二维码生成和解析

package com.sp.util;

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
     */
    public static void encode(String contents, int width, int height, String imgPath,String path) {
    //判断文件夹是否存在
    File uploadDir = new File(path);
if (!uploadDir.isDirectory()) {
uploadDir.mkdirs();
}
        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, "GBK");
        try {
            BitMatrix bitMatrix = new MultiFormatWriter().encode(contents,
                    BarcodeFormat.QR_CODE, width, height, hints);

            MatrixToImageWriter.writeToStream(bitMatrix, "png",new FileOutputStream(imgPath));

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


    /**
     * 解析二维码
     *
     * @param imgPath
     * @return
     */
    public static 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));

            Map<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
            hints.put(DecodeHintType.CHARACTER_SET, "GBK");

            result = new MultiFormatReader().decode(bitmap, hints);
            return result.getText();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    public static void main(String[] args) {
    String contents ="http://baidu.com";
    String imgPath = "E:/500005G.png";
    //encode(contents, 800, 800, imgPath,"E:/");
    System.out.println("解析结果=="+decode("E:/500005G.png"));
}

}