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。
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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移动技术网。
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