SSH框架中验证码的集成
1.web.xml
<!--验证码集成-->
<servlet>
<servlet-name>ValidateCodeServlet</servlet-name>
<servlet-class>
com.xjtu.util.ValidateCodeServlet
</servlet-class>
<init-param>
<param-name>width</param-name>
<param-value>200</param-value>
</init-param>
<init-param>
<param-name>height</param-name>
<param-value>80</param-value>
</init-param>
<init-param>
<param-name>codeCount</param-name>
<param-value>5</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>ValidateCodeServlet</servlet-name>
<url-pattern>/validateCode.img</url-pattern>
</servlet-mapping>
<!--验证码集成-->
2.com.xjtu.util
packagecom.xjtu.util;
importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics2D;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.util.Random;
importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassValidateCodeServletextendsHttpServlet{
privatefinalFontmFont=newFont("ArialBlack",Font.PLAIN,15);//设置字体
privatefinalintlineWidth=2;//干扰线的长度=1.414*lineWidth
privatefinalintwidth=60;//定义图形大小
privatefinalintheight=22;//定义图形大小
privatefinalintcount=200;
/**
*描述：
*
*@paramfc
*描述：
*@parambc
*描述：
*
*@return描述：
*/
privateColorgetRandColor(intfc,intbc){//取得给定范围随机颜色
finalRandomrandom=newRandom();
if(fc>255){
fc=255;
}
if(bc>255){
bc=255;
}
finalintr=fc+random.nextInt(bc-fc);
finalintg=fc+random.nextInt(bc-fc);
finalintb=fc+random.nextInt(bc-fc);
returnnewColor(r,g,b);
}
//处理post
@Override
publicvoiddoPost(finalHttpServletRequestrequest,finalHttpServletResponseresponse)
throwsServletException,IOException{
doGet(request,response);
}
/**
*描述：
*
*@paramrequest
*描述：
*@paramresponse
*描述：
*
*@throwsServletException
*描述：
*@throwsIOException
*描述：
*/
@Override
publicvoiddoGet(finalHttpServletRequestrequest,finalHttpServletResponseresponse)
throwsServletException,IOException{
//response.reset();
//设置页面不缓存
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires",0);
response.setContentType("image/gif");
//在内存中创建图象
finalBufferedImageimage=newBufferedImage(width,height,
BufferedImage.TYPE_INT_RGB);
//获取图形上下文
finalGraphics2Dg=(Graphics2D)image.getGraphics();
//生成随机类
finalRandomrandom=newRandom();
//设定背景色
g.setColor(getRandColor(200,250));//---1
g.fillRect(0,0,width,height);
//设定字体
g.setFont(mFont);
//画边框
g.setColor(getRandColor(0,20));//---2
g.drawRect(0,0,width-1,height-1);
//随机产生干扰线，使图象中的认证码不易被其它程序探测到
for(inti=0;i<count;i++){
g.setColor(getRandColor(150,200));//---3
finalintx=random.nextInt(width-lineWidth-1)+1;//保证画在边框之内
finalinty=random.nextInt(height-lineWidth-1)+1;
finalintxl=random.nextInt(lineWidth);
finalintyl=random.nextInt(lineWidth);
g.drawLine(x,y,x+xl,y+yl);
}
//取随机产生的认证码(4位数字)
StringsRand="";
for(inti=0;i<4;i++){
finalStringrand=String.valueOf(random.nextInt(10));
sRand+=rand;
//将认证码显示到图象中,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.setColor(newColor(20+random.nextInt(130),20+random
.nextInt(130),20+random.nextInt(130)));//--4--50-100
g.drawString(rand,(13*i)+6,16);
}
//将认证码存入SESSION
request.getSession().setAttribute("validateCode",sRand);
//图象生效
g.dispose();
finaljava.io.OutputStreamos=response.getOutputStream();
//输出图象到页面
ImageIO.write(image,"PNG",os);
os.flush();
os.close();
}
}
3.jsp
<inputtype="validate"name="validateCode"id="code"
style="height:18px;width:130px;border:solid1px#cadcb2;font-size:12px;color:#81b432;">
<imgheight='17'width="55"src="${ctx}/validateCode.img"
onclick="this.src='${ctx}/validateCode.img?'+Math.random();"
style="cursor:pointer;vertical-align:middle;"/>
4.form
/*
*GeneratedbyMyEclipseStruts
*Templatepath:templates/java/JavaClass.vtl
*/
packagecom.xjtu.action.form;
importjavax.servlet.http.HttpServletRequest;
importorg.apache.struts.action.ActionErrors;
importorg.apache.struts.action.ActionForm;
importorg.apache.struts.action.ActionMapping;
/**
*MyEclipseStruts
*Creationdate:04-02-2011
*
*XDocletdefinition:
*@struts.formname="loginForm"
*/
publicclassLoginFormextendsActionForm{
/*
*Generatedfields
*/
/**passwordproperty*/
privateStringpassword;
/**usernameproperty*/
privateStringusername;
privateStringvalidateCode;
/*
*GeneratedMethods
*/
/**
*Methodvalidate
*@parammapping
*@paramrequest
*@returnActionErrors
*/
publicActionErrorsvalidate(ActionMappingmapping,
HttpServletRequestrequest){
//TODOAuto-generatedmethodstub
returnnull;
}
/**
*Methodreset
*@parammapping
*@paramrequest
*/
publicvoidreset(ActionMappingmapping,HttpServletRequestrequest){
//TODOAuto-generatedmethodstub
}
/**
*Returnsthepassword.
*@returnString
*/
publicStringgetPassword(){
returnpassword;
}
/**
*Setthepassword.
*@parampasswordThepasswordtoset
*/
publicvoidsetPassword(Stringpassword){
this.password=password;
}
/**
*Returnstheusername.
*@returnString
*/
publicStringgetUsername(){
returnusername;
}
/**
*Settheusername.
*@paramusernameTheusernametoset
*/
publicvoidsetUsername(Stringusername){
this.username=username;
}
publicStringgetValidateCode(){
returnvalidateCode;
}
publicvoidsetValidateCode(StringvalidateCode){
this.validateCode=validateCode;
}
}
5.action
StringvalidateCode=loginForm.getValidateCode();
StringvalidateCodesession=(String)session.getAttribute("validateCode");
if(userinfo.getPwd().equals(password)&&validateCodesession.equals(validateCode))