[Java] 识别图片验证码_无忧SuperFan

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[Java] 识别图片验证码

(2011-01-02 18:14:47)

标签：

杂谈

分类： Java

自动识别图形验证码

现在大多数网站都采用了验证码来防止暴力破解或恶意提交。但验证码真的就很安全吗？真的就不能被机器识别？？
我先讲讲我是怎么实现站外提交留言到一个网站的程序。
这个网站的留言版大致如下：

http://www.java3z.com/cwbwebhome/article/article2/img7/liuyanbanLT.jpg识别图片验证码" />

我一看这种简单的4位数字验证码，马上就感觉到有戏了。直觉告诉我让电脑来识别这些图片验证码据对简单o(∩_∩)o...
首先我马上在这个页面用右键菜单看源代码
http://www.java3z.com/cwbwebhome/article/article2/img7/32112.jpg识别图片验证码" />

知道验证码获取页面后你可以直接用 http://www.XXXX.com/imgchk/validatecode.asp 这样去访问你会发现你打开的就是一个验证码图片。

http://www.java3z.com/cwbwebhome/article/article2/img7/yanzhengma_2022.jpg识别图片验证码" />

对的其实返回的就是图片文件的2进制流而已。接着先用右键保存一张验证码的图片。因为要开始分析这张图片了，什么用什么工具？PhotoShop????不用就一般的画图工具就可以了。我们要搞清楚的是这几个数字分别占几个像素就可以了。

http://www.java3z.com/cwbwebhome/article/article2/img7/kuantu.jpg识别图片验证码" />

可以看出一个数字5*9 也就是45个像素。恩这就可以了另外我们可以看出默认区域就是白色
（姑且说是白色因为我们肉眼看就是白色）
那么我的程序识别原理就是固定去扫描这45个像素点。看每个点的颜色是不是和默认的颜色一致
一致的话就标记为0 ，不一致就标记为1 。
如一个数子是2 那么我的程序扫描出来的图像就应该是：
011110
100001
000001
000001
000010
000100
001000
010000
100000
111111
如果一个数字是7那么扫描出来的图像就是：
111111
100001
000010
000010
000100
000100
001000
001000
010000
010000

恩,就这么简单呵呵。下面给出图像扫描的java类 (不好意思，在我会的语言里面除开java就剩sql了)

package com.util;

//~--- JDK imports ------------------------------------------------------------

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

import java.awt.*;
import java.awt.image.*;

import java.io.*;
import java.io.FileOutputStream;
import java.io.OutputStream;

import java.net.*;

import javax.imageio.*;
import javax.imageio.ImageIO;

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedBlock.gif识别图片验证码" /> public class ImgIdent {

    // 数字字符比特表
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private final long[][] NUMERIC = {
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 512104545, 562436190 },    // '0'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 148931080, 136348222 },    // '1'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 511971394, 69273663 },     // '2'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 511971406, 17045598 },     // '3'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 35168914, 586948743 },     // '4'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 1065486398, 17045598 },    // '5'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 239208494, 830871646 },    // '6'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 1065623684, 69239824 },    // '7'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 512104542, 562436190 },    // '8'
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         { 512104547, 486805660 }
    };                               // '9'

    // 字框高
    private int intCharHeight = 10;

    // 字框横向间隙
    private int intCharSpaceH = 5;

    // 字框纵向间隙
    private int intCharSpaceY = 1;

    // 字框宽
    private int           intCharWidth = 5;
    private int           IntImgHeight;
    private BufferedImage img;
    private int           intBgColor;
    private int           intCharColor;
    private int           intImgWith;
    private int           intMaxX;
    private int           intMaxY;
    private int           intMinX;
    private int           intMinY;

    // 座标原点
    private Point  pOrigin;
    private String strNum;

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public ImgIdent(BufferedImage img) throws IOException {
        this.img = img;
        init();
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public ImgIdent(File file) throws IOException {
        img = ImageIO.read(file);
        init();
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public ImgIdent(URL url) throws IOException {
        img = ImageIO.read(url);
        init();
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private void init() {

        // 得到图象的长度和宽度
        intImgWith   = img.getWidth();
        IntImgHeight = img.getHeight();

        // 得到图象的背景颜色
        intBgColor = img.getRGB(7, 4);

        // System.out.println(intBgColor);

        // 初始化图象原点座标
        pOrigin = new Point(0, 0);
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private void getBaseInfo() {
        System.out.println(intBgColor + "|" + intCharColor);
        System.out.println(intMinX + "|" + intMinY + "|" + intMaxX + "|" + intMaxY);
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private Point[] getCharRange(int intNo) {

        // 左上右下点座标
        Point pTopLeft     = new Point(0, 0);
        Point pBottomRight = new Point(0, 0);

        // 左上点
        pTopLeft.x = pOrigin.x + intCharWidth * (intNo - 1) + intCharSpaceH * (intNo - 1);
        pTopLeft.y = pOrigin.y;

        // 右下点
        pBottomRight.x = 1 + pOrigin.x + intCharWidth * intNo + intCharSpaceH * (intNo - 1) - 1;
        pBottomRight.y = pOrigin.y + intCharHeight - 1;

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         return new Point[] { pTopLeft, pBottomRight };
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private char getBit(int x, int y) {
        int intCurtColor;

        intCurtColor = img.getRGB(x, y);

        //System.out.println("[" + x + "," + y + "]" + intCurtColor + "==" + intBgColor + "==>" + (Math.abs(intCurtColor) >7308252));
//      return (Math.abs(intCurtColor) >= 5689325)
//              ? '0'
//              : '1';
        return (intCurtColor == intBgColor)
               ? '0'
               : '1';

        // 5689325    6008535
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     private String getCharString(int intNo) {

        // 本字符的左上右下点座标
        Point[] p            = getCharRange(intNo);
        Point   pTopLeft     = p[0];
        Point   pBottomRight = p[1];

        // 换算边界值
        int intX1, intY1, intX2, intY2;

        intX1 = pTopLeft.x;
        intY1 = pTopLeft.y;
        intX2 = pBottomRight.x;
        intY2 = pBottomRight.y;

//      System.out.println("intX1=" + intX1);
//      System.out.println("intY1=" + intY1);
//      System.out.println("intX2=" + intX2);
//      System.out.println("intY2=" + intY2);

        // 在边界内循环取象素
        int    i, j;
        String strChar = "";

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         for (i = intY1; i <= intY2; i++) {
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             for (j = intX1; j <= intX2; j++) {
                System.out.print(getBit(j, i));
                strChar = strChar + getBit(j, i);
            }

            System.out.println();
        }

        System.out.println();

        return strChar;
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public int getNum(int intNo) {

        // 取得位字符串
        String strChar = getCharString(intNo);

        // System.out.println(intNo+"=="+strChar);
        // 取得串高位串和低位串
        String strCharHigh = strChar.substring(0, strChar.length() / 2);
        String strCharLow  = strChar.substring(strChar.length() / 2);

        // 计算高位和低位值
        long lCharHigh = Long.parseLong(strCharHigh, 2);

        System.out.println(lCharHigh);

        long lCharLow = Long.parseLong(strCharLow, 2);

        System.out.println(lCharLow);

        // 在数字中循环比较
        int intNum = '*';

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         for (int i = 0; i <= 9; i++) {
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             if ((lCharHigh == NUMERIC[i][0]) && (lCharLow == NUMERIC[i][1])) {
                intNum = i;

                break;
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             } else {
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />                 if ((lCharHigh == 834533329) && (lCharLow == 242870177)) {
                    intNum = 6;
                }    // 834533329 242870177
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />                         else {
                    intNum = 1;
                }    // 默认为1   低位为    937393609  937393601
            }
        }

        return intNum;
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public String getValidatecode(int length) {
        String strNum = "";

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         for (int i = 1; i <= length; i++) {
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             synchronized (this) {
                strNum += String.valueOf(getNum(i));
            }
        }

        return strNum;
    }

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />     public void saveJPEG(BufferedImage iag, String savePath) throws FileNotFoundException, IOException {
        OutputStream     jos     = new FileOutputStream(savePath);
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(jos);
        JPEGEncodeParam  jpegEP  = JPEGCodec.getDefaultJPEGEncodeParam(iag);

        jpegEP.setQuality((float) 1, true);
        encoder.encode(iag, jpegEP);
        jos.flush();
        jos.close();
    }
}

恩这样数字是可以识别出来了，可以我要怎么完成提交那块的工作呢？好在Apache已经为我做完了。我用了
HttpClient这样一个模拟Http协议的小工具包。我只要往那个 Add_MSG.asp里面提交就完了。

package com.util;

//~--- non-JDK imports --------------------------------------------------------

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpClientParams;
import org.apache.commons.httpclient.params.HttpMethodParams;

//~--- JDK imports ------------------------------------------------------------

import java.awt.image.BufferedImage;

import java.io.InputStream;

import javax.imageio.ImageIO;

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedBlock.gif识别图片验证码" /> public class MyHttpClient {

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />
    public synchronized void doSomeThing(String title, String name, String Content, String proIP, int port,
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             boolean usePro) {

        // 构造HttpClient的实例
        HttpClient       httpClient   = new HttpClient();
        HttpClientParams clientParams = new HttpClientParams();

        // 隐藏自己请求相关的信息
        clientParams.setParameter("http.useragent", "Mozilla/4.0 (compatible; FIREFOX 9.0; IBM AIX 5)");

        // httpClient.getHttpConnectionManager().getParams().setSoTimeout(30 * 1000);
        clientParams.setHttpElementCharset("GBK");

        HttpState httpState = new HttpState();

        httpClient.setParams(clientParams);
        httpClient.getParams().setParameter(HttpClientParams.HTTP_CONTENT_CHARSET, "GBK");
        httpClient.setState(httpState);
        clientParams.setVersion(HttpVersion.HTTP_1_1);

        // httpClient.getHostConfiguration().setProxy("148.233.159.58", 3128);

        if (usePro)    // 使用代理
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         {
            httpClient.getHostConfiguration().setProxy(proIP, port);
        }

        // 创建GET方法的实例
        GetMethod getMethod = new GetMethod("http://www.XXXcom/Guestbook/imgchk/validatecode.asp");

        // 使用系统提供的默认的恢复策略
        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());

http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         try {

            // 执行getMethod
            int statusCode = httpClient.executeMethod(getMethod);

            // System.out.println(statusCode);
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />             if (statusCode != HttpStatus.SC_OK) {
                System.err.println("Method failed: " + getMethod.getStatusLine());
            }    // 读取内容

            InputStream inStream = getMethod.getResponseBodyAsStream();

            // 处理内容
            // System.out.println(new String(responseBody));
            BufferedImage iag      = ImageIO.read(inStream);
            ImgIdent      imgIdent = new ImgIdent(iag);

            // imgIdent.saveJPEG(iag, "C:/ddd.jpg");
            String validate = imgIdent.getValidatecode(4);

            System.out.println(validate);

            PostMethod method  = new PostMethod("http://www.XXX.com/Guestbook/add_msg.asp");
            String     connect = Content;
            String     Title   = title;

            method.setParameter("subject", Title);
            method.setParameter("g_name", name);
            method.setParameter("companyname", "");
            method.setParameter("mail", "");
            method.setParameter("homepageurl", "http://");
            method.setParameter("pic", "p5.gif");
            method.setParameter("validatecode", validate);
            method.setParameter("content", connect);

//          if (todo) {
            int code = httpClient.executeMethod(method);

            // String Stringresponse = new String(method.getResponseBodyAsString().getBytes("8859_1"));
            // 打印返回的信息
            // System.out.println(Stringresponse);
//          }

            method.releaseConnection();

//          System.out.println(iag.getHeight());
//          System.out.println(iag.getWidth());
//          //背景颜色
//          intBgColor = iag.getRGB(38, 0);
//          System.out.println("intBgColor=" + intBgColor);
//
//
//          intBgColor = iag.getRGB(0, 0);
//          System.out.println("intBgColor=" + intBgColor);
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         } catch (Exception e) {

            // 发生网络异常
            e.printStackTrace();
http://www.java3z.com/cwbwebhome/article/article2/img/ContractedSubBlock.gif识别图片验证码" />         } finally {}

        // 释放连接   getMethod.releaseConnection();  }
        getMethod.releaseConnection();
    }
}

恩就这样了，最后结合SAF整成这样了。什么？为什么不用SWT？想过了SWING才是王道o(∩_∩)o...
http://www.java3z.com/cwbwebhome/article/article2/img7/jieguo.jpg识别图片验证码" />

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