Java生成验证码

/** * 接收验证码请求 */@RequestMapping(value="captchacode")public void CaptchaCode(){  try {    CaptchaCodeModel captchaCodeModel=new CaptchaCode().getCode();    //将验证码放到Session中    HttpServletRequest httpServletRequest=super.getRequest();    httpServletRequest.getSession().setAttribute("captchacodekey", captchaCodeModel.getCaptchaCode());    //将图片写到客户端     HttpServletResponse httpServletResponse=super.getResponse();    //禁止缓存    httpServletResponse.setHeader("Pragma", "no-cache");    httpServletResponse.setHeader("Cache-Control", "no-cache");    httpServletResponse.setDateHeader("Expires", 0);    ServletOutputStream servletOutputStream=httpServletResponse.getOutputStream();    //输出图片    ImageIO.write(captchaCodeModel.getCaptchaImage(), "jpeg", servletOutputStream);    servletOutputStream.close();  } catch (Exception e) {    logger.info("验证码生成失败:"+e.getMessage());  }}

public class CaptchaCode {private int width = 90;// 定义图片的widthprivate int height = 20;// 定义图片的heightprivate int codeCount = 4;// 定义图片上显示验证码的个数private int xx = 15;private int fontHeight = 18;private int codeY = 16;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' };

public CaptchaCodeModel getCode() throws IOException {  // 定义图像buffer  BufferedImage buffImg = new BufferedImage(width, height,      BufferedImage.TYPE_INT_RGB);  Graphics gd = buffImg.getGraphics();  // 创建一个随机数生成器类  Random random = new Random();  // 将图像填充为白色  gd.setColor(Color.WHITE);  gd.fillRect(0, 0, width, height);  // 创建字体，字体的大小应该根据图片的高度来定。  Font font = new Font("Fixedsys", Font.BOLD, fontHeight);  // 设置字体。  gd.setFont(font);  // 画边框。  gd.setColor(Color.BLACK);  gd.drawRect(0, 0, width - 1, height - 1);  // 随机产生40条干扰线，使图象中的认证码不易被其它程序探测到。  gd.setColor(Color.BLACK);  for (int i = 0; i < 40; i++) {    int x = random.nextInt(width);    int y = random.nextInt(height);    int xl = random.nextInt(12);    int yl = random.nextInt(12);    gd.drawLine(x, y, x + xl, y + yl);  }  // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。  StringBuffer randomCode = new StringBuffer();  int red = 0, green = 0, blue = 0;  // 随机产生codeCount数字的验证码。  for (int i = 0; i < codeCount; i++) {    // 得到随机产生的验证码数字。    String code = String.valueOf(codeSequence[random.nextInt(36)]);    // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。    red = random.nextInt(255);    green = random.nextInt(255);    blue = random.nextInt(255);    // 用随机产生的颜色将验证码绘制到图像中。    gd.setColor(new Color(red, green, blue));    gd.drawString(code, (i + 1) * xx, codeY);    // 将产生的四个随机数组合在一起。    randomCode.append(code);  }  CaptchaCodeModel captchaCodeModel=new CaptchaCodeModel();  captchaCodeModel.setCaptchaCode(randomCode.toString());  captchaCodeModel.setCaptchaImage(buffImg);  return captchaCodeModel;}public class CaptchaCodeModel{  //验证码的String形式  private String captchaCode;  //验证码的图片形式  private BufferedImage captchaImage;  public String getCaptchaCode() {    return captchaCode;  }  public void setCaptchaCode(String captchaCode) {    this.captchaCode = captchaCode;  }  public BufferedImage getCaptchaImage() {    return captchaImage;  }  public void setCaptchaImage(BufferedImage captchaImage) {    this.captchaImage = captchaImage;  }}

/*** 验证验证码*/@RequestMapping(value = "valicatpcha")public void register_R() {PageData pageData = super.getPageData();  // 获取验证码  String captchaCode = pageData.getString("captchacode");  HttpServletRequest httpServletRequest = super.getRequest();  Object codeObject = httpServletRequest.getSession().getAttribute(“captchacodekey”);  // 验证码错误  if (codeObject == null      || Tools.isEmptyString(captchaCode)      || !String.valueOf(codeObject).toUpperCase()          .equals(captchaCode.toUpperCase())) {    setResult(        MessageManager.getInstance().getMessage("invalidcaptcha"),        ResultType.Error);    return;  }}

function validcaptchacode(captchaCode) {$.ajax({type : "POST",url : "valicatpcha",data : {captchacode : captchaCode,tm : new Date().getTime()},dataType : "json",cache : false,success : function(data) {alert(data);},error : function(data) {alert(data); }});}