java ZXing生成二维码及条码实例分享

java ZXing生成二维码及条码实例分享

1、jar包：   ZXing-core-3.3.0.jar 　　 http://mvnrepository.com/artifact/com.google.zxing/core

ZXing-javase-3.3.0.jar　  http://mvnrepository.com/artifact/com.google.zxing/javase

BufferedImageLuminanceSource.java

package com.webos.util;

import java.awt.Graphics2D;

import java.awt.geom.AffineTransform;

import java.awt.image.BufferedImage;

import com.google.zxing.LuminanceSource;

public class BufferedImageLuminanceSource extends LuminanceSource {

private final BufferedImage image;

private final int left;

private final int top;

public BufferedImageLuminanceSource(BufferedImage image) {

this(image, 0, 0, image.getWidth(), image.getHeight());

}

public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {

super(width, height);

int sourceWidth = image.getWidth();

int sourceHeight = image.getHeight();

if (left + width > sourceWidth || top + height > sourceHeight) {

throw new IllegalArgumentException("Crop rectangle does not fit within image data.");

}

for (int y = top; y < top + height; y++) {

for (int x = left; x < left + width; x++) {

if ((image.getRGB(x, y) & 0xFF000000) == 0) {

image.setRGB(x, y, 0xFFFFFFFF); // = white

}

}

}

this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);

this.image.getGraphics().drawImage(image, 0, 0, null);

this.left = left;

this.top = top;

}

public byte[] getRow(int y, byte[] row) {

if (y < 0 || y >= getHeight()) {

throw new IllegalArgumentException("Requested row is outside the image: " + y);

}

int width = getWidth();

if (row == null || row.length < width) {

row = new byte[width];

}

image.getRaster().getDataElements(left, top + y, width, 1, row);

return row;

}

public byte[] getMatrix() {

int width = getWidth();

int height = getHeight();

int area = width * height;

byte[] matrix = new byte[area];

image.getRaster().getDataElements(left, top, width, height, matrix);

return matrix;

}

public boolean isCropSupported() {

return true;

}

public LuminanceSource crop(int left, int top, int width, int height) {

return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);

}

public boolean isRotateSupported() {

return true;

}

public LuminanceSource rotateCounterClockwise() {

int sourceWidth = image.getWidth();

int sourZtroEceHeight = image.getHeight();

AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);

BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);

Graphics2D g = rotatedImage.createGraphics();

g.drawImage(image, transform, null);

g.dispose();

int width = getWidth();

return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);

}

}

QRCodeUtil.java

package com.webos.util;

import java.awt.BasicStroke;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.Shape;

import java.awt.geom.RoundRectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.OutputStream;

import java.util.Hashtable;

import java.util.Random;

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.MultiFormatReader;

import com.google.zxing.MultiFormatWriter;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**

* @ClassName: QRCodeUtil

* @Description: 二维码编码

* @author Liuy

* @date 2016年7月9日 下午3:03:24

*

*/

public class QRCodeUtil {

// 设置二维码编码格式

private static final String CHARSET = "utf-8";

// 保存的二维码格式

private static final String FORMAT_NAME = "JPG";

// 二维码尺寸

private static final int QRCODE_SIZE = 800;

// LOGO宽度

private static final int LOGO_WIDTH = 80;

// LOGO高度

private static final int LOGO_HEIGHT = 80;

/**

* @Title: createImage

* @Description: 将二维码内容创建到Image流

* @param content 二维码内容

* @param imgPath logo图片地址

* @param needCompress 是否压缩logo图片大小

* @return

* @throws Exception 参数说明

* @return BufferedImage 返回类型

* @throws

*/

private static BufferedImage createImage(String content, String logZtroEoPath, boolean needCompress) throws Exception {

Hashtable hints = new Hashtable();

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

hints.put(EncodeHintType.MARGIN, 1);

BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);

int width = bitMatrix.getWidth();

int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);

}

}

if (logoPath == null || "".equals(logoPath)) {

return image;

}

// 插入logo

QRCodeUtil.insertImage(image, logoPath, needCompress);

return image;

}

/**

* @Title: insertImage

* @Description: 将logo插入到二维码中

* @param source 二维码Image流

* @param imgPath logo地址

* @param needCompress 是否压缩大小

* @throws Exception 参数说明

* @return void 返回类型

* @throws

*/

private static void insertImage(BufferedImage source, String logoPath, boolean needCompress) throws Exception {

File file = new File(logoPath);

if (!file.exists()) {

System.err.println("" + logoPath + " 该文件不存在！");

return;

}

Image src = ImageIO.read(new File(logoPath));

int width = src.getWidth(null);

int height = src.getHeight(null);

if (needCompress) { // 压缩LOGO

if (width > LOGO_WIDTH) {

width = LOGO_WIDTH;

}

if (height > LOGO_HEIGHT) {

height = LOGO_HEIGHT;

}

Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics g = tag.getGraphics();

g.drawImage(image, 0, 0, null); // 绘制缩小后的图

g.dispose();

src = image;

}

// 插入LOGO

Graphics2D graph = source.createGraphics();

int x = (QRCODE_SIZE - width) / 2;

int y = (QRCODE_SIZE - height) / 2;

graph.drawImage(src, x, y, width, height, null);

Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

graph.setStroke(new BasicStroke(3f));

graph.draw(shape);

graph.dispose();

}

/**

* @Title: mkdirs

* @Description: 创建文件夹

* @param destPath 文件夹地址

* @return void 返回类型

* @throws

*/

private static boolean mkdirs(String destPath) {

File file = new File(destPath);

// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)

if (!file.exists() && !file.isDirectory()) {

file.mkdirs();

return true;

}

return false;

}

/**

* @Title: encode

* @Description: 生成二维码

* @param content 二维码内容

* @param imgPath logo图片地址

* @param destPath 目标保存地址

* @param needCompress 是否压缩logo图片大小

* @throws Exception 参数说明

* @return void 返回类型

* @throws

*/

private static void encode(String content, String logoPath, String destPath, boolean needCompress) throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);

if (mkdirs(destPath)) {

String file = new Random().nextInt(99999999) + ".jpg";

ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));

}

}

/**

* @Title: encode

* @Description: 生成二维码

* @param content 二维码内容

* @param destPath 目标保存地址

* @throws Exception 参数说明

* @return void 返回类型

* @throws

*/

public static void encode(String content, String destPath) throws Exception {

QRCodeUtil.encode(content, null, destPath, false);

}

/**

* @Title: encode

* @Description: 生成二维码

* @param content 二维码内容

* @param imgPath logo图片地址

* @param output 输出流

* @param needCompress 是否压缩logo图片大小

* @throws Exception 参数说明

* @return void 返回类型

* @throws

*/

public static void encode(String content, String logoPath, OutputStream output, boolean needCompress) throws Exception {

BufferedImage image = QRCodeUtil.createImage(content, logoPath, needCompress);

ImageIO.write(image, FORMAT_NAME, output);

}

/**

* @Title: encode

* @Description: 生成二维码

* @param content 二维码内容

* @param output 输出流

* @throws Exception 参数说明

* @return void 返回类型

* @throws

*/

public static void encode(String content, OutputStream output) throws Exception {

QRCodeUtil.encode(content, null, output, false);

}

/**

* @Title: decode

* @Description: 对二维码解码

* @param file 文件对象

* @return 解码后的二维码内容字符串

* @ZtroEthrows Exception 参数说明

* @return String 返回类型

* @throws

*/

private static String decode(File file) throws Exception {

BufferedImage image;

image = ImageIO.read(file);

if (image == null) {

return null;

}

BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);

BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));

Hashtable hints = new Hashtable();

hints.put(DecodeHintType.CHARACTER_SET, CHARSET);

return new MultiFormatReader().decode(bitmap, hints).getText();

}

/**

* @Title: decode

* @Description: 对二维码解码

* @param path 文件路径

* @return

* @throws Exception 参数说明

* @return String 返回类型

* @throws

*/

public static String decode(String path) throws Exception {

return QRCodeUtil.decode(new File(path));

}

}

QRCodeServlet.java

package com.webos.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.webos.util.QRCodeUtil;

/*

* Servlet implementation class QRCodeServlet

*/

@WebServlet("/QRCodeServlet")

public class QRCodeServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/*

* @see HttpServlet#HttpServlet()

*/

public QRCodeServlet() {

super();

}

/*

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

* response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

try {

String text = "http://baidu.com?timestamp=" + System.currentTimeMillis();

QRCodeUtil.encode(text, response.getOutputStream());

} catch (Exception e) {

e.printStackTrace();

}

}

/*

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

* response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

}

}

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