CustomBackgroundFactory.java

package com.lst.lc.web.service;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;

import com.github.bingoohuang.patchca.background.BackgroundFactory;

public class CustomBackgroundFactory implements BackgroundFactory {
	private Random random = new Random();  
	  
    public void fillBackground(BufferedImage image) {  
        Graphics graphics = image.getGraphics();  
        // 验证码图片的宽高  
        int imgWidth = image.getWidth();  
        int imgHeight = image.getHeight();  
        // 填充为白色背景  
        graphics.setColor(Color.WHITE);  
        graphics.fillRect(0, 0, imgWidth, imgHeight);  
        // 画100个噪点(颜色及位置随机)  
        for(int i = 0; i < 100; i++) {  
            // 随机颜色  
            int rInt = random.nextInt(255);  
            int gInt = random.nextInt(255);  
            int bInt = random.nextInt(255);  
            graphics.setColor(new Color(rInt, gInt, bInt));  
            // 随机位置  
            int xInt = random.nextInt(imgWidth - 3);  
            int yInt = random.nextInt(imgHeight - 2);  
            // 随机旋转角度  
            int sAngleInt = random.nextInt(360);  
            int eAngleInt = random.nextInt(360);  
            // 随机大小  
            int wInt = random.nextInt(6);  
            int hInt = random.nextInt(6);  
            graphics.fillArc(xInt, yInt, wInt, hInt, sAngleInt, eAngleInt);  
            // 画5条干扰线  
            if (i % 20 == 0) {  
                int xInt2 = random.nextInt(imgWidth);  
                int yInt2 = random.nextInt(imgHeight);  
                graphics.drawLine(xInt, yInt, xInt2, yInt2);  
            }  
        }  
    }  
}