Using zxing to generate a two-dimensional code picture with logo, automatically adjust the logo picture relative to the size of the two-dimensional code picture __java

Use zxing to generate a two-dimensional code picture with logo, automatically adjust the size of the logo picture relative to the two-dimensional code picture
* Optional whether with logo, choose whether to save two-dimensional code picture; result returns a base64 encoded picture data string
* Page display:
* Maven Jar
* <dependency>
<groupId>com.google.zxing</groupId>
<artifactId>core</artifactId>
<version>3.1.0</version>

</dependency>

Two-dimensional code generation tool class download: Click to open the link

Original author http://www.kancloud.cn/digest/javaxviii/126763

I'll get it myself.

1. Two-dimension code with logo

2. Two-dimensional code without logo

3. The list directly reads the two-dimensional code base64 encoded string stored in the database, displayed to the page

Tool class, you can customize the implementation of the resulting picture size, etc.:

Package com.niuhuohuo.assets.utils;
Import Java.awt.Color;
Import Java.awt.Font;
Import Java.awt.Graphics2D;
Import Java.awt.image.BufferedImage;
Import Java.io.ByteArrayOutputStream;
Import Java.io.File;
Import Java.util.Date;
Import Java.util.HashMap;

Import Java.util.Map;

Import Javax.imageio.ImageIO;

Import org.apache.commons.codec.binary.Base64;
Import Com.google.zxing.BarcodeFormat;
Import Com.google.zxing.EncodeHintType;
Import Com.google.zxing.MultiFormatWriter;
Import com.google.zxing.WriterException;
Import Com.google.zxing.common.BitMatrix;

Import Com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; /** * Use zxing to generate a two-dimensional code picture with a logo, automatically adjust the logo picture relative to the size of two-dimensional code picture * Optional logo, whether or not to save two-dimensional code picture; results returns the base64 encoded picture data String * page display:  * maven jar * <dependency> <groupid>com.google.zxing</g
 roupid> <artifactId>core</artifactId> <version>3.1.0</version> </dependency> * @author NHHyx * @date 20170314 */public class Zxingcodeutils {private static final int qrcolor = 0xff000000;   The default is black private static final int bgwhite = 0xFFFFFFFF; Background color public static void main (string[] args) throws Writerexception {try {* * Call Sample 1, from the project to obtain the logo picture, the resulting two-dimensional code picture is also saved to the project designated folder, using MyEclipse, and so on, the resulting two-dimensional code picture in the tomcat/webapps/project///Generate two-dimensional code picture and base64 Code data is updated to the database, data:image/png;base64,***//logo picture/*string Logourl = Request.getsession (). Getservletcontext (). Get
		    Realpath ("/web-inf/assets/admin/img/temp/logo.png");
        	File Logofile = new file (Logourl); 
        	Output two-dimensional code path String Outpath = Request.getsession (). Getservletcontext (). Getrealpath ("/web-inf/assets/qr"); String base64img = Zxingcodeutils.createqrcode (Logofile, "This is the contents of the two-dimensional code, can be HTTP URL", Outpath, 400, 400, "this is a two-dimensional code picture under the text, with the image generated "); * * Call the Sample 2/*//string FilePath = request.getsession (). GetservletconteXT (). Getrealpath ("/") + "resources/images/logoimages/llhlogo.png"; /* Logo picture path and two-dimensional code output path String Logourl = Request.getsession (). Getservletcontext (). Getrealpath ("/web-inf/assets/
        	Admin/img/temp/logo.png "); String Outpath = Request.getsession (). Getservletcontext (). Getrealpath ("/WEB-INF/ASSETS/QR"); * *//filepath is two
        	Dimension Code logo path, but in practice we are placed under a certain path of the project, so the path with the above, the following note is good String Logopath = "C:\\logo.png";
        	File Logofile = new file (Logopath);
        	String Outpath = "C:";
        Createqrcode (Logofile, "2asdf5", Outpath, 400, 400, "This is the two-dimensional code under the text");  
        catch (Exception e) {e.printstacktrace (); /** * Generate a two-dimensional code picture with a logo * @param logopath two-dimensional code picture contains the logo picture file, if not, then generate a two-dimensional code without a logo picture * @param co Ntent content or Jump path * @param outpath two-dimensional code output path, if "" will not output the picture to the specified position, only return base64 picture String * @param qrimgwidth two-dimensional code picture width * @par Am Qrimgheight Two-dimensional code picture height (with text will be heightened 45px) * @param productnAme the text under the two-dimensional code picture * @return/public static string Createqrcode (File logofile, string content, String Outpath,  int qrimgwidth, int qrimgheight, String productName) {try {zxingcodeutils ZP = new
        	Zxingcodeutils (); Generate a two-dimensional code bufferedimage picture BufferedImage BIM = zp.getqrcodebufferedimage (content, Barcodeformat.qr_code, Qrimgwid
            
            Th, Qrimgheight, Zp.getdecodehinttype ()); If there is text, the two-dimensional code picture height increases by 45px if (! "").
        	Equals (ProductName)) {qrimgheight = 45; //To add a logo to the two-dimensional code picture and save it to the specified location, return the base64 encoded picture data string returned Zp.createlogoqrcode (Outpath, Qrimgwidth, qrimg
        Height, Bim, Logofile, New Logoconfig (), productName);
        catch (Exception e) {e.printstacktrace ();
    return null; /** * To add logo image to two-dimensional code picture and generate final two-dimensional code picture * @param outpath output two-dimensional code picture path, if "" is not output picture to the specified location, only return base64 picture String * @para M qrimgwidth to generate two-dimensional codePicture Width * @param qrimgheight generate two-dimensional code picture Height * @param bim read two-dimensional code picture bufferedimage Object * @param logopic logo picture file * @param logoconfig Logo configuration * @param productName the text under the two-dimensional code picture * @return Returns the encoded string of the picture base64/public Strin G Createlogoqrcode (String outpath, int qrimgwidth, int qrimgheight, BufferedImage Bim, File logopic, Logoconfig logoconfig
            , String productName) {try {/** * reads a two-dimensional code picture and constructs a drawing object * *
            
            BufferedImage image = Bim; If the logo picture exists, add it to the two-dimensional code picture if (logopic!= null && logopic.exists ()) {graphics2d g = image.cr
	
	            Eategraphics ();
	            /** * Read logo picture * * BufferedImage logo = Imageio.read (logopic); /** * Set the size of the logo, I set the two-dimensional code picture of 20%, because the General Assembly to cover up the two-dimensional code */int widthlogo = Logo.getwidth (null) & Gt;image.getwidth () *3/10? (Image.getwidth () *3/10): Logo.getwidth (nulL), Heightlogo = Logo.getheight (null) >image.getheight () *3/10?
	
	            (Image.getheight () *3/10): Logo.getwidth (NULL);
	             /** * logo is placed in center * * * int x = (Image.getwidth ()-Widthlogo)/2;
	             int y = (image.getheight ()-Heightlogo)/2;
	             /** * logo in the lower right corner * int x = (Image.getwidth ()-Widthlogo);
	             * Int y = (image.getheight ()-Heightlogo);
//Start drawing picture g.drawimage (logo, x, y, Widthlogo, Heightlogo, NULL);
G.drawroundrect (x, Y, Widthlogo, Heightlogo, 15, 15);
G.setstroke (New Basicstroke (Logoconfig.getborder ()));
G.setcolor (Logoconfig.getbordercolor ());
            	G.drawrect (x, Y, Widthlogo, Heightlogo);
            	
            	G.dispose ();
            Logo.flush (); //Add the name of the product, the name of the product should not be too long, here support two lines. Too long will automatically intercept if (ProductName!= null &AMP;&AMP,!productname.equals ("")) {//new picture, add text underneath the two-dimensional code with logo bufferedimage outimage = new Buffer
                Edimage (Qrimgwidth, Qrimgheight, BUFFEREDIMAGE.TYPE_4BYTE_ABGR);
                Graphics2D OUTG = Outimage.creategraphics ();
                Draw the two-dimensional code to the new panel outg.drawimage (image, 0, 0, image.getwidth (), image.getheight (), NULL); 
                Draw the text to the new panel Outg.setcolor (Color.Black); Outg.setfont (New Font ("Song Body", Font.Bold, 26));
                Font, typeface, font size int strwidth = Outg.getfontmetrics (). Stringwidth (ProductName); if (Strwidth > 399) {////length is too long to intercept the front part//outg.drawstring (productName, 0, Image.gethe Ight () + (Outimage.getheight ()-image.getheight ())/2 + 5); Draw text//length too long to wrap String productName1 = productname.substring (0, Productname.length (
                    )/2); String productName2 = productname.substring (Productname.length ()/2, Productname.length ());
                    int strWidth1 = Outg.getfontmetrics (). Stringwidth (PRODUCTNAME1);
                    int strWidth2 = Outg.getfontmetrics (). Stringwidth (productName2); 
                    Outg.drawstring (productName1, 200-STRWIDTH1/2, Image.getheight () + (Outimage.getheight ()-image.getheight ())/2 + 12);
                    BufferedImage outImage2 = new BufferedImage (485, BUFFEREDIMAGE.TYPE_4BYTE_ABGR);
                    Graphics2D OUTG2 = Outimage2.creategraphics ();
                    Outg2.drawimage (outimage, 0, 0, outimage.getwidth (), outimage.getheight (), NULL); 
                    Outg2.setcolor (Color.Black); Outg2.setfont (New Font ("Song Body", Font.Bold, 26)); fonts, font, font size outg2.drawstring (productName2, 200-STRWIDTH2/2, Outimage.getheight () + (outimage2.gethe
                    Ight ()-outimage.getheight ())/2 + 5); 
                    Outg2.dispose ();
                    Outimage2.flush (); Outimage = OUtImage2; }else {outg.drawstring (ProductName, 200-STRWIDTH/2, Image.getheight () + (Outimage.getheight ()-I Mage.getheight ())/2 + 12); 
                Draw text} outg.dispose ();
                Outimage.flush ();
            image = Outimage;
            }//logo.flush ();
            Image.flush ();
            Bytearrayoutputstream BAOs = new Bytearrayoutputstream ();
            Baos.flush ();

            Imageio.write (Image, "png", BAOs); If the output path is empty, the two-dimensional code picture is not saved under the specified path if (!). Equals (Outpath.trim ())) {//two D-code generated path, but in the actual project, we are showing the generated two-dimensional code to the interface, so the following line of code can be commented out///You can see that this method eventually returns the Two-dimensional code IMAGEBASE64 string//front End with  Where ${imagebase64qrcode}   
            ImageBase64 string Imageio.write (image, "PNG", new File (Outpath + "\" + New Date (), getTime () + ". png") for the two-dimensional code; //Get Base64 encoded two-dimensional code pictureString imagebase64qrcode = Base64.encodebase64string (Baos.tobytearray ());
            Baos.close ();
        return imagebase64qrcode;
        catch (Exception e) {e.printstacktrace ();
    return null; /** * Build Initialization two-dimensional code * * @param BM * @return/public bufferedimage filetobufferedimage (Bit
        Matrix BM) {bufferedimage image = null;
            try {int w = bm.getwidth (), H = bm.getheight ();

            Image = New BufferedImage (W, H, Bufferedimage.type_int_rgb);
                    for (int x = 0; x < W x + +) {for (int y = 0; y < h; y++) {
                Image.setrgb (x, Y, Bm.get (x, y)? 0xff000000:0xffccddee);
        A catch (Exception e) {e.printstacktrace ());
    } return image; /** * Generate a two-dimensional code bufferedimage picture * * @param content * Encoded CONTENTS * @param barcodeformat * Encoding type * @param width *
    Picture Width * @param height * Picture Heights * @param hints * Set parameters * @return * * Public bufferedimage getqrcodebufferedimage (String content, Barcodeformat barcodeformat, int width, int height, map<
        Encodehinttype,?> hints) {multiformatwriter multiformatwriter = null;
        Bitmatrix BM = NULL;
        BufferedImage image = null;
            try {multiformatwriter = new multiformatwriter (); The parameter order is: encoding content, encoding type, generating picture width, generating picture height, setting parameters BM = Multiformatwriter.encode (content, Barcodeformat, width, height, h
            INTs);
            int w = bm.getwidth ();
            int h = bm.getheight ();

            Image = New BufferedImage (W, H, Bufferedimage.type_int_rgb);
      Start using two-dimensional code data to create bitmap pictures, respectively, set to Black (0xFFFFFFFF) White (0xff000000) for (int x = 0; x < W x + +)      {for (int y = 0; y < h; y++) {Image.setrgb (x, Y, Bm.get x, Y)?
                Qrcolor:bgwhite);
        A catch (Writerexception e) {e.printstacktrace ());
    } return image; /** * Set the format parameter of the two-dimensional code * * @return/public Map<encodehinttype, Object> Getdecodehinttype ( {///used to set QR two-dimensional code parameter Map<encodehinttype, object> hints = new Hashmap<encodehinttype, object>
        ();
        Set the error-correcting level (H is the highest level) for QR two-dimensional code hints.put (encodehinttype.error_correction, ErrorCorrectionLevel.H);
        Set encoding mode Hints.put (Encodehinttype.character_set, "utf-8");
        Hints.put (encodehinttype.margin, 0);
        Hints.put (Encodehinttype.max_size, 350);

        Hints.put (encodehinttype.min_size, 100);
    return hints; }/** * Logo configuration * @author Nhhyx * */class Logoconfig {//logo default border color PubliC static final Color Default_bordercolor = Color.White;
    Logo default border width public static final int default_border = 2;

    The logo size defaults to the photo's 1/5 public static final int default_logopart = 5;
    Private final int border = Default_border;
    Private final Color bordercolor;

    private final int logopart; /** * Creates a default Config with in color {@link #BLACK} and off color * {@link #WHITE}, generating normal bl
     Ack-on-white Barcodes.
    * * 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;
 }
}