java图片验证代码

来源：互联网发布：三国志13自创武将数据编辑：程序博客网时间：2024/04/30 12:52

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
/**
* 产生四们随机数字的验证图片
* @author yidatuosi
*
*/
public class ImageTool
{
public String sRand = "";

public Color getRandColor(int fc, int bc)
{//给定范围获得随机颜色
  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()
{//在内存中创建图像
  int width = 60;
  int height = 20;
  BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

  //获取图形上下文
  Graphics g = image.getGraphics();

  //生成随机类
  Random random = new Random();

  //设定背景色
  g.setColor(getRandColor(200,250));
  g.fillRect(0, 0, width, height);

  //设定字体
  g.setFont(new Font("Times New Roman",Font.PLAIN,18));

  //画边框
//  g.setColor(new Color());
//  g.drawRect(0, 0, width-1, height-1);
  //随机产生155条干扰经，使图像中的认证码不易被其他程序探测到
  for(int i=0; i<155; i++)
  {
   g.setColor(getRandColor(160,200));
   int x = random.nextInt(width);
   int y = random.nextInt(height);
   int x1 = random.nextInt(12);
   int y1 = random.nextInt(12);
   g.drawLine(x, y, x+x1, y+y1);
  }

  //取随机产生的认证码（4位数字）
  sRand = "";
  for(int i=0; i<4; i++)
  {
   String rand = String .valueOf(random.nextInt(10));
   sRand+=rand;
   //将认证码显示到图像中
   g.setColor(new Color(20+random.nextInt(110), 20 + random.nextInt(110), 20+random.nextInt(110)));
   //调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
   g.drawString(rand, 13*i+6, 16);
  }

  //图像生效
  g.dispose();
  return image;
}

public String getRand()
{
  return sRand;
}

public static void main(String[] args)
{
  ImageTool it = new ImageTool();
  JFrame jf = new JFrame();
  jf.setSize(200,300);
  jf.setTitle("产生验证码");

  Container ct = jf.getContentPane();
  ImageIcon ii = new ImageIcon(it.creatImage());
  JLabel jl = new JLabel(ii);
  ct.add(jl);
  jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  jf.setVisible(true);
  System.out.println(it.getRand());
}
}