java生成验证码

片段 1片段 2

ImageCode

package com.play.veritycode.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;

/**
* 验证码图片生成
* @Author  Bob Simon
* @Date 2018-01-05 15:34
**/
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);
      }      public static  void main(String args[]){

         long l1 =  System.currentTimeMillis();
         System.out.println("打印这句话！！");

         System.out.println( System.currentTimeMillis() - l1);

      }
}

GetVerifyCode

package com.play.veritycode.controller;

import com.play.veritycode.util.ImageCode;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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;

/**
* 获取验证码控制层
* @Author  Bob Simon
* @Date 2018-01-05 15:35
**/
@RestController
public class GetVerifyCode {

      @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",System.currentTimeMillis());
         try {
            ImageIO.write((BufferedImage) map.get("image"), "JPEG", os);
         } catch (IOException e) {
            return "";
         }
         return null;
      }   @RequestMapping(value = "/checkcode")
   public String checkcode(HttpServletRequest request, HttpSession session) throws Exception {
      String checkCode = request.getParameter("checkCode");
      Object cko = session.getAttribute("simpleCaptcha") ; //验证码对象
      if(cko == 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 = cko.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) {   //60秒
         //验证码有效时长为60秒钟
         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";
      }
   }}

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