if（userList[i][0].equals（username））{
if（userList[i][1].equals（pwd））{
flag=true;
break;
}
}
}
if（flag）{
session.setAttribute（"username",username）;
response.sendRedirect（"main.jsp"）;
}else{
response.sendRedirect（"index.jsp"）;
}
%>
实验三javabean使用
打开指定大小的窗口
packagecom.lh.bean;
publicclassShowWindow{
privateStringurl;
privateStringopenWindowStr="";
privateintwidth;
privateintheight;
privateStringfunctionName;
publicStringgetUrl（）{
returnurl;
}
publicvoidsetUrl（Stringurl）{
this.url=url;
}
publicStringgetOpenWindowStr（）{
StringBuffersb=newStringBuffer（openWindowStr）;
sb.append（""）;
sb.append（"\r\n\t"）;
sb.append（"function"+this.functionName+"（）{"）;
sb.append（"\r\n\t\t"）;
sb.append（"varreturnObj=window.open（'"+this.url+"','window','width="+this.width+"px,height="+this.height+"px'）;"）;
sb.append（"\r\n\t\t"）;
sb.append（"varx=（screen.width-"+width+"）/2;"）;
sb.append（"\r\n\t\t"）;
sb.append（"vary=（screen.height-"+height+"）/2;"）;
sb.append（"\r\n\t\t"）;
sb.append（"returnObj.moveTo（x,y）;"）;
sb.append（"\r\n\t}"）;
sb.append（"\r\n"）;
sb.append（""）;
returnsb.toString（）;
}
publicvoidsetOpenWindowStr（StringopenWindowStr）{
this.openWindowStr=openWindowStr;
}
publicintgetWidth（）{
returnwidth;
}
publicvoidsetWidth（intwidth）{
this.width=width;
}
publicintgetHeight（）{
returnheight;
}
publicvoidsetHeight（intheight）{
this.height=height;
}
publicStringgetFunctionName（）{
returnfunctionName;
}
publicvoidsetFunctionName（StringfunctionName）{
this.functionName=functionName;
}
publicstaticvoidmain（String[]args）{
ShowWindows=newShowWindow（）;
s.setFunctionName（"openWindow"）;
s.setUrl（"index.jsp"）;
s.setWidth（500）;
s.setHeight（500）;
System.out.println（s.getOpenWindowStr（））;
}
}
实验4用servlet生成动态验证码
packagecom.lh.servlet;
importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.io.PrintWriter;
importjava.util.Random;
importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassValidateCodeServletextendsHttpServlet{
/**
*Constructoroftheobject.
*/
publicValidateCodeServlet（）{
super（）;
}
/**
*Destructionoftheservlet.
*/
publicvoiddestroy（）{
super.destroy（）;//Justputs"destroy"stringinlog
//Putyourcodehere
}
/**
*ThedoGetmethodoftheservlet.
*
*Thismethodiscalledwhenaformhasitstagvaluemethodequalstoget.
*
*@paramrequesttherequestsendbytheclienttotheserver
*@paramresponsetheresponsesendbytheservertotheclient
*@throwsServletExceptionifanerroroccurred
*@throwsIOExceptionifanerroroccurred
*/
publicvoiddoGet（HttpServletRequestrequest,HttpServletResponseresponse）
throwsServletException,IOException{
this.doPost（request,response）;
}
/**
*ThedoPostmethodoftheservlet.
*
*Thismethodiscalledwhenaformhasitstagvaluemethodequalstopost.
*
*@paramrequesttherequestsendbytheclienttotheserver
*@paramresponsetheresponsesendbytheservertotheclient
*@throwsServletExceptionifanerroroccurred
*@throwsIOExceptionifanerroroccurred
*/
publicColorgetRandomColor（intfc,intbc）{
Randomrandom=newRandom（）;
ColorrandomColor=null;
if（fc>255）fc=255;
if（bc>255）bc=255;
//设置个0-255之间的随机颜色值
intr=fc+random.nextInt（bc-fc）;
intg=fc+random.nextInt（bc-fc）;
intb=fc+random.nextInt（bc-fc）;
randomColor=newColor（r,g,b）;
returnrandomColor;
}
publicvoiddoPost（HttpServletRequestrequest,HttpServletResponseresponse）
throwsServletException,IOException{
response.setHeader（"Pragma","No-cache"）;
response.setHeader（"Cache-Control","No-cache"）;
response.setDateHeader（"Expires",0）;
response.setContentType（"image/jpeg"）;
intwidth=60,height=20;
BufferedImageimage=newBufferedImage（width,height,BufferedImage.TYPE_INT_RGB）;
Graphicsg=image.getGraphics（）;
Randomrandom=newRandom（）;
g.setColor（getRandomColor（200,250））;
g.fillRect（0,0,width,height）;
g.setFont（newFont（"TimesNewRoman",Font.PLAIN,18））;
g.setColor（getRandomColor（160,200））;
for（inti=0;i<130;i++）{
intx=random.nextInt（width）;
inty=random.nextInt（height）;
intxl=random.nextInt（12）;
intyl=random.nextInt（12）;
g.drawLine（x,y,x+xl,y+yl）;
}
StringstrCode="";
for（inti=0;i<4;i++）{
StringstrNumber=String.valueOf（random.nextInt（10））;
strCode=strCode+strNumber;
g.setColor（newColor（15+random.nextInt（120）,15+random.nextInt（120）,15+random.nextInt（120）））;
g.drawString（strNumber,13*i+6,16）;
}
request.getSession（）.setAttribute（"Code",strCode）;
g.dispose（）;
ImageIO.write（image,"JPEG",response.getOutputStream（））;
response.getOutputStream（）.flush（）;
response.getOutputStream（）.close（）;
}
/**
*Initializationoftheservlet.
*
*@throwsServletExceptionifanerroroccurs
*/
publicvoidinit（）throwsServletException{
//Putyourcodehere
}
}
实验5字符编码过滤器
packagecom.mr.encoding;
importjava.io.IOException;
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
publicclassEncodingFilterimplementsFilter{
privateStringEncoding;//在醒置web.xml编码
privatebooleanenabled;//是否启用Filter
publicvoidinit（FilterConfigconfig）throwsServletException{
Encoding=config.getInitParameter（"Encoding"）;//编码方式
enabled="true".equalsIgnoreCase（Encoding.trim（））//启用此FIlter
||"1".equalsIgnoreCase（Encoding.trim（））;
}
publicvoiddoFilter（ServletRequestrequest,ServletResponseresponse,
FilterChainchain）throwsIOException,ServletException{
if（enabled||Encoding!
=null）{//如果启用了此Filter
request.setCharacterEncoding（Encoding）;//request的编码
response.setCharacterEncoding（Encoding）;//response的编码
}
chain.doFilter（request,response）;//继续执行下一个Filter
}
publicvoiddestroy（）{
Encoding=null;
}
}
实验六
packagecom.lh.servlet;
importjava.io.IOException;
importjava.io.PrintWriter;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassLoginServletextendsHttpServlet{
/**
*Constructoroftheobject.
*/
publicLoginServlet（）{
super（）;
}
/**
*Destructionoftheservlet.
*/
publicvoiddestroy（）{
super.destroy（）;//Justputs"destroy"stringinlog
//Putyourcodehere
}
/**
*ThedoGetmethodoftheservlet.
*
*Thismethodiscalledwhenaformhasitstagvaluemethodequalstoget.
*
*@paramrequesttherequestsendbytheclienttotheserver
*@paramresponsetheresponsesendbytheservertotheclient
*@throwsServletExceptionifanerroroccurred
*@throwsIOExceptionifanerroroccurred
*/
publicvoiddoGet（HttpServletRequestrequest,HttpServletResponseresponse）
throwsServletException,IOException{
this.doPost（request,response）;
}
/**
*ThedoPostmethodoftheservlet.
*
*Thismethodiscalledwhenaformhasitstagvaluemethodequalstopost.
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