java代码生成验证码(servlet).docx

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HYPERLINK"http://wolfandlili.javaeye.com/blog/684920"java验证码代码(转)
产生图片servlet

importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics2D;
importjava.awt.image.BufferedImage;
importjava.util.Random;

importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.ServletOutputStream;
importjavax.servlet.http.HttpServlet;
importjavax.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{

/**
*
*/
privatestaticfinallongserialVersionUID=1L;

/**
*验证码图片的宽度。
*/
privateintwidth=60;

/**
*验证码图片的高度。
*/
privateintheight=20;

/**
*验证码字符个数
*/
privateintcodeCount=4;

/**
*xx
*/
privateintxx=0;

/**
*字体高度
*/
privateintfontHeight;

/**
*codeY
*/
privateintcodeY;

/**
*codeSequence
*/
char[]codeSequence={'A','B','C','D','E','F','G','H','I','J',
'K','L','M','N','O','P','Q','R','S','T','U','V','W',
'X','Y','Z','0','1','2','3','4','5','6','7','8','9'};

/**
*初始化验证图片属性
*/
publicvoidinit()throwsServletException{
//从web.xml中获取初始信息
//宽度
StringstrWidth=this.getInitParameter("width");
//高度
StringstrHeight=this.getInitParameter("height");
//字符个数
StringstrCodeCount=this.getInitParameter("codeCount");

//将配置的信息转换成数值
try{
if(strWidth!=null&&strWidth.length()!=0){
width=Integer.parseInt(strWidth);
}
if(strHeight!=null&&strHeight.length()!=0){
height=Integer.parseInt(strHeight);
}
if(strCodeCount!=null&&strCodeCount.length()!=0){
codeCount=Integer.parseInt(strCodeCount);
}
}catch(NumberFormatExceptione){
e.printStackTrace();
}

xx=width/(codeCount+1);
fontHeight=height-2;
codeY=height-4;

}

/**
*@paramreq
*@paramresp
*@throwsServletException
*@throwsjava.io.IOException
*/
protectedvoidser