java生成二维码

采用java生成二维码
需要下载google的zxing-core.jar包。

package com.qrcode;

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;
/**
 * 用于生成图片帮助类
 */
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;
	}

	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);
		}
	}

	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);
		}
	}

}

package com.qrcode;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

/**
 * 二维码图片
 */
public class CreateQrImage {
	/**
	 * 生成二维码图片(用于Web工程)
	 * @param content 二维码内容
	 * @param fileName 生成图片名称
	 * @param outputFile 文件名
	 */
	public static void createWebQrcodeImage(String content, String fileName, String outputFile) {
		try {
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			BitMatrix bitMatrix = multiFormatWriter.encode(content,
					BarcodeFormat.QR_CODE, 200, 200, hints);
			String path = getWebImagePath() + outputFile;
			File file = new File(path);
			if (!file.exists()) {
				file.mkdirs();
			}
			File fileImage = new File(path, fileName + ".gif");
			MatrixToImageWriter.writeToFile(bitMatrix, "gif", fileImage);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 生成二维码图片(java工程测试)
	 * @param content 二维码内容
	 * @param fileName 生成图片名称
	 * @param outputFile 文件名(例如：c:\java)
	 */
	public static void createBaseQrcodeImage(String content, String imageName, String outputFilePath) {
		try {
			MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
			Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
			hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
			BitMatrix bitMatrix = multiFormatWriter.encode(content,
					BarcodeFormat.QR_CODE, 200, 200, hints);
			String path = outputFilePath;
			File file = new File(path);
			if (!file.exists()) {
				file.mkdirs();
			}
			File fileImage = new File(path, imageName + ".gif");
			MatrixToImageWriter.writeToFile(bitMatrix, "gif", fileImage);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 删除二维码图片(用于Web工程)
	 * @param fileName 图片名称
	 * @param outputFile 文件名称
	 */
	public static void webDeleteImage(String fileName, String outputFile) {
		try {
			File fileImage = new File(getWebImagePath() + outputFile, fileName + ".gif");
			if (fileImage.exists()) {
				fileImage.delete();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 删除二维码图片(java工程测试)
	 * @param fileName 图片名称
	 * @param outputFile 文件名(例如：c:\java)
	 */
	public static void baseDeleteImage(String fileName, String outputFilePath) {
		try {
			File fileImage = new File(outputFilePath, fileName + ".gif");
			if (fileImage.exists()) {
				fileImage.delete();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 图片路径(用于Web工程)
	 */
	public static String getWebImagePath(){
		StringBuffer msg = new StringBuffer();
		String path = CreateQrImage.class.getProtectionDomain().getCodeSource().getLocation().getFile();
		try {
			path = new File(path).getCanonicalPath();
		} catch (IOException e) {
			e.printStackTrace();
		}
		int pos = path.lastIndexOf("WEB-INF");
		if (pos >= 0) {
			path = path.substring(0, pos);
			msg.setLength(0);
			msg.append(path);
		}
		return msg.toString();
	}
	
	public static void main(String[] args){
		//调用java工程自测,先生成二维码图片在C:/createQrcode盘符下
		CreateQrImage.createBaseQrcodeImage("java生成二维码", "二维码", "C:/createQrcode");
		//使用线程等待10s后,再将生成的二维码图片删除
		try{   
			Thread.sleep(20000);//等待20秒
		}catch(Exception e){
			e.printStackTrace(System.out);
		}
		//删除生成的二维码图片
		CreateQrImage.baseDeleteImage("二维码", "C:/createQrcode");
	}
}