图形验证码

xiaoxiao2025-04-17  17

package com.richerway.luxiportal.businessnews.controller; import com.richerway.luxiportal.businessnews.util.ImageCode; import org.springframework.stereotype.Controller; import org.springframework.util.StringUtils; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import javax.imageio.ImageIO; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.Date; import java.util.Map; /** * 图形验证码控制器 * * @author sunziwen * @version 1.0 * @date 2018-10-29 12:51 **/ @Controller public class ImageController { @RequestMapping(value = "/images/imagecode") public String imagecode(HttpServletRequest request, HttpServletResponse response) throws Exception { OutputStream os = response.getOutputStream(); Map<String,Object> map = ImageCode.getImageCode(60, 20, os); String simpleCaptcha = "simpleCaptcha"; request.getSession().setAttribute(simpleCaptcha, map.get("strEnsure").toString().toLowerCase()); request.getSession().setAttribute("codeTime",new Date().getTime()); try { ImageIO.write((BufferedImage) map.get("image"), "JPEG", os); } catch (IOException e) { return ""; } return null; } @RequestMapping(value = "/checkcode") @ResponseBody public String checkcode(HttpServletRequest request, HttpSession session) throws Exception { String checkCode = request.getParameter("checkCode"); Object simple = session.getAttribute("simpleCaptcha") ; //验证码对象 if(simple == null){ request.setAttribute("errorMsg", "验证码已失效,请重新输入!"); return "验证码已失效,请重新输入!"; } String captcha = simple.toString(); Date now = new Date(); Long codeTime = Long.valueOf(session.getAttribute("codeTime")+""); if(StringUtils.isEmpty(checkCode) || captcha == null || !(checkCode.equalsIgnoreCase(captcha))){ request.setAttribute("errorMsg", "验证码错误!"); return "验证码错误!"; }else if ((now.getTime()-codeTime) / 1000 / 60 > 5){//验证码有效长度为5分钟 request.setAttribute("errorMsg", "验证码已失效,请重新输入!"); return "验证码已失效,请重新输入!"; }else { session.removeAttribute("simpleCaptcha"); return "1"; } } } package com.richerway.luxiportal.businessnews.util; import java.awt.*; import java.awt.image.BufferedImage; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import java.util.Random; /** * 图形验证码工具类 */ public class ImageCode { private static char mapTable[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}; public static Map<String, Object> getImageCode(int width, int height, OutputStream os) { Map<String,Object> returnMap = new HashMap<String, Object>(); if (width <= 0) width = 60; if (height <= 0) height = 20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取图形上下文 Graphics g = image.getGraphics(); //生成随机类 Random random = new Random(); // 设定背景色 g.setColor(getRandColor(200, 250)); g.fillRect(0, 0, width, height); //设定字体 g.setFont(new Font("Times New Roman", Font.PLAIN, 18)); // 随机产生168条干扰线,使图象中的认证码不易被其它程序探测到 g.setColor(getRandColor(160, 200)); for (int i = 0; i < 168; i++) { int x = random.nextInt(width); int y = random.nextInt(height); int xl = random.nextInt(12); int yl = random.nextInt(12); g.drawLine(x, y, x + xl, y + yl); } //取随机产生的码 String strEnsure = ""; //4代表4位验证码,如果要生成更多位的认证码,则加大数值 for (int i = 0; i < 4; ++i) { strEnsure += mapTable[(int) (mapTable.length * Math.random())]; // 将认证码显示到图象中 g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110))); //直接生成 String str = strEnsure.substring(i, i + 1); g.drawString(str, 13 * i + 6, 16); } // 释放图形上下文 g.dispose(); returnMap.put("image",image); returnMap.put("strEnsure",strEnsure); return returnMap; } //给定范围获得随机颜色 static Color getRandColor(int fc, int bc) { 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); } }

 

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