java验证码

来源：互联网发布：sql查询学生成绩编辑：程序博客网时间：2024/06/03 13:06

////java验证码实现

package cn;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;

import javax.imageio.ImageIO;

public class verigyCode {

   private int w=70;
   private int h=35;
   private Random r=new Random();
   //可选字体
   private String[] fontNames={"宋体","华文楷体","黑体","华文新魏","华文隶书","微软雅黑","楷体_GB2312"};
   //可选字符
   private String codes="23456789abcdefghjkmnpqrstuvwxyzABCDEFGHIGKLMNPQURSTUVWXYZ";
   //背景色
   private Color bgColor=new Color(255, 255, 255);
   //验证码上面的文本
   private String text;

   //生成随机的颜色
   private Color randomColor(){
       int red =r.nextInt(150);
       int green=r.nextInt(150);
       int blue=r.nextInt(150);
       return new Color(red, green, blue);
   }
   //生成随机字体

   private Font randomFont(){
       int index =r.nextInt(fontNames.length);
       String fontName=fontNames[index];//生成随机的字体名称
       int style=r.nextInt(4);//生成随机的样式，0（无样式），1（粗体），2（斜体），3,（粗体加斜体）
       int size =r.nextInt(5)+24;//生成随机字号
       return new Font(fontName, style, size);

   }
   //

   //画干扰线
   private void drawLine (BufferedImage image){
       int num=3;//一共画三条
       Graphics2D g2=(Graphics2D)image.getGraphics();//得到画笔
       for(int i=0;i<num;i++){//生成两个点的坐标即4个值
           int x1=r.nextInt(w);
           int y1=r.nextInt(h);
           int x2=r.nextInt(w);
           int y2=r.nextInt(h);
           g2.setStroke(new BasicStroke(1.5f));//定义干扰线的形状
           g2.setColor(Color.BLUE);//干扰线是蓝色
           g2.drawLine(x1, y1, x2, y2);//画线
       }
   }

   //随机生成一个字符
   private char randomChar(){
       int index=r.nextInt(codes.length());
       return codes.charAt(index);
   }

   //创建BufferedImage
   private BufferedImage createImage(){
       BufferedImage image=new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
       Graphics2D g2= (Graphics2D) image.getGraphics();
       g2.setColor(bgColor);
       g2.fillRect(0, 0, w, h);//填充
       return image;
   }

   //调用这个方法得到验证码
   public BufferedImage getImage(){
       BufferedImage imag=createImage();//创建图片缓冲区
       Graphics2D g2=(Graphics2D) imag.getGraphics();//得到绘制环境
       StringBuffer sb=new StringBuffer();//用来装载生成的验证码
       //向图片中画4个字符
       for(int i=0;i<4;i++){//循环4次，每次生成一个字符
           String s=randomChar()+"";//随机生成一个字母
           sb.append(s);//把字母添加到sb当中
           float x=i*1.0f*w/4;//设置当前字符的x轴坐标
           g2.setFont(randomFont());//设置随机字体
           g2.setColor(randomColor());//设置随机颜色
           g2.drawString(s, x, h-4);//画图

       }
       this.text=sb.toString();//把生成的字符串赋给了this.text
       drawLine(imag);//添加干扰线
       return imag;
   }

   //返回验证码图片上的文本
   public String getText(){
       return text;
   }

   //保存图片到指定的输出流
   public static void output(BufferedImage imag ,OutputStream out)throws IOException{
       ImageIO.write(imag,"JPEG",out);

   }
   public void fun2() throws FileNotFoundException, IOException {
       verigyCode vc = new verigyCode();
       BufferedImage bi = vc.getImage();
       verigyCode.output(bi, new FileOutputStream("F:/xxx.jpg"));

       System.out.println(vc.getText());
   }

}

////

package cn;

import java.io.FileNotFoundException;
import java.io.IOException;

public class text {
   public static void main(String[] args) throws FileNotFoundException, IOException{
       verigyCode t1=new verigyCode();
       t1.fun2();
   }
}

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