src/main/java/com/sojson/common/utils/vcode/GifCaptcha.java

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package com.sojson.common.utils.vcode;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
/**
 * <p>Gif验证码类</p>
 *
 * @author: wuhongjun
 * @version:1.0
 */
public class GifCaptcha extends Captcha
{
    public GifCaptcha()
    {
    }

    public GifCaptcha(int width,int height){
        this.width = width;
        this.height = height;
    }

    public GifCaptcha(int width,int height,int len){
        this(width,height);
        this.len = len;
    }

    public GifCaptcha(int width,int height,int len,Font font)
    {
        this(width,height,len);
        this.font = font;
    }

    @Override
    public void out(OutputStream os)
    {
        try
        {
            GifEncoder gifEncoder = new GifEncoder();   // gif编码类，这个利用了洋人写的编码类，所有类都在附件中
            //生成字符
            gifEncoder.start(os);
            gifEncoder.setQuality(180);
            gifEncoder.setDelay(100);
            gifEncoder.setRepeat(0);
            BufferedImage frame;
            char[] rands =alphas();
            Color fontcolor[]=new Color[len];
            for(int i=0;i<len;i++)
            {
                fontcolor[i]=new Color(20 + num(110), 20 + num(110), 20 + num(110));
            }
            for(int i=0;i<len;i++)
            {
                frame=graphicsImage(fontcolor, rands, i);
                gifEncoder.addFrame(frame);
                frame.flush();
            }