package com.yihaomen.barcode;

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

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.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

/**
 * 二維碼工具類
 * 
 */
public class QRCodeUtil {

 private static final String CHARSET = "utf-8";
 private static final String FORMAT_NAME = "JPG";
 // 二維碼尺寸
 private static final int QRCODE_SIZE = 300;
 // LOGO寬度
 private static final int WIDTH = 60;
 // LOGO高度
 private static final int HEIGHT = 60;

 private static BufferedImage createImage(String content, String imgPath,
  boolean needCompress) throws Exception {
 Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
 hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
 hints.put(EncodeHintType.MARGIN, 1);
 BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
  BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
 int width = bitMatrix.getWidth();
 int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000
   : 0xFFFFFFFF);
  }
 }
 if (imgPath == null || "".equals(imgPath)) {
  return image;
 }
 // 插入圖片
 QRCodeUtil.insertImage(image, imgPath, needCompress);
 return image;
 }

 /**
 * 插入LOGO
 * 
 * @param source
 *  二維碼圖片
 * @param imgPath
 *  LOGO圖片地址
 * @param needCompress
 *  是否壓縮
 * @throws Exception
 */
 private static void insertImage(BufferedImage source, String imgPath,
  boolean needCompress) throws Exception {
 File file = new File(imgPath);
 if (!file.exists()) {
  System.err.println(""+imgPath+" 該文件不存在！");
  return;
 }
 Image src = ImageIO.read(new File(imgPath));
 int width = src.getWidth(null);
 int height = src.getHeight(null);
 if (needCompress) { // 壓縮LOGO
  if (width > WIDTH) {
  width = WIDTH;
  }
  if (height > HEIGHT) {
  height = HEIGHT;
  }
  Image image = src.getScaledInstance(width, height,
   Image.SCALE_SMOOTH);
  BufferedImage tag = new BufferedImage(width, height,
   BufferedImage.TYPE_INT_RGB);
  Graphics g = tag.getGraphics();
  g.drawImage(image, 0, 0, null); // 繪制縮小后的圖
  g.dispose();
  src = image;
 }
 // 插入LOGO
 Graphics2D graph = source.createGraphics();
 int x = (QRCODE_SIZE - width) / 2;
 int y = (QRCODE_SIZE - height) / 2;
 graph.drawImage(src, x, y, width, height, null);
 Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
 graph.setStroke(new BasicStroke(3f));
 graph.draw(shape);
 graph.dispose();
 }

 /**
 * 生成二維碼(內嵌LOGO)
 * 
 * @param content
 *  內容
 * @param imgPath
 *  LOGO地址
 * @param destPath
 *  存放目錄
 * @param needCompress
 *  是否壓縮LOGO
 * @throws Exception
 */
 public static void encode(String content, String imgPath, String destPath,
  boolean needCompress) throws Exception {
 BufferedImage image = QRCodeUtil.createImage(content, imgPath,
  needCompress);
 mkdirs(destPath);
 String file = new Random().nextInt(99999999)+".jpg";
 ImageIO.write(image, FORMAT_NAME, new File(destPath+"/"+file));
 }

 /**
 * 當文件夾不存在時，mkdirs會自動創建多層目錄，區別于mkdir．(mkdir如果父目錄不存在則會拋出異常)
 * @author lanyuan
 * Email: mmm333zzz520@163.com
 * @date 2013-12-11 上午10:16:36
 * @param destPath 存放目錄
 */
 public static void mkdirs(String destPath) {
 File file =new File(destPath); 
 //當文件夾不存在時，mkdirs會自動創建多層目錄，區別于mkdir．(mkdir如果父目錄不存在則會拋出異常)
 if (!file.exists() && !file.isDirectory()) {
  file.mkdirs();
 }
 }

 /**
 * 生成二維碼(內嵌LOGO)
 * 
 * @param content
 *  內容
 * @param imgPath
 *  LOGO地址
 * @param destPath
 *  存儲地址
 * @throws Exception
 */
 public static void encode(String content, String imgPath, String destPath)
  throws Exception {
 QRCodeUtil.encode(content, imgPath, destPath, false);
 }

 /**
 * 生成二維碼
 * 
 * @param content
 *  內容
 * @param destPath
 *  存儲地址
 * @param needCompress
 *  是否壓縮LOGO
 * @throws Exception
 */
 public static void encode(String content, String destPath,
  boolean needCompress) throws Exception {
 QRCodeUtil.encode(content, null, destPath, needCompress);
 }

 /**
 * 生成二維碼
 * 
 * @param content
 *  內容
 * @param destPath
 *  存儲地址
 * @throws Exception
 */
 public static void encode(String content, String destPath) throws Exception {
 QRCodeUtil.encode(content, null, destPath, false);
 }

 /**
 * 生成二維碼(內嵌LOGO)
 * 
 * @param content
 *  內容
 * @param imgPath
 *  LOGO地址
 * @param output
 *  輸出流
 * @param needCompress
 *  是否壓縮LOGO
 * @throws Exception
 */
 public static void encode(String content, String imgPath,
  OutputStream output, boolean needCompress) throws Exception {
 BufferedImage image = QRCodeUtil.createImage(content, imgPath,
  needCompress);
 ImageIO.write(image, FORMAT_NAME, output);
 }

 /**
 * 生成二維碼
 * 
 * @param content
 *  內容
 * @param output
 *  輸出流
 * @throws Exception
 */
 public static void encode(String content, OutputStream output)
  throws Exception {
 QRCodeUtil.encode(content, null, output, false);
 }

 /**
 * 解析二維碼
 * 
 * @param file
 *  二維碼圖片
 * @return
 * @throws Exception
 */
 public static String decode(File file) throws Exception {
 BufferedImage image;
 image = ImageIO.read(file);
 if (image == null) {
  return null;
 }
 BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(
  image);
 BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
 Result result;
 Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
 hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
 result = new MultiFormatReader().decode(bitmap, hints);
 String resultStr = result.getText();
 return resultStr;
 }

 /**
 * 解析二維碼
 * 
 * @param path
 *  二維碼圖片地址
 * @return
 * @throws Exception
 */
 public static String decode(String path) throws Exception {
 return QRCodeUtil.decode(new File(path));
 }

 public static void main(String[] args) throws Exception {
 String text = "http://www.yihaomen.com";
 QRCodeUtil.encode(text, "c:/me.jpg", "c:/barcode", true);
 }
}