Jsp+Servlet+验证码

1、项目结构如下：图1packageimportimportimportimportimportimportimportimportimportimportpublic 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 Ran

2、dom();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.

3、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() sup

4、er();/* * Destruction of the servlet. */public void destroy() super.destroy(); / Just puts destroy string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException response.setHeader(pragma,No-cache);response.setHeader(C

5、ache-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(200,500);g.fillRect(1

6、, 1, width-1, height-1);g.setColor(new Color(102,102,102);g.drawRect(0, 0, width-1, height-1);g.setFont(mFont);/g.setColor(getRandColor(160,200);for(int i=0;i155;i+)int x=random.nextInt(width-1);int y=random.nextInt(height-1);int x1=random.nextInt(6)+1;int y1=random.nextInt(12)+1;g.drawLine(x, y, x+

7、x1, y+y1);/for(int i=0;i70;i+)int x=random.nextInt(width-1);int y=random.nextInt(height-1);int x1=random.nextInt(12)+1;int y1=random.nextInt(6)+1;g.drawLine(x, y, x-x1, y-y1);/String sRand =;for(int i=0;i4;i+)String tmp=getRandChar();sRand+=tmp;/g.setColor(new Color(20+random.nextInt(110),20+random.

8、nextInt(110),20+random.nextInt(110);g.drawString(String.valueOf(tmp), 15*i+16, 16);HttpSession session=request.getSession(true);session.setAttribute(ValidateCode, sRand);g.dispose();ImageIO.write(image, JPEG, response.getOutputStream();public void doPost(HttpServletRequest request, HttpServletRespon

9、se response)throws ServletException, IOException doGet(request,response);public void init() throws ServletException / Put your code herepublic class CheckLogin extends HttpServlet /* * Constructor of the object. */public CheckLogin() super();/* * Destruction of the servlet. */public void destroy() s

10、uper.destroy(); / Just puts destroy string in log/ Put your code herepublic void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException String validatecode1=(String)request.getSession().getAttribute(ValidateCode);/String validatecode2=request.getParameter

11、(validatecode);/if(!validatecode1.equals(validatecode2)/request.setAttribute(message, 验证错误);elserequest.setAttribute(message, 验证正确);/request.getRequestDispatcher(/login.jsp).forward(request, response);public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException doGet(request,response); public void init() throws ServletException / Put your code here配置文件： This is the description of my J2EE component This is the display name of my J2EE component AuthImage This is the description of my J2EE component T