Java-generated two-dimensional code (and one-dimensional code)--------method

Now post some of the core code, at the end provide all the code download link. Interested friends, you can click on the link to download the source code

Two-dimensional code, is a black-and-white plane geometry through the corresponding coding algorithm to record text, pictures, URLs and other information of the barcode picture.

The following figure
One, Java
Jar Package Required: Qrcode.jar

http://vdisk.weibo.com/

QRCode class: Two-dimensional code operation core class

Package app. Code;

Import Java.awt.Color;
Import Java.awt.Graphics2D;
Import Java.awt.image.BufferedImage;
Import Java.io.File;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.OutputStream;

Import Javax.imageio.ImageIO;

Import Jp.sourceforge.qrcode.QRCodeDecoder;
Import jp.sourceforge.qrcode.exception.DecodingFailedException;

Import Com.swetake.util.Qrcode;

public class QRCode {


public void Encoderqrcode (string content, String Imgpath) {
This.encoderqrcode (content, Imgpath, "PNG", 7);
}


public void Encoderqrcode (String content, outputstream output) {
This.encoderqrcode (content, Output, "PNG", 7);
}


public void Encoderqrcode (string content, String Imgpath, String imgtype) {
This.encoderqrcode (content, Imgpath, Imgtype, 7);
}


public void Encoderqrcode (string content, OutputStream output, string imgtype) {
This.encoderqrcode (content, output, imgtype, 7);
}


public void Encoderqrcode (string content, String Imgpath, string imgtype, int size) {
try {
BufferedImage bufimg = This.qrcodecommon (content, imgtype, size);

File Imgfile = new file (Imgpath);
Generate a two-dimensional code qrcode picture
Imageio.write (bufimg, Imgtype, imgfile);
catch (Exception e) {
E.printstacktrace ();
}
}


public void Encoderqrcode (string content, OutputStream output, string imgtype, int size) {
try {
BufferedImage bufimg = This.qrcodecommon (content, imgtype, size);
Generate a two-dimensional code qrcode picture
Imageio.write (bufimg, imgtype, Output);
catch (Exception e) {
E.printstacktrace ();
}
}


Private BufferedImage Qrcodecommon (string content, string imgtype, int size) {
BufferedImage bufimg = null;
try {
QRCode Qrcodehandler = new QRCode ();
Set the two-dimensional code error rate, optional L (7%), M (15%), Q (25%), H (30%), the higher the rate of error, the less information can be stored, but the requirement for two-dimensional code clarity is smaller
Qrcodehandler.setqrcodeerrorcorrect (' M ');
Qrcodehandler.setqrcodeencodemode (' B ');
Set the two-dimensional code size, the value range 1-40, the larger the value, the larger the size of the information can be stored
Qrcodehandler.setqrcodeversion (size);
Gets the byte array of the content, setting the encoding format
byte[] Contentbytes = content.getbytes ("Utf-8");
Picture size
int imgsize = + (size-1);
bufimg = new BufferedImage (imgsize, imgsize, Bufferedimage.type_int_rgb);
graphics2d GS = Bufimg.creategraphics ();
Set Background color
Gs.setbackground (Color.White);
Gs.clearrect (0, 0, imgsize, imgsize);

Set Image Color > Black
Gs.setcolor (Color.Black);
Set offset, no setting may cause parsing error
int pixoff = 2;
Output > Two-dimensional code
if (contentbytes.length > 0 && contentbytes.length < 800) {
boolean[][] Codeout = Qrcodehandler.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 {
throw new Exception ("qrcode content bytes Length =" + Contentbytes.length + "not in [0, 800].");
}
Gs.dispose ();
Bufimg.flush ();
catch (Exception e) {
E.printstacktrace ();
}
return bufimg;
}


public string Decoderqrcode (string imgpath) {
QRCode Two-dimensional code picture file
File ImageFile = new file (Imgpath);
BufferedImage bufimg = null;
String content = null;
try {
bufimg = Imageio.read (ImageFile);
Qrcodedecoder decoder = new Qrcodedecoder ();
Content = new String (Decoder.decode (New Codeimage (bufimg)), "Utf-8");
catch (IOException e) {
System.out.println ("Error:" + e.getmessage ());
E.printstacktrace ();
catch (Decodingfailedexception DfE) {
System.out.println ("Error:" + dfe.getmessage ());
Dfe.printstacktrace ();
}
return content;
}


Public String Decoderqrcode (InputStream input) {
BufferedImage bufimg = null;
String content = null;
try {
bufimg = Imageio.read (input);
Qrcodedecoder decoder = new Qrcodedecoder ();
Content = new String (Decoder.decode (New Codeimage (bufimg)), "Utf-8");
catch (IOException e) {
System.out.println ("Error:" + e.getmessage ());
E.printstacktrace ();
catch (Decodingfailedexception DfE) {
System.out.println ("Error:" + dfe.getmessage ());
Dfe.printstacktrace ();
}
return content;
}

public static void Main (string[] args) {
String Imgpath = "F:/qrcode.png";
String encodercontent = "hello,world!";
QRCode handler = new QRCode ();
Handler.encoderqrcode (Encodercontent, Imgpath, "PNG");
try {
OutputStream output = new FileOutputStream (Imgpath);
Handler.encoderqrcode (content, output);
catch (Exception e) {
E.printstacktrace ();
// }
System.out.println ("======== wind Blows Rain into flower)";


String decodercontent = Handler.decoderqrcode (Imgpath);
System.out.println ("The analytic result is as follows:");
System.out.println (decodercontent);
System.out.println ("======== time cannot overtake the White Horse =======");
}
}

===================================

Codeimage class: Two-dimensional code Picture object
Package app. Code;


Import Java.awt.image.BufferedImage;


Import Jp.sourceforge.qrcode.data.QRCodeImage;


public class Codeimage implements qrcodeimage{
BufferedImage bufimg;
Public Codeimage (BufferedImage bufferedimage) {
This.bufimg=bufferedimage;
}

public int getheight () {
TODO auto-generated Method Stub
return Bufimg.getheight ();
}


public int GetPixel (int x, int y) {
TODO auto-generated Method Stub
return Bufimg.getrgb (x, y);
}


public int getwidth () {
TODO auto-generated Method Stub
return Bufimg.getwidth ();
}

}

========================================================================

Code Download Address: Instance code download link

One dimensional code generation can refer to: http://blog.csdn.net/cdl0405/article/details/5990545

Two-dimensional code generation can refer to: http://blog.csdn.net/cdl0405/article/details/5990567