java 二维码 生成和解析 (中间:图片、文字;底部:文字)
一、准备工作下载QR二维码包。首先得下载zxing.jar 包, 我这里用的是3.3版本的core包下载地址:现在已经迁移到了github:https://github.com/zxing/zxing/wiki/Getting-Started-Developing,当然你也可以从maven仓库下载jar包:http://central.maven.org/maven2/com/
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一、准备工作
下载QR二维码包。
首先得下载zxing.jar 包, 我这里用的是3.3版本的core包
下载地址:现在已经迁移到了github:https://github.com/zxing/zxing/wiki/Getting-Started-Developing,
当然你也可以从maven仓库下载jar包:http://central.maven.org/maven2/com/google/zxing/core/
二、代码
part1:
import com.google.zxing.LuminanceSource;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
/**
*
* @author yuki_ho
* 辅助类
*/
public final 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;
}
// 这里要得到指定行的像素数据
@Override
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;
}
// 返回我们生成好的像素数据
@Override
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;
}
@Override
public boolean isCropSupported() {
return true;
}
@Override
public LuminanceSource crop(int left, int top, int width, int height) {
return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);
}
@Override
public boolean isRotateSupported() {
return true;
}
@Override
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);
}
}
part2:
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.IOException;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.UUID;
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.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码 生成、解析器 帮助类
* @author yuki_ho
*
*/
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;
/**
* 检查路径 图片是否存在
* @param imgPath
* @return
* @throws IOException
*/
private static BufferedImage CheckImageExist(String imgPath) throws IOException{
File file = new File(imgPath);
if (!file.exists()) {
System.err.println(""+imgPath+" 该文件不存在！");
return null;
}
BufferedImage src = ImageIO.read(new File(imgPath));
return src;
}
/**
* 创建 二维码所需图片
* @param content 内容
* @param imgPath Logo图片地址
* @param needCompress 是否压缩Logo大小
* @param needDescription 是否需要底部描述
* @return
* @throws Exception
*/
private static BufferedImage createImage(String content,BufferedImage logoImage, String bottomDes,
boolean needCompress) throws Exception {
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //容错级别 H->30%
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();
int tempHeight = height;
boolean needDescription=(null==bottomDes&&"".equals(bottomDes));
if (needDescription) {
tempHeight += 30;
}
BufferedImage image = new BufferedImage(width, tempHeight,
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(null==logoImage)
return image;
// 插入图片
QRCodeUtil.insertImage(image, logoImage, needCompress);
if(needDescription)
return image;
QRCodeUtil.addFontImage(image, bottomDes);
return image;
}
/**
* 添加 底部图片文字
* @param source 图片源
* @param declareText 文字本文
*/
private static void addFontImage(BufferedImage source, String declareText) {
BufferedImage textImage = FontImage.getImage(declareText, QRCODE_SIZE, 50);
Graphics2D graph = source.createGraphics();
int width = textImage.getWidth(null);
int height = textImage.getHeight(null);
Image src =textImage;
graph.drawImage(src, 0, QRCODE_SIZE - 20, width, height, null);
graph.dispose();
}
/**
* 插入Logo图片
* @param source 图片操作对象
* @param imgPath Logo图片地址
* @param needCompress 是否压缩Logo大小
* @throws Exception
*/
private static void insertImage(BufferedImage source,BufferedImage logoImage,
boolean needCompress) throws Exception {
int width = logoImage.getWidth(null);
int height = logoImage.getHeight(null);
Image src =logoImage;
if (needCompress) {
if (width > WIDTH) {
width = WIDTH;
}
if (height > HEIGHT) {
height = HEIGHT;
}
Image image = logoImage.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);
g.dispose();
src = image;
}
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();
}
/**
* 创建 目录
* @param destPath
*/
public static void 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();
}
}
/**
* 生成二维码 (以Logo路径)
* @param content 内容 (若带http:// 会自动跳转)
* @param imgPath Logo 图片地址
* @param destPath 保存二维码 地址 (没有该目录会自动创建)
* @param bottomDes 底部文字描述
* @param needCompress 是否压缩Logo大小
* @throws Exception
*/
public static void encodeOfPath(String content, String imgPath,String bottomDes,String destPath,
boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, CheckImageExist(imgPath),
bottomDes,needCompress);
mkdirs(destPath);
String file = UUID.randomUUID().toString()+".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
}
/**
*
* @param content 内容
* @param logoImage 图片源 LOGO
* @param bottomDes 底部描述文字
* @param destPath 保存二维码 地址 (没有该目录会自动创建)
* @param needCompress 是否压缩logo
* @throws Exception
*/
public static void encode(String content, BufferedImage logoImage,String bottomDes, String destPath,
boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, logoImage, bottomDes,
needCompress);
mkdirs(destPath);
String file = UUID.randomUUID().toString()+".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
}
/**
*
* @param content 内容
* @param logoImage 图片源LOGO
* @param bottomDes 底部描述文字
* @param picName 图片名
* @param destPath 保存二维码 地址 (没有该目录会自动创建)
* @param needCompress 是否压缩logo
* @throws Exception
*/
public static void encode(String content, BufferedImage logoImage,String bottomDes,String picName,String destPath,
boolean needCompress) throws Exception {
BufferedImage image=QRCodeUtil.createImage(content, logoImage,bottomDes,
needCompress);
mkdirs(destPath);
String file = picName+".jpg";
ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
}
/**
*
* @param content 内容
* @param destPath 保存二维码 地址 (没有该目录会自动创建)
* @throws Exception
*/
public static void encode(String content, String destPath) throws Exception {
QRCodeUtil.encode(content, null,null,destPath, false);
}
/**
*
* @param content 内容
* @param imgPath 图片源地址LOGO
* @param bottomDes 底部描述文字
* @param output 输出流
* @param needCompress 是否压缩logo
* @throws Exception
*/
public static void encodeOfPath(String content, String imgPath,String bottomDes,
OutputStream output, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, CheckImageExist(imgPath), bottomDes,
needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
*
* @param content 内容
* @param Image 图片源LOGO
* @param bottomDes 底部描述文字
* @param output 输出流
* @param needCompress 是否压缩
* @throws Exception
*/
public static void encode(String content, BufferedImage Image,String bottomDes,
OutputStream output, boolean needCompress) throws Exception {
BufferedImage image = QRCodeUtil.createImage(content, Image, bottomDes,
needCompress);
ImageIO.write(image, FORMAT_NAME, output);
}
/**
*
* @param content 内容
* @param output 输出流
* @throws Exception
*/
public static void encode(String content, OutputStream output)
throws Exception {
QRCodeUtil.encode(content, null,null, output, false);
}
/**
* 解析 二维码
* @param file 图片文件
* @return
* @throws Exception
*/
public 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));
Result result;
Hashtable hints = new Hashtable();
hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
result = new MultiFormatReader().decode(bitmap, hints);
String resultStr = result.getText();
return resultStr;
}
/**
* 解析二维码
* @param path 图片地址
* @return
* @throws Exception
*/
public static String decode(String path) throws Exception {
return QRCodeUtil.decode(new File(path));
}
public static void main(String[] args) throws Exception {
String text = "http://www.baidu.com";
// QRCodeUtil.encodeOfPath(text, "d:/test/a1.jpg",null,"d:/test", true);
// QRCodeUtil.encode(text,"d:/test"); // 不带logo
BufferedImage bi = ImageIO.read(new File("d:/test/a1.jpg"));
QRCodeUtil.encode(text,bi,"ok","123","d:/test", true);
}
}
三、调用测试
如果要 中间写文字可以参考:地址
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