二维码的生成

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近期做项目的时候,要求使用二维码生成。于是便整理了一下代码,以便以后查阅。


我使用的是google的ZXing生成二维码。

因为使用了maven构造的项目,所以首先要在pom.xml中配置一下:

<dependency>   <groupId>com.google.zxing</groupId>      <artifactId>core</artifactId>      <version>3.2.1</version>  </dependency>

辅助类(google提供 复制即用):

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;/** * @author Administrator * */public final class MatrixToImageWriter {  private static final int BLACK = 0xFF000000;  private static final int WHITE = 0xFFFFFFFF;  private MatrixToImageWriter() {}   /** * @param matrix * @return */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;  }   /** * @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);    }  }   /** * @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);    }  }}



操作类(自己改的。。在实际中根据具体情况写):

import java.util.HashMap;import java.util.Map;import javax.servlet.http.HttpServletResponse;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.common.BitMatrix;/** * 实现二维码输出 * * @author Administrator * */public class ZxingCode { /**  * 输出二维码到web  *  * @param str  *            需要显示的文本  * @param response  */ public static void code(String str, HttpServletResponse response) {  MultiFormatWriter multiFormatWriter = new MultiFormatWriter();  Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();  hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");  try {   BitMatrix bitMatrix = multiFormatWriter.encode(str, BarcodeFormat.QR_CODE, 200, 200, hints);   MatrixToImageWriter.writeToStream(bitMatrix, "jpg", response.getOutputStream());  } catch (Exception e) {   e.printStackTrace();  } }}

这里用到的仅仅是str封装的文本信息,其余的都是固定代码。200,200为宽高。

MatrixToImageWriter.writeToStream用数据流输出到页面
MatrixToImageWriter.writeToFile以图片的格式写入文件

网上还有解析二维码的操作。日后有时间,在总结一下。

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