登錄圖片驗證碼--前端校驗
阿新 • • 發佈：2018-05-04
文字 win rgb rgba imu auto lock 得到 stroke
<!DOCTYPE html>
<html>
<!-- head -->
<head>
<meta charset="utf-8">
<title>圖片登錄驗證</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<style>
body{margin: 10px;}
.demo
也可以實用後端驗證方式
https://blog.csdn.net/datuo/article/details/1393227
https://blog.csdn.net/rchm8519/article/details/45081225
package com.hikvision.cms.module.cpi.servlet; import java.awt.Color; import java.awt.Container; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.util.Random; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JLabel; public class ImageTool { public String sRand = ""; public Color getRandColor(int fc, int bc) {//給定範圍獲得隨機顏色 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 BufferedImage creatImage() {//在內存中創建圖像 int width = 60; int height = 20; BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); //獲取圖形上下文 Graphics g = image.getGraphics(); //生成隨機類 Random random = new Random(); //設定背景色 g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height); //設定字體 g.setFont(new Font("Times New Roman",Font.PLAIN,18)); //畫邊框 // g.setColor(new Color()); // g.drawRect(0, 0, width-1, height-1); //隨機產生155條幹擾經，使圖像中的認證碼不易被其他程序探測到 for(int i=0; i<155; i++) { g.setColor(getRandColor(160,200)); int x = random.nextInt(width); int y = random.nextInt(height); int x1 = random.nextInt(12); int y1 = random.nextInt(12); g.drawLine(x, y, x+x1, y+y1); } //取隨機產生 的認證碼（4位數字） sRand = ""; for(int i=0; i<4; i++) { String rand = String .valueOf(random.nextInt(10)); sRand+=rand; //將認證碼顯示到圖像中 g.setColor(new Color(20+random.nextInt(110), 20 + random.nextInt(110), 20+random.nextInt(110))); //調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成 g.drawString(rand, 13*i+6, 16); } //圖像生效 g.dispose(); return image; } public String getRand() { return sRand; } public static void main(String[] args) { ImageTool it = new ImageTool(); JFrame jf = new JFrame(); jf.setSize(200,300); jf.setTitle("產生驗證碼"); Container ct = jf.getContentPane(); ImageIcon ii = new ImageIcon(it.creatImage()); JLabel jl = new JLabel(ii); ct.add(jl); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setVisible(true); System.out.println(it.getRand()); } }
登錄圖片驗證碼--前端校驗