset=utf-8">8     <!--<link rel= "stylesheet" type= "Text/css" href= "./styles.css" > -9   </Head>Ten    <Scripttype= "Text/javascript"> One    functionClk_image () { A     varimg=document.getElementById ("scodeimg");  - img.src= "validate.jsp?" +math.random (); - } the    </Script> -   <Body> -    <inputtype= "text"name= "Code"ID= "Code"/> -     <imgID= "Scodeimg"alt= "Please enter verification code"src= "validate.jsp?,math.random ();"onclick= "return Clk_image ();"width= " +"Height= "+"> +   </Body> - </HTML>
View Codevalidate.jsp 
1<%@ page contenttype= "text ml;charset=utf-8" language= "java"%>2<%@ pageImport= "Java.awt.*"%>3<%@ pageImport= "Java.awt.image.*"%>4<%@ pageImport= "Java.util.*"%>5<%@ pageImport= "Javax.imageio.*"%>6  7<%! Color Getrandcolor (intFcintBC) {8Random random =NewRandom ();9         if(FC > 255)TenFC = 255; One         if(BC > 255) ABC = 255; -         intr = FC + random.nextint (BC-FC); -         intg = FC + random.nextint (BC-FC); the         intB = fc + random.nextint (BC-FC); -         return NewColor (R, G, b); -}%> -<% +Response.setheader ("Pragma", "No-cache"); -Response.setheader ("Cache-control", "No-cache"); +Response.setdateheader ("Expires", 0); A     intwidth = 60; at     intHeight = 20; -BufferedImage image =Newbufferedimage (width, height, - Bufferedimage.type_int_rgb); -Graphics g =image.getgraphics (); -Random random =NewRandom (); -G.setcolor (Getrandcolor (200, 250)); inG.fillrect (0, 0, width, height); -G.setfont (NewFont ("Times New Roman", Font.plain, 18)); toG.setcolor (Getrandcolor (160, 200)); +      for(inti = 0; I < 155; i++) { -         intx =random.nextint (width); the         inty =random.nextint (height); *         intX1 = Random.nextint (12); $         intY1 = Random.nextint (12);Panax NotoginsengG.drawline (x, y, x + x1, y +y1); -     } theString SRand = ""; +      for(inti = 0; I < 4; i++) { AString rand = string.valueof (Random.nextint (10)); theSRand + =Rand; +G.setcolor (NewColor (+ random.nextint (110), 20 +Random -. Nextint (+), + random.nextint (110))); $g.DrawString (Rand, * i + 6, 16); $     } -     //Save the Verification code to the session, and then check it out and compare the user input when the login is validated. -Session.setattribute ("Checkcode", SRand); the g.dispose (); -Imageio.write (Image, "JPEG", Response.getoutputstream ());Wuyi out.clear (); theout =pagecontext.pushbody (); -%>
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Javaweb Creating a verification code using an HTML page

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