图片验证码获取及验证

图片验证码获取及验证

流程图

服务层

接口 代码片.

public BufferedImage getImage(HttpSession httpSession);

实现类 代码片.

@Override
 public BufferedImage getImage(HttpSession httpSession) {
  BufferedImage bufferedImage = new BufferedImage(W, H, BufferedImage.TYPE_INT_BGR);
  Graphics graphics = bufferedImage.getGraphics();
  graphics.setColor(Color.white);
  graphics.fillRect(0, 0, W, H);
  StringBuffer StringBuffer = new StringBuffer();
  Font font = new Font("微软雅黑", Font.BOLD, 24);
  //随机验证码字符
  for(int i=0;i<4;i++) {
   String zm=getZM();
   StringBuffer.append(zm);
   graphics.setFont(font);
   graphics.setColor(randomColor());
   graphics.drawString(zm,(1+i)*(W/6),H*3/4);
  }
  String code = StringBuffer.toString();
  httpSession.setAttribute("code", code);//将code验证码存入session
  huaXian(graphics);
  return bufferedImage;
 }
 //添加干扰线
  public void huaXian(Graphics graphics) {
   Random random = new Random();
   for(int i=0;i<5;i++) {
    graphics.setColor(randomColor());
    int x1 = random.nextInt(20);
    int y1 = random.nextInt(H);
    int x2=(W-20)+random.nextInt(20);
    int y2=random.nextInt(H);
    graphics.drawLine(x1, y1, x2, y2);
   }
  }
 public Color randomColor() {
  Random random = new Random();
  int R = random.nextInt(256);
  int G = random.nextInt(256);
  int B = random.nextInt(256);
  Color color = new Color(R,G,B);
  return color;
 }
 
 public String getZM() {
  Random random = new Random();
  //获取26个小写字母
  String str = String.valueOf((char)(97+random.nextInt(26)));
  //数字
  int str1 = random.nextInt(10);
  if(random.nextInt(2)==1) {
   if(random.nextInt(2)==1) {
    return str;
   }else {
    return str.toUpperCase();
   }
  }else {
   return str1 + "";
  }
 }

控制层

代码片.

@RequestMapping("getcode")
 public void getcode(HttpServletResponse httpServletResponse,HttpSession httpSession) {
  BufferedImage image=hwservice.getImage(httpSession);
  try {
   ServletOutputStream outputStream = httpServletResponse.getOutputStream();
   ImageIO.write(image, "png", outputStream);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 @RequestMapping("checkCode/{code}")
 @ResponseBody
 public String checkCode(@PathVariable("code")String code,HttpSession httpSession) {
   //取出session中的code验证码
  String checkCode = httpSession.getAttribute("code").toString();
  if(checkCode!=null) {
   if(checkCode.equals(code)) {
    return"OK";
   }
  }
  return"NO";
 }

客户端

代码片.

//根据自身环境需求设置大小样式
<div class="form_text_ipt" style="position: relative;">
<input name="name" type="text" placeholder="验证码" id="codeid" />
<img src="authCode" id="codeImg" onclick="chageCode()" style="width: 90px; height: 30px; position: absolute; top: 3px; right: 5px;" />
</div>

//点击图片验证码进行切换
function changeCode() {
			$("#codeImg").attr('src', 'authCode?abc=' + Math.random());
		}

//获取验证码输入框的值
var code-id = $("#codeid").val();
//发送请求将输入的验证码与后端生成的进行比较
$.get("checkCode/"+captcha,function(result){
                console.log(result);
});

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