java 验证码生成

public static void main(String[] args) {

        String path = "d:/t/test.jsp";

        ValidateCode vCode = new ValidateCode(120, 40, 5, 100);
        try {
            System.out.println(vCode.getCode() + " >" + path);
            vCode.write(path);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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

import javax.imageio.ImageIO;
import javax.servlet.ServletException;

import com.sun.xml.internal.ws.util.ByteArrayBuffer;
/**
 * 验证码生成器
 * @author dsna
 *
 */
public class ValidateCode {

    // 图片的宽度。
    private int width = 160;
    // 图片的高度。
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 5;
    // 验证码干扰线数
    private int lineCount = 150;
    // 验证码
    private String code;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;

    private ByteArrayBuffer byteImge;

    private int x = 0;
    private int codeY;
    private String fontStyle;
    private int fontHeight;

    private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
            'K', 'L', 'M', 'N',  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
            'X', 'Y', 'Z',  '1', '2', '3', '4', '5', '6', '7', '8', '9' };

    public  ValidateCode() {
        this.createCode();
    }

    /**
     * 
     * @param width 图片宽
     * @param height 图片高
     */
    public  ValidateCode(int width,int height) {
        this.width=width;
        this.height=height;
        this.createCode();
    }
    /**
     * 
     * @param width 图片宽
     * @param height 图片高
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public  ValidateCode(int width,int height,int codeCount,int lineCount) {

        this.width=width;
        this.height=height;
        this.codeCount=codeCount;
        this.lineCount=lineCount;

        x = width / (codeCount + 1);
        fontHeight = height - 2;
        codeY = height - 12;
        this.createCode();
    }

    public void createCode() {
        int x = 0,fontHeight=0,codeY=0;
        int red = 0, green = 0, blue = 0;

        x = width / (codeCount +2);//每个字符的宽度
        fontHeight = height - 2;//字体的高度
        codeY = height - 4;

        // 图像buffer
        buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        // 生成随机数
        Random random = new Random();
        // 将图像填充为白色
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        // 创建字体
        ImgFontByte imgFont=new ImgFontByte();
        Font font =imgFont.getFont(fontHeight);
        g.setFont(font);

        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs+random.nextInt(width/8);
            int ye = ys+random.nextInt(height/8);
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawLine(xs, ys, xe, ye);
        }

        // randomCode记录随机产生的验证码
        StringBuffer randomCode = new StringBuffer();
        // 随机产生codeCount个字符的验证码。
        for (int i = 0; i < codeCount; i++) {
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
            // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            g.setColor(new Color(red, green, blue));
            g.drawString(strRand, (i + 1) * x, codeY);
            // 将产生的四个随机数组合在一起。
            randomCode.append(strRand);
        }
        // 将四位数字的验证码保存到Session中。
        code=randomCode.toString();     

    }

    /**
     * 
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
//  protected void createCode() {
//      
//
//      // 在内存中创建图象
//      buffImg = new BufferedImage(width, height,
//              BufferedImage.TYPE_INT_RGB);
//
//      // 获取图形上下文
//      Graphics2D g = buffImg.createGraphics();
//
//      // 生成随机类
//      Random random = new Random();
//
//      // 设定背景色
//      g.setColor(Color.WHITE);
//      
//      g.fillRect(0, 0, width, height);
//
//      // 设定字体
//      g.setFont(new Font(fontStyle, Font.PLAIN + Font.ITALIC, fontHeight));
//
//      // 画边框
//      g.setColor(new Color(55, 55, 12));
//      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 < 160; 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);
//      }
//
//      // 取随机产生的认证码(4位数字)
//      int red = 0, green = 0, blue = 0;
//      for (int i = 0; i < codeCount; i++) {
//          red = random.nextInt(255);
//          green = random.nextInt(255);
//          blue = random.nextInt(255);
//          int wordType = random.nextInt(3);
//          char retWord = 0;
//          switch (wordType) {
//          case 0:
//              retWord = this.getSingleNumberChar();
//              break;
//          case 1:
//              retWord = this.getLowerOrUpperChar(0);
//              break;
//          case 2:
//              retWord = this.getLowerOrUpperChar(1);
//              break;
//          }
//          code += String.valueOf(retWord);
//          g.setColor(new Color(red, green, blue));
//          g.drawString(String.valueOf(retWord), (i) * x, codeY);
//
//      }
//      // 将认证码存入SESSION
//      
//      // 图象生效
//      g.dispose();
//  }

    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 void write(String path) throws IOException {
        OutputStream sos = new FileOutputStream(path);
            this.write(sos);
    }

    public void write(OutputStream sos) throws IOException {
            ImageIO.write(buffImg, "png", sos);
            sos.close();
    }
    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code;
    }

    private char getSingleNumberChar() {
        Random random = new Random();
        int numberResult = random.nextInt(10);
        int ret = numberResult + 48;
        return (char) ret;
    }

    private char getLowerOrUpperChar(int upper) {
        Random random = new Random();
        int numberResult = random.nextInt(26);
        int ret = 0;
        if (upper == 0) {// 小写
            ret = numberResult + 97;
        } else if (upper == 1) {// 大写
            ret = numberResult + 65;
        }
        return (char) ret;
    }
}

java 验证码生成

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