Generate two-dimensional code picture in Java __java

Java generation two-dimensional code picture

There are several ways to generate two-dimensional code images in Java, such as Google's Zxing Toolkit and Swetakeqrcode Toolkit.
The following uses the Swetakeqrcode toolkit to generate a two-dimensional code picture sample:
Pom File introduces Swetakeqrcode toolkit dependencies:

<!--two-dimensional code generation tool jar Package-->
<dependency>
    <groupId>com.swetake.util</groupId>
    < artifactid>qrcode</artifactid>
    <version>1.0</version>
</dependency>

Qrcodeimageutil Tool Class Code:

* * Filename Qrcodeimageutil.java * Company XXX Information Technology Co., Ltd.

* @author Leo * @version 3.4.0 * * Package com.leo.common.imageutil;
Import Java.awt.Color;
Import Java.awt.Graphics2D;
Import Java.awt.Image;
Import Java.awt.image.BufferedImage;
Import Java.io.File;

Import Java.io.OutputStream;

Import Javax.imageio.ImageIO;
Import Org.apache.log4j.Logger;

Import Org.springframework.data.redis.connection.DataType;
Import Com.swetake.util.Qrcode;
Import Com.leo.common.cache.RedisCacheManager;
Import Com.leo.common.platform.PJectPathUtil;

Import Com.leo.common.platform.config.ConfigResource;  /** * Two-dimensional code generation tool class * * @author Leo * @since 3.4.0_2016 year June 29 * * Public class Qrcodeimageutil {private static Logger

    Logger = Logger.getlogger (Qrcodeimageutil.class);

    private static final String Imagesavepath = Configresource.getconfig (). GetProperty ("Image.save.path");

    private static final String Imagevisitpath = Configresource.getconfig (). GetProperty ("Image.visit.path"); PrivaTe static final Rediscachemanager manager = Rediscachemanager.getinstance ();

    public static final String two_code_img_key_name = "Two_code_img_"; /** * Generate two-dimensional code (QRCODE) picture (with logo)--Output to file * @param content two-dimensional code picture contents * @param imgpath generate a two-dimensional code picture complete path * param Logopath Two-dimensional code picture in the middle of the logo path * @param version two-dimensional code versions, a value range of 1-40, the larger the value of the larger size, the greater the information can be stored * @return 0: Said success-1: To express the content of the incoming ask Question-100: Generates an exception * @author Leo * @since 3.4.0_2016 year June 29 * * public static int Createqrcode (String Co
               Ntent, String imgpath,string logopath,int version) {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 requirements of two-dimensional code clarity Qrcodehandler.setqrcodee
               Rrorcorrect (' M ');
               n represents a number, and a represents a character a-z,b representing other characters qrcodehandler.setqrcodeencodemode (' B ');
            Set up a two-dimensional code version, take a value range of 1-40, the larger the value of the larger size, the more information can be stored qrcodehandler.setqrcodeversion (version);   Picture size int imgsize =67 + (version-1);
               byte[] Contentbytes = content.getbytes ("UTF-8");
               BufferedImage image = New BufferedImage (imgsize, imgsize, Bufferedimage.type_int_rgb);

               graphics2d GS = Image.creategraphics ();
               Gs.setbackground (Color.White);

               Gs.clearrect (0, 0, imgsize, imgsize);

               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 < 130) {
                   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 {Logger}}}}
                   . info ("qrcode content bytes Length =" + Contentbytes.length + "not in [0,125].");
               return-1;
               Image logo = Imageio.read (new File (Logopath));//Instantiate an Image object. int Widthlogo = Logo.getwidth (null) >image.getwidth () *2/10?
               (Image.getwidth () *2/10): Logo.getwidth (NULL); int Heightlogo = Logo.getheight (null) >image.getheight () *2/10?

                (Image.getheight () *2/10): Logo.getwidth (NULL);
               /** * logo is placed in center * * * int x = (Image.getwidth ()-Widthlogo)/2;
               int y = (image.getheight ()-Heightlogo)/2;
               Gs.drawimage (logo, x, y, Widthlogo, Heightlogo, NULL);
               Gs.dispose ();

               Image.flush ();
               Generate a two-dimensional code qrcode picture File Imgfile = new file (Imgpath); ImageiO.write (Image, "png", imgfile);
               catch (Exception e) {logger.error ("Generate two-dimensional code picture exception:" + E);
           return-100;
       return 0; /** * * Generate two-dimensional code picture (without logo)-Output to stream * * @param content two-dimensional code picture contents * @param wi DTH two-dimensional code picture of the width * @param height two-dimensional code picture High * @param os two-dimensional code output stream * @author Leo * @since 3.4.0_2016 year
            June 29 */public static void Encoderqrcoder (String content, int width, int height, outputstream os) {
                try {QRCode handler = new QRCode ();
                Set up the error-correcting ability of the two-dimensional code//l 7% m 15% Q 25% H 30% handler.setqrcodeerrorcorrect (' M ');
                Storage of Handler.setqrcodeencodemode (' B ') in binary form;

                Set up a two-dimensional code version of 1=21*21 2=25*25 handler.setqrcodeversion (7);
                byte[] Contentbytes = content.getbytes ("UTF-8"); Byte[] Contentbytes = new String (content.getbytes ("iso-8859-1"), "UTF-8"). GetBytes ();; 
                Create a buffer for image data (create a sheet of paper) BufferedImage bufimg = new BufferedImage (width, height, bufferedimage.type_int_rgb);
                Create a pen graphics2d GS = Bufimg.creategraphics ();
                Set the background color to white gs.setbackground (color.white);

                Fill the paper up gs.clearrect (0, 0, width, height);

                Set Image color: Black Gs.setcolor (Color.Black);
                Set offset not set Ken can cause parse error int pixoff = 2; Output: Two-dimensional code if (Contentbytes.length > 0 && contentbytes.length < 124) {Bo
                    olean[][] Codeout = Handler.calqrcode (contentbytes);
                            for (int i = 0; i < codeout.length. i++) {for (int j = 0; J < Codeout.length; J +) { if (Codeout[j][i]) {//drawing from a Boolean arrayThe two-dimensional code rectangle diagram Gs.fillrect (J * 3 + Pixoff, I * 3 + pixoff,3, 3);  else {logger.info ("QRCode content

                Bytes length = "+ Contentbytes.length +" not in [0,125]. ");}
                Gs.dispose ();

                Bufimg.flush ();

            Generate two-dimensional Code qrcode picture Imageio.write (bufimg, "PNG", OS);
            catch (Exception e) {logger.error ("Generate two-dimensional code picture exception:" + E); /** * * Generate two-dimensional code picture (without logo)--output to file--add Redis * * @param content two-dimensional code map 
        The content of the film * @param width two-dimensional code picture of the width * @param height two-dimensional code picture of the high * @param key logo redis key * @author Leo * @since 3.4.0_2016 Year June 29/* public static string Get2coderinfile (String content, int width, int h
           Eight, string key) {string imgpath = ""; Try {QRCode handler = new QRCode ();
               Set up the error-correcting ability of the two-dimensional code//l 7% m 15% Q 25% H 30% handler.setqrcodeerrorcorrect (' M ');
               Storage of Handler.setqrcodeencodemode (' B ') in binary form;

               Set up a two-dimensional code version of 1=21*21 2=25*25 handler.setqrcodeversion (7);
               byte[] Contentbytes = content.getbytes ("UTF-8");
               byte[] contentbytes = new String (content.getbytes ("iso-8859-1"), "UTF-8"). GetBytes ();;
               Create a buffer for image data (create a sheet of paper) BufferedImage bufimg = new BufferedImage (width, height, bufferedimage.type_int_rgb);
               Create a pen graphics2d GS = Bufimg.creategraphics ();
               Set the background color to white gs.setbackground (color.white);

               Fill the paper up gs.clearrect (0, 0, width, height);

               Set Image color: Black Gs.setcolor (Color.Black); Set offset not set Ken can cause parse error int pixoff =2; Output: Two-dimensional code if (Contentbytes.length > 0 && contentbytes.length < 124) {bool
                   ean[][] Codeout = Handler.calqrcode (contentbytes);
                           for (int i = 0; i < codeout.length. i++) {for (int j = 0; J < Codeout.length; J +) { if (Codeout[j][i]) {//two-dimensional code rectangle drawing based on a Boolean array gs.f
                           Illrect (J * 3 + Pixoff, I * 3 + pixoff,3, 3); else {logger.info ("QRCode content Byt)}}}}

               Es length = "+ Contentbytes.length +" not in [0,125]. ");}
               Gs.dispose ();

                Bufimg.flush ();
                String Savepath = Imagesavepath;
                String visitwebroot = Imagevisitpath;
                Logger.debug ("Savepath:" + Savepath); Logger.debug ("Visitwebroot:" + visitWebroot);
                String osname = System.getproperties (). GetProperty ("Os.name");
                String ContextPath = "/ydmb-external";
                Logger.debug ("Osname:" + osname); if (Osname.startswith ("window") | | osname.startswith ("window")) {Savepath = Pjectpathutil.getabsolute
                    Path ();
                Visitwebroot = ContextPath;
                } logger.debug ("Savepath:" + Savepath);
                String relativepath = "/twocodefile/";
                Savepath = Savepath + relativepath;
                Logger.debug ("Savepath:" + Savepath);
                File File = new file (Savepath);
                if (!file.exists ()) {file.mkdirs ();
                } file.setexecutable (True,false);

                File.setreadable (True,false); String imagetemp = key + ". jpg"; FileName String imagename = relativepath + imagetemp;
Relative folder access name when HTTP access--to access                String ImagePath = Savepath + imagetemp;
                Relative to the server's filename path-to the server used Logger.debug ("imagename:" + imagename);

               Logger.debug ("ImagePath:" + ImagePath);
               Generate a two-dimensional code qrcode picture File Imgfile = new file (ImagePath);
               Imgfile.setexecutable (True,false);

               Imgfile.setreadable (True,false);

               Imageio.write (bufimg, "PNG", imgfile);
               Imgpath = Visitwebroot + imagename;
               Logger.debug ("Imgpath:" + Imgpath);

           Manager.setcacheobject (Two_code_img_key_name + KEY, Imgpath, datatype.string, 3 * 30 * 24 * 60 * 60);
           catch (Exception e) {logger.error ("Generate two-dimensional code picture exception:" + E);
       return imgpath;
 }

}

Pjectpathutil Code:

Package com.leo.common.platform;

Import Java.net.URL;

Import Com.leo.common.platform.config.ConfigResource; /** * Get the project root path * @author Leo * */public class Pjectpathutil {private static ClassLoader ClassLoader = Pjectpathu

    Til.class.getClassLoader ();  public static String Getclasspath () {URL url = classloader.getresource ("/");   WebLogic environment if (url = = null) {URL = Classloader.getresource ("");
    Tomcat Environment} return Url.getpath (); /** * Get Webroot Path/public static string GetAbsolutePath () {String classPath = Getclasspath
        ();
        int index = Classpath.indexof ("/web-inf");
        String path = "";
            if (index = = 1) {//jetty does not have this path index = Classpath.indexof ("/target");
            if (index = = 1) {path = Configresource.getconfig (). GetProperty ("Project.path"); else {path = classpath.substring (0, index) + "/src/main/webapp";
            } else {path = classpath.substring (0, index);
    return path;
    public static void Main (string[] args) {System.out.println (Pjectpathutil.getabsolutepath ());
 }

}

The

Configresource code is as follows:

Package com.leo.common.platform.config;
Import java.util.ArrayList;
Import java.util.List;
Import Java.util.Map;

Import java.util.Properties;

Import Org.apache.log4j.Logger;
Import Com.leo.common.db.DBUtil;

Import Com.leo.common.platform.PlatformSQL; 
 /** * <pre> * Title:ConfigResource.java * Description: Reading public configuration files (config.properties) * Project:leo Project * Copyright:leo.com Copyright (c) 2013 * Company: * </pre> * * @author Leo * @version 2.0 * @date 201

    3-5-2 */public class Configresource {private static Logger log = Logger.getlogger (Configresource.class);

    Private volatile static Properties prop; Private Configresource () {} public static Properties GetConfig () {try {if (prop = null) {synchronized (Configresource.class) {if (prop = null) {Li
st<map<string, object>> list = new arraylist<map<string, object>> ();                        List = Dbutil.gettemplate (). queryForList (Platformsql.all_config);
                        Prop = new Properties ();  For (map<string, object> map:list) {if (Map.get ("key") = = NULL | | map.get ("value") = =
                            NULL) {continue;
                        Prop.put (Map.get ("key"). ToString (), Map.get ("value"). ToString ());
            catch (Exception ex) {log.error (ex);
        Prop = new Properties ();
    return prop;
 }
}