verifycode.java

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package javabean;

import java.awt.*;						//导入类
import java.awt.image.*;
import java.util.*;
import javax.imageio.*;

//定义类

public class VerifyCode {
        static Random r = new Random();
        static String ssource = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"  + "abcdefghijklmnopqrstuvwxyz" + "0123456789";
        static char[] src = ssource.toCharArray();


        //产生随机字符串

        private static String randString (int length){
                char[] buf = new char[length];
                int rnd;
                for(int i=0;i<length;i++){
                        rnd = Math.abs(r.nextInt()) % src.length;

                        buf[i] = src[rnd];
                }
                return new String(buf);
        }

        //调用该方法，产生随机字符串,
        //参数i: 为字符串的长度
        public String runVerifyCode(int i){
                String VerifyCode = randString(i);
                return VerifyCode;
        }


        //给定范围获得随机颜色
        public Color getRandColor(int fc,int bc)
        {
           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);
        }

        //调用该方法将得到的验证码生成图象
        //sCode:传递验证码 w:图象宽度 h:图象高度
        public BufferedImage CreateImage(String sCode)
        {
                try{
                        //字符的字体
                        Font CodeFont = new Font("Arial Black",Font.PLAIN,16);
                        int iLength = sCode.length();					//得到验证码长度
                        int width=22*iLength, height=20;				//图象宽度与高度
                        int CharWidth = (int)(width-24)/iLength;		//字符距左边宽度
                        int CharHeight = 16;    						//字符距上边高度

                        // 在内存中创建图象
                        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(200,240));
                        g.fillRect(0, 0, width, height);

                        //设定字体
                        g.setFont(CodeFont);

                        //画随机颜色的边框
                        g.setColor(getRandColor(10,50));
                        g.drawRect(0,0,width-1,height-1);

                        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
                        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);
                        }


                        for (int i=0;i<iLength;i++)
                        {
                                String rand = sCode.substring(i,i+1);
                                // 将认证码显示到图象中
                                g.setColor(new Color(20+random.nextInt(60),20+random.nextInt(120),20+random.nextInt(180)));
                                g.drawString(rand,CharWidth*i+14,CharHeight);
                        }
                        // 图象生效
                        g.dispose();
                        return image;
                }catch(Exception e){
                        //e.printStackTrace();
                        //System.out.println(e.getMessage());
                        }
                return null;
        }

        //测试
        public static void main(String[] args){
                        //VerifyCode vc = new VerifyCode();
                        //String s1 = vc.runVerifyCode(4);
                        //Fun.DreamNewsTitle;System.out.println(s1);
                        //Image im = vc.CreateImage(s1);
                        //Graphics g = im.getGraphics();
                        //g.drawImage(im,20,20,this);
                        //g.drawString(s1,20,20);

        }
}