java在本地生成并解析二维码的两种方式

1.利用swetakeQrcode生成并解析二维码

这个是日本人写的，生成的是我们常见的方形的二维码 

首先导入相应的jar包，QRCode包，创建和读取的代码如下

	public String SwetakeQRCode(String content,int size) {
				// TODO Auto-generated method stub
				//定义二维码图片名称
				String qrName="QRcode_Local_"+System.currentTimeMillis()/1000+".jpg";
				//Qrcode是swetake的封装对象
				Qrcode testQrcode = new Qrcode();
				// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
				testQrcode.setQrcodeErrorCorrect('M');
				testQrcode.setQrcodeEncodeMode('B');
				// 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
				testQrcode.setQrcodeVersion(size);
				
				// 图片尺寸
				int imgSize =67+12*(size-1);
				// 获得内容的字节数组，设置编码格式
				try {
					byte[] contentBytes = content.getBytes("utf-8");
					BufferedImage qrImg= new BufferedImage(imgSize, imgSize,BufferedImage.TYPE_INT_RGB);
					Graphics2D gs = qrImg.createGraphics();
					// 设置背景颜色
					gs.setBackground(Color.WHITE);
					gs.clearRect(0, 0, imgSize,imgSize);

					// 设定图像颜色> BLACK
					gs.setColor(Color.BLACK);
					
					// 设置偏移量，不设置可能导致解析出错
					int pixoff =2;
					//  二维码存储容量限制(0--800)
					if (contentBytes.length > 0 && contentBytes.length < 800) {
						boolean[][] codeOut =testQrcode.calQrcode(contentBytes);
						for (int i = 0; i < codeOut.length; i++) {
								for (int j = 0; j < codeOut.length; j++) {
									if (codeOut[j][i]) {
										gs.fillRect(j *3+ pixoff, i * 3+ pixoff, 3, 3);
									}
								}
					     }
					}else {
							throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
					}
					gs.dispose();
					qrImg.flush();
					
					//存储图片
				//String LocalUrl=ParamManagerImpl.get(SysParam.SYS_WEIXIN_QRCODE_PATH)+qrName;
				String LocalUrl="C:/111/"+qrName;
					File f = new File(LocalUrl);
					if (!f.exists()){
						f.createNewFile();
						ImageIO.write(qrImg, "jpg", f);
					}
				} catch (UnsupportedEncodingException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				return ParamManagerImpl.get(SysParam.SYS_WEIXIN_QRCODE_BUCKET)+qrName;
			}

			
			@Override
			public String DecoderLocalQRCode(String imgPath) {
				// TODO Auto-generated method stub
				// QRCode 二维码图片的文件
				File imageFile = new File(imgPath);
				BufferedImage bufImg = null;
				String content = null;
				try {
					bufImg = ImageIO.read(imageFile);
					QRCodeDecoder decoder = new QRCodeDecoder();
					//读取本地二维码内容
					content = new String(decoder.decode(new LocalQRCodeImage(bufImg)), "utf-8"); 
					HttpPost post = new HttpPost(content);
				} catch (IOException e) {
					System.out.println("Error: " + e.getMessage());
					e.printStackTrace();
				} catch (DecodingFailedException dfe) {
					System.out.println("Error: " + dfe.getMessage());
					dfe.printStackTrace();
				}
				return content;
			}

package com.fz.apps.weixin.model;

import java.awt.image.BufferedImage;

import jp.sourceforge.qrcode.data.QRCodeImage;

public class LocalQRCodeImage implements QRCodeImage {

	BufferedImage bufImg;
	
	public LocalQRCodeImage(BufferedImage bufImg) {
		this.bufImg = bufImg;
	}
	
	@Override
	public int getHeight() {
		return bufImg.getHeight();
	}

	@Override
	public int getPixel(int x, int y) {
		return bufImg.getRGB(x, y);
	}

	@Override
	public int getWidth() {
		return bufImg.getWidth();
	}

}

2，利用Zxing生成并解析二维码

Zxing是Google提供的关于条码（一维码、二维码）的解析工具，提供了二维码的生成与解析的方法，现在我简单介绍一下使用Java利用Zxing生成与解析二维码

导入Zxing包，创建和读取的代码如下：

public String SwetakeQRCode(String content,int size) {

      	int width = 100;
		int height = 100;
		// 二维码的图片格式
		String format = "jpg";
		Hashtable hints = new Hashtable();
		// 内容所使用编码
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
		BitMatrix bitMatrix = new MultiFormatWriter().encode(text,BarcodeFormat.QR_CODE, width, height, hints);
		// 生成二维码
		File outputFile = new File("C:/111/" + "new.jpg");
		ZxingUtil.writeToFile(bitMatrix, format, outputFile);
		//字符流输出
		ZxingUtil.writeToStream(bitMatrix, format, System.out);
}

public String DecoderQRCode(String imgPath) {
    
    try {
             MultiFormatReader formatReader = new MultiFormatReader();
             File file = new File(imgPath);
             BufferedImage image = ImageIO.read(file);;
             LuminanceSource source = new BufferedImageLuminanceSource(image);
             Binarizer  binarizer = new HybridBinarizer(source);
             BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
             Map hints = new HashMap();
             hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
             Result result = formatReader.decode(binaryBitmap,hints);
             
             System.out.println("result = "+ result.toString());
             System.out.println("resultFormat = "+ result.getBarcodeFormat());
             System.out.println("resultText = "+ result.getText());
                         
         } catch (Exception e) {
             e.printStackTrace();
         }

}