JAVA之图片验证码的工具类

我们平时开发时经常会遇到需要图片验证码,基础的验证码包括了数字、字母、甚至可能有汉字。下面我给出一个简单的工具类。

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.Random;
import javax.imageio.ImageIO;

/**
* 验证码生成器
*/
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 static String code = null;
// 验证码图片Buffer
private BufferedImage buffImg = null;

private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R',
'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '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;
this.createCode();
}

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

x = width / (codeCount + 1);// 每个字符的宽度
fontHeight = height - 2;// 字体的高度
codeY = height - 3;

// 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();
}

public void write(String path,String fileName) throws IOException {
File folder = new File(path);
if(!folder.exists()){
folder.mkdirs();
}
OutputStream sos = new FileOutputStream(path+fileName);
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;
}

public static void main(String[] args) {
ValidateCode vCode = new ValidateCode(120,40,5,50);
try {
String path="D:\\report\\image\\code\\";
System.out.println(vCode.getCode()+" >"+path);
vCode.write(path,new Date().getTime()+".png");
} catch (IOException e) {
e.printStackTrace();
}
}

}

下面这个类主要是用作字体的设置,大家也可以直接拿过来用。

import java.awt.Font;
import java.io.ByteArrayInputStream;

public class ImgFontByte {
public Font getFont(int fontHeight){
try {
Font baseFont = Font.createFont(Font.ITALIC, new ByteArrayInputStream(hex2byte(getFontByteStr())));
return baseFont.deriveFont(Font.PLAIN, fontHeight);
} catch (Exception e) {
return new Font("Consola",Font.PLAIN, fontHeight);
}
}

private byte[] hex2byte(String str) {
if (str == null)
return null;
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1)
return null;
byte[] b = new byte[len / 2];
try {
for (int i = 0; i < str.length(); i += 2) {
b[i/2] = (byte) Integer.decode("0x" + str.substring(i, i + 2)).intValue();
}
return b;
} catch (Exception e) {
return null;
}
}

/**
* ttf字体文件的十六进制字符串
* @return
*/
private String getFontByteStr(){
return null;
}
}
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