获取随机验证码

package com.ValidateCode;

import org.apache.commons.codec.binary.Base64;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

public class ValidateCode {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 27;
// 验证码字符个数
private int codeCount = 5;
// 验证码干扰线数
private int lineCount = 30;
// 验证码
private String code = null;
// 验证码图片Buffer
private BufferedImage buffImg=null;

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;
}
/**
 *
 * @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;
}
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
    Font font = new Font("黑体" , Font.BOLD , 24) ;
    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.setColor(new Color(0, 0, 0));
        g.drawString(strRand, (i + 1) * x, codeY);
        // 将产生的四个随机数组合在一起。
        randomCode.append(strRand);
    }
    g.dispose() ;
    // 将四位数字的验证码保存到Session中。
    code=randomCode.toString();
}
public String createCalCode() {
    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
    Font font = new Font("黑体" , Font.BOLD , 24) ;
    g.setFont(font);
    int a=random.nextInt(10);
    g.setColor(new Color(0, 0, 0));
    g.drawString(a+"", 1 * x, codeY);
    g.setColor(new Color(0, 0, 0));
    g.drawString("+", 2 * x, codeY);
    int b=random.nextInt(10);
    g.setColor(new Color(0, 0, 0));
    g.drawString(b+"", 3 * x, codeY);
    g.setColor(new Color(0, 0, 0));
    g.drawString("=", 4 * x, codeY);
    g.setColor(new Color(0, 0, 0));
    g.drawString("?", 5 * x, codeY);
    String result=String.valueOf(a+b);
    g.dispose() ;
    // 将四位数字的验证码保存到Session中。
    return result;
}

public BufferedImage getBuffImg() {
    return buffImg;
}

public String getCode() {
    return code;
}

public byte[] getByte() throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ImageIO.write(buffImg, "jpg", out);
    return out.toByteArray();
}

public String getBase64() throws IOException {
    byte[] bytes = getByte();
    return Base64.encodeBase64String(bytes);
}

public static void main(String[] args) throws  IOException{
    ValidateCode idCode = new ValidateCode();
    System.out.println(idCode.getCode());
    System.out.println(idCode.getCode().toLowerCase());
    FileOutputStream out = new FileOutputStream(new File("E:\\2345下载\\ValidateCode.jpg"));
    ImageIO.write(idCode.getBuffImg(),"JPG",out);
}

}