Java generated picture Verification code sample Code _java

  This example for you to share the Java Image Verification code to achieve the specific code for your reference, the specific content as follows

Import Java.awt.Color;
Import Java.awt.Font;
Import Java.awt.Graphics;
Import Java.awt.image.BufferedImage;
Import Java.io.FileOutputStream;
Import java.io.IOException;
Import Java.io.OutputStream;
Import Java.util.Random;
Import Javax.imageio.ImageIO; * * Steps: * 1. Picture frame * 2. Draw background * 3. Reprint * 4. Draw the disturbing line */public final class Imageutil {//Authentication code character set private static final ch Ar[] chars = {' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' A ', ' B ', ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' I ', ' J
  ', ' K ', ' L ', ' M ', ' N ', ' O ', ' P ', ' Q ', ' R ', ' S ', ' T ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z '};
  Character number private static final int SIZE = 4;
  Number of jamming lines private static final int LINES = 5;
  Width private static final int width = 80;
  Highly private static final int height = 40;
 
  Font size private static final int font_size = 30; /** * Generate random verification codes and pictures * Object[0] Authenticode strings String * object[1] Verify code picture bufferedimage/public static object[] Createima GE () {stringbuffer sb = new StringbuffER ();
    1. Create a blank picture bufferedimage image = New BufferedImage (WIDTH, HEIGHT, Bufferedimage.type_int_rgb);
    2. Get picture brush Graphics graphic = image.getgraphics ();
    3. Set the brush color Graphic.setcolor (color.light_gray);
    4. Draw rectangular Background graphic.fillrect (0, 0, WIDTH, HEIGHT);
    5. Draw random characters Random ran = new Random ();
      for (int i = 0; I <SIZE; i++) {//Fetch random character index int n = ran.nextint (chars.length);
      Set the random color Graphic.setcolor (Getrandomcolor ());
      Sets the font size graphic.setfont (new font (NULL, Font.Bold + font.italic, font_size));
      Reprint character Graphic.drawstring (Chars[n] + "", I * width/size, HEIGHT/2);
    Record character Sb.append (Chars[n]);
      //6. Draw interference line for (int i = 0; i < LINES i++) {//Set random color Graphic.setcolor (Getrandomcolor ()); Random Draw Line Graphic.drawline (Ran.nextint (width), ran.nextint (height), ran.nextint (width), ran.nextint (height))
    ;
}//7. Return Verification Code and picture    return new object[]{sb.tostring (), image};
    /** * Randomly take color/public static color Getrandomcolor () {Random ran = new Random ();
    Color color = new Color (ran.nextint (256), Ran.nextint (256), Ran.nextint (256));
  return color;
    public static void Main (string[] args) throws IOException {object[] Objs = CreateImage ();
    BufferedImage image = (bufferedimage) objs[1];
    Picture format can be customized, Java to PNG picture display more clearly, the output path can be customized outputstream OS = new FileOutputStream ("D:/x.png");
    Note that the picture format matches imageio.write (image, "PNG", OS) to create a format;
  Os.close (); }
 
}

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