java识别验证码

12/12/2015来源:Java教程人气:2323

所需资源下载链接(资源免费,重在分享)

Tesseract:http://download.csdn.net/detail/chenyangqi/9190667

jai_imageio-1.1-alpha,swingx-1.0:http://download.csdn.net/detail/chenyangqi/9190683

HttpWatch PRofessional:http://download.csdn.net/detail/chenyangqi/9208339

项目简介:

  我们学校使用的是校园锐捷客户端上网,本人因长时间不用密码,早已忘记密码,只记得是六位纯数字,又不想去服务中心换密码,就想用Http模拟一下锐捷网页版实现登陆,遍历一下000000-999999的密码。也顺便学习一下。废话不说了,直接进入主题,登陆页面如下中规中矩,用户名密码验证码

  要实现模拟登陆难点有两个,一个是Http请求中Cookie的管理,一个是验证码识别,改篇文章讲解如何识别验证码,至于模拟登陆请看本人后期的博文(博文连接:http://www.cnblogs.com/chenyangqi/p/4906376.html)

  

1:下载安装Tesseract

  本人已提供下载链接(文章开头处提供下载链接),下载好安装即可,压缩包内还提供了汉语语言包的,Tesseract是一款支持汉语识别的OCR,这也是我选择他的原因,至于安装和验证安装是否成功,可自行百度,我就不废话了。

我安装的位置为:D:\Program Files (x86)\Tesseract-OCR,该目录下的结构如下(其中tessdata就是存放语言包的位置)

二:验证码获取

  下载HttpWatch(文章开头处提供下载链接),安装,并在IE中使用,对登陆页面进行抓包,找到验证码的URL,如下图(HttpWatch安装使用方法,自行百度);

获得URL后键验证码图片下载到本地。比如:D://verifycode.jpg

下载图片到本地代码如下:

private static void getImage(String name_get, String passWord_get) {
        GetMethod get = new GetMethod(
                "你的验证码URL");
        try {
            client.executeMethod(get);
            File storeFile = new File("D:/verifycode.jpg");  //保存在本地的路径
            FileOutputStream output = new FileOutputStream(storeFile);
            InputStream is = get.getResponseBodyAsStream();
            FileOutputStream fos = new FileOutputStream(storeFile);
            byte[] b = new byte[1024];
            while ((is.read(b)) != -1) {
                fos.write(b);
            }
            is.close();
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

 

 

  

三:java实现验证码识别

  代码如下,eclipse新建一个java项目,引入jai_imageio-1.1-alpha.jar,swingx-1.0.jar这两个包(文章开头处提供下载链接),导入到项目中。OK,准备写代码吧,共两个类ORC.class  ImageIOhelper.class(只需修改一下你安装Tesseract的路径,可直接引入你的项目使用)。

OCR.class代码如下:recognizeText(File imageFile, String imageFormat)方法的参数,就是上一步下载的验证码图片在本地的位置。D://verifycode.jpg

package com.cyq.request;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.jdesktop.swingx.util.OS;

public class OCR {
    private final String LANG_OPTION = "-l"; // 英文字母小写l,并非数字1
    private final String EOL = System.getProperty("line.separator");
    private String tessPath = "D://Program Files (x86)//Tesseract-OCR";//Tesseract安装路径

    public String recognizeText(File imageFile, String imageFormat)
            throws Exception {
        File tempImage = ImageIOHelper.createImage(imageFile, imageFormat);
        File outputFile = new File(imageFile.getParentFile(), "output");
        StringBuffer strB = new StringBuffer();
        List<String> cmd = new ArrayList<String>();
        if (OS.isWindowsXP()) {
            cmd.add(tessPath + "//tesseract");
        } else if (OS.islinux()) {
            cmd.add("tesseract");
        } else {
            cmd.add(tessPath + "//tesseract");
        }
        cmd.add("");
        cmd.add(outputFile.getName());

        ProcessBuilder pb = new ProcessBuilder();
        pb.directory(imageFile.getParentFile());

        cmd.set(1, tempImage.getName());
        pb.command(cmd);
        pb.redirectErrorStream(true);

        Process process = pb.start();
        int w = process.waitFor();

        // 删除临时正在工作文件
        tempImage.delete();

        if (w == 0) {
            BufferedReader in = new BufferedReader(new InputStreamReader(
                    new FileInputStream(outputFile.getAbsolutePath() + ".txt"),
                    "UTF-8"));

            String str;
            while ((str = in.readLine()) != null) {
                strB.append(str).append(EOL);
            }
            in.close();
        } else {
            String msg;
            switch (w) {
            case 1:
                msg = "Errors accessing files.There may be spaces in your image's filename.";
                break;
            case 29:
                msg = "Cannot recongnize the image or its selected region.";
                break;
            case 31:
                msg = "Unsupported image format.";
                break;
            default:
                msg = "Errors occurred.";
            }
            tempImage.delete();
        }
        new File(outputFile.getAbsolutePath() + ".txt").delete();
        return strB.toString();
    }
}

ImageIOhelper.class代码如下:

package com.cyq.request;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Locale;

import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;

import com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam;

public class ImageIOHelper {
    /**
     * 图片文件转换为tif格式
     * 
     * @param imageFile
     *            文件路径
     * @param imageFormat
     *            文件扩展名
     * @return
     */
    public static File createImage(File imageFile, String imageFormat) {
        File tempFile = null;
        try {
            Iterator<ImageReader> readers = ImageIO
                    .getImageReadersByFormatName(imageFormat);
            ImageReader reader = readers.next();

            ImageInputStream iis = ImageIO.createImageInputStream(imageFile);
            reader.setInput(iis);
            IIOMetadata streamMetadata = reader.getStreamMetadata();

            TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(
                    Locale.CHINESE);
            tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);

            Iterator<ImageWriter> writers = ImageIO
                    .getImageWritersByFormatName("tiff");
            ImageWriter writer = writers.next();

            BufferedImage bi = reader.read(0);
            IIOImage image = new IIOImage(bi, null, reader.getImageMetadata(0));
            tempFile = tempImageFile(imageFile);
            ImageOutputStream ios = ImageIO.createImageOutputStream(tempFile);
            writer.setOutput(ios);
            writer.write(streamMetadata, image, tiffWriteParam);
            ios.close();

            writer.dispose();
            reader.dispose();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return tempFile;
    }

    private static File tempImageFile(File imageFile) {
        String path = imageFile.getPath();
        StringBuffer strB = new StringBuffer(path);
        strB.insert(path.lastIndexOf('.'), 0);
        return new File(strB.toString().replaceFirst("(?<=//.)(//w+)$", "tif"));
    }

}

 

   Main方法中调用就OK了:

  

private static String getCode() {
        String valCode = null;
        String path = "d://verifycode.jpg";
        try {
            valCode = new OCR().recognizeText(new File(path), "jpg");
       System.out.println("验证码为:"+valCode) }
catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return valCode; }

 

好啦,验证码识别over,至于整个Http登陆的请看我后一篇博文(http://www.cnblogs.com/chenyangqi/p/4906376.html)。

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