java实现点选汉字验证码（自己修改后的）

参考：http://blog.csdn.net/qq_26680031/article/details/51168527

package com.rd.p2p.web;
 
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
 
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
 
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.formula.functions.T;
import org.apache.struts2.convention.annotation.Action;
 
import com.alibaba.fastjson.JSON;
import com.rd.p2p.additional.redisCaptcha.util.ResponseUtil;
import com.rd.p2p.common.util.redis.RedisValidImgCodeUtils;
import com.rd.p2p.core.core.Global;
import com.rd.p2p.core.core.constant.Constant;
import com.rd.p2p.core.core.web.BaseAction; 
 
public class CodeAction extends BaseAction<T> {
 
      private static final String KEY = "randomCode";
      //点选文字图片验证码刷新次数
      private static final String KEY_TOTAL = "select_random_code_total";
      //点选文字图片验证码验证通过次数
      private static final String KEY_SUCC = "select_random_code_succ";
      //点选文字图片验证码验证失败次数
      private static final String KEY_FAIL = "select_random_code_fail";
      //缓存时间单位秒 设置成7天
      private static final int CACHE_SECONDS = 604800;
      //定义点选文字图片验证码允许的误差值
      private static final int ERROR_AMOUNT = 12;// 定义允许的误差值，单位是px
      //生成汉字的个数
      private static Integer[] arr = new Integer[] {1, 2, 3, 4, 5};
      //汉字颜色随机范围
      private static Color[] colors = {Color.GRAY, Color.LIGHT_GRAY, Color.CYAN};
 
    /**
     * 跳转页面
     * @return
     */
    @Action("/verification")
    public String verification() {
        request.setAttribute("web_url", Global.getString("web_url"));
        return "verification";
    }
 
    /**生成验证码
     * @param src
     * @param x
     * @param y
     */
    @Action("/code/getVerificationCode")
    public void readUsingImageReaderBigcH() {
        ServletOutputStream outStream = null;
        try {
        // http://localhost:8080/gtop/img/149679.jpg
        //String url = "d:/4.png";
        //url = request.getSession().getServletContext().getRealPath("") + url;
       /* InputStream source = new FileInputStream(src);
        BufferedImage image = null;
        image = ImageIO.read(source);*/
 
        //生成背景图片
        BufferedImage image = getBackGround();
        int hight = image.getHeight();
        Graphics graphics = image.getGraphics();
        // 设置颜色
        graphics.setColor(Color.red);
        graphics.setFont(new Font("宋体", Font.BOLD, 30));
 
        StringBuilder sb = new StringBuilder();
        Random random = new Random();
 
        //转成集合
        List<Integer> intList = Arrays.asList(arr);
        //重新随机排序
        Collections.shuffle(intList);
 
        //list参数坐标参数 用于校验是否验证通过
        List<String> codeList = new ArrayList<String>();
 
        int x = 0;
        int y = 0;
 
        //定义随机1到arr.length某一个字不参与校验
        int num = random.nextInt(arr.length)+1;
 
        for (int i = 0; i < arr.length; i++) { // 5个汉字,只点4个
            String ch = getRandomChineseChar();
 
            int place = intList.get(i);
            if (place == 1) {
                x = new Random().nextInt(30) + 40; // 自己定义的位子坐标
                y = new Random().nextInt(30) + 40; // i=1的时候，y的值
            }
            if (place == 2) {
                x = new Random().nextInt(40) + 120; // 自己定义的位子坐标
                y = new Random().nextInt(30) + 50; // i=2的时候，y的值
            }
            if (place == 3) {
                x = new Random().nextInt(70) + 200; // 自己定义的位子坐标
                y = new Random().nextInt(50) + 100; // i=3的时候，y的值
            }
            if (place == 4) {
                x = new Random().nextInt(70) + 80; // i=4的时候，x的值
                y = new Random().nextInt(30) + 90; // 自己定义的位子坐标
            }
            if (place == 5) {
                x = new Random().nextInt(70) + 180; // i=4的时候，x的值
                y = new Random().nextInt(30) + 50; // 自己定义的位子坐标
            }
 
            Constant.LOGGER.info("x:" + x + ",y:" + y + "，hight:" + hight);
            //字体颜色
            graphics.setColor(colors[random.nextInt(colors.length)]);
            graphics.drawString(ch, x, y);
            if (place != num) {
                sb.append(ch);
                codeList.add(x + "_" + y); // jsp页面坐标原点在字的中间，drawString方法坐标原点在中间
            }
        }
 
        Constant.LOGGER.info("汉字：" + sb);
        //放入session
        //将产生的随机汉字验证码存进session中进行保存
        String sessionid = request.getSession().getId();
        RedisValidImgCodeUtils.save(sessionid + KEY, codeList);
        //增加验证码请求次数
        RedisValidImgCodeUtils.increment(KEY_TOTAL, CACHE_SECONDS);
 
        // 可以将图片合并传入前端  也可以直接传数据汉字给前端
        // 创建顶部图片
        BufferedImage bi = new BufferedImage(image.getWidth(), 25, BufferedImage.TYPE_INT_RGB);
        Graphics gra = bi.getGraphics();
 
        // 设置背景颜色
        gra.setColor(Color.WHITE);
        // 填充区域
        gra.fillRect(0, 0, bi.getWidth(), bi.getHeight());
 
        // 设置边框颜色
        gra.setColor(Color.BLUE);
        // 设置边框区域
        gra.drawRect(1, 1, bi.getWidth() - 2, bi.getHeight() - 2);
 
        // 设置文字背景颜色
        Font font = new Font("Microsoft YaHei", Font.BOLD, 16);
        gra.setFont(font);
        gra.setColor(Color.BLACK);
        gra.drawString("按顺序点击：" + sb.toString(), (bi.getWidth() - 10*font.getSize())/2, bi.getHeight()/2 + font.getSize()/2);//设置文字字体 与位子  居中
 
        BufferedImage combined = new BufferedImage(image.getWidth(), image.getHeight() + bi.getHeight(), BufferedImage.TYPE_INT_RGB);
 
        Graphics g = combined.getGraphics();      //合并
        g.drawImage(bi, 0, 0, null);
        g.drawImage(image, 0, bi.getHeight(), null);
        outStream=  response.getOutputStream();
        ImageIO.write(combined, "jpg", outStream);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (outStream != null) {
                    outStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
 
    @Action("/code/verify")
    public void verify() throws IOException {
        Map<String, Object> data = new HashMap<String, Object>();
        data.put("result", false);
        String value = request.getParameter("code");
        String sessionid = request.getSession().getId();
        if (RedisValidImgCodeUtils.get(sessionid + KEY) == null) {
            printWebJson(JSON.toJSONString(data));
             return;
        }
        List<String> sValue = (List<String>) RedisValidImgCodeUtils.get(sessionid + KEY);
 
        //取到数据后直接清掉redis
        RedisValidImgCodeUtils.del(sessionid + KEY);
 
        Constant.LOGGER.info("**前端请求数据***"+value);
        Constant.LOGGER.info("**后端实际数据**"+sValue.toString());
 
        //为null 或者"" 或者 " "
        if (StringUtils.isBlank(value) || sValue == null || sValue.size() < 1) {
            printWebJson(JSON.toJSONString(data));
            return;
        }
 
        String [] valueStr = value.split(",");
        if(valueStr.length != sValue.size() || valueStr.length != 4){
            printWebJson(JSON.toJSONString(data));
            return;
        }
 
        /*判断坐标参数是否正确*/
        String str = "";
        for (int i = 0; i < valueStr.length; i++) {
            str = valueStr[i].toString();
            if(StringUtils.isBlank(str) || StringUtils.isBlank(sValue.get(i).toString())){
                printWebJson(JSON.toJSONString(data));
                return;
            }
            String [] vL = valueStr[i].toString().split("_");
            String [] svL = sValue.get(i).toString().split("_");
            if(vL.length != svL.length || svL.length != 2){
                printWebJson(JSON.toJSONString(data));
                return;
            }
            //x轴  y轴判断    坐标点在左上角 ，图片宽度30px  点击范围扩大12px，  范围在      x-13 < x <x+13  ;
            if(!(Integer.parseInt(svL[0])-ERROR_AMOUNT < Integer.parseInt(vL[0])-15 && Integer.parseInt(vL[0])-15 < Integer.parseInt(svL[0])+ERROR_AMOUNT )
                || !(Integer.parseInt(svL[1])-ERROR_AMOUNT < Integer.parseInt(vL[1])-15 && Integer.parseInt(vL[1])-15 < Integer.parseInt(svL[1])+ERROR_AMOUNT)){
                //增加验证失败次数
                RedisValidImgCodeUtils.increment(KEY_FAIL, CACHE_SECONDS);
                printWebJson(JSON.toJSONString(data));
                return;
            }
        }
        //增加验证通过次数
        RedisValidImgCodeUtils.increment(KEY_SUCC, CACHE_SECONDS);
        data.put("result", true);
        printWebJson(JSON.toJSONString(data));
    }
 
    /**
     * 生成背景图片
     * @return
     */
    public BufferedImage getBackGround(){
        int width=300;           //指定生成验证码的宽度
        int height=200;          //指定生成验证码的高度
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        Graphics2D g2d = (Graphics2D)g;             //创建Graphics2D对象
        Random random = new Random();
//        Font mFont = new Font("黑体", Font.BOLD, 16); //定义字体样式
//        g.setColor(getRandColor(200, 250));    //背景色
        g.fillRect(0, 0, width, height);        //绘制背景
//        g.setFont(mFont);                       //设置字体
        g.setColor(getRandColor(180, 200));    //线条色
 
        //绘制88根位置和颜色全部为随机产生的线条，该线条为2f
        for (int i = 0; i < 88; i++) {
            int x = random.nextInt(width-1);
            int y = random.nextInt(height-1);
            int x1 = random.nextInt(100)+1;
            int y1 = random.nextInt(120)+1;
            BasicStroke bs = new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
            Line2D line = new Line2D.Double(x,y,x+x1,y+y1);
            g2d.setStroke(bs);
            g2d.draw(line);             //绘制直线
//            g2d.setColor(getRandColor(random, 30, 150));  //随机每条线条的颜色
        }  
 
        //输出生成的验证码图片
        g.dispose();
        return image;
    }
 
    private static Color getRandColor(Random random, int fc, int bc){
        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);
    }  
 
    private static String[] generateCheckCode() {
        String[] res = new String[2];
        Random random = new Random();
        int intTemp;
        int intFirst = random.nextInt(100);
        int intSec = random.nextInt(100);
        String checkCode = "";
        int result = 0;
        switch (random.nextInt(6)) {
            case 0:
                if (intFirst < intSec) {
                    intTemp = intFirst;
                    intFirst = intSec;
                    intSec = intTemp;
                }
                checkCode = intFirst + " - " + intSec + " = ?";
                result = intFirst-intSec;
                break;
            case 1:
                if (intFirst < intSec) {
                    intTemp = intFirst;
                    intFirst = intSec;
                    intSec = intTemp;
                }
                checkCode = intFirst + " - ? = "+(intFirst-intSec);
                result = intSec;
                break;
            case 2:
                if (intFirst < intSec) {
                    intTemp = intFirst;
                    intFirst = intSec;
                    intSec = intTemp;
                }
                checkCode = "? - "+intSec+" = "+(intFirst-intSec);
                result = intFirst;
                break;
            case 3:
                checkCode = intFirst + " + " + intSec + " = ?";
                result = intFirst + intSec;
                break;
            case 4:
                checkCode = intFirst + " + ? ="+(intFirst+intSec);
                result = intSec;
                break;
            case 5:
                checkCode = "? + " + intSec + " ="+(intFirst+intSec);
                result = intFirst;
                break;
        }
        res[0] = checkCode;
        res[1] = String.valueOf(result);
        Constant.LOGGER.info("result=" + result);
        return res;
    }  
 
    @Action("/code/calc")
    public void calcCode() throws IOException{
        int width = 140, height = 37;
        try {
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = image.getGraphics();
            Random random = new Random();
            g.setColor(getRandColor(random, 200, 250));
            g.fillRect(0, 0, width, height);  
 
            String[] fontTypes = { "\u5b8b\u4f53", "\u65b0\u5b8b\u4f53", "\u9ed1\u4f53", "\u6977\u4f53", "\u96b6\u4e66" };
            int fontTypesLength = fontTypes.length;  
 
            g.setColor(getRandColor(random, 160, 200));
            g.setFont(new Font("Times New Roman", Font.PLAIN, 14 + random.nextInt(6)));  
 
            for (int i = 0; i < 255; 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);
            }  
 
            String[] result = generateCheckCode();
            RedisValidImgCodeUtils.save(request.getSession().getId() + "calc_code", result[1]);
            String [] baseChar = result[0].split(" ");
            for (int i = 0; i < baseChar.length; i++) {
                g.setColor(getRandColor(random, 30, 150));
                g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)], Font.BOLD, 22 + random.nextInt(6)));
                g.drawString(baseChar[i], 24 * i + 10, 24);
            }
            g.dispose();
            //发送图片
            ResponseUtil.sendImg(response, image, "image/jpeg", "code", "jpg");
        } catch (IllegalStateException e) {
            Constant.LOGGER.error(e.getMessage());
            e.printStackTrace();
        }
    }
 
    @Action("/code/getRandomCode")
    public void getRandomCode() throws IOException{
        // TODO Auto-generated method stub
        //设置不缓存图片
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "No-cache");
        response.setDateHeader("Expires", 0);
        //指定生成的响应图片
        response.setContentType("image/jpeg");
        int width=140;           //指定生成验证码的宽度
        int height=37;          //指定生成验证码的高度
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics g = image.getGraphics();
        Graphics2D g2d = (Graphics2D)g;             //创建Graphics2D对象
        Random random = new Random();
        Font mFont = new Font("黑体", Font.BOLD, 22); //定义字体样式
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);        //绘制背景
        g.setFont(mFont);                       //设置字体
        g.setColor(getRandColor(180, 200));  
 
        //绘制100根位置和颜色全部为随机产生的线条，该线条为2f
        for (int i = 0; i < 100; i++) {
            int x = random.nextInt(width-1);
            int y = random.nextInt(height-1);
            int x1 = random.nextInt(6)+1;
            int y1 = random.nextInt(12)+1;
            BasicStroke bs = new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
            Line2D line = new Line2D.Double(x,y,x+x1,y+y1);
            g2d.setStroke(bs);
            g2d.draw(line);             //绘制直线
        }  
 
        //输出由英文，数字和中文随机组成的验证文字，具体的组合方式根据生成随机数确定
        String sRand = "";
        //输出随机的验证文字
        String ctmp = "";
        int itmp = 0;
        for(int i = 0;i<4;i++){
            switch (random.nextInt(2)) {
            case 0:
                itmp = random.nextInt(26)+65;               //生成A~Z的字母
                ctmp = String.valueOf((char)itmp);
                break;
            default:
                ctmp = String.valueOf(random.nextInt(8)+2);       //生成2~9的数字
                break;
            }
            sRand+=ctmp;
            Color color = new Color(20+random.nextInt(110), 20+random.nextInt(110), 20+random.nextInt(110));
            g.setColor(color);  
 
            //将生成的随机数进行随机缩放病旋转指定角度
            //将文字旋转指定角度
            Graphics2D g2d_word = (Graphics2D)g;
            AffineTransform trans = new AffineTransform();
            trans.rotate(random.nextInt(45)*3.14/180, 15*i+8, 7);
            //缩放文字
            /*float scaleSize = random.nextFloat()+0.8f;
            if(scaleSize > 1f){
                scaleSize = 1f;
            }
            trans.scale(scaleSize, scaleSize); */
            g2d_word.setTransform(trans);
            g.drawString(ctmp, 20*i+18, 18);   //每个字的间距xy
        }
        //将生成的验证码保存道session中
        RedisValidImgCodeUtils.save(request.getSession().getId() + "randCheckCode", sRand);
 
        //输出生成的验证码图片
        g.dispose();
        ImageIO.write(image, "JPEG", response.getOutputStream());
    }  
 
    public Color getRandColor(int s,int e){
        Random random = new Random();
        if(s>255)s = 255;
        if(e>255)e = 255;
        int r = s+random.nextInt(e-s);
        int g = s+random.nextInt(e-s);
        int b = s+random.nextInt(e-s);
        return new Color(r, g, b);
    }  
 
    public static String getRandomChineseChar() {
        String str = null;
        int hs, ls;
        Random random = new Random();
        hs = (176 + Math.abs(random.nextInt(39)));
        ls = (161 + Math.abs(random.nextInt(93)));
        byte[] b = new byte[2];
        b[0] = (new Integer(hs).byteValue());
        b[1] = (new Integer(ls).byteValue());
        try  {
            str = new String(b, "GBk"); //转成中文
        } catch (UnsupportedEncodingException ex) {
            ex.printStackTrace();
        }
        return str;
    }
 
}

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<script src="${web_url}/api/themes/theme_default/media/js/jquery.js"></script>
<title>验证码</title>
</head>
<body>
<div style="text-align:center;position:relative;">
    <!--<h2>这是点击的验证码</h2> -->
    <!-- 这是点击的验证码 -->
    <img id="codeT3" src="${web_url}/api/code/getVerificationCode.html?flag=" +Math.random()"/>
    </br>
    <!--
        <input type="button" value="刷新" onclick="getCodeTree();" />
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    <input type="button" value="校验" onclick="cheakOutTree();" />
     -->
    <select id="codeSelect" style="display: none;"></select>
    <img  src="${web_url}/api/refresh.png" style="position:absolute;right:0;top:0; width:20px; height: 20px;" onclick="getCodeTree();" />
</div>
 
<script type="text/javascript">
//点击次数
var number=0;
 
//获取验证码3
function getCodeTree() {
    number = 0;
    $(".zhezhao").remove();
    document.getElementById("codeSelect").options.length = 0;
    $("#codeT3").attr("src","${web_url}/api/code/getVerificationCode.html?flag="+Math.random());
}
 
$(function() {
    $("#codeT3").bind("click", function(ev) {
        var oEvent = ev || event;
        //var number = $("#codeSelect option").length;
        number++;
 
        if (number > 4) {
            return;
        }
 
        var x = oEvent.pageX;
        var y = oEvent.pageY;
        var img = document.getElementById('codeT3');    //获取图片的原点
        var nodex = getNodePosition(img)[0];//原点x 与原点y
        var nodey = getNodePosition(img)[1];
 
        var xserver = parseInt(x) - parseInt(nodex);
        var yserver = parseInt(y) - parseInt(nodey);
 
        $("#codeSelect").append(
        "<option value='"+ (parseInt(number)+1) +"'>" + xserver + "_" + yserver
        + "</option>");
        var oDiv = document.createElement('img');
        oDiv.style.left = (parseInt(x)-15) + 'px'; // 指定创建的DIV在文档中距离左侧的位置    图片大小30 左右移动5
        oDiv.style.top = (parseInt(y) -15) + 'px'; // 指定创建的DIV在文档中距离顶部的位置
        oDiv.style.border = '1px solid #FF0000'; // 设置边框
        oDiv.style.position = 'absolute'; // 为新创建的DIV指定绝对定位
        oDiv.style.width = '30px'; // 指定宽度
        oDiv.style.height = '30px'; // 指定高度
        //oDiv.src = 'select.png';
        oDiv.style.opacity = '0.5'; //透明度
        oDiv.className = 'zhezhao';//加class 点刷新后删除遮罩
        document.body.appendChild(oDiv);
 
        //第四次点击后自动提交
        if (number == 4) {
            cheakOutTree();
        }
 
    });
 
})
 
//校验验证码
function cheakOutTree() {
    var txt = "";
    $("#codeSelect option").each(function (){
          var text = $(this).text();
          if(txt == ""){
              txt = text;
          }else{
              txt = txt + "," + text;
          }
     });
     $.ajax({
        type:"post",
        url:"${web_url}/api/code/verify.html",
        data : {"code" : txt},
        cache : false,
        success : function(data) {
           alert(data.result);
           if (!data.result) {
               getCodeTree();
           }
        }
    });
}
 
function getNodePosition(node) {
    var top = left = 0;
    while (node) {
        if (node.tagName) {
            top = top + node.offsetTop;
            left = left + node.offsetLeft;
            node = node.offsetParent;
        }
        else {
            node = node.parentNode;
        }
    }
    return [left, top];
}
 
</script>  
 
</body>
</html>