使用JAVA生成四位随机验证码图片

最新推荐文章于 2024-01-15 00:30:07 发布

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最新推荐文章于 2024-01-15 00:30:07 发布

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//转自： http://blog.sina.com.cn/s/blog_4ffb0acd0100ypk6.html

package cn.itcast.web.response;

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

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//生成验证码图片
public class Demo1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
  int WIDTH = 100;
  int HIGHT = 30;
  //在内在中创建一幅图片
  BufferedImage image = new BufferedImage(WIDTH,HIGHT,BufferedImage.TYPE_INT_RGB);
  //取得一个画笔
  Graphics g = image.getGraphics();
  //设置字符串格式
  g.setFont(new Font("黑体",Font.BOLD,24));
  //画干扰线
  for(int i=0;i<7;i++){
   Random r = new Random();
   int x1 = r.nextInt(WIDTH);
   int x2 = r.nextInt(WIDTH);
   int y1 = r.nextInt(HIGHT);
   int y2 = r.nextInt(HIGHT);
   Color color = new Color(
             (new Double(Math.random() * 128)).intValue() + 128,
             (new Double(Math.random() * 128)).intValue() + 128,
             (new Double(Math.random() * 128)).intValue() + 128);
   g.setColor(color);
   g.drawLine(x1, y1, x2, y2);
  }
  //得到一个随机颜色
  Color color = new Color(
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128);
  g.setColor(color);
  //画字符串
  g.drawString(getVaule(), WIDTH/5, 2*HIGHT/3);

  //blog.sina.com.cn/flyzhouw
  Color color1 = new Color(
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128);
  g.setColor(color1);
  g.drawString(getChar(), WIDTH/3, 2*HIGHT/3);
  Color color2 = new Color(
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128);
  g.setColor(color2);
  g.drawString(getVaule(), WIDTH/2, 2*HIGHT/3);
  Color color3 = new Color(
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128,
            (new Double(Math.random() * 128)).intValue() + 128);
  g.setColor(color3);
  g.drawString(getChar(), 2*WIDTH/3, 2*HIGHT/3);
  //将内存中的图片，输出浏览器
  ImageIO.write(image, "JPG", response.getOutputStream());
}
private String getVaule() {
  Random r = new Random();
  int num = r.nextInt(10);
  return num + "";
}
private String getChar()
  {
      Random random =new Random();
      int r = 0 ;
      while(true)
      {
         r = random.nextInt(57) + 65;
         if(r>90&&r<97||r==0)continue;
         break;
       }
      char a = (char)r;
      return a + "";
    }
}