Using Java to generate a two-dimensional code _java with text

Introduced

The main use of the Goole zxing package, the following given the sample code, very convenient for everyone's understanding and learning, the code is a preliminary framework, the function has to be based on the actual use of perfect optimization.

First step, MAVEN import zxing

<dependency>
 <groupId>com.google.zxing</groupId>
 <artifactid>core</ artifactid>
 <version>3.2.1</version>
</dependency>

Step two, start generating two-dimensional code:

private static final int black = 0xff000000;
private static final int white = 0xFFFFFFFF; /** * Deposit The generated two-dimensional code into the picture * @param Matrix zxing Package of two-dimensional code class * @return/public static bufferedimage tobufferedimage (Bitmatrix ma
 Trix) {int width = matrix.getwidth ();
 int height = matrix.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, Matrix.get (x, y)?
  Black:white);
} return image; /** * Generate two-dimensional code and write to file * @param content Scan two-dimensional code contents * @param format picture format jpg * @param file * @throws Exception/Publi c static void WriteToFile (string content, string format, file file) throws Exception {Multiformatwriter Multiformatwri
 ter = new Multiformatwriter ();
 @SuppressWarnings ("Rawtypes") Map hints = new HashMap ();
 Set UTF-8 to prevent Chinese garbled hints.put (encodehinttype.character_set, "UTF-8");
 Set the size of the white area around the two-dimensional code hints.put (encodehinttype.margin,1); To set the fault tolerance of two dimensional codes
 Hints.put (Encodehinttype.error_correction, ErrorCorrectionLevel.H);
 Draw two-dimensional code Bitmatrix Bitmatrix = Multiformatwriter.encode (content, Barcodeformat.qr_code, WIDTH, HEIGHT, hints);
 BufferedImage image = Tobufferedimage (Bitmatrix); if (! Imageio.write (image, format, file)) {throw new IOException ("Could not write a image of format" + format + "to" + fi
 Le); }
}

Third step, writing text to two-dimensional code picture:

/** * to the two-dimensional code picture plus text * @param presstext text * @param qrfile two-dimensional code file * @param fontstyle * @param color * @param fontsize */public static void Presstext (String presstext, File qrfile, int fontstyle, color color, int fontsize) throws Exception
 {presstext = new String (Presstext.getbytes (), "utf-8");
 Image src = imageio.read (qrfile);
 int imagew = Src.getwidth (null);
 int imageh = Src.getheight (null);
 BufferedImage image = New BufferedImage (Imagew, Imageh, Bufferedimage.type_int_rgb);
 Graphics g = image.creategraphics ();
 G.drawimage (SRC, 0, 0, Imagew, imageh, NULL);
 Sets the color g.setcolor the brush;
 To set fonts font font = new Font ("XXFarEastFont-Arial", FontStyle, FontSize);
 FontMetrics metrics = g.getfontmetrics (font);
 Text in the coordinates of the picture is set here in the middle int startx = (width-metrics.stringwidth (presstext))/2;
 int starty = HEIGHT/2;
 G.setfont (font);
 g.DrawString (Presstext, StartX, starty);
 G.dispose ();
 FileOutputStream out = new FileOutputStream (qrfile);
 Imageio.write (Image, "JPEG", out);
 Out.close (); SysTem.out.println ("Image press success"); }

The fourth step, in the Main method test, a middle with text two-dimensional code is generated

public static void Main (string[] args) throws Exception {
 file Qrcfile = new file ("/users/deweixu/", "google.jpg"); 
   writetofile ("www.google.com.hk", "jpg", qrcfile);
 Presstext ("Google", Qrcfile, 5, color.red,);

Summarize

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