Paint color code

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For more back-end source code and paste comments

package com.controller;


import com.tools.InterLine;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

@Controller
public class GetImageCode {

    /**
     * 获取图片验证码
     */
    @RequestMapping("/getImageCode")
    @ResponseBody 
    public void getImageCode (the HttpServletRequest Request, the HttpServletResponse Response, the HttpSession the session) throws IOException { 
// System.out.println ( "Get authentication code"); 

        / ** 
         * custom drawing 
         * / 
        // image pixel width 
        int wpx = 80; 
        // high pixel 
        int HPX = 30; 

        // 1. create a transparent color without BufferedImage object, that is, the picture object 
        BufferedImage BFI = new new BufferedImage (WPX, HPX, BufferedImage.TYPE_INT_RGB); 
// painting tools, Photo Paint 
        Graphics bfi.getGraphics G = (); 
// with pre-specified color fill rectangle 
        g.fillRect (0, 0, WPX, HPX); 
// character codes range
        char [] = CH "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" .toCharArray (); 
        // a random number category 
        the Random R & lt new new = the Random (); 
        int index; 
// save the string 
        the StringBuffer the StringBuffer new new SB = (); 
        for (int I = 0; I <. 4; I ++) { 
            // int generate a random value between [0, n-) interval, i.e. int random value between 0 and n, not including 0 contains n. 
            = r.nextInt index (ch.length); 
            // set a different color for each character 
            g.setColor (new Color (r.nextInt (255 ), r.nextInt (255), r.nextInt (255))); 
            // set Font 
// Font font = new Font ( "Arial", 30, 30); 
            // italicized, bold, size 30 
            the Font = new new font the Font ( "Arial", Font.BOLD, 27); 
            G. setFont (font);
// use the pre-set font and color of text to draw str, the coordinates of the lower left corner of the text (X, Y) 
            g.drawString (CH [index] + "", (* 20 is I) + 2, 23 is); 
            / / string concatenation 
            sb.append (CH [index]); 
        } 
// System.out.println (SB); 


        // add noise, more noise, not the identification 
        // noise area, where the entire set of pictures 2 percent 
        int Area = (int) (* 0.04 * WPX HPX); 
        for (int I = 0; I <Area; I ++) { 
            // set the random noise coordinates, width and height of image pixels not exceed 
            int x = (int ) (Math.random () * WPX); 
            int Y = (int) (Math.random () * HPX); 
            // Sets a pixel BufferedImage to the specified RGB values of the colors on the screen are by a set of RGB values is recorded and expressed. 
            // mean parameters: x coordinate, y coordinate, the brightness of the RGB color values, this is not a painting, a noise image is provided
            bfi.setRGB (X, Y, (int) (Math.random () * 255)); 
        } 

// set the codes interference line 
        // number of interfering lines 
        int = COUNT. 6; 
        // call to set the RGB method 
        InterLine interLine Interline new new = (); 
        for (int I = 0; I <COUNT; I ++) { 
            // Get random disturbance start and end lines, i.e., the beginning and ending coordinates of two points 
            // start coordinates 
            int xstart = (int) (Math.random () * WPX); 
            int yStart = (int) (Math.random () * HPX); 
            // end coordinates 
            int the xend = (int) (Math.random () * WPX); 
            int 's ending = ( int) (Math.random () * HPX); 
            // set the line color 
            color color interLine.interLine = (. 1, 255); 
            g.setColor (color);
            g.drawLine (Xstart, yStart, the xend, 's ending); 
        } 
        // set the session 
        the HttpSession Request.getSession the HttpSession = (); 
        HttpSession.setAttribute ( "verificationCode", SB); 
// String String verificationCode new new = ((the StringBuffer) the session .getAttribute ( "verificationCode")); 
// System.out.println ( "output SB:" + verificationCode); 
        // output stream pictures, meaning parameters: the picture object, the picture suffix format output stream in what way transmission, if remote control programs to be transmitted websokect 
        ImageIO.write (BFI, "JPG", response.getOutputStream ()); 

    } 
}

 Another tool categories:

package com.tools;

import java.awt.*;

public class InterLine {
    public Color interLine(int Low, int High) {
        if (Low > 255)
            Low = 255;
        if (High > 255)
            High = 255;
        if (Low < 0)
            Low = 0;
        if (High < 0)
            High = 0;
        //RGB参数范围，最大范围在0~255
        int interval = High - Low;
        int r = Low + (int) (Math.random() * interval);
        int g = Low + (int) (Math.random() * interval);
        int b = Low + (int) (Math.random() * interval);
        return new Color(r, g, b);
    }
}