Generate two-dimensional code interfaces, front-end interface to call the two-dimensional code displayed on the page

The main numbers and letters are generated two-dimensional code 4

We will generate two-dimensional code put to the cache, there is an expiration time. When the two-dimensional code verification need to get the value of the two-dimensional code based on key values, as if the page code and pass over the cache, then the code is entered correctly.

@RequestMapping(value = "/getImgCode")
public void getImgCode(HttpServletRequest request, HttpServletResponse response, @RequestParam(defaultValue = "") String telephone) throws Exception {

    // 设置响应的类型格式为图片格式
    response.setContentType("image/jpeg");
    //禁止图像缓存。  
    response.setHeader("Pragma", "no-cache");
    response.setHeader("Cache-Control", "no-cache");
    response.setDateHeader("Expires", 0);
    HttpSession session = request.getSession();

    ValidateCode vCode = new ValidateCode(140, 50, 4, 0);
    String key = String.format(KConstants.Key.IMGCODE, telephone.trim());
    SKBeanUtils.getRedisCRUD().set(key, vCode.getCode());
    SKBeanUtils.getRedisCRUD () expire (key 300).;

    session.setAttribute("code", vCode.getCode());
    // session.setMaxInactiveInterval(10*60);
    System.out.println("getImgCode telephone ===>" + telephone + " code " + vCode.getCode());
    vCode.write(response.getOutputStream());
}

/ ** 
*   
* @param wide image width 
* @param high image height 
* @param codeCount number of characters 
* @param interference lineCount number of lines 
* /   
public ValidateCode (int width, int height, int codeCount, int lineCount) {   
    the this. width = width;   
    this.height = height;   
    this.codeCount = codeCount;   
    this.lineCount = lineCount;   
    this.createCode ();   
}   
  
public void the createCode () {   
    int X = 0, FontHeight = 0, = 0, codeY;   
    int Red 0 =, = 0 Green, Blue = 0;   
      
    X = width / (codeCount); // for each character width   
    fontHeight = height -4; // height of the font   
    , codeY = height -. 8;   
      
    // image buffer  
    buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);  
    Graphics2D g = buffImg.createGraphics();  
    // 生成随机数  
    Random random = new Random();  
    // 将图像填充为白色  
    g.setColor(Color.WHITE);  
    g.fillRect(0, 0, width, height);  
    // 创建字体  
    ImgFontByte imgFont = new ImgFontByte();  
    Font font =imgFont.getFont(fontHeight);  
    g.setFont(font);  
      
    for (int i = 0; i < lineCount; i++) {  
        int xs = random.nextInt(width);  
        int ys = random.nextInt(height);  
        int xe = xs+random.nextInt(width/8);  
        int ye = ys+random.nextInt(height/8);  
        red = random.nextInt(255);  
        = random.nextInt Green (255);   
        Blue = random.nextInt (255);   
        g.setColor (new new Color (Red, Green, Blue));   
        g.drawLine (XS, YS, XE, YE);   
    }   
      
    // randomCode recording the generated random codes   
    the StringBuffer randomCode the StringBuffer new new = ();   
    // codeCount randomly generated character codes.  
    for (int I = 0; I <codeCount; I ++) {   
        String strRand = String.valueOf (codeSequence [random.nextInt (codeSequence.length)]);   
        // generate random color value, so that each character of the output color values are different.  
        0 = Red;   
        Green = 0;   
        Blue = 0;   
        g.setColor (new new Color (Red, Green, Blue));   
        g.drawString (strRand, (I) * X,, codeY);   
        // four randomly generated the number of combinations together.  
        randomCode.append (strRand);   
    }   
    // save the four-digit codes to the Session.  
    = randomCode.toString code ();        
}    

Page: so would give a two-dimensional code generation.

var url = "/getImgCode?telephone=" + account+"&timestamp=" + new Date().getTime();

$("#getImgCode").show();

$("#getImgCode").attr("src", url);