java 生成二维码小dome

具体的jar包就自行导入一下,这个小dome就是getUrl方法,传入内容,得到临时路径,至于得到file路径之后,

该oos就oos,该inputStream就走IO

package com.***.manage.util;

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

import javax.imageio.ImageIO;

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;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

public 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;
	}

	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);
		}
	}

	//生成二维码
	public static  String  getUrl(String  content){
		MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
		Map hints = new HashMap();
		//设置UTF-8， 防止中文乱码
		hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
		//设置二维码四周白色区域的大小
		hints.put(EncodeHintType.MARGIN, 2);
		//设置二维码的容错性
		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
		//画二维码，记得调用multiFormatWriter.encode()时最后要带上hints参数，不然上面设置无效
		BitMatrix bitMatrix = null;
		File temp = null;
		try {
			bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 400, 400, hints);
			File directory = new File("");//设定为当前文件夹
			String path =directory.getCanonicalPath();//临时路径
			temp = File.createTempFile(path+"\\code", ".jpg");
			MatrixToImageWriter.writeToFile(bitMatrix, "jpg", temp);

		} catch (WriterException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return temp.getPath();
	}

}