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;
}
}