本例子使用google Zxing 实现。
Zxing库的主要部分支持以下几个功能：核心代码的使用、适用于J2SE客户端的版本、适用于Android客户端的版本（即BarcodeScanner）、Android的集成（通过Intent支持和BarcodeScanner的集成）等。
需要的jar
pom.xml增加如下引用：
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>com.google.zxing</groupId>
<artifactId>javase</artifactId>
<version>3.3.0</version>
</dependency>
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java代码部分：
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Hashtable;
import java.util.Map;
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.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
/**
* 二维码生成器
*
* @blog http://sjsky.iteye.com
* @author Michael
*/
public class ZxingHandler {
/**
* 生成二维码
*
* @param contents
* @param width
* @param height
* @param imgPath
* @throws Exception
*/
public static void encode(String contents, int width, int height, String imgPath) throws Exception {
Map<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
// 指定纠错等级
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
// 指定编码格式
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
BarcodeFormat.QR_CODE, width, height, hints);
MatrixToImageWriter.writeToStream(bitMatrix, "png",
new FileOutputStream(imgPath));
}
/**
* 解析二维码
*
* @param imgPath
* @return
* @throws Exception
*/
public static String decode(String imgPath) throws Exception {
BufferedImage image = null;
Result result = null;
image = ImageIO.read(new File(imgPath));
if (image == null) {
System.out.println("the decode image may be not exit.");
}
LuminanceSource source = new BufferedImageLuminanceSource(image);
BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
Map<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");
result = new MultiFormatReader().decode(bitmap, hints);
return result.getText();
}
public static void main(String[] args) throws Exception {
encode("http://blog.csdn.net/rishengcsdn",300,400,"D:/temp/test2.png");
System.out.println(decode("D:/temp/test2.png"));
}
}
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图片如下，用手机扫描就可以访问我的BLOG了，
