Teach you to create a QR code-google.zxing

First, the goal

Enter the URL to generate the QR code of the URL

Ii. Overview

1. Effect: The UI is ugly, but the function is implemented

2. Project directory

Iii. third-party resources used

1.google Sweep Code Pack zxing

2.JQuery

Iv. steps (with MyEclipse)

1. Create a new project, select Web Project

2. Join third-party resources (zxing package and jquery)

2.1

2.1.1 Copy, paste, add zxing jar package (all files are downloaded in the attachment)

2.2.2 Right-click Jar Package Join BuildPath

2.2 Add jquery File

2.2.1 Create a new folder under Webroot JS

Copy and paste the jquery file to this folder

3. Modify the index.jsp page under Webroot as required:

<%@ page language= "java" import= "java.util.*" pageencoding= "utf-8"%><%string path = Request.getcontextpath () ; String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";%> <! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
4. Create a new servlet file
4.1 Right-click Project Folder--"new---->servlet (MyEclipse automatically configures servlet to Web. xml file)
The code for the Qrcode.java servlet file is as follows:
Package Servlet;import Java.io.ioexception;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import util. Qrcodeutil;import Com.google.zxing.writerexception;public class QRCode extends HttpServlet {public void doget ( HttpServletRequest request, HttpServletResponse response) throws Servletexception, IOException { Request.setcharacterencoding ("Utf-8"); Response.setcharacterencoding ("Utf-8"); String website = request.getparameter ("website"); try {qrcodeutil.gengr (website, response.getoutputstream ());} catch ( Writerexception e) {e.printstacktrace ();} String website = request.getattribute ("website"). ToString (); public void DoPost (HttpServletRequest request, httpservletresponse response) throws Servletexception, IOException { Doget (request, Response);}}
5. Create a new auxiliary class file to generate a QR code (QRCODEUTIL.JAVA)
5.1 Right-click Project Folder-"New--->class, such as
The code for Qrcodeutil.java is as follows:
Package Util2;import Java.awt.image.bufferedimage;import Java.io.ioexception;import java.io.outputstream;import Java.util.hashtable;import Javax.imageio.imageio;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;public class QRCodeUtil {private static Final int BLACK = 0xff000000;private static final int white = 0xffffffff;public static void Gengr (String website, outputst Ream output) throws Writerexception, IOException {int width = 300;int height = 300;        String format = "JPG";         Hashtable<encodehinttype, string> hints = new Hashtable<encodehinttype, string> ();        Hashtable hints = new Hashtable (); Hints.put (Encodehinttype.character_set, "utf-8"); Bitmatrix BM = new Multiformatwriter (). Encode (website, barcodeformat.qr_code, width, height, hints); BufferedImage image = Toimage (BM); Imageio.write (image, format, OUTPUt);//writes the QR code to the output stream of response}private static bufferedimage Toimage (Bitmatrix BM) {int width = bm.getwidth (); int height = Bm.get Height (); BufferedImage image = new BufferedImage (width, height, bufferedimage.type_int_rgb), for (INT x = 0;x < width; x + +) {for (in T y = 0; Y < height; y++) {Image.setrgb (x, Y, Bm.get (x, y)? black:white);}} return image;}}
6. Now that all the files have been completed, the next setup project, launch Tomcat, access the files, such as
When the layout is complete, click Debug to start the project
After successful startup, access the file in the browser
Ps:
You can modify the color configuration in the Qrcodeutil.java file to generate a color QR code, for example:
private static final int BLACK = 0xff0000ff;//0xff000000;
private static final int white = 0XFFFFFF00;//0XFFFFFFFF;
Common color codes are as follows:
These color constants are defined in the Android.graphics.Color:

 
 

  
  
 
   
 
    
Type
 
    
Constant
 
    
Value
 
    
color code
 
   
 
   
 
    
Int
 
    
BLACK
 
    
-16777216
 
    
0xff000000
 
   
 
   
 
    
Int
 
    
BLUE
 
    
-16776961
 
    
0xff0000ff
 
   
 
   
 
    
Int
 
    
CYAN
 
    
-16711681
 
    
0xff00ffff
 
   
 
   
 
    
Int
 
    
Dkgray
 
    
-12303292
 
    
0xff444444
 
   
 
   
 
    
Int
 
    
GRAY
 
    
-7829368
 
    
0xff888888
 
   
 
   
 
    
Int
 
    
GREEN
 
    
-16711936
 
    
0xff00ff00
 
   
 
   
 
    
Int
 
    
Ltgray
 
    
-3355444
 
    
0xffcccccc
 
   
 
   
 
    
Int
 
    
MAGENTA
 
    
-65281
 
    
0xffff00ff
 
   
 
   
 
    
Int
 
    
RED
 
    
-65536
 
    
0xffff0000
 
   
 
   
 
    
Int
 
    
TRANSPARENT
 
    
0
 
    
0x00000000
 
   
 
   
 
    
Int
 
    
White
 
    
-1
 
    
0xFFFFFFFF
 
   
 
   
 
    
Int
 
    
YELLOW
 
    
-256
 
    
0xffffff00
 
   
 
  
 
 
Project Annex:
Http://files.cnblogs.com/files/shamgod/QRCode.zip
Teach you to create a QR code-google.zxing