package com.easyjf.site.business;
import java.awt.*;
import java.awt.image.*;
import java.util.*;

public class ImageCode {

public String sRand="";

public Color getRandColor(int fc,int bc){//給定范圍獲得隨機顏色
Random random = new Random();
	if(fc>255) fc=255;
	if(bc>255) bc=255;
	int r=fc+random.nextInt(bc-fc);
	int g=fc+random.nextInt(bc-fc);
	int b=fc+random.nextInt(bc-fc);
	return new Color(r,g,b);
}
public BufferedImage creatImage(){
// 在內存中創建圖象
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = image.getGraphics();
//生成隨機類
Random random = new Random();
// 設定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
//設定字體
g.setFont(new Font("Times New Roman",Font.PLAIN,18));

// 隨機產生155條干擾線，
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}
// 取隨機產生的認證碼(4位數字)
for (int i=0;i<4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
// 將認證碼顯示到圖象中
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//調用函數出來的顏色相同，可能是因為種子太接近，所以只能直接生成
g.drawString(rand,13*i+6,16);
}
// 圖象生效
g.dispose();
return image;
}

/**
 * @return Returns the sRand.
 */
public String getSRand() {
	return sRand;
}
}