Coding, decoding and example parsing of two-dimensional code qrcode in Java _java

Coding and decoding of two-dimensional code qrcode in Java

Related to some of the main class library, convenient for everyone to download:

Code Lib:Qrcode_swetake.jar (Website introduction-- http://www.swetake.com/qr/index-e.html)

Decoding Lib:qrcode.jar (Website introduction-- http://sourceforge.jp/projects/qrcode/)

"One", Code:

Java Code Qrcodeencoderhandler.java

Package Michael.qrcode; 
Import Java.awt.Color; 
Import Java.awt.Graphics2D; 
Import Java.awt.image.BufferedImage; 
 
Import Java.io.File; 
 
Import Javax.imageio.ImageIO; 
 
Import Com.swetake.util.Qrcode; /** * Two-dimensional code generator * @blog http://sjsky.iteye.com * @author Michael/public class Qrcodeencoderhandler {/** * generates a two-dimensional code 
 
 (qrcode) Picture * @param content * @param imgpath/public void Encoderqrcode (string content, String Imgpath) {try { 
 QRCode Qrcodehandler = new QRCode (); 
 Qrcodehandler.setqrcodeerrorcorrect (' M '); 
 Qrcodehandler.setqrcodeencodemode (' B '); 
 
 Qrcodehandler.setqrcodeversion (7); 
 SYSTEM.OUT.PRINTLN (content); 
 
 byte[] Contentbytes = content.getbytes ("gb2312"); 
 
 BufferedImage bufimg = new BufferedImage (140, 140, BUFFEREDIMAGE.TYPE_INT_RGB); 
 
 graphics2d GS = Bufimg.creategraphics (); 
 Gs.setbackground (Color.White); 
 
 Gs.clearrect (0, 0, 140, 140); 
 
 Set Image Color > Black gs.setcolor (Color.Black); 
 Setting offset without setting may cause parsing error int pixoff = 2; //output > two-dimensional code if (Contentbytes.length > 0 && contentbytes.length <) {boolean[][] codeout = Qrcodeh 
 Andler.calqrcode (contentbytes); 
  for (int i = 0; i < codeout.length. i++) {for (int j = 0; J < Codeout.length; J +) {if (Codeout[j][i]) { 
  Gs.fillrect (J * 3 + Pixoff, I * 3 + Pixoff, 3, 3);  else {System.err.println ("qrcode content bytes Length = + contentbytes.length +" not in [0,120]. 
 "); 
 } gs.dispose (); 
 
 Bufimg.flush (); 
 
 File Imgfile = new file (Imgpath); 
 
 Generate two-dimensional Code qrcode picture Imageio.write (bufimg, "PNG", imgfile); 
 catch (Exception e) {e.printstacktrace (); }/** * @param args the command line arguments/public static void main (string[] args) {String Imgpath 
 
 = "D:/test/twocode/michael_qrcode.png"; 
 String content = "Hello big, small, welcome to qrcode!" 
 
 + "\nmyblog [http://sjsky.iteye.com]" + "\nemail [sjsky007@gmail.com]" + "\ntwitter [@suncto]"; Qrcodeencoderhandler hAndler = new Qrcodeencoderhandler (); 
 
 Handler.encoderqrcode (content, Imgpath); 
 SYSTEM.OUT.PRINTLN ("Encoder qrcode success"); } 
}

The two-dimensional code picture that is generated after the run is as follows:

At this time can be used mobile phone two-dimensional code scanning software (I use: Android quick two-dimensional code) to test, recognition of the success of the screenshot is as follows:

Like friends can be downloaded after a try, do some business cards or their favorite things. Of course, Java can also be a two-dimensional code image decoding, see the following about the decoding content.

"Two", decoding:

Java Code Qrcodedecoderhandler.java

Package Michael.qrcode; 
Import Java.awt.image.BufferedImage; 
Import Java.io.File; 
 
Import java.io.IOException; 
 
Import Javax.imageio.ImageIO; 
Import Jp.sourceforge.qrcode.QRCodeDecoder; 
Import Jp.sourceforge.qrcode.data.QRCodeImage; 
 
Import jp.sourceforge.qrcode.exception.DecodingFailedException;  /** * @blog http://sjsky.iteye.com * @author Michael/public class Qrcodedecoderhandler {/** * Decoding the two-dimensional code * @param Imgpath * @return String/*/public string Decoderqrcode (string imgpath) {//QRCode two-dimensional code picture files File ImageFile = n 
 
 EW File (Imgpath); 
 BufferedImage bufimg = null; 
 String decodeddata = null; 
 
 try {bufimg = Imageio.read (ImageFile); 
 Qrcodedecoder decoder = new Qrcodedecoder (); 
 
 Decodeddata = new String (Decoder.decode (New J2seimage (bufimg))); 
 try {//System.out.println (New String (Decodeddata.getbytes ("gb2312"),//"gb2312")); catch (Exception e) {////Todo:handle Exception//} catch (IOException e) {System.out. println ("Error:" + e.getmessage ()); 
 E.printstacktrace (); 
 catch (Decodingfailedexception DfE) {System.out.println ("Error:" + dfe.getmessage ()); 
 Dfe.printstacktrace (); 
 return decodeddata; }/** * @param args the command line arguments/public static void main (string[] args) {Qrcodedecoderhandler 
 Handler = new Qrcodedecoderhandler (); 
 String Imgpath = "D:/test/twocode/michael_qrcode.png"; 
 String decodercontent = Handler.decoderqrcode (Imgpath); 
 System.out.println ("The analytic result is as follows:"); 
 System.out.println (decodercontent); 
 System.out.println ("========decoder success!!!"); 
 
 Class J2seimage implements Qrcodeimage {BufferedImage bufimg; 
 Public J2seimage (BufferedImage bufimg) {this.bufimg = bufimg; 
 public int getwidth () {return bufimg.getwidth (); 
 public int getheight () {return bufimg.getheight (); 
 public int GetPixel (int x, int y) {return Bufimg.getrgb (x, y); } 
 
 } 
}

The results of the operation are as follows (the decoded content is the same as what was previously entered):

The results of the analysis are as follows:

Hello big, small, welcome to qrcode!

MyBlog [http://sjsky.iteye.com]

EMail [sjsky007@gmail.com]

Twitter [@suncto]

========decoder Success!!!

The above is the Java implementation of two-dimensional code QRCode coding and decoding of data collation, follow-up continue to supplement the relevant information, thank you for your support of this site!