package com.laning.qrcode;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;

import javax.imageio.ImageIO;

import com.google.zxing.Binarizer;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;

public class ReaderQRCode {

	public static void main(String[] args) {	
		File dstqrcode = new File("E:/大一課程/java程式設計/JAVA生成二維碼jar包/2.png");
		try {
			readQRCode(dstqrcode);
		} catch (NotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
	
	/**
	 * 1 讀取圖片
	 * 2轉化為亮度資料來源
	 * 3使用轉換器把亮度資料來源轉換為二進位制位數
	 * 4再把二進位制位資料在換為二進位制點陣圖
	 * 5讀取內容
	 * @throws IOException 
	 * @throws NotFoundException 
	 */
	//讀取二維碼的工具方法
	private static void readQRCode(File dstqrcode) throws IOException, NotFoundException{
		//1 讀取圖片
		BufferedImage img = ImageIO.read(dstqrcode);
		//2轉化為亮度資料來源  LuminanceSource有四個實現類，可以去官網查
		LuminanceSource luminnanceSource = new BufferedImageLuminanceSource(img);
		//3使用轉換器把亮度資料來源轉換為二進位制位數
		Binarizer binarizer = new HybridBinarizer(luminnanceSource);
		//4再把二進位制位資料在換為二進位制點陣圖
		BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);
		//5讀取內容
		MultiFormatReader formatReader = new MultiFormatReader();
		HashMap<DecodeHintType,Object> hints = new HashMap<>();
		hints.put(DecodeHintType.CHARACTER_SET,"utf-8");
		Result decode = formatReader.decode(binaryBitmap, hints);
		System.out.println(decode.getText());
	}

}