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package com.idate.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
* @author lqinglong@yahoo.cn
* Ô¼»á360 www.yuehui360.com
*/
public class CodeHelper {

private static final CodeHelper generator = new CodeHelper();

private final String ATTRIBUTE_NAME = "code";
//ͼƬµÄ¿í¶È
private final int WIDTH = 35;
//ͼƬµÄ¸ß¶È
private final int HEIGHT = 55;
//×Ö·û´®³¤¶È
private final int CODE_LENGTH = 4;
//Ëæ»ú×Ö·û´®·¶Î§
private final String RAND_RANGE = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890" ;

private final char[] CHARS = RAND_RANGE.toCharArray();

private Random random = new Random();

private CodeHelper(){
//
}

public static CodeHelper getInstance(){
return generator;
}

/**
* Éú³ÉËæ»ú×Ö·û´®
* @return Ëæ»ú×Ö·û´®
*/
private String getRandString(){
StringBuilder sb = new StringBuilder();
for (int i = 0; i < CODE_LENGTH; i++)
sb.append(CHARS[random.nextInt(CHARS.length)]);
return sb.toString();
}


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