详解ZXing-core生成二维码的方法并解析

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

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