JSP random verification picture How to make _jsp programming

Small series of an article on The imitation of Tencent random verification pictures. Let's go directly to the code below! A Java class and a JSP page.

Java Class Code:

The following is a JSP imitate Tencent random validation picture quote fragment:

Package icewee.image;
Import Java.awt.BasicStroke;
Import Java.awt.Color;
Import Java.awt.Font;
Import Java.awt.Graphics2D;
Import java.awt.RenderingHints;
Import Java.awt.geom.Line2D;
Import Java.awt.image.BufferedImage;

Import Java.util.Random;
  public class Tokenutil {private static final String base = "23456789ABCDEFGHJKLMNPQRSTUVWXYZABCDEFHIJKLMNPQRSTUVWXYZ";

  private static final int length = Base.length (); public static bufferedimage createtokenimage (int width, int height, String randomcode) {BufferedImage image = N
    EW bufferedimage (width, height, bufferedimage.type_int_rgb);
    Graphics2D g = image.creategraphics ();
    Random Random = new Random (); G.setcolor (New Color (230, 230, 250)); Set background color g.fillrect (0, 0, width, height);
    Fill background g.setcolor (color.black);
    Draw Edge G.drawrect ( -1,-1, Width + 1, height + 1);
    G.setcolor (Color.gray);
  Sets the font, randomly selects the font, tentatively sets 8 fonts font font = new Font (new string[] {"Arial", "Arial Black",      "Arial Italic", "Courier new", "Courier new Bold Italic", "Courier New Italic", "Franklin Gothic Medium",
    "Franklin Gothic Medium Italic"}) [Random.nextint (8)], Font.plain, 30);
    G.setstroke (new Basicstroke (float) (Math.random ()),//Basicstroke.cap_butt, basicstroke.join_bevel));
    G.setfont (font);
    Define font Color range int red = random.nextint (160), green = random.nextint, blue = random. Nextint (50);
    Defines a disturbance-free line interval and a starting position of int nor = Random.nextint (m), Rsta = Random.nextint (131); Draw interference sine wave M: curve flatness, d:y axis constant V:X axis focal length int M = Random.nextint + 5, D = Random.nextint (%) +, V = random. NE
    Xtint (5) + 1;
    Double x = 0.0;
    Double y = M * Math.sin (Math.toradians (V * x)) + D;
    Double px, py;
      for (int i = 0; i < 131 i++) {px = x + 1;
      PY = M * Math.sin (Math.toradians (V * px)) + D;
      if (Rsta < i && i < (RSTA + NOR)) G.setcolor (new Color (230, 230, 250)); Else
        G.setcolor (New Color (red, green, blue));
      Randomly set pixel point broadband (line width) g.setstroke (new Basicstroke (float) (Math.random () + 1.5f));
      G.draw (New line2d.double (x, y, px, py));
      x = px;
    y = py;
    } char[] codes = Randomcode.tochararray ();
      for (int i = 0; i < codes.length i++) {//rotate graphics int degree = (Random.nextint (20)-10)% 360; Double ang = degree * 0.0174532925;
      Convert Angle to Radian g.rotate (Ang, WIDTH/2, HEIGHT/2);
      G.setcolor (New Color (red, green, blue));
      G.setrenderinghint (renderinghints.key_antialiasing, renderinghints.value_antialias_on);
      int gr = Random.nextint (8);
    g.DrawString (String.valueof (codes[i]), * i + + GR, 38);
    } g.dispose ();
  return image; public static String createrandomcode (int size, int width, int height) {StringBuffer Randomcode = new Stringbuff
    ER ();
      for (int i = 0; i < size; i++) {Random Random = new Random (); int start = RandOm.nextint (length);
      String Strrand = base.substring (Start, start + 1);
    Randomcode.append (Strrand);
  return randomcode.tostring ();
 }
}

JSP page:

The following is a JSP imitate Tencent random validation picture code quote fragment:

<%@ page contenttype= "image/jpeg" pageencoding= "GBK"%> <%@
page import= "java.awt.image.BufferedImage"% >
<% @page import= "Javax.imageio.ImageIO"%>
<%@ page import= "Com.icesoft.image.TokenUtil"%>

<%
  //Settings page does not cache
  Response.setheader ("Pragma", "No-cache");
  Response.setheader ("Cache-control", "No-cache");
  Response.setdateheader ("Expires", 0);
  int width =, height = m;
  String Randomcode = Tokenutil.createrandomcode (4, width, height);
  System.out.println ("Generated random code:" + randomcode);
  BufferedImage image = Tokenutil.createtokenimage (width, height, randomcode);
  Imageio.write (Image, "JPEG", Response.getoutputstream ());
  Response.flushbuffer ();
  Out.clear ();
  out = Pagecontext.pushbody ();
%>

The above is JSP imitate Tencent random verification picture all code, hope to everybody's study help.