photo.java

由java生成四位数字图片验证码的一个程序

package com;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;

public class Photo {

	public void getPhoto()
	{
	int width=60, height=20; 
	BufferedImage image = new BufferedImage(width, height, 
	BufferedImage.TYPE_INT_RGB); 


	Graphics g = image.getGraphics(); 
	 
	g.setColor(new Color(0xDCDCDC)); 
	g.fillRect(0, 0, width, height); 


	g.setColor(Color.black); 
	g.drawRect(0,0,width-1,height-1); 


	String rand =""+ (Math.random()*10000);
	rand = rand.substring(0,rand.indexOf(".")); 


	switch(rand.length()) 
	{ 
	case 1: rand = "000"+rand; break; 
	case 2: rand = "00"+rand; break; 
	case 3: rand = "0"+rand; break; 
	default: rand = rand.substring(0,4); break; 
	} 

   System.out.println(rand);
	g.setColor(Color.black); 
	Integer tempNumber = new Integer(rand); 
	String numberStr = tempNumber.toString(); 

	g.setFont(new Font("Atlantic Inline",Font.PLAIN,18)); 
	String Str = numberStr.substring(0,1); 
	g.drawString(Str,8,17); 

	Str = numberStr.substring(1,2); 
	g.drawString(Str,20,15); 
	Str = numberStr.substring(2,3); 
	g.drawString(Str,35,18); 

	Str = numberStr.substring(3,4); 
	g.drawString(Str,45,15); 


	Random random = new Random(); 
	for (int i=0;i<20;i++) 
	{ 
	int x = random.nextInt(width); 
	int y = random.nextInt(height); 
	g.drawOval(x,y,0,0); 
	} 


	g.dispose(); 


	try {
		ImageIO.write(image, "JPEG", new File(System.getProperty("user.dir")+File.separator+"com"+
				File.separator+"Image.jpeg"));
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} 
	}
	public static void main(String[] args )
	{
		new Photo().getPhoto();
	}
}