二维码无处不在，扫一扫有礼品哦，现在二维码这么流行，想必大家不是很清楚二维码是怎么生成的吧，现在小编通过给大家分享本文帮助大家学习二维码生成的方法。
其实主要是利用goggle发布的jar来使用的此功能。
1、二维码的生成
将zxing-core.jar 包加入到classpath下。
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。
直接可以生成二维码的代码
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public void test1() throws exception{
string content = "www.baidu.com";
string path = "d://";
multiformatwriter multiformatwriter = new multiformatwriter();//zxing是google提供的关于条码
map hints = new hashmap();
hints.put(encodehinttype.character_set, "utf-8");
bitmatrix bitmatrix = multiformatwriter.encode(content, barcodeformat.qr_code, 400, 400,hints);//这里是照片的大小
file file1 = new file(path,"my.jpg");
matrixtoimagewriter.writetofile(bitmatrix, "jpg", file1);
system.out.println("执行完毕");
}
当我们能发现，这个代码拷贝上后发现有一个matrixtoimagewriter报错，所以需要我们去找，但是这里我贴出代码，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);
}
}
}
现在就可以d盘的根目录下载看生成的二维码了
二维码解析
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);
}
}
解析二维码的代码
multiformatreader formatreader = new multiformatreader();
string filepath = "图片的路径";
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());
tch (exception e) {
e.printstacktrace();
现在这样可以在控制台看到二维码的内容。
以上所述是小编给大家介绍的zxing-core生成二维码的方法并解析的相关知识，希望对大家有所帮助
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