验证码
public class OnLineImage {////验证码图片中可以出现的字符集，可根据需要修改//private char mapTable[]={//'a','b','c','d','e','h',//'A','B','C','D','E','F',//'j','k','m','n','p','q',//'J','K','M','N','P','Q',//'r','s','t','u','v','w',//'R','S','T','U','V','W',//'x','y','z','X','Y','Z',//'2','3','4','5','6','7',//'8','9'//};////public String getCertPic(int width, int height,OutputStream os) {//if(width<=0) {//width=60;//}//if(height<=0) {//height=20;//}////BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);////获取图形上下文//Graphics g = image.getGraphics();////设定背景颜色//g.setColor(new Color(0xDCDCDC));//g.fillRect(0, 0, width, height);////画边框//g.setColor(Color.black);//g.drawRect(0, 0, width-1, height-1);////随机产生的验证码//String strEnsure="";////4代表4位验证码，如果要生成等多位的验证码 ，则加大数值////for(int i=0; i<4; i++) {//strEnsure += mapTable[(int)(mapTable.length*Math.random())];//}////将验证码显示在图像中，如果要生成更多位的验证码，增加drawString语句//g.setColor(Color.black);//g.setFont(new Font("Atlantic Inline", Font.PLAIN,18));//String str = strEnsure.substring(0, 1);//g.drawString(str, 8, 17);// str = strEnsure.substring(1, 2);// g.drawString(str, 20, 15);// str = strEnsure.substring(2, 3);// g.drawString(str, 35, 18);// str = strEnsure.substring(3, 4);// g.drawString(str, 45, 15);// //随机产生10个干扰点// // Random random = new Random();// for(int i=0; i<10; i++ ) {// int x = random.nextInt(width);// int y = random.nextInt(height);// g.drawOval(x, y, 1, 1);// }////释放图形上下文// g.dispose(); Color getRandColor(int fc, int bc){//给定范围获得随机颜色 Random random = new Random(); if(fc>255) fc=255; if(bc>255) 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);}public String getCertPic(OutputStream os) {// 在内存中创建图象int width = 60, height = 20;BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);// 获取图形上下文Graphics g = image.getGraphics();//生成随机类Random random = new Random();// 设定背景色g.setColor(this.getRandColor(200,250));g.fillRect(0, 0, width, height);//设定字体g.setFont(new Font("Times New Roman",Font.PLAIN,18));//画边框//g.setColor(new Color());//g.drawRect(0,0,width-1,height-1);// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到g.setColor(getRandColor(160,200));for (int i=0;i<155;i++){int x = random.nextInt(width);int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x,y,x+xl,y+yl);}// 取随机产生的认证码(4位数字)String sRand="";for (int i=0;i<4;i++){String rand=String.valueOf(random.nextInt(10));sRand+=rand;// 将认证码显示到图象中g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//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.drawString(rand,13*i+6,16);}// 图象生效g.dispose(); try{ //输出图像到页面 ImageIO.write(image, "JPEG", os); }catch(IOException e) { return ""; }return sRand;}}action ：public class Image extends Action{public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {HttpSession session = request.getSession();session.removeAttribute("imagestr");OnLineImage image = new OnLineImage();String str = image.getCertPic(response.getOutputStream());session.setAttribute("sRand", str);return null;}}验证：public class ValidateCode extends Action{public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response)throws Exception {PrintWriter out = response.getWriter();HttpSession session = request.getSession();String code = (String) session.getAttribute("sRand");String code1 = request.getParameter("code");if(code.equals(code1)) {out.print("1");}else {out.print("0");}return null;}}jsp 显示验证码：<img id="code" border="0" src="/hereImage.do" alt="验证码" />更换验证码：function reloadCode(){$("code").src = path+"image.do?" + Math.random();}//----------------------------------------------------------------------------------------------public class SeccodeBuild extends HttpServlet {private static final long serialVersionUID = -205545450335033053L;private String randStrs = "ABCDEFGHIGKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";public void destroy() {super.destroy();}public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {getImage(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}public void init() throws ServletException {}@SuppressWarnings("unchecked")public void getImage(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {Map<String,String> settingMap = ForumInit.settings;String seccodedataString = settingMap.get("seccodedata");Map<String,Object> seccodedata = ((DataParse)BeanFactory.getBean("dataParse")).characterParse(seccodedataString, false);String widthString = String.valueOf(seccodedata.get("width"));//宽度String heightString = String.valueOf(seccodedata.get("height"));//高度int width = Integer.parseInt(widthString);int height =Integer.parseInt(heightString);int fontSize = width/4;//字体大小int wordPlace = (height/2+fontSize/3);//字符替换BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);//构造一个类型为预定义图像类型之一的 BufferedImageGraphics g = image.getGraphics();//可用于绘制此图像g.setColor(getRandColor(200, 250));//将此图形上下文的当前颜色设置为指定颜色g.fillRect(0, 0, width, height);//填充指定的矩形g.setFont(new Font("宋体", Font.PLAIN, fontSize));//将此图形上下文的字体设置为指定字体g.setColor(getRandColor(160, 200));for (int i = 0; i < 155; i++) {int x = Common.rand(width);int y = Common.rand(height);int xl = Common.rand(width);int yl = Common.rand(height);g.drawLine(x, y , xl, yl);//在此图形上下文的坐标系中，使用当前颜色在点 (x1, y1) 和 (x2, y2) 之间画一条线。}int randLen = 4;StringBuffer sRand = new StringBuffer(randLen);for (int i = 0; i < randLen; i++) {String rand = String.valueOf(randStrs.charAt(Common.rand(61)));sRand.append(rand);g.setColor(new Color(20 + Common.rand(110), 20 + Common.rand(110), 20 + Common.rand(110)));g.drawString(rand, fontSize * i + fontSize/4, wordPlace);//使用此图形上下文的当前字体和颜色绘制由指定 string 给定的文本}g.dispose();HttpSession session = request.getSession(true);session.setAttribute("rand", sRand.toString());ImageIO.write(image, "JPEG", response.getOutputStream());//使用支持给定格式的任意 ImageWriter 将一个图像写入 OutputStreamimage=null;}private Color getRandColor(int fc, int bc) {if (fc > 255)fc = 255;if (bc > 255)bc = 255;int r = fc + Common.rand(bc - fc);int g = fc + Common.rand(bc - fc);int b = fc + Common.rand(bc - fc);return new Color(r, g, b);}}
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