项目主页地址：http://code.google.com/p/tesseract-ocr/

相关资源下载地址：http://code.google.com/p/tesseract-ocr/downloads/list

需要下载的资源有：

1、tesseract-ocr-setup-3.01-1.exe

因我本地为windows系统，所以用这个

2、chi_sim.traineddata.gz

中文识别时需要的。

安装tesseract-ocr

自定义安装语言包

在Tesseract-OCR安装目录下找到 tessdata目录，其是用来存放语言包，可把 chi_sim.traineddata.gz 解压缩之后的chi_sim.traineddata文件复制到该目录下即可。

本文使用参考blog中的例子

如下：

package org.img;

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);

            //Read the stream metadata

            IIOMetadata streamMetadata = reader.getStreamMetadata();

            //Set up the writeParam

            TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.CHINESE);

            tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);

            //Get tif writer and set output to file

            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"));

    }

}

package org.img;

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 = "C://Program Files//Tesseract-OCR"; //

注意这个路径，为安装的tesseract-OCR的路径

    //private String tessPath = new File("tesseract").getAbsolutePath();

    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());

        cmd.add(LANG_OPTION);

        cmd.add("chi_sim");

        //cmd.add("eng");

        ProcessBuilder pb = new ProcessBuilder();

        pb.directory(imageFile.getParentFile());

        cmd.set(1, tempImage.getName());

        pb.command(cmd);

        pb.redirectErrorStream(true);

        Process process = pb.start();

        //tesseract.exe 1.jpg 1 -l chi_sim

        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();

            throw new RuntimeException(msg);

        }

        new File(outputFile.getAbsolutePath()+".txt").delete();

        return strB.toString();

    }

}

package org.img;

import java.io.File;

import java.io.IOException;

public class TestOCR {

    /**

     * @param args

     */

    public static void main(String[] args) {

        String path = "D:\\temp\\img\\untitled8.png";

        try {

            String valCode = new OCR().recognizeText(new File(path), "png");

            //6905_1294109277pAj9.jpg

            System.out.println(valCode);

        } catch (IOException e) {

            e.printStackTrace();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

}