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Java code
package com.dingding.web;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import javax.imageio.*;

/**
* Description:
* <br/>Copyright (C), 2001-2010, Yeeku.H.Lee
* <br/>This program is protected by copyright laws.
* <br/>Program Name:
* <br/>Date:
* @author  Yeeku.H.Lee kongyeeku@163.com
* @version  1.0
*/
public class AuthImg extends HttpServlet
{
    //¶¨ÒåͼÐÎÑéÖ¤ÂëÖлæÖÆ×Ö·ûµÄ×ÖÌå
    private final Font mFont =
        new Font("Arial Black", Font.PLAIN, 16);
    //¶¨ÒåͼÐÎÑéÖ¤ÂëµÄ´óС
    private final int IMG_WIDTH = 100;
    private final int IMG_HEIGTH = 18;
    //¶¨ÒåÒ»¸ö»ñÈ¡Ëæ»úÑÕÉ«µÄ·½·¨
    private Color getRandColor(int fc,int bc)
    {
        Random random = new Random();
        if(fc > 255) fc = 255;
        if(bc > 255) bc=255;


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