JspServlet+验证码.docVIP

项目结构如下： 图1 package com.checkcode.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.util.Random; import java.awt.*; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import javax.servlet.http.HttpSession; public class AuthImage extends HttpServlet { private static final String CONTENT_TYPE=text/html;charset=gb2312; private Font mFont=new Font(Times new Roman,Font.PLAIN,17); // Color getRandColor(int fc,int bc) { Random random=new Random(); if(fc255) fc=255; if(bc255) bc=255; int r=fc+random.nextInt(bc-fc); int g=fc+random.nextInt(bc-fc); int b=fc+random.nextInt(bc-fc); return new Color(r,g,b); } // private String getRandChar(){ int rand=(int)Math.round(Math.random()*2); long itmp=0; char ctmp=\u0000; switch(rand){ case 1: itmp=Math.round(Math.random()*25+65); ctmp=(char)itmp; return String.valueOf(ctmp); case 2: itmp=Math.round(Math.random()*25+97); ctmp=(char)itmp; return String.valueOf(ctmp); default: itmp=Math.round(Math.random()*9); ctmp=(char)itmp; return String.valueOf(ctmp); } } // /** * Constructor of the object. */ public AuthImage() { super(); } /** * Destruction of the servlet. br */ public void destroy() { super.destroy(); // Just puts destroy string in log // Put your code here } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setHeader(pragma,No-cache); response.setHeader(Cache-Control, No-cashe); response.setHeader(Expires,0); // response.setContentType(image/jpeg); int width=80; int height=18; BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics g=image.getGraphics(); Random random=new Random(); g.setColor(getRandColor(200,50