java从图片中识别文字

package com.dream.common;

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.FileImageInputStream;

import javax.imageio.stream.ImageInputStream;

import javax.imageio.stream.ImageOutputStream;

import com.github.jaiimageio.plugins.tiff.TIFFImageWriteParam;

/**

 * 识别图片中的文字

 *

 * @author zlj

 *

 */

public class ImageIOHelper {

	/**

	 * 创建临时图片文件

	 *

	 * @param imageFile

	 * @return

	 * @throws IOException

	 */

	public File createImage(File imageFile) throws IOException {

		Iterator<ImageReader> readers = ImageIO.getImageReaders(new FileImageInputStream(imageFile));

		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));

		File tempFile = tempImageFile(imageFile);

		ImageOutputStream ios = ImageIO.createImageOutputStream(tempFile);

		writer.setOutput(ios);

		writer.write(streamMetadata, image, tiffWriteParam);

		ios.close();

		iis.close();

		writer.dispose();

		reader.dispose();

		return tempFile;

	}

	/**

	 * 添加后缀 tempfile

	 *

	 * @param imageFile

	 * @return

	 * @throws IOException

	 */

	private File tempImageFile(File imageFile) throws IOException {

		String path = imageFile.getPath();

		StringBuffer strB = new StringBuffer(path);

		strB.insert(path.lastIndexOf('.'), "_text_recognize_temp");

		String s = strB.toString().replaceFirst("(?<=//.)(//w+)$", "tif");

		Runtime.getRuntime().exec("attrib " + "\"" + s + "\"" + " +H"); // 设置文件隐藏

		return new File(strB.toString());

	}

}package com.dream.common;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

import org.jdesktop.swingx.util.OS;

/**

 * 从图片中识别文字

 * @author zlj

 *

 */

public class OCRUtil {

	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 (x86)//Tesseract-OCR";// ocr默认安装路径

	private String transname = "chi_sim";// 默认中文语言包，识别中文

	/**

	 * 从图片中识别文字

	 * @param imageFile

	 * @param imageFormat

	 * @return text recognized in image

	 * @throws Exception

	 */

	public String recognizeText(File imageFile) throws Exception {

		File tempImage = new ImageIOHelper().createImage(imageFile);

		return ocrImages(tempImage, imageFile);

	}

	/**

	 * 识别图片中的文字

	 * @param tempImage

	 * @param imageFile

	 * @return

	 * @throws IOException

	 * @throws InterruptedException

	 */

	private String ocrImages(File tempImage, File imageFile) throws IOException, InterruptedException {

		File outputFile = new File(imageFile.getParentFile(), "output");

		Runtime.getRuntime().exec("attrib " + "\"" + outputFile.getAbsolutePath() + "\"" + " +H"); // 设置文件隐藏

		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(transname);

		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();

		tempImage.delete();// 删除临时正在工作文件

		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();

	}

	public static void main(String[] args) throws Exception {

		System.out.println("begin");

		String path = "F://test1.png";

		String valCode = new OCRUtil().recognizeText(new File(path));

		System.out.println(valCode);

		System.out.println("end");

	}

}

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