Generation of two-dimensional code

(a) Two-dimensional code generation step

1. Generate a two-dimensional code matrix

2. Coloring the two-dimensional code matrix

3. Generation of QR code files

(b) Code

1. Use Goole's Core.jar, Core-3.2.0.jar here, download link Http://pan.baidu.com/s/1kTu0EyF

Package Resume.util;import com.google.zxing.*; import Com.google.zxing.client.j2se.bufferedimageluminancesource;import Com.google.zxing.common.BitMatrix; Import Com.google.zxing.common.hybridbinarizer;import Javax.imageio.imageio;import java.awt.image.BufferedImage; Import Java.io.file;import java.io.ioexception;import java.util.Hashtable;/** * Created by vinphy on 2015/6/30.*/ Public classQrcodeutil {Private StaticFinal String CHARSET ="Utf-8"; Private StaticFinalintBLACK =0xff000000; Private StaticFinalintWhite =0xFFFFFFFF; /** 1. Generate a two-dimensional code matrix * @param text to generate a specified string of two-dimensional code; * Width width; height height*/         Public StaticBitmatrix Toqrcodematrix (String text,integer width,integer height) {//1) Determine the width and height of the matrix, 300*300            if(Width = =NULL|| Width < -) {width= -; }            if(Height = =NULL|| Height < -) {Height= -; }            //2) Set the QR code picture formathashtable<encodehinttype,string> hints =NewHashtable<encodehinttype,string>(); //3) Set the encoding used for the contentHints.put (Encodehinttype.character_set,charset); //4) Generate matrixBitmatrix matrix =NULL; Try{Matrix=NewMultiformatwriter (). Encode (text, barcodeformat.qr_code,width,height,hints); }Catch(writerexception e) {e.printstacktrace (); }            returnMatrix; }        /** 2. Generate black and white images based on dot matrix * @param matrix Two-dimensional code matrices*/         Public Staticbufferedimage tobufferedimage (Bitmatrix matrix) {//1. Get the matrix length and width            intwidth =matrix.getwidth (); intHeight =matrix.getheight (); //2. Get Bufferediamge instancesBufferedImage image =NewBufferedImage (WIDTH,HEIGHT,BUFFEREDIMAGE.TYPE_INT_RGB); //3. Coloring             for(intx =0; x <width; X + +){                 for(inty =0; Y < height; y++) {Image.setrgb (X,y,matrix.Get(x, y)?black:white); }            }            returnimage; }        /** 3. Generate files according to the matrix picture format * @param matrix of two-dimensional code; * Format file formats, such as GIF; * File Files*/         Public Static voidwritetofile (Bitmatrix matrix,string format,file File) {//1. Get black and white imagesBufferedImage image =tobufferedimage (matrix); //2. Generating Files            Try {                if(!Imageio.write (Image,format,file)) {                    Throw NewIOException (("Could not write an image of format") +format+" to"+file); }            }Catch(IOException e) {e.printstacktrace (); }        }
　　}
   

2. Testing

 Public Static voidMain (string[] args) {//1. Text to convertString Text ="Ningwenhui"; //2. Generating FilesFile File =NewFile ("D:"+file.separator+"Vinphy.gif"); //3. Create a QR code in the fileWriteToFile (Toqrcodematrix (text,NULL,NULL),"gif", file); }

Google's Zxing-core.jar package encapsulates a way to generate black-and-white images and generate files, using the following:

/ ** * QR code generation * generates the corresponding QR code based on the six-bit random number generated by GetInfo () **/     Publicvoid Createcode () {String text=""+ This. GetInfo (); intwidth = the; intHeight = the; /** * Set the parameters of the QR code*/String name="Erweima"; String Path="d://create"; HashMap hints=NewHashMap (); //the encoding used for the contentHints.put (Encodehinttype.character_set,"Utf-8"); Try{Bitmatrix Bitmatrix=NewMultiformatwriter (). Encode (text,barcodeformat.qr_code,width,height,hints); //generate two-dimensional codeFile file1 =NewFile (path,name+". jpg"); Matrixtoimagewriter.writetofile (Bitmatrix,"jpg", file1); } Catch(Exception e) {e.printstacktrace (); }    }

Generation of two-dimensional code