QRcodeUtil.java二维码工具类（生成+解析）
QRcodeUtil.java二维码工具类（生成+解析）
JavaWeb工具类目录 [http://baike.xsoftlab.net/view/1059.html](http://baike.xsoftlab.net/view/1059.html)
此工具类需要引入一个jar包：[zxing-core-3.3.0.jar](http://central.maven.org/maven2/com/google/zxing/core/3.3.0/core-3.3.0.jar)
代码
```
package com.zhenzhigu.commons.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.AffineTransform;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
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.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
*
* @author Master.Xia v1.0 date:2013年06月12日13:32:18
* @author Master.Xia v2.0 date:2017年04月06日23:46:11
*/
public class QRcodeUtil {
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 300;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;
/** 生成二维码 */
private static BufferedImage createImage(String content,InputStream logo)throws Exception {
Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
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);
}
}
// 插入图片
QRcodeUtil.insertImage(image, logo, true);
return image;
}
/** 在二维码中间插入logo图片 */
private static void insertImage(BufferedImage source, InputStream logo, boolean needCompress)throws Exception {
if(logo==null)return;
Image src = ImageIO.read(logo);
int width = src.getWidth(null);
int height = src.getHeight(null);
if (needCompress) { // 压缩LOGO
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = 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();
}
/**
* 生成二维码
* @param content 文本内容
* @param logo 内嵌图标
* @param output 输出流
* @throws Exception
*/
public static void encode(String content, InputStream logo, OutputStream output) throws Exception {
BufferedImage image = QRcodeUtil.createImage(content, logo);
ImageIO.write(image, FORMAT_NAME, output);
}
public static void encode(String content, InputStream logo, File out)throws Exception {
if(!out.getParentFile().exists()){
out.getParentFile().mkdirs();
}
out.createNewFile();
QRcodeUtil.encode(content, logo, new FileOutputStream(out));
}
public static void encode(String content, File logo, OutputStream out)throws Exception {
if(logo.exists()){
QRcodeUtil.encode(content, new FileInputStream(logo), out);
}else{
QRcodeUtil.encode(content,(InputStream)null, out);
}
}
public static void encode(String content, File logo, File out)throws Exception {
if(!out.getParentFile().exists()){
out.getParentFile().mkdirs();
}
out.createNewFile();
if(logo.exists()){
QRcodeUtil.encode(content, new FileInputStream(logo), out);
}else{
QRcodeUtil.encode(content,(InputStream)null, out);
}
}
public static void encode(String content, InputStream logo, String out)throws Exception {
QRcodeUtil.encode(content, logo, new File(out));
}
public static void encode(String content, String logo, String out) throws Exception {
QRcodeUtil.encode(content, new File(logo), new File(out));
}
public static void encode(String content, OutputStream out) throws Exception {
QRcodeUtil.encode(content, (InputStream)null, out);
}
public static void encode(String content, String out)throws Exception {
QRcodeUtil.encode(content,(InputStream)null, new File(out));
}
/**
* 解析二维码,input是二维码图片流
*/
public static String decode(InputStream input) throws Exception {
BufferedImage image = ImageIO.read(input);
if (image == null) {
return null;
}
BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Result result;
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
/**
* 解析二维码,file是二维码图片
*/
public static String decode(File file) throws Exception{
return decode(new FileInputStream(file));
}
/**
* 解析二维码,path是二维码图片路径
*/
public static String decode(String path) throws Exception {
return QRcodeUtil.decode(new File(path));
}
public static void main(String[] args) throws Exception {
QRcodeUtil.encode("http://baike.xsoftlab.net/view/1114.html","", "D:/abc/qr/1.jpg");
String data = QRcodeUtil.decode("D:/abc/qr/1.jpg");
System.out.println(data);
}
private static 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 &##124;&##124; 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 &##124;&##124; y >= getHeight()) {
throw new IllegalArgumentException("Requested row is outside the image: " + y);
}
int width = getWidth();
if (row == null &##124;&##124; 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 sourceHeight = 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);
}
}
}
```
使用说明：
QRcodeUtil.encode可以用字符串生成二维码
QRcodeUtil.decode用于将包含二维码的图片解析为字符串