google zxing读取、生成一维码、二维码图片

/** * * 丰益信息 * Copyright (c) 2014-2015 Wilmar,Inc.All Rights Reserved. */ package com.test.zxing; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import java.io.OutputStream; import java.util.Hashtable; import javax.imageio.ImageIO; import com.google.zxing.BarcodeFormat; import com.google.zxing.BinaryBitmap; import com.google.zxing.DecodeHintType; import com.google.zxing.EncodeHintType; import com.google.zxing.LuminanceSource; import com.google.zxing.MultiFormatReader; import com.google.zxing.MultiFormatWriter; import com.google.zxing.Result; import com.google.zxing.WriterException; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.BitMatrix; import com.google.zxing.common.HybridBinarizer; /** * 使用ZXing2.3，生成条码的辅助类。可以编码、解码。编码使用code包，解码需要javase包。 * * @author wilmar * @version $Id: ZxingUtil.java, v 0.1 2015-1-13 上午11:20:32 wilmar Exp $ */ public class ZxingUtil { private static final String CHARSET = "utf-8"; private static final int BLACK = 0xFF000000; private static final int WHITE = 0xFFFFFFFF; /** * 禁止生成实例，生成实例也没有意义。 */ private ZxingUtil() { } /** * 生成矩阵，是一个简单的函数，参数固定，更多的是使用示范。 * * @param text * @param width * @param height * @return */ public static BitMatrix toQRCodeMatrix(String text, Integer width, Integer height) { if (width == null || width < 300) { width = 300; } if (height == null || height < 300) { height = 300; } // 二维码的图片格式 Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); // 内容所使用编码 hints.put(EncodeHintType.CHARACTER_SET, CHARSET); BitMatrix bitMatrix = null; try { bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints); } catch (WriterException e) { // TODO Auto-generated catch block e.printStackTrace(); } // 生成二维码 // File outputFile = new File("d:"+File.separator+"new.gif"); // MatrixUtil.writeToFile(bitMatrix, format, outputFile); return bitMatrix; } /** * 将指定的字符串生成二维码图片。简单的使用示例。 * * @param text * @param file * @param format * @return */ public boolean toQrcodeFile(String text, File file, String format) { BitMatrix matrix = toQRCodeMatrix(text, null, null); if (matrix != null) { try { writeToFile(matrix, format, file); return true; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return false; } /** * 根据点矩阵生成黑白图。 * * @param matrix * @return */ public static BufferedImage toBufferedImage(BitMatrix matrix) { int width = matrix.getWidth(); int height = matrix.getHeight(); BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); for (int x = 0; x < width; x++) { for (int y = 0; y < height; y++) { image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE); } } return image; } /** * 将字符串编成一维条码的矩阵 * * @param str * @param width * @param height * @return */ public static BitMatrix toBarCodeMatrix(String str, Integer width, Integer height) { if (width == null || width < 200) { width = 200; } if (height == null || height < 50) { height = 50; } try { // 文字编码 Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>(); hints.put(EncodeHintType.CHARACTER_SET, CHARSET); BitMatrix bitMatrix = new MultiFormatWriter().encode(str, BarcodeFormat.CODE_128, width, height, hints); return bitMatrix; } catch (Exception e) { e.printStackTrace(); } return null; } /** * 根据矩阵、图片格式，生成文件。 * * @param matrix * @param format * @param file * @throws IOException */ public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, file)) { throw new IOException("Could not write an image of format " + format + " to " + file); } } /** * 将矩阵写入到输出流中。 * * @param matrix * @param format * @param stream * @throws IOException */ public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException { BufferedImage image = toBufferedImage(matrix); if (!ImageIO.write(image, format, stream)) { throw new IOException("Could not write an image of format " + format); } } /** * 解码，需要javase包。 * * @param file * @return */ public static String decode(File file) { BufferedImage image; try { if (file == null || file.exists() == false) { throw new Exception(" File not found:" + file.getPath()); } image = ImageIO.read(file); LuminanceSource source = new BufferedImageLuminanceSource(image); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Result result; // 解码设置编码方式为：utf-8， Hashtable hints = new Hashtable<Object, Object>(); hints.put(DecodeHintType.CHARACTER_SET, CHARSET); result = new MultiFormatReader().decode(bitmap, hints); return result.getText(); } catch (Exception e) { e.printStackTrace(); } return null; } }