java驗證碼代碼

1、java 驗證碼代碼（轉(zhuǎn)）產(chǎn)生圖片 servletimportjava.awt.Color;importjava.awt.Font;importjava.awt.Graphics2D;importjava.awt.image.Bufferedlmage;importjava.util.Random;importjavax.imageio.ImagelO;importjavax.servlet.ServletException;importjavax.servlet.ServletOutputStream;importjavax.servlet.http.HttpServlet;importja

2、vax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importjavax.servlet.http.HttpSession;/* Packagename:com.skcc.sample.actionFilename:VerifyCodeServlet.java* Author:AdministratorDate:2008-9-4Description:VerifyCodeServlet*/publicclassVerifyCodeServletextendsHttpServlet/*

3、/*驗證碼圖片的寬度。*/privateintwidth=60;/*驗證碼圖片的高度。*/privateintheight=20;/*驗證碼字符個數(shù)privatestaticfinallongserialVersionUID=1L;J*/private/*xx*/private/*intcodeCount=4;intxx=0;*字體高度*/privateintfontHeight/*codeY*/privateintcodeY/*codeSequence*/char codeSequenceABC,DEFG,HW,K,L,M,N:,O,P,Q,R,S,T,UX,Y,Z,0,1,2,3,4,5,

4、6,7IV89;/*初始化驗證圖片屬性*/publicvoidinit()throwsServletException/從web.xml中獲取初始信息寬度StringstrWidth=/高度StringstrHeight=/字符個數(shù)StringstrCodeCount=thisthis.getInitParameter(.getInitParameter(this.getInitParameter(widthheight/將配置的信息轉(zhuǎn)換成數(shù)值tryif(strWidth!=null&strWidth.length()!=0)width=Integer.parseInt(strWidt

5、h);););codeCount);null&strCodeCount.length()!=0)parseInt(strCodeCount);)catch(NumberFormatExceptione)e.printStackTrace();xx=width/(codeCount+1);codeY=height-4;Graphics2Dgd=buffImg.createGraphics();/創(chuàng)建一個隨機數(shù)生成器類/創(chuàng)建字體，字體的大小應(yīng)該根據(jù)圖片的高度來定。/設(shè)置字體。gd.setFont(font);)if(strHeight!=null&strHeight.length(

6、)!=0)height=Integer.parseInt(strHeight);Fontfont=newFont(Fixedsys,Font.PLAIN,fontHeight);)if(strCodeCount!=codeCount=Integer.fontHeightheight-2;/*paramparamreq*/throwsthrowsrespServletExceptionjava.io.IOExceptionprotectedresp)voidservice(HttpServletRequestreq,HttpServletResponsethrowsServletExceptio

7、n,java.io.IOException/定義圖像 bufferBufferedImagebuffImg=BufferedImage.newBufferedImage(TYPE_INT_RGB);widthheightRandomrandom=newRandom();/將圖像填充為白色gd.setColor(Color.gd.fillRect(0,0,WHITE);width,height);BLACK);width-1,height-1);/隨機產(chǎn)生 160 條干擾線，使圖象中的認證碼不易被其它程序探測到。gd.setColor(Color.BLACK);for(inti=0;i160;i

8、+)intx=random.nextInt(width);inty=random.nextInt(height);intxl=random.nextInt(12);intyl=random.nextInt(12);gd.drawLine(x,y,x+xl,y+yl);)/randomCode 用于保存隨機產(chǎn)生的驗證碼，以便用戶登錄后進行驗證。StringBufferrandomCode=newStringBuffer();intred=0,green=0,blue=0;/隨機產(chǎn)生 codeCount 數(shù)字的驗證碼。for(inti=0;icodeCount;i+)/得到隨機產(chǎn)生的驗證碼數(shù)字。S

9、tringstrRand=String.valueOf(codeSequencerandom.nextInt(36);/產(chǎn)生隨機的顏色分量來構(gòu)造顏色值，這樣輸出的每位數(shù)字的顏色值都將不同red=random.nextInt(255);green=random.nextInt(255);blue=random.nextInt(255);/用隨機產(chǎn)生的顏色將驗證碼繪制到圖像中。gd.setColor(newColor(red,green,blue);gd.drawString(strRand,(i+1)*xx,codeY);/將產(chǎn)生的四個隨機數(shù)組合在一起。randomCode.append(str

10、Rand);)/將四位數(shù)字的驗證碼保存到 Session 中。HttpSessionsession=req.getSession();session.setAttribute(validateCode,randomCode.toString();/禁.止圖像緩存。resp.setHeader(Pragma,no-cache);resp.setHeader(Cache-Control,no-cache);resp.setDateHeader(Expires,0);/畫邊框。gd.setColor(Color.gd.drawRect(0,0,/* ThedoGetmethodoftheservle

11、t.* Thismethodiscalledwhenaformhasitstagvaluemethodequalstoget.* paramrequest* therequestsendbytheclienttotheserver* paramresponse* theresponsesendbytheservertotheclient* throwsServletExceptionresp.setContentType(image/jpeg);/將圖像輸出到 Servlet 輸出流中。ServletOutputStreamsos=resp.getOutputStream();ImageIO.

12、write(buffImg,jpeg,sos);sos.close();產(chǎn)生結(jié)果 servletimportjava.io.IOException;importjava.io.PrintWriter;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;/*Packagename:com.skcc.sample.actionF

13、ilename:ResultServlet.javaAuthor:*AdministratorDate:2008-9-4Description:ResultServlet*/publicclassResultServletextendsHttpServlet/*/privatestaticfinallongserialVersionUID=1L;* ifanerroroccurred* throwslOException* ifanerroroccurred* /publicvoiddoGet(HttpServletRequestrequest,HttpServletResponserespo

14、nse)throwsServletException,IOExceptiondoPost(request,response);/* ThedoPostmethodoftheservlet.* Thismethodiscalledwhenaformhasitstagvaluemethodequalsto*post.* paramrequesttherequestsendbytheclienttotheserver* paramresponsetheresponsesendbytheservertotheclient* throwsServletExceptionifanerroroccurred

15、* throwslOException* ifanerroroccurred* /publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,lOExceptionresponse.setContentType(text/html;charset=utf-8);StringvalidateC=(String)request.getSession().getAttribute(validateCode);StringveryCode=request.getParamet

16、er(veryCode);PrintWriterout=response.getWriter();if(veryCode=null|.equals(veryCode)out.println(驗證碼為空);elseif(validateC.equals(veryCode)out.println(驗證碼正確);elseout.println(驗證碼錯誤);)js 文件functionchangeImg()varimgSrc=$(#imgObj);varsrc=imgSrc.attr(src);imgSrc.attr(src,chgUrl(src);)/時間戳/為了使每次生成圖片不一致，即不讓瀏覽器

17、讀緩存，所以需要加上時間戳functionchgUrl(url)vartimestamp=(newDate().valueOf();url=url.substring(0,17);&)=0)?atamp=+timestamp;?timestamp=+timestamp;returnurl;functionisRightCode()varcode=$(#veryCode).attr(value);code=c=+code;$.ajax(type:POST,url:resultServlet,data:code,success:callback);functioncallback(data

18、)$(#info).html(data);頁面 verifyCode.jspout.flush();out.close();if(url.indexOf(url=url+elseurl=url+%pagelanguage=javapageEncodingPUBLIC-/W3C/DTDHTML4.01Transitional/EN/TR/html4/loose.dtdmetahttp-equiv=Content-Typecontent=text/html;charset=UTF-8scriptscripttestverifycodesrc=js/verifyCode.jssrc=js/jquery.js/script/titleinput/換一張input=isRightCode()/最后記得配好 web.xmlservlet-nameservlet-nameservlet-classservlet-mappingservlet-nameurl-patte