Java利用Zxing生成二维码的简单实例

zxing是google提供的关于条码（一维码、二维码）的解析工具，提供了二维码的生成与解析的方法，现在我简单介绍一下使用java利用zxing生成与解析二维码

1、二维码的生成

1.1 将zxing-core.jar 包加入到classpath下。

1.2 二维码的生成需要借助matrixtoimagewriter类，该类是由google提供的，可以将该类拷贝到源码中，这里我将该类的源码贴上，可以直接使用。

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;
 
 
 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);
   }
  }
 
 }

1.3 编写生成二维码的实现代码

try {
       
   string content = "120605181003;http://www.cnblogs.com/jtmjx";
   string path = "c:/users/administrator/desktop/testimage";
   
   multiformatwriter multiformatwriter = new multiformatwriter();
   
   map hints = new hashmap();
   hints.put(encodehinttype.character_set, "utf-8");
   bitmatrix bitmatrix = multiformatwriter.encode(content, barcodeformat.qr_code, 400, 400,hints);
   file file1 = new file(path,"餐巾纸.jpg");
   matrixtoimagewriter.writetofile(bitmatrix, "jpg", file1);
   
 } catch (exception e) {
   e.printstacktrace();
 }

现在运行后即可生成一张二维码图片，是不是很简单啊？ 接下来我们看看如何解析二维码

2、二维码的解析

2.1 将zxing-core.jar 包加入到classpath下。　　

2.2 和生成一样，我们需要一个辅助类（ bufferedimageluminancesource），同样该类google也提供了，这里我同样将该类的源码贴出来，可以直接拷贝使用个，省去查找的麻烦

bufferedimageluminancesource 
 import com.google.zxing.luminancesource;
 
 import java.awt.graphics2d;
 import java.awt.geom.affinetransform;
 import java.awt.image.bufferedimage;
 
 public final class bufferedimageluminancesource extends luminancesource {
 
  private final bufferedimage image;
  private final int left;
  private final int top;
 
  public bufferedimageluminancesource(bufferedimage image) {
   this(image, 0, 0, image.getwidth(), image.getheight());
  }
 
  public bufferedimageluminancesource(bufferedimage image, int left, int top, int width, int height) {
   super(width, height);
 
   int sourcewidth = image.getwidth();
   int sourceheight = image.getheight();
   if (left + width > sourcewidth || top + height > sourceheight) {
    throw new illegalargumentexception("crop rectangle does not fit within image data.");
   }
 
   for (int y = top; y < top + height; y++) {
    for (int x = left; x < left + width; x++) {
     if ((image.getrgb(x, y) & 0xff000000) == 0) {
      image.setrgb(x, y, 0xffffffff); // = white
     }
    }
   }
 
   this.image = new bufferedimage(sourcewidth, sourceheight, bufferedimage.type_byte_gray);
   this.image.getgraphics().drawimage(image, 0, 0, null);
   this.left = left;
   this.top = top;
  }
 
  @override
  public byte[] getrow(int y, byte[] row) {
   if (y < 0 || y >= getheight()) {
    throw new illegalargumentexception("requested row is outside the image: " + y);
   }
   int width = getwidth();
   if (row == null || row.length < width) {
    row = new byte[width];
   }
   image.getraster().getdataelements(left, top + y, width, 1, row);
   return row;
  }
 
  @override
  public byte[] getmatrix() {
   int width = getwidth();
   int height = getheight();
   int area = width * height;
   byte[] matrix = new byte[area];
   image.getraster().getdataelements(left, top, width, height, matrix);
   return matrix;
  }
 
  @override
  public boolean iscropsupported() {
   return true;
  }
 
  @override
  public luminancesource crop(int left, int top, int width, int height) {
   return new bufferedimageluminancesource(image, this.left + left, this.top + top, width, height);
  }
 
  @override
  public boolean isrotatesupported() {
   return true;
  }
 
  @override
  public luminancesource rotatecounterclockwise() {
 
    int sourcewidth = image.getwidth();
   int sourceheight = image.getheight();
 
   affinetransform transform = new affinetransform(0.0, -1.0, 1.0, 0.0, 0.0, sourcewidth);
 
   bufferedimage rotatedimage = new bufferedimage(sourceheight, sourcewidth, bufferedimage.type_byte_gray);
 
   graphics2d g = rotatedimage.creategraphics();
   g.drawimage(image, transform, null);
   g.dispose();
 
   int width = getwidth();
   return new bufferedimageluminancesource(rotatedimage, top, sourcewidth - (left + width), getheight(), width);
  }
 
 }

2.3 编写解析二维码的实现代码

try {
             multiformatreader formatreader = new multiformatreader();
       string filepath = "c:/users/administrator/desktop/testimage/test.jpg";
       file file = new file(filepath);
       bufferedimage image = imageio.read(file);;
       luminancesource source = new bufferedimageluminancesource(image);
       binarizer binarizer = new hybridbinarizer(source);
       binarybitmap binarybitmap = new binarybitmap(binarizer);
       map hints = new hashmap();
       hints.put(encodehinttype.character_set, "utf-8");
       result result = formatreader.decode(binarybitmap,hints);
       
             system.out.println("result = "+ result.tostring());
       system.out.println("resultformat = "+ result.getbarcodeformat());
       system.out.println("resulttext = "+ result.gettext());
             
     } catch (exception e) {
       e.printstacktrace();
     }

现在运行后可以看到控制台打印出了二维码的内容。

到此为止，利用zxing生成和解析二维码就讲述演示完毕，主要为自己做备忘，同时方便有需要的人。呵呵！

以上这篇java利用zxing生成二维码的简单实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。