生成图片验证码

直接上代码

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;
 
 
/**
 * 验证码工具类
 * @author <a href="http://www.xdemo.org/">http://www.xdemo.org/</a>
 * 252878950@qq.com
 */
public class CaptchaUtils {
     
    /**
     * 验证码复杂程序 ComplexLevel.SIMPLE简单 ComplexLevel.MEDIUM中等 ComplexLevel.HARD复杂
     * @作者 Goofy
     * @邮件 252878950@qq.com
     * @日期 2014-3-10下午3:49:11
     * @描述 复杂等级
     */
    public enum ComplexLevel {SIMPLE,MEDIUM,HARD}
     
    private static final char []SIMPLE={'0','1','2','3','4','5','6','7','8','9'};
    private static final char []MEDIUM={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','Z','Y','Z'};
    private static final char []HARD={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','Z','Y','Z'};
     
    private static Random random = new Random();
     
    /**
     * 验证码生产类<br>
     * 简单的验证码由4位数字组成<br>
     * 中等复杂的验证码有5位，字母（包括大小写）和数字组成，有干扰点<br>
     * 最复杂的验证码由6位字母（包括大小写）和数字组成，有干扰点和干扰线<br>
     * 可自定义干扰点和干扰线的数量
     * @param width 验证码图片宽度
     * @param height 验证码图片高度
     * @param fontSize 字体大小
     * @param lineCount 干扰线条数 仅对复杂验证码模式有效
     * @param pointCount 干扰点 对复杂验证码和中等复杂度验证码有效
     * @param colours 是否彩色字体
     * @param border 是否绘制边框
     * @param complexLevel 复杂度枚举类型，如传入ComplexLevel.SIMPLE
     * @return Object 数组<br>
     *        Object[0]是BufferImage图像信息，可以通过ImageIO.write((BufferImage)Object[0],"JPEG",HttpResponse.getOutputStream())写到客户端<br>
     *        Object[1]第二位是验证码字符串
     */
    public static Object[] getCaptchaImage(int width,int height,int fontSize,int lineCount,int pointCount,boolean border,boolean colours,ComplexLevel complexLevel){
 
        Object[] object=new Object[2];
        //验证码字符串
        StringBuffer sb=new StringBuffer();
        //从字符数组中去字符的随机位置
        int position=0;
         
        //图像数据
        BufferedImage bi=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //获取一张图像
        Graphics grap=bi.getGraphics();
        //绘制一个矩形
        grap.fillRect(0, 0, width, height);
        //设置字体
        grap.setFont(new Font("Arial",Font.BOLD,fontSize));
        //设置字体颜色
        grap.setColor(Color.BLACK);
        //绘制一个边框
        if(border)grap.drawRect(0, 0, width-1, height-1);
        switch (complexLevel) {
            case SIMPLE:
                for(int i=0;i<4;i++){
                    //设置随机颜色
                    if(colours)grap.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
                    position=random.nextInt(SIMPLE.length);
                    //写字符到图片合适的位置
                    grap.drawString(SIMPLE[position]+"",(i*((width-10)/4))+5+random.nextInt(((width-10)/4)/2),height/2+random.nextInt(height/2));
                    sb.append(SIMPLE[position]);
                }
                break;
            case MEDIUM:
                //绘制干扰点
                for (int k = 0; k < pointCount; k++) {
                    grap.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);
                }
                for(int i=0;i<5;i++){
                    //设置随机颜色
                    if(colours)grap.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
                    position=random.nextInt(MEDIUM.length);
                    //写字符到图片合适的位置
                    grap.drawString(MEDIUM[position]+"",(i*((width-10)/5))+5+random.nextInt(((width-10)/5)/2),height/2+random.nextInt(height/2));
                    sb.append(MEDIUM[position]);
                }
                break;
            case HARD:
                //绘制干扰线
                for (int j = 0; j < lineCount; j++) {
                    grap.drawLine(random.nextInt(width), random.nextInt(height),random.nextInt(width), random.nextInt(height));
                }
                //绘制干扰点
                for (int k = 0; k < pointCount; k++) {
                    grap.drawRect(random.nextInt(width), random.nextInt(height), 1, 1);
                }
                for(int i=0;i<6;i++){
                    //设置随机颜色
                    if(colours)grap.setColor(new Color(random.nextInt(255), random.nextInt(255), random.nextInt(255)));
                    position=random.nextInt(HARD.length);
                    //写字符到图片合适的位置
                    grap.drawString(HARD[position]+"",(i*((width-10)/6))+5+random.nextInt(((width-10)/6)/2),height/2+random.nextInt(height/2));
                    sb.append(HARD[position]);
                }
                break;
            default:
                break;
        }
        //释放Graphics对象
        grap.dispose();
         
        object[0]=bi;
        object[1]=sb.toString();
         
        return object;
    }
    /*测试代码*/
    public static void main(String[] args) throws IOException, InterruptedException {
        for(int i=0;i<10;i++){
            Object[] obj=getCaptchaImage(150, 50, 35, 50, 500, true,true, ComplexLevel.MEDIUM);
            System.out.println("验证码"+obj[1]);
            new File("D:\\测试").mkdir();
            ImageIO.write((BufferedImage)obj[0],"jpg",new File("D:\\测试\\"+System.currentTimeMillis()+".jpg"));
            Thread.sleep(500L);
        }
    }
}