生成图片验证码实例

1、Util包中,公共的方法：packageimportimportimportimportimportimportimportimportimportpublic class CreateValidateImage / 放到session中的key,这个值不是固定的,可以自己随便写public static final String RANDOMCODEKEY = RANDOMVALIDATECODEKEY;private Random random = new Random(;/ 随机产生的字符串private String randString = 0123456789ABCDEFGHIJK

2、LMNOPQRSTUVWXYZ;private int width = 80;/ 图片宽private int height = 26;/ 图片高private int lineSize = 40;/ 干扰线数量private int stringNum = 4;/ 随机产生字符数量/* 获得字体*/private Font getFont( return new Font(Fixedsys, Font.CENTER_BASELINE, 18;/* 获得颜色*/private Color getRandColor(int fc, int bc if (fc 255fc = 255;if (bc

3、 255bc = 255;int r = fc + random.nextInt(bc - fc - 16;int g = fc + random.nextInt(bc - fc - 14;int b = fc + random.nextInt(bc - fc - 18;return new Color(r, g, b;/* 生成随机图片*/public void getRandcode(HttpServletRequest request,HttpServletResponse response HttpSession session = request.getSession(;/ Buff

4、eredImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR;/ 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作Graphics g = image.getGraphics(;g.fillRect(0, 0, width, height;g.setFont(new Font(Times New Roman, Font.ROMAN_BASELINE, 18;g.setColor(get

5、RandColor(110, 133;/ 绘制干扰线for (int i = 0; i = lineSize; i+ drowLine(g;/ 绘制随机字符String randomString = ;for (int i = 1; i = stringNum; i+ randomString = drowString(g, randomString, i;session.removeAttribute(RANDOMCODEKEY;session.setAttribute(RANDOMCODEKEY, randomString;System.out.println(randomString;g

6、.dispose(;try / 将内存中的图片通过流动形式输出到客户端ImageIO.write(image, JPEG, response.getOutputStream(; catch (Exception e e.printStackTrace(;/* 绘制字符串*/private String drowString(Graphics g, String randomString, int i g.setFont(getFont(;g.setColor(new Color(random.nextInt(101, random.nextInt(111, random.nextInt(121

7、;String rand = String.valueOf(getRandomString(random.nextInt(randString.length(;randomString += rand;g.translate(random.nextInt(3, random.nextInt(3;g.drawString(rand, 13 * i, 16;return randomString;/* 绘制干扰线*/private void drowLine(Graphics g int x = random.nextInt(width;int y = random.nextInt(height;

8、int xl = random.nextInt(13;int yl = random.nextInt(15;g.drawLine(x, y, x + xl, y + yl;/* 获取随机的字符*/public String getRandomString(int num return String.valueOf(randString.charAt(num;Action中直接调用Util包中的方法:public String getImg(HttpServletRequest request = ServletActionContext.getRequest(;HttpServletRespo

9、nse response = ServletActionContext.getResponse(;/设置相应类型,告诉浏览器输出的内容为图片response.setContentType(image/jpeg; /设置响应头信息，告诉浏览器不要缓存此内容response.setHeader(Pragma, No-cache; response.setHeader(Cache-Control, no-cache;response.setDateHeader(Expire, 0;RandomValidateCode randomValidateCode = new RandomValidateCo

10、de(;try randomValidateCode.getRandcode(request, response;/输出图片方法 catch (Exception e e.printStackTrace(;return null;Html或jsp页面:输入验证码 labelformJs:/刷新验证图片,function refresh(url /temp=+(new Date(.getTime(.toString(36/连接加上这个表示清楚缓存，$(#imgValidate.attr(src,url;验证输入验证码是否正确:public String validateImg( throws I

11、OExceptionHttpServletRequest request = ServletActionContext.getRequest(;HttpServletResponse response = ServletActionContext.getResponse(;response.setCharacterEncoding(UTF-8;request.setCharacterEncoding(UTF-8;/在创建图片时,session的Attribute的值是由自己所设置， String resultStr = (String request.getSession(.getAttribute(RANDOMVALIDATECODEKEY;/设置不区分大小写,同意转换成大写.this.setValidateStr(validateStr.toUpperCase(;if(resultStr.equals(v