QRCode是日本人开发的ZXing是google开发的
QRCode开发需要包 http://download.csdn.net/detail/xiaokui_wingfly/7957815
ZXing开发需要包 http://download.csdn.net/detail/u010457960/5301392
QRCode方式
package cn.utils;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import javax.imageio.ImageIO;
import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;
import com.swetake.util.Qrcode;
public class QRCodeUtils {
/**
* 编码字符串内容到目标File对象中
*
* @param encodeddata 编码的内容
* @param destFile 生成file文件 1381090722 5029067275903
* @throws IOException
*/
public static void qrCodeEncode(String encodeddata, File destFile) throws IOException {
Qrcode qrcode = new Qrcode();
qrcode.setQrcodeErrorCorrect('M'); // 纠错级别（L 7%、M 15%、Q 25%、H 30%）和版本有关
qrcode.setQrcodeEncodeMode('B');
qrcode.setQrcodeVersion(7); // 设置Qrcode包的版本
byte[] d = encodeddata.getBytes("GBK"); // 字符集
BufferedImage bi = new BufferedImage(139, 139, BufferedImage.TYPE_INT_RGB);
// createGraphics // 创建图层
Graphics2D g = bi.createGraphics();
g.setBackground(Color.WHITE); // 设置背景颜色（白色）
g.clearRect(0, 0, 139, 139); // 矩形 X、Y、width、height
g.setColor(Color.BLACK); // 设置图像颜色（黑色）
if (d.length > 0 && d.length < 123) {
boolean[][] b = qrcode.calQrcode(d);
for (int i = 0; i < b.length; i++) {
for (int j = 0; j < b.length; j++) {
if (b[j][i]) {
g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
}
}
}
}
// Image img = ImageIO.read(new File("D:/tt.png")); logo
// g.drawImage(img, 25, 55,60,50, null);
g.dispose(); // 释放此图形的上下文以及它使用的所有系统资源。调用 dispose 之后，就不能再使用 Graphics 对象
bi.flush(); // 刷新此 Image 对象正在使用的所有可重构的资源
ImageIO.write(bi, "png", destFile);
System.out.println("Input Encoded data is：" + encodeddata);
}
/**
* 解析二维码，返回解析内容
*
* @param imageFile
* @return
*/
public static String qrCodeDecode(File imageFile) {
String decodedData = null;
QRCodeDecoder decoder = new QRCodeDecoder();
BufferedImage image = null;
try {
image = ImageIO.read(imageFile);
} catch (IOException e) {
System.out.println("Error: " + e.getMessage());
}
try {
decodedData = new String(decoder.decode(new J2SEImage(image)), "GBK");
System.out.println("Output Decoded Data is：" + decodedData);
} catch (DecodingFailedException dfe) {
System.out.println("Error: " + dfe.getMessage());
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return decodedData;
}
public static void main(String[] args) {
String FilePath = "d:/qrcode.png";
File qrFile = new File(FilePath);
// 二维码内容
String encodeddata = "Hello X-rapido";
try {
QRCodeUtils.qrCodeEncode(encodeddata, qrFile);
} catch (IOException e) {
e.printStackTrace();
}
// 解码
String reText = QRCodeUtils.qrCodeDecode(qrFile);
System.out.println(reText);
}
}
class J2SEImage implements QRCodeImage {
BufferedImage image;
public J2SEImage(BufferedImage image) {
this.image = image;
}
public int getWidth() {
return image.getWidth();
}
public int getHeight() {
return image.getHeight();
}
public int getPixel(int x, int y) {
return image.getRGB(x, y);
}
}
Zxing方式
package cn.utils.code;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import com.google.zxing.common.BitMatrix;
/**
* 二维码的生成需要借助MatrixToImageWriter类，该类是由Google提供的，可以将该类直接拷贝到源码中使用
*/
public class MatrixToImageWriter {
private static final int BLACK = 0xFF000000;
private static final int WHITE = 0xFFFFFFFF;
private MatrixToImageWriter() {
}
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;
}
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);
}
}
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);
}
}
}
编写main方法
package cn.utils.code;
import java.io.File;
import java.util.Hashtable;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
public class Main {
public static void main(String[] args) throws Exception {
String text = "NiuYueYue I Love You！"; // 二维码内容
int width = 300; // 二维码图片宽度
int height = 300; // 二维码图片高度
String format = "gif";// 二维码的图片格式
Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码
BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
// 生成二维码
File outputFile = new File("d:" + File.separator + "new.gif");
MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);
}
}
两种方式都可以进行创建二维码并解析，一般项目中很少使用自己写二维码，在网站上提供了很多在线二维码生成器，其中高级设计模式中有很多功能
