Java implements a QR code with logo

Java implements a QR code with logo

QR code applied to all aspects of life, will use code to implement the QR code, I think it must be a bonus skill. All right, let's make it work together.

The QR code that we implement is based on the standard of the code, QR code is a matrix two-dimensional code symbol number developed by Nippon Denso Corporation in 1994, the name is quick Response code

QR Code: Patent open, support Chinese;

Compared with other two-dimensional code, QR code has the advantages of fast reading speed, large data density and small occupied space.

Error correction Ability:

L-level: about 7% of the data code Word can be corrected
M-class: approx. 15% Data code Word Error
Q-level: About 25% of the data code Word can be corrected
H-Class: About 30% of the data code Word can be corrected

After knowing these hard knowledge, we do the preparatory work, we need to download two jar packages, assist us to develop, here I put the link
Http://mavenrepository.com/artifact/com.google.zxing/javase
http://mavenrepository.com/artifact/com.google.zxing/core/3.3.2

We are in our project, a new Java Project project will be able to create a new three lib, Utils, test three folders, lib storage jar, Utils let us write the tool class, test to let us write the testing class

We start with the two-dimensional code of the logo never begin thinking:

1, set some QR code parameters, such as Character set, margin, fault tolerance level

2, generate two-dimensional code

All right, let's make it come true.

/** * * @param width QR code wide * * @param height Two-dimensional code high * * @param content two-dimensional code * */public static void Createqrcode (int width, int height, String content) {//1, set QR code        Some parameters of HashMap hints = new HashMap ();        1.1 Set the character set Hints.put (Encodehinttype.character_set, "utf-8");        1.2 Set the level of fault tolerance, because of the fault tolerance, within a certain range can be the QR code p into your favorite style hints.put (Encodehinttype.error_correction, ERRORCORRECTIONLEVEL.M);        1.3 set margin, (i.e. white area) Hints.put (Encodehinttype.margin, 1); 2. Generate QR Code try {//2.1 define Bitmatrix object Bitmatrix Bitmatrix = new Multiformatwriter (). Encode (Con            Tent, Barcodeformat.qr_code, width, height, hints); 2.2, set the two-dimensional code storage path, and QR code name path Codepath = new File ("c:/users/admin/desktop/code/" + uuid.randomuuid () + ". png")            . Topath ();        2.3, the implementation of the generation of two-dimensional code matrixtoimagewriter.writetopath (Bitmatrix, "PNG", Codepath); } catch (ExcEption e) {//TODO auto-generated catch block E.printstacktrace (); }    }

Let's realize the two-dimensional code idea with logo:

1, our husband into a Logoconfig configuration class, mainly set the logo border color; logo border width; logo size

2, set some two-dimensional code parameters

3, generate two-dimensional code

4. Create two-dimensional code with logo

Let's make it come true.

Logoconfig class

class LogoConfig {    // logo默认边框颜色    public static final Color DEFAULT_BORDERCOLOR = Color.WHITE;    // logo默认边框宽度    public static final int DEFAULT_BORDER = 2;    // logo大小默认为照片的1/6    public static final int DEFAULT_LOGOPART = 6;    private final int border = DEFAULT_BORDER;    private final Color borderColor;    private final int logoPart;    public LogoConfig() {        this(DEFAULT_BORDERCOLOR, DEFAULT_LOGOPART);    }    public LogoConfig(Color borderColor, int logoPart) {        this.borderColor = borderColor;        this.logoPart = logoPart;    }    public Color getBorderColor() {        return borderColor;    }    public int getBorder() {        return border;    }    public int getLogoPart() {        return logoPart;    }}

Tool function to generate two-dimensional code with logo in middle

/** * Generate a logo in the middle of the QR code * * @param width * @param height * @param content */public static void CR        Eatelogoqrcode (int width, int height, String content) {///1, set some parameters of the QR code HashMap hints = new HashMap ();        1.1 Set the character set Hints.put (Encodehinttype.character_set, "utf-8");        1.2 Set the level of fault tolerance, because of the fault tolerance, within a certain range can be the QR code p into your favorite style hints.put (Encodehinttype.error_correction, ErrorCorrectionLevel.H);        1.3 set margin, (i.e. white area) Hints.put (Encodehinttype.margin, 1); 2. Generate QR Code try {//2.1 define Bitmatrix object Bitmatrix Bitmatrix = new Multiformatwriter (). Encode (Con            Tent, Barcodeformat.qr_code, width, height, hints); 2.2, set the two-dimensional code storage path, and the name of the two-dimensional code//Qrfile used to store the generated QR code image file Qrfile = new file ("C:/users/admin/desktop/code"            , Uuid.randomuuid () + ". jpg");            Logofile is used to store a QR code image with a logo file Logofile = new file ("C:/users/admin/desktop/code", "test.jpg");  2.3, the implementation of the generation of two-dimensional code          Matrixtoimagewriter.writetopath (Bitmatrix, "JPG", Qrfile.topath ());            2.4 Add logo to QR code logoconfig logoconfig = new Logoconfig ();                Addlogo (Qrfile, Logofile, logoconfig);        } catch (Exception e) {//TODO auto-generated catch block E.printstacktrace (); }    }

Tool class for adding logos

/** * * @param qrpic QR code file path * @param logopic logo file path * @param logoconfig Configuration class */private static V            OID Addlogo (file qrpic, file Logopic, Logoconfig logoconfig) {if (!qrpic.isfile () | | |!logopic.isfile ()) {            SYSTEM.OUT.PRINTLN ("File not found!");        System.exit (0);            try {//1, read the QR code picture, and build the drawing object bufferedimage image = Imageio.read (qrpic);            Graphics2D graph = image.creategraphics ();            2, read the logo image BufferedImage logo = Imageio.read (logopic);            int widthlogo = Image.getwidth ()/Logoconfig.getlogopart ();            int heightlogo = Image.getheight ()/Logoconfig.getlogopart ();            3, calculate the position of the picture placement int x = (Image.getwidth ()-Widthlogo)/2;            int y = (image.getheight ()-Heightlogo)/2;            4, draw the picture graph.drawimage (logo, x, y, Widthlogo, Heightlogo, NULL);   Graph.drawroundrect (x, Y, Widthlogo, Heightlogo, 10, 10);         Graph.setstroke (New Basicstroke (Logoconfig.getborder ()));            Graph.setcolor (Logoconfig.getbordercolor ());            Graph.drawrect (x, Y, Widthlogo, Heightlogo);                        Graph.dispose ();        Imageio.write (image, "JPEG", New File ("c:/users/admin/desktop/code/newpic.jpg"));        } catch (Exception e) {System.out.println (e); }    }

Let's write a test class to test

@Testpublic void test() {        QrCodeUtils.createQrCode(100, 100, "你好，世界");                QrCodeUtils.readQrCode("C:\\Users\\admin\\Desktop\\code\\4ad3a0a4-8d5c-4cd3-9ee5-5f680233a33f.png");                QrCodeUtils.createLogoQrCode(300, 300, "https://www.jianshu.com/u/f84a2d49420b");        QrCodeUtils.readQrCode("C:\\Users\\admin\\Desktop\\code\\newPic.jpg");    }

I'm not going to let you build a good QR code, you can try it yourself.

We add a tool function that reads the contents of the QR code

 /** * Parse QR code * * @param codepath QR Code store full Path * */public static void Readqrcod            E (String codepath) {try {multiformatreader formatreader = new Multiformatreader ();            File QRCode = new file (Codepath);            BufferedImage image = Imageio.read (QRCode);            Binarybitmap Binarybitmap = new Binarybitmap (new Hybridbinarizer (new Bufferedimageluminancesource (image));            Set the parameters of the QR code HashMap hints = new HashMap ();            Hints.put (Encodehinttype.character_set, "utf-8");            Result result = Formatreader.decode (Binarybitmap, hints);            Print analytic results System.out.println (result.tostring ());            Print two-dimensional code format SYSTEM.OUT.PRINTLN (Result.getbarcodeformat ());        Two-dimensional code text content System.out.println (Result.gettext ());        } catch (Exception e) {System.out.println (e); }    }

Note: QR code is a certain error correction ability, you can put the QR code p into the style you like

Java implements a QR code with logo