JAVA生成二维码

~java使用zxing生成二维码~

因此需要zxing的jar包~

 

package test;  
import com.google.zxing.common.BitMatrix;  

import javax.imageio.ImageIO;  
import java.io.File;  
import java.io.OutputStream;  
import java.io.IOException;  
import java.awt.image.BufferedImage;  

public final class MatrixToImageWriter {  
	
	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;
	
	private MatrixToImageWriter() {}  
	
	public static BufferedImage toBufferedImage(BitMatrix matrix) {  
		int width = matrix.getWidth();  
		int height = matrix.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, matrix.get(x, y) ? BLACK : WHITE);  
			}  
		}  
		return image;  
	}  
	
	/**
	 * 返回图片文件
	 * @param matrix
	 * @param format
	 * @param file
	 * @throws IOException
	 */
	public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {  
		BufferedImage image = toBufferedImage(matrix);  
		if (!ImageIO.write(image, format, file)) {  
			throw new IOException("Could not write an image of format " + format + " to " + file);  
		}  
	}  
	
	/**
	 * 返回图片流
	 * @param matrix
	 * @param format
	 * @param stream
	 * @throws IOException
	 */
	public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {  
		BufferedImage image = toBufferedImage(matrix);  
		if (!ImageIO.write(image, format, stream)) {  
			throw new IOException("Could not write an image of format " + format);  
		}  
	}  
	
}  

 其实就是利用BitMatrix构造一个图片~输出文件或者流~，测试~

 

 

package test;  
  
import java.io.File;  
import java.io.IOException;
import java.util.Hashtable;  
  
import com.google.zxing.BarcodeFormat;  
import com.google.zxing.EncodeHintType;  
import com.google.zxing.MultiFormatWriter;  
import com.google.zxing.WriterException;  
import com.google.zxing.common.BitMatrix;  
  
public class MatrixTest {  
  
    public static void main(String[] args) throws WriterException, IOException {  
        String text = "https://cn.jarfire.org/";  
        int width = 500;  
        int height = 500;  
        //二维码的图片格式  
        String format = "gif";  
        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:"+File.separator+"Users\\Administrator\\Desktop"+File.separator+"code.gif");  
        
        MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);  
  
    }  
  
}  

File.separator→就是文件夹之间的分割符，等同于“\\”貌似最好还是用File.separator，懒的话还是用“\\”~

（顺带提一下→https://cn.jarfire.org/←这网站有很多jar包提供下载ლ(╹◡╹ლ)