import java.awt.image.BufferedImage;
import java.io.File;
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.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;

public class QRGenernate {

	public void Encode(String contents, int width, int height, String imgPath) {
		Hashtable<Object, Object> hints = new Hashtable<Object, Object>();

		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
		hints.put(EncodeHintType.CHARACTER_SET, "GBK");
		try {
			BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
					BarcodeFormat.QR_CODE, width, height, hints);

			MatrixToImageWriter
					.writeToFile(bitMatrix, "png", new File(imgPath));

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public String Decode(String imgPath) {
		BufferedImage image = null;
		Result result = null;
		try {
			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));

			Hashtable<Object, Object> hints = new Hashtable<Object, Object>();
			hints.put(DecodeHintType.CHARACTER_SET, "GBK");
			result = new MultiFormatReader().decode(bitmap, hints);
			return result.getText();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}

	public enum WifiCipherType {
		WIFICIPHER_WEP, WIFICIPHER_WPA, WIFICIPHER_NOPASS, WIFICIPHER_INVALID
	}

	public static void main(String args[]) {
		//fileName
		String imgPath = "result.png";

		String contents = "测试abc";
		int width = 300, height = 300;
		QRGenernate handler = new QRGenernate();
		//create pic
		handler.Encode(contents, width, height, imgPath);

		System.out.println("SUCCESS to generate QRcode");
		
		//analysis pic，get data
		String result = handler.Decode("result.png");
		System.out.println(result);
	}
}