Using Java design to generate a two-dimensional code detail tutorial _java

I'll teach you step-by-step. Generate two-dimensional code with Java design

In the era of the Internet of things, two-dimensional code is a very important thing, and now no matter what things must be a two-dimensional code signs, lest outdated, the cops did not use two-dimensional code to identify. Perhaps one day zoning card or hukou will be used to identify the two-dimensional code. Today's whim, see others for their blog added two-dimensional code, I also want to do a test.

Mainly used to achieve two points:

1. Generate a two-dimensional code of any text.

2. Add an image to the middle of a two-dimensional code.

First, the preparatory work.

Prepare the QR two-dimensional Code 3.0 version of the core package and a JPG picture.

Download QR Two-dimensional code packs.

First we have to download the Zxing.jar package, I'm here with the 3.0 version of the core package

Download Address: Now migrated to github:https://github.com/zxing/zxing/wiki/getting-started-developing,

Of course, you can also download jar packs from the Maven warehouse: http://central.maven.org/maven2/com/google/zxing/core/

Second, program design

1, start Eclipse, a new Java project, a good project name (this example named Qrcodesoft). Click Next:

2, Import Zxing.jar package, I am here with the 3.0 version of the core package: Point "add external jar (X) ...".

3, the new two classes, respectively:

Bufferedimageluminancesource.java

Qrcodeutil.java

The key code is: Bufferedimageluminancesource.java and Qrcodeutil.java, where the main method of the test is in Qrcodeutil.java.

Bufferedimageluminancesource.java Program code:

Package Com.yihaomen.barcode;
Import Java.awt.Graphics2D;
Import Java.awt.geom.AffineTransform;

Import Java.awt.image.BufferedImage;

Import Com.google.zxing.LuminanceSource;
	public 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 R

		Ectangle does not fit within image data. "); for (int y = top; y < top + height; y++) {for (int x = left; x < left + width; + +) {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; Public byte[] GetRow (int y, byte[] row {if (Y < 0 | | | y >= getheight ()) {throw new Illegalargumentexcep
		tion ("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;
		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;
	public Boolean iscropsupported () {return true; Public Luminancesource crop (int. left, int top, int width, int height) {return new BufFeredimageluminancesource (image, This.left + left, This.top + top, width, height);
	public Boolean isrotatesupported () {return true;
		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 to New Bufferedimageluminancesource (Rotatedimage, Top, Sourcewidth-(left + width), getheight (), width);
 }
}

Qrcodeutil.java Program code:

Package Com.yihaomen.barcode;
Import Java.awt.BasicStroke;
Import Java.awt.Graphics;
Import Java.awt.Graphics2D;
Import Java.awt.Image;
Import Java.awt.Shape;
Import Java.awt.geom.RoundRectangle2D;
Import Java.awt.image.BufferedImage;
Import Java.io.File;
Import Java.io.OutputStream;
Import java.util.Hashtable;

Import Java.util.Random;

Import Javax.imageio.ImageIO;
Import Com.google.zxing.BarcodeFormat;
Import Com.google.zxing.BinaryBitmap;
Import Com.google.zxing.DecodeHintType;
Import Com.google.zxing.EncodeHintType;
Import Com.google.zxing.MultiFormatReader;
Import Com.google.zxing.MultiFormatWriter;
Import Com.google.zxing.Result;
Import Com.google.zxing.common.BitMatrix;
Import Com.google.zxing.common.HybridBinarizer;

Import Com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
	/** * Two-dimensional Code tool class */public class Qrcodeutil {private static final String CHARSET = "Utf-8";
	private static final String Format_name = "JPG"; Two-dimensional code size private static final int qrcode_size = 300;
	Logo width private static final int width = 60;

	Logo height private static final int height = 60; private static BufferedImage CreateImage (string content, String Imgpath, Boolean needcompress) throws Exception {has
		Htable<encodehinttype, object> hints = new Hashtable<encodehinttype, object> ();
		Hints.put (Encodehinttype.error_correction, ErrorCorrectionLevel.H);
		Hints.put (Encodehinttype.character_set, CHARSET);
		Hints.put (Encodehinttype.margin, 1); 
		Bitmatrix Bitmatrix = new Multiformatwriter (). Encode (content, Barcodeformat.qr_code, qrcode_size, qrcode_size, hints);
		int width = bitmatrix.getwidth ();
		int height = bitmatrix.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, Bitmatrix.get (x, y)?
			0XFF000000:0XFFFFFFFF); } if (Imgpath = null | |
		"". Equals (Imgpath)) {return image;}//Insert Picture qrcodeutil.insertimage (image, Imgpath, needcompress);
	return image; 
	 /** * Insert Logo * * @param source * Two-dimensional code picture * @param Imgpath * Logo image Address * @param needcompress * Whether compression * @throws Exception */private static void Insertimage (BufferedImage source, String Imgpath, Boolean needcompress
		) throws Exception {File File = new file (Imgpath); if (!file.exists ()) {System.err.println ("+imgpath+") the file does not exist!
			");
		Return
		Image src = imageio.read (new File (Imgpath));
		int width = src.getwidth (null);
		int height = src.getheight (null);
			if (needcompress) {//Compress logo if (width > width) {width = width;
			} if (height > height) {height = height;
			Image image = Src.getscaledinstance (width, height, image.scale_smooth);
			BufferedImage tag = new BufferedImage (width, height, bufferedimage.type_int_rgb);
			Graphics g = tag.getgraphics (); G.drawimage (image, 0, 0, NULL);
			Draw the reduced figure g.dispose (); src = iMage
		}//Insert logo graphics2d graph = source.creategraphics ();
		int x = (qrcode_size-width)/2;
		int y = (qrcode_size-height)/2;
		Graph.drawimage (src, x, y, width, height, null);
		Shape shape = new Roundrectangle2d.float (x, y, Width, width, 6, 6);
		Graph.setstroke (New Basicstroke (3f));
		Graph.draw (Shape);
	Graph.dispose ();
	 /** * Generate two-dimensional code (embedded logo) * * @param content * Contents * @param imgpath * Logo address * @param destpath * Storage Directory * @param needcompress * Compressed logo * @throws Exception/public static void encode (string content, String Imgpat H, String destpath, Boolean needcompress) throws Exception {bufferedimage image = qrcodeutil.createimage (content, IM
		Gpath, needcompress);
		Mkdirs (DestPath);
		String file = new Random (). Nextint (99999999) + ". jpg";
	Imageio.write (image, Format_name, new File (destpath+ "/" +file)); /** * When a folder does not exist, Mkdirs automatically creates a multi-tiered directory, distinguished from mkdir.
	(MkDir throws an exception if the parent directory does not exist) * @author Lanyuan * email:mmm333zzz520@163.com * @date 2013-12-11 Morning 10:16:36 * @param destpath Storage Directory * * public static void Mkdirs (String destpath) {File file =ne 
		W File (DestPath); When a folder does not exist, Mkdirs automatically creates a multi-tiered directory, distinguished from mkdir.
		(MkDir throws an exception if the parent directory does not exist) if (!file.exists () &&!file.isdirectory ()) {file.mkdirs (); /** * Generate two-dimensional code (embedded logo) * * @param content * Contents * @param imgpath * Logo address * @param destpath * Store Address * @throws Exception */public static void encode (string content, String Imgpath, String destpath) throws Except
	Ion {Qrcodeutil.encode (content, Imgpath, DestPath, false);
	 /** * Generate a two-dimensional code * * @param content * @param destpath * Storage Address * @param needcompress * Whether compression logo * @throws Exception */public static void encode (string content, String DestPath, Boolean needcompress) throws Exce
	ption {qrcodeutil.encode (content, NULL, destpath, needcompress);
/** * Generate a two-dimensional code * * @param content * @param destpath * Storage address * @throws Exception	 */public static void encode (string content, String destpath) throws Exception {qrcodeutil.encode (content, null, des
	Tpath, false);  /** * Generate two-dimensional code (embedded logo) * * @param content * Contents * @param imgpath * Logo address * @param output stream *
			@param needcompress * is compressed logo * @throws Exception/public static void encode (string content, String Imgpath, OutputStream output, Boolean needcompress) throws Exception {bufferedimage image = Qrcodeutil.createimage (content, I
		Mgpath, needcompress);
	Imageio.write (image, format_name, output); /** * Generates a two-dimensional code * * @param content * @param output * @throws Exception/public static V
	OID encode (String content, OutputStream output) throws Exception {qrcodeutil.encode (content, NULL, output, false); /** * Parse Two-dimensional code * * @param file * Two-dimensional code picture * @return * @throws Exception/public static String decode (Fil
		E file) throws Exception {bufferedimage image; Image = Imageio.read (file);
		if (image = = null) {return null;
		} bufferedimageluminancesource Source = new Bufferedimageluminancesource (image);
		Binarybitmap bitmap = new Binarybitmap (new Hybridbinarizer (source));
		result result;
		Hashtable<decodehinttype, object> hints = new Hashtable<decodehinttype, object> ();
		Hints.put (Decodehinttype.character_set, CHARSET);
		result = new Multiformatreader (). Decode (bitmap, hints);
		String resultstr = Result.gettext ();
	return resultstr; /** * Parse the two-dimensional code * * @param path * Two-dimensional code picture address * @return * @throws Exception/public static String decode (S
	Tring path) throws Exception {return Qrcodeutil.decode (new File (path));
		public static void Main (string[] args) throws Exception {String text = "http://www.yihaomen.com";
	Qrcodeutil.encode (text, "C:/me.jpg", "C:/barcode", true);
 }
}

Generate a two-dimensional code with no logo

The program code is as follows:

public static void Main (string[] args) throws Exception {
  String text = "http://www.dans88.com.cn";
  Qrcodeutil.encode (Text, "", "D:/myworkdoc", True);
}

Run this test method, the generated two-dimensional code without logo, the style is as follows:

I'd be interested in a cellphone scan.

Generate a two-dimensional code with logo

Logo can use their own avatar, or a picture of their favorite can be, using the following code, the program code is as follows:

public static void Main (string[] args) throws Exception {
  String text = "http://www.dans88.com.cn";
  Qrcodeutil.encode (text, "D:/myworkdoc/my180.jpg", "D:/myworkdoc", true);
 

The only difference is that, on the basis of the previous designation of the address of the logo, where the test using the C-disk picture file

Use the mobile phone scan, can appear to appear text, click on to enter their own website.

The above is to use Java design to generate two-dimensional code, interested friends can refer to, thank you all for the support of this site!